using System;
using System.Collections;
using System.Collections.Generic;
using System.Drawing;
using System.Globalization;
using System.IO;
using System.IO.Packaging;
using System.Linq;
using System.Security.Principal;
using System.Text.RegularExpressions;
using System.Xml.Linq;


namespace Novacode
{
    /// <summary>
    /// Represents a document paragraph.
    /// </summary>
    public class Paragraph : InsertBeforeOrAfter
    {
        internal PackagePart mainPart;
        public PackagePart PackagePart { get { return mainPart; } set { mainPart = value; } }

        // The Append family of functions use this List to apply style.
        internal List<XElement> runs;

        // This paragraphs text alignment
        private Alignment alignment;

        public ContainerType ParentContainer;

        private XElement ParagraphNumberPropertiesBacker { get; set; }
        /// <summary>
        /// Fetch the paragraph number properties for a list element.
        /// </summary>
        public XElement ParagraphNumberProperties
        {
            get
            {
              return ParagraphNumberPropertiesBacker ?? (ParagraphNumberPropertiesBacker = GetParagraphNumberProperties());
            }
        }

      private XElement GetParagraphNumberProperties()
      {
        var numPrNode = Xml.Descendants().FirstOrDefault(el => el.Name.LocalName == "numPr");
        if (numPrNode != null)
        {
          var numIdNode = numPrNode.Descendants().First(numId => numId.Name.LocalName == "numId");
          var numIdAttribute = numIdNode.Attribute(DocX.w + "val");
          if (numIdAttribute != null && numIdAttribute.Value.Equals("0"))
          {
            return null;
          }
        }

        return numPrNode;
      }

        private bool? IsListItemBacker { get; set; }
        /// <summary>
        /// Determine if this paragraph is a list element.
        /// </summary>
        public bool IsListItem
        {
            get
            {
                IsListItemBacker = IsListItemBacker ?? (ParagraphNumberProperties != null);
                return (bool)IsListItemBacker;
            }
        }

        private int? IndentLevelBacker { get; set; }
        /// <summary>
        /// If this element is a list item, get the indentation level of the list item.
        /// </summary>
        public int? IndentLevel
        {
            get
            {
                if (!IsListItem)
                {
                    return null;
                }
                return IndentLevelBacker ?? (IndentLevelBacker = int.Parse(ParagraphNumberProperties.Descendants().First(el => el.Name.LocalName == "ilvl").GetAttribute(DocX.w + "val")));
            }
        }

        /// <summary>
        /// Determine if the list element is a numbered list of bulleted list element
        /// </summary>
        public ListItemType ListItemType;

        internal int startIndex, endIndex;

        /// <summary>
        /// Returns a list of all Pictures in a Paragraph.
        /// </summary>
        /// <example>
        /// Returns a list of all Pictures in a Paragraph.
        /// <code>
        /// // Create a document.
        /// using (DocX document = DocX.Load(@"Test.docx"))
        /// {
        ///    // Get the first Paragraph in a document.
        ///    Paragraph p = document.Paragraphs[0];
        /// 
        ///    // Get all of the Pictures in this Paragraph.
        ///    List<Picture> pictures = p.Pictures;
        ///
        ///    // Save this document.
        ///    document.Save();
        /// }
        /// </code>
        /// </example>
        public List<Picture> Pictures
        {
            get
            {
                List<Picture> pictures =
                (
                    from p in Xml.Descendants()
                    where (p.Name.LocalName == "drawing")
                    let id =
                    (
                        from e in p.Descendants()
                        where e.Name.LocalName.Equals("blip")
                        select e.Attribute(XName.Get("embed", "http://schemas.openxmlformats.org/officeDocument/2006/relationships")).Value
                    ).SingleOrDefault()
                    where id != null
                    let img = new Image(Document, mainPart.GetRelationship(id))
                    select new Picture(Document, p, img)
                ).ToList();


                return pictures;
            }
        }

        /// <summary>
        /// Returns a list of Hyperlinks in this Paragraph.
        /// </summary>
        /// <example>
        /// <code>
        /// // Create a document.
        /// using (DocX document = DocX.Load(@"Test.docx"))
        /// {
        ///    // Get the first Paragraph in this document.
        ///    Paragraph p = document.Paragraphs[0];
        ///    
        ///    // Get all of the hyperlinks in this Paragraph.
        ///    List<Hyperlink> hyperlinks = paragraph.Hyperlinks;
        ///    
        ///    // Change the first hyperlinks text and Uri
        ///    Hyperlink h0 = hyperlinks[0];
        ///    h0.Text = "DocX";
        ///    h0.Uri = new Uri("http://docx.codeplex.com");
        ///
        ///    // Save this document.
        ///    document.Save();
        /// }
        /// </code>
        /// </example>
        public List<Hyperlink> Hyperlinks
        {
            get
            {
                List<Hyperlink> hyperlinks = new List<Hyperlink>();

                List<XElement> hyperlink_elements =
                (
                    from h in Xml.Descendants()
                    where (h.Name.LocalName == "hyperlink" || h.Name.LocalName == "instrText")
                    select h
                ).ToList();

                foreach (XElement he in hyperlink_elements)
                {
                    if (he.Name.LocalName == "hyperlink")
                    {
                        try
                        {
                            Hyperlink h = new Hyperlink(Document, mainPart, he);
                            h.mainPart = mainPart;
                            hyperlinks.Add(h);
                        }

                        catch (Exception) { }
                    }

                    else
                    {
                        // Find the parent run, no matter how deeply nested we are.
                        XElement e = he;
                        while (e.Name.LocalName != "r")
                            e = e.Parent;

                        // Take every element until we reach w:fldCharType="end"
                        List<XElement> hyperlink_runs = new List<XElement>();
                        foreach (XElement r in e.ElementsAfterSelf(XName.Get("r", DocX.w.NamespaceName)))
                        {
                            // Add this run to the list.
                            hyperlink_runs.Add(r);

                            XElement fldChar = r.Descendants(XName.Get("fldChar", DocX.w.NamespaceName)).SingleOrDefault<XElement>();
                            if (fldChar != null)
                            {
                                XAttribute fldCharType = fldChar.Attribute(XName.Get("fldCharType", DocX.w.NamespaceName));
                                if (fldCharType != null && fldCharType.Value.Equals("end", StringComparison.CurrentCultureIgnoreCase))
                                {
                                    try
                                    {
                                        Hyperlink h = new Hyperlink(Document, he, hyperlink_runs);
                                        h.mainPart = mainPart;
                                        hyperlinks.Add(h);
                                    }

                                    catch (Exception) { }

                                    break;
                                }
                            }
                        }
                    }
                }

                return hyperlinks;
            }
        }

        ///<summary>
        /// The style name of the paragraph.
        ///</summary>
        public string StyleName
        {
            get
            {
                var element = this.GetOrCreate_pPr();
                var styleElement = element.Element(XName.Get("pStyle", DocX.w.NamespaceName));
                if (styleElement != null)
                {
                    var attr = styleElement.Attribute(XName.Get("val", DocX.w.NamespaceName));
                    if (attr != null && !string.IsNullOrEmpty(attr.Value))
                    {
                        return attr.Value;
                    }
                }
                return "Normal";
            }
            set
            {
                if (string.IsNullOrEmpty(value))
                {
                    value = "Normal";
                }
                var element = this.GetOrCreate_pPr();
                var styleElement = element.Element(XName.Get("pStyle", DocX.w.NamespaceName));
                if (styleElement == null)
                {
                    element.Add(new XElement(XName.Get("pStyle", DocX.w.NamespaceName)));
                    styleElement = element.Element(XName.Get("pStyle", DocX.w.NamespaceName));
                }
                styleElement.SetAttributeValue(XName.Get("val", DocX.w.NamespaceName), value);
            }
        }

        // A collection of field type DocProperty.
        private List<DocProperty> docProperties;

        internal List<XElement> styles = new List<XElement>();

        /// <summary>
        /// Returns a list of field type DocProperty in this document.
        /// </summary>
        public List<DocProperty> DocumentProperties
        {
            get { return docProperties; }
        }

        internal Paragraph(DocX document, XElement xml, int startIndex, ContainerType parent = ContainerType.None)
            : base(document, xml)
        {
            ParentContainer = parent;
            this.startIndex = startIndex;
            this.endIndex = startIndex + GetElementTextLength(xml);

            RebuildDocProperties();

            #region It's possible that a Paragraph may have pStyle references
            // Check if this Paragraph references any pStyle elements.
            var stylesElements = xml.Descendants(XName.Get("pStyle", DocX.w.NamespaceName));

            // If one or more pStyles are referenced.
            if (stylesElements.Count() > 0)
            {
                Uri style_package_uri = new Uri("/word/styles.xml", UriKind.Relative);
                PackagePart styles_document = document.package.GetPart(style_package_uri);

                using (TextReader tr = new StreamReader(styles_document.GetStream()))
                {
                    XDocument style_document = XDocument.Load(tr);
                    XElement styles_element = style_document.Element(XName.Get("styles", DocX.w.NamespaceName));

                    var styles_element_ids = stylesElements.Select(e => e.Attribute(XName.Get("val", DocX.w.NamespaceName)).Value);

                    //foreach(string id in styles_element_ids)
                    //{
                    //    var style = 
                    //    (
                    //        from d in styles_element.Descendants()
                    //        let styleId = d.Attribute(XName.Get("styleId", DocX.w.NamespaceName))
                    //        let type = d.Attribute(XName.Get("type", DocX.w.NamespaceName))
                    //        where type != null && type.Value == "paragraph" && styleId != null && styleId.Value == id
                    //        select d
                    //    ).First();

                    //    styles.Add(style);
                    //} 
                }
            }
            #endregion

            this.runs = Xml.Elements(XName.Get("r", DocX.w.NamespaceName)).ToList();
        }

        /// <summary>
        /// Insert a new Table before this Paragraph, this Table can be from this document or another document.
        /// </summary>
        /// <param name="t">The Table t to be inserted.</param>
        /// <returns>A new Table inserted before this Paragraph.</returns>
        /// <example>
        /// Insert a new Table before this Paragraph.
        /// <code>
        /// // Place holder for a Table.
        /// Table t;
        ///
        /// // Load document a.
        /// using (DocX documentA = DocX.Load(@"a.docx"))
        /// {
        ///     // Get the first Table from this document.
        ///     t = documentA.Tables[0];
        /// }
        ///
        /// // Load document b.
        /// using (DocX documentB = DocX.Load(@"b.docx"))
        /// {
        ///     // Get the first Paragraph in document b.
        ///     Paragraph p2 = documentB.Paragraphs[0];
        ///
        ///     // Insert the Table from document a before this Paragraph.
        ///     Table newTable = p2.InsertTableBeforeSelf(t);
        ///
        ///     // Save all changes made to document b.
        ///     documentB.Save();
        /// }// Release this document from memory.
        /// </code>
        /// </example>
        public override Table InsertTableBeforeSelf(Table t)
        {
            t = base.InsertTableBeforeSelf(t);
            t.mainPart = mainPart;
            return t;
        }

        private Direction direction;
        /// <summary>
        /// Gets or Sets the Direction of content in this Paragraph.
        /// <example>
        /// Create a Paragraph with content that flows right to left. Default is left to right.
        /// <code>
        /// // Create a new document.
        /// using (DocX document = DocX.Create("Test.docx"))
        /// {
        ///     // Create a new Paragraph with the text "Hello World".
        ///     Paragraph p = document.InsertParagraph("Hello World.");
        /// 
        ///     // Make this Paragraph flow right to left. Default is left to right.
        ///     p.Direction = Direction.RightToLeft;
        ///     
        ///     // Save all changes made to this document.
        ///     document.Save();
        /// }
        /// </code>
        /// </example>
        /// </summary>
        public Direction Direction
        {
            get
            {
                XElement pPr = GetOrCreate_pPr();
                XElement bidi = pPr.Element(XName.Get("bidi", DocX.w.NamespaceName));

                if (bidi == null)
                    return Direction.LeftToRight;

                else
                    return Direction.RightToLeft;
            }

            set
            {
                direction = value;

                XElement pPr = GetOrCreate_pPr();
                XElement bidi = pPr.Element(XName.Get("bidi", DocX.w.NamespaceName));

                if (direction == Direction.RightToLeft)
                {
                    if (bidi == null)
                        pPr.Add(new XElement(XName.Get("bidi", DocX.w.NamespaceName)));
                }

                else
                {
                    if (bidi != null)
                        bidi.Remove();
                }
            }
        }

        /// <summary>
        /// If the pPr element doesent exist it is created, either way it is returned by this function.
        /// </summary>
        /// <returns>The pPr element for this Paragraph.</returns>
        internal XElement GetOrCreate_pPr()
        {
            // Get the element.
            XElement pPr = Xml.Element(XName.Get("pPr", DocX.w.NamespaceName));

            // If it dosen't exist, create it.
            if (pPr == null)
            {
                Xml.AddFirst(new XElement(XName.Get("pPr", DocX.w.NamespaceName)));
                pPr = Xml.Element(XName.Get("pPr", DocX.w.NamespaceName));
            }

            // Return the pPr element for this Paragraph.
            return pPr;
        }

        /// <summary>
        /// If the ind element doesent exist it is created, either way it is returned by this function.
        /// </summary>
        /// <returns>The ind element for this Paragraphs pPr.</returns>
        internal XElement GetOrCreate_pPr_ind()
        {
            // Get the element.
            XElement pPr = GetOrCreate_pPr();
            XElement ind = pPr.Element(XName.Get("ind", DocX.w.NamespaceName));

            // If it dosen't exist, create it.
            if (ind == null)
            {
                pPr.Add(new XElement(XName.Get("ind", DocX.w.NamespaceName)));
                ind = pPr.Element(XName.Get("ind", DocX.w.NamespaceName));
            }

            // Return the pPr element for this Paragraph.
            return ind;
        }

        private float indentationFirstLine;
        /// <summary>
        /// Get or set the indentation of the first line of this Paragraph.
        /// </summary>
        /// <example>
        /// Indent only the first line of a Paragraph.
        /// <code>
        /// // Create a new document.
        /// using (DocX document = DocX.Create("Test.docx"))
        /// {
        ///     // Create a new Paragraph.
        ///     Paragraph p = document.InsertParagraph("Line 1\nLine 2\nLine 3");
        /// 
        ///     // Indent only the first line of the Paragraph.
        ///     p.IndentationFirstLine = 2.0f;
        ///     
        ///     // Save all changes made to this document.
        ///     document.Save();
        /// }
        /// </code>
        /// </example>
        public float IndentationFirstLine
        {
            get
            {
                XElement pPr = GetOrCreate_pPr();
                XElement ind = GetOrCreate_pPr_ind();
                XAttribute firstLine = ind.Attribute(XName.Get("firstLine", DocX.w.NamespaceName));

                if (firstLine != null)
                    return float.Parse(firstLine.Value);

                return 0.0f;
            }

            set
            {
                if (IndentationFirstLine != value)
                {
                    indentationFirstLine = value;

                    XElement pPr = GetOrCreate_pPr();
                    XElement ind = GetOrCreate_pPr_ind();

                    // Paragraph can either be firstLine or hanging (Remove hanging).
                    XAttribute hanging = ind.Attribute(XName.Get("hanging", DocX.w.NamespaceName));
                    if (hanging != null)
                        hanging.Remove();

                    string indentation = ((indentationFirstLine / 0.1) * 57).ToString();
                    XAttribute firstLine = ind.Attribute(XName.Get("firstLine", DocX.w.NamespaceName));
                    if (firstLine != null)
                        firstLine.Value = indentation;
                    else
                        ind.Add(new XAttribute(XName.Get("firstLine", DocX.w.NamespaceName), indentation));
                }
            }
        }

        private float indentationHanging;
        /// <summary>
        /// Get or set the indentation of all but the first line of this Paragraph.
        /// </summary>
        /// <example>
        /// Indent all but the first line of a Paragraph.
        /// <code>
        /// // Create a new document.
        /// using (DocX document = DocX.Create("Test.docx"))
        /// {
        ///     // Create a new Paragraph.
        ///     Paragraph p = document.InsertParagraph("Line 1\nLine 2\nLine 3");
        /// 
        ///     // Indent all but the first line of the Paragraph.
        ///     p.IndentationHanging = 1.0f;
        ///     
        ///     // Save all changes made to this document.
        ///     document.Save();
        /// }
        /// </code>
        /// </example>
        public float IndentationHanging
        {
            get
            {
                XElement pPr = GetOrCreate_pPr();
                XElement ind = GetOrCreate_pPr_ind();
                XAttribute hanging = ind.Attribute(XName.Get("hanging", DocX.w.NamespaceName));

                if (hanging != null)
                    return float.Parse(hanging.Value);

                return 0.0f;
            }

            set
            {
                if (IndentationHanging != value)
                {
                    indentationHanging = value;

                    XElement pPr = GetOrCreate_pPr();
                    XElement ind = GetOrCreate_pPr_ind();

                    // Paragraph can either be firstLine or hanging (Remove firstLine).
                    XAttribute firstLine = ind.Attribute(XName.Get("firstLine", DocX.w.NamespaceName));
                    if (firstLine != null)
                        firstLine.Remove();

                    string indentation = ((indentationHanging / 0.1) * 57).ToString();
                    XAttribute hanging = ind.Attribute(XName.Get("hanging", DocX.w.NamespaceName));
                    if (hanging != null)
                        hanging.Value = indentation;
                    else
                        ind.Add(new XAttribute(XName.Get("hanging", DocX.w.NamespaceName), indentation));
                }
            }
        }

        private float indentationBefore;
        /// <summary>
        /// Set the before indentation in cm for this Paragraph.
        /// </summary>
        /// <example>
        /// // Indent an entire Paragraph from the left.
        /// <code>
        /// // Create a new document.
        /// using (DocX document = DocX.Create("Test.docx"))
        /// {
        ///    // Create a new Paragraph.
        ///    Paragraph p = document.InsertParagraph("Line 1\nLine 2\nLine 3");
        ///
        ///    // Indent this entire Paragraph from the left.
        ///    p.IndentationBefore = 2.0f;
        ///    
        ///    // Save all changes made to this document.
        ///    document.Save();
        ///}
        /// </code>
        /// </example>
        public float IndentationBefore
        {
            get
            {
                XElement pPr = GetOrCreate_pPr();
                XElement ind = GetOrCreate_pPr_ind();

                XAttribute left = ind.Attribute(XName.Get("left", DocX.w.NamespaceName));
                if (left != null)
                    return float.Parse(left.Value);

                return 0.0f;
            }

            set
            {
                if (IndentationBefore != value)
                {
                    indentationBefore = value;

                    XElement pPr = GetOrCreate_pPr();
                    XElement ind = GetOrCreate_pPr_ind();

                    string indentation = ((indentationBefore / 0.1) * 57).ToString();

                    XAttribute left = ind.Attribute(XName.Get("left", DocX.w.NamespaceName));
                    if (left != null)
                        left.Value = indentation;
                    else
                        ind.Add(new XAttribute(XName.Get("left", DocX.w.NamespaceName), indentation));
                }
            }
        }

        private float indentationAfter = 0.0f;
        /// <summary>
        /// Set the after indentation in cm for this Paragraph.
        /// </summary>
        /// <example>
        /// // Indent an entire Paragraph from the right.
        /// <code>
        /// // Create a new document.
        /// using (DocX document = DocX.Create("Test.docx"))
        /// {
        ///     // Create a new Paragraph.
        ///     Paragraph p = document.InsertParagraph("Line 1\nLine 2\nLine 3");
        /// 
        ///     // Make the content of this Paragraph flow right to left.
        ///     p.Direction = Direction.RightToLeft;
        /// 
        ///     // Indent this entire Paragraph from the right.
        ///     p.IndentationAfter = 2.0f;
        ///     
        ///     // Save all changes made to this document.
        ///     document.Save();
        /// }
        /// </code>
        /// </example>
        public float IndentationAfter
        {
            get
            {
                XElement pPr = GetOrCreate_pPr();
                XElement ind = GetOrCreate_pPr_ind();

                XAttribute right = ind.Attribute(XName.Get("right", DocX.w.NamespaceName));
                if (right != null)
                    return float.Parse(right.Value);

                return 0.0f;
            }

            set
            {
                if (IndentationAfter != value)
                {
                    indentationAfter = value;

                    XElement pPr = GetOrCreate_pPr();
                    XElement ind = GetOrCreate_pPr_ind();

                    string indentation = ((indentationAfter / 0.1) * 57).ToString();

                    XAttribute right = ind.Attribute(XName.Get("right", DocX.w.NamespaceName));
                    if (right != null)
                        right.Value = indentation;
                    else
                        ind.Add(new XAttribute(XName.Get("right", DocX.w.NamespaceName), indentation));
                }
            }
        }

        /// <summary>
        /// Insert a new Table into this document before this Paragraph.
        /// </summary>
        /// <param name="rowCount">The number of rows this Table should have.</param>
        /// <param name="columnCount">The number of columns this Table should have.</param>
        /// <returns>A new Table inserted before this Paragraph.</returns>
        /// <example>
        /// <code>
        /// // Create a new document.
        /// using (DocX document = DocX.Create(@"Test.docx"))
        /// {
        ///     //Insert a Paragraph into this document.
        ///     Paragraph p = document.InsertParagraph("Hello World", false);
        ///
        ///     // Insert a new Table before this Paragraph.
        ///     Table newTable = p.InsertTableBeforeSelf(2, 2);
        ///     newTable.Design = TableDesign.LightShadingAccent2;
        ///     newTable.Alignment = Alignment.center;
        ///
        ///     // Save all changes made to this document.
        ///     document.Save();
        /// }// Release this document from memory.
        /// </code>
        /// </example>
        public override Table InsertTableBeforeSelf(int rowCount, int columnCount)
        {
            return base.InsertTableBeforeSelf(rowCount, columnCount);
        }

        /// <summary>
        /// Insert a new Table after this Paragraph.
        /// </summary>
        /// <param name="t">The Table t to be inserted.</param>
        /// <returns>A new Table inserted after this Paragraph.</returns>
        /// <example>
        /// Insert a new Table after this Paragraph.
        /// <code>
        /// // Place holder for a Table.
        /// Table t;
        ///
        /// // Load document a.
        /// using (DocX documentA = DocX.Load(@"a.docx"))
        /// {
        ///     // Get the first Table from this document.
        ///     t = documentA.Tables[0];
        /// }
        ///
        /// // Load document b.
        /// using (DocX documentB = DocX.Load(@"b.docx"))
        /// {
        ///     // Get the first Paragraph in document b.
        ///     Paragraph p2 = documentB.Paragraphs[0];
        ///
        ///     // Insert the Table from document a after this Paragraph.
        ///     Table newTable = p2.InsertTableAfterSelf(t);
        ///
        ///     // Save all changes made to document b.
        ///     documentB.Save();
        /// }// Release this document from memory.
        /// </code>
        /// </example>
        public override Table InsertTableAfterSelf(Table t)
        {
            t = base.InsertTableAfterSelf(t);
            t.mainPart = mainPart;
            return t;
        }

        /// <summary>
        /// Insert a new Table into this document after this Paragraph.
        /// </summary>
        /// <param name="rowCount">The number of rows this Table should have.</param>
        /// <param name="columnCount">The number of columns this Table should have.</param>
        /// <returns>A new Table inserted after this Paragraph.</returns>
        /// <example>
        /// <code>
        /// // Create a new document.
        /// using (DocX document = DocX.Create(@"Test.docx"))
        /// {
        ///     //Insert a Paragraph into this document.
        ///     Paragraph p = document.InsertParagraph("Hello World", false);
        ///
        ///     // Insert a new Table after this Paragraph.
        ///     Table newTable = p.InsertTableAfterSelf(2, 2);
        ///     newTable.Design = TableDesign.LightShadingAccent2;
        ///     newTable.Alignment = Alignment.center;
        ///
        ///     // Save all changes made to this document.
        ///     document.Save();
        /// }// Release this document from memory.
        /// </code>
        /// </example>
        public override Table InsertTableAfterSelf(int rowCount, int columnCount)
        {
            return base.InsertTableAfterSelf(rowCount, columnCount);
        }

        /// <summary>
        /// Insert a Paragraph before this Paragraph, this Paragraph may have come from the same or another document.
        /// </summary>
        /// <param name="p">The Paragraph to insert.</param>
        /// <returns>The Paragraph now associated with this document.</returns>
        /// <example>
        /// Take a Paragraph from document a, and insert it into document b before this Paragraph.
        /// <code>
        /// // Place holder for a Paragraph.
        /// Paragraph p;
        ///
        /// // Load document a.
        /// using (DocX documentA = DocX.Load(@"a.docx"))
        /// {
        ///     // Get the first paragraph from this document.
        ///     p = documentA.Paragraphs[0];
        /// }
        ///
        /// // Load document b.
        /// using (DocX documentB = DocX.Load(@"b.docx"))
        /// {
        ///     // Get the first Paragraph in document b.
        ///     Paragraph p2 = documentB.Paragraphs[0];
        ///
        ///     // Insert the Paragraph from document a before this Paragraph.
        ///     Paragraph newParagraph = p2.InsertParagraphBeforeSelf(p);
        ///
        ///     // Save all changes made to document b.
        ///     documentB.Save();
        /// }// Release this document from memory.
        /// </code> 
        /// </example>
        public override Paragraph InsertParagraphBeforeSelf(Paragraph p)
        {
            Paragraph p2 = base.InsertParagraphBeforeSelf(p);
            p2.PackagePart = mainPart;
            return p2;
        }

        /// <summary>
        /// Insert a new Paragraph before this Paragraph.
        /// </summary>
        /// <param name="text">The initial text for this new Paragraph.</param>
        /// <returns>A new Paragraph inserted before this Paragraph.</returns>
        /// <example>
        /// Insert a new paragraph before the first Paragraph in this document.
        /// <code>
        /// // Create a new document.
        /// using (DocX document = DocX.Create(@"Test.docx"))
        /// {
        ///     // Insert a Paragraph into this document.
        ///     Paragraph p = document.InsertParagraph("I am a Paragraph", false);
        ///
        ///     p.InsertParagraphBeforeSelf("I was inserted before the next Paragraph.");
        ///
        ///     // Save all changes made to this new document.
        ///     document.Save();
        ///    }// Release this new document form memory.
        /// </code>
        /// </example>
        public override Paragraph InsertParagraphBeforeSelf(string text)
        {
            Paragraph p = base.InsertParagraphBeforeSelf(text);
            p.PackagePart = mainPart;
            return p;
        }

        /// <summary>
        /// Insert a new Paragraph before this Paragraph.
        /// </summary>
        /// <param name="text">The initial text for this new Paragraph.</param>
        /// <param name="trackChanges">Should this insertion be tracked as a change?</param>
        /// <returns>A new Paragraph inserted before this Paragraph.</returns>
        /// <example>
        /// Insert a new paragraph before the first Paragraph in this document.
        /// <code>
        /// // Create a new document.
        /// using (DocX document = DocX.Create(@"Test.docx"))
        /// {
        ///     // Insert a Paragraph into this document.
        ///     Paragraph p = document.InsertParagraph("I am a Paragraph", false);
        ///
        ///     p.InsertParagraphBeforeSelf("I was inserted before the next Paragraph.", false);
        ///
        ///     // Save all changes made to this new document.
        ///     document.Save();
        ///    }// Release this new document form memory.
        /// </code>
        /// </example>
        public override Paragraph InsertParagraphBeforeSelf(string text, bool trackChanges)
        {
            Paragraph p = base.InsertParagraphBeforeSelf(text, trackChanges);
            p.PackagePart = mainPart;
            return p;
        }

        /// <summary>
        /// Insert a new Paragraph before this Paragraph.
        /// </summary>
        /// <param name="text">The initial text for this new Paragraph.</param>
        /// <param name="trackChanges">Should this insertion be tracked as a change?</param>
        /// <param name="formatting">The formatting to apply to this insertion.</param>
        /// <returns>A new Paragraph inserted before this Paragraph.</returns>
        /// <example>
        /// Insert a new paragraph before the first Paragraph in this document.
        /// <code>
        /// // Create a new document.
        /// using (DocX document = DocX.Create(@"Test.docx"))
        /// {
        ///     // Insert a Paragraph into this document.
        ///     Paragraph p = document.InsertParagraph("I am a Paragraph", false);
        ///
        ///     Formatting boldFormatting = new Formatting();
        ///     boldFormatting.Bold = true;
        ///
        ///     p.InsertParagraphBeforeSelf("I was inserted before the next Paragraph.", false, boldFormatting);
        ///
        ///     // Save all changes made to this new document.
        ///     document.Save();
        ///    }// Release this new document form memory.
        /// </code>
        /// </example>
        public override Paragraph InsertParagraphBeforeSelf(string text, bool trackChanges, Formatting formatting)
        {
            Paragraph p = base.InsertParagraphBeforeSelf(text, trackChanges, formatting);
            p.PackagePart = mainPart;
            return p;
        }

        /// <summary>
        /// Insert a page break before a Paragraph.
        /// </summary>
        /// <example>
        /// Insert 2 Paragraphs into a document with a page break between them.
        /// <code>
        /// using (DocX document = DocX.Create(@"Test.docx"))
        /// {
        ///    // Insert a new Paragraph.
        ///    Paragraph p1 = document.InsertParagraph("Paragraph 1", false);
        ///       
        ///    // Insert a new Paragraph.
        ///    Paragraph p2 = document.InsertParagraph("Paragraph 2", false);
        ///    
        ///    // Insert a page break before Paragraph two.
        ///    p2.InsertPageBreakBeforeSelf();
        ///    
        ///    // Save this document.
        ///    document.Save();
        /// }// Release this document from memory.
        /// </code>
        /// </example>
        public override void InsertPageBreakBeforeSelf()
        {
            base.InsertPageBreakBeforeSelf();
        }

        /// <summary>
        /// Insert a page break after a Paragraph.
        /// </summary>
        /// <example>
        /// Insert 2 Paragraphs into a document with a page break between them.
        /// <code>
        /// using (DocX document = DocX.Create(@"Test.docx"))
        /// {
        ///    // Insert a new Paragraph.
        ///    Paragraph p1 = document.InsertParagraph("Paragraph 1", false);
        ///       
        ///    // Insert a page break after this Paragraph.
        ///    p1.InsertPageBreakAfterSelf();
        ///       
        ///    // Insert a new Paragraph.
        ///    Paragraph p2 = document.InsertParagraph("Paragraph 2", false);
        ///
        ///    // Save this document.
        ///    document.Save();
        /// }// Release this document from memory.
        /// </code>
        /// </example>
        public override void InsertPageBreakAfterSelf()
        {
            base.InsertPageBreakAfterSelf();
        }

        [Obsolete("Instead use: InsertHyperlink(Hyperlink h, int index)")]
        public Paragraph InsertHyperlink(int index, Hyperlink h) { return InsertHyperlink(h, index); }

        /// <summary>
        /// This function inserts a hyperlink into a Paragraph at a specified character index.
        /// </summary>
        /// <param name="index">The index to insert at.</param>
        /// <param name="h">The hyperlink to insert.</param>
        /// <returns>The Paragraph with the Hyperlink inserted at the specified index.</returns>
        /// <!-- 
        /// This function was added by Brian Campbell aka chickendelicious on Jun 16 2010
        /// Thank you Brian.
        /// -->
        public Paragraph InsertHyperlink(Hyperlink h, int index = 0)
        {
            // Convert the path of this mainPart to its equilivant rels file path.
            string path = mainPart.Uri.OriginalString.Replace("/word/", "");
            Uri rels_path = new Uri("/word/_rels/" + path + ".rels", UriKind.Relative);

            // Check to see if the rels file exists and create it if not.
            if (!Document.package.PartExists(rels_path))
                HelperFunctions.CreateRelsPackagePart(Document, rels_path);

            // Check to see if a rel for this Picture exists, create it if not.
            var Id = GetOrGenerateRel(h);

            XElement h_xml;
            if (index == 0)
            {
                // Add this hyperlink as the last element.
                Xml.AddFirst(h.Xml);

                // Extract the picture back out of the DOM.
                h_xml = (XElement)Xml.FirstNode;
            }

            else
            {
                // Get the first run effected by this Insert
                Run run = GetFirstRunEffectedByEdit(index);

                if (run == null)
                {
                    // Add this hyperlink as the last element.
                    Xml.Add(h.Xml);

                    // Extract the picture back out of the DOM.
                    h_xml = (XElement)Xml.LastNode;
                }

                else
                {
                    // Split this run at the point you want to insert
                    XElement[] splitRun = Run.SplitRun(run, index);

                    // Replace the origional run.
                    run.Xml.ReplaceWith
                    (
                        splitRun[0],
                        h.Xml,
                        splitRun[1]
                    );

                    // Get the first run effected by this Insert
                    run = GetFirstRunEffectedByEdit(index);

                    // The picture has to be the next element, extract it back out of the DOM.
                    h_xml = (XElement)run.Xml.NextNode;
                }

                h_xml.SetAttributeValue(DocX.r + "id", Id);
            }

            return this;
        }

        /// <summary>
        /// Remove the Hyperlink at the provided index. The first hyperlink is at index 0.
        /// Using a negative index or an index greater than the index of the last hyperlink will cause an ArgumentOutOfRangeException() to be thrown.
        /// </summary>
        /// <param name="index">The index of the hyperlink to be removed.</param>
        /// <example>
        /// <code>
        /// // Crete a new document.
        /// using (DocX document = DocX.Create("Test.docx"))
        /// {
        ///     // Add a Hyperlink into this document.
        ///     Hyperlink h = document.AddHyperlink("link", new Uri("http://www.google.com"));
        ///
        ///     // Insert a new Paragraph into the document.
        ///     Paragraph p1 = document.InsertParagraph("AC");
        ///     
        ///     // Insert the hyperlink into this Paragraph.
        ///     p1.InsertHyperlink(1, h);
        ///     Assert.IsTrue(p1.Text == "AlinkC"); // Make sure the hyperlink was inserted correctly;
        ///     
        ///     // Remove the hyperlink
        ///     p1.RemoveHyperlink(0);
        ///     Assert.IsTrue(p1.Text == "AC"); // Make sure the hyperlink was removed correctly;
        /// }
        /// </code>
        /// </example>
        public void RemoveHyperlink(int index)
        {
            // Dosen't make sense to remove a Hyperlink at a negative index.
            if (index < 0)
                throw new ArgumentOutOfRangeException();

            // Need somewhere to store the count.
            int count = 0;
            bool found = false;
            RemoveHyperlinkRecursive(Xml, index, ref count, ref found);

            // If !found then the user tried to remove a hyperlink at an index greater than the last. 
            if (!found)
                throw new ArgumentOutOfRangeException();
        }

        internal void RemoveHyperlinkRecursive(XElement xml, int index, ref int count, ref bool found)
        {
            if (xml.Name.LocalName.Equals("hyperlink", StringComparison.CurrentCultureIgnoreCase))
            {
                // This is the hyperlink to be removed.
                if (count == index)
                {
                    found = true;
                    xml.Remove();
                }

                else
                    count++;
            }

            if (xml.HasElements)
                foreach (XElement e in xml.Elements())
                    if (!found)
                        RemoveHyperlinkRecursive(e, index, ref count, ref found);
        }

        /// <summary>
        /// Insert a Paragraph after this Paragraph, this Paragraph may have come from the same or another document.
        /// </summary>
        /// <param name="p">The Paragraph to insert.</param>
        /// <returns>The Paragraph now associated with this document.</returns>
        /// <example>
        /// Take a Paragraph from document a, and insert it into document b after this Paragraph.
        /// <code>
        /// // Place holder for a Paragraph.
        /// Paragraph p;
        ///
        /// // Load document a.
        /// using (DocX documentA = DocX.Load(@"a.docx"))
        /// {
        ///     // Get the first paragraph from this document.
        ///     p = documentA.Paragraphs[0];
        /// }
        ///
        /// // Load document b.
        /// using (DocX documentB = DocX.Load(@"b.docx"))
        /// {
        ///     // Get the first Paragraph in document b.
        ///     Paragraph p2 = documentB.Paragraphs[0];
        ///
        ///     // Insert the Paragraph from document a after this Paragraph.
        ///     Paragraph newParagraph = p2.InsertParagraphAfterSelf(p);
        ///
        ///     // Save all changes made to document b.
        ///     documentB.Save();
        /// }// Release this document from memory.
        /// </code> 
        /// </example>
        public override Paragraph InsertParagraphAfterSelf(Paragraph p)
        {
            Paragraph p2 = base.InsertParagraphAfterSelf(p);
            p2.PackagePart = mainPart;
            return p2;
        }

        /// <summary>
        /// Insert a new Paragraph after this Paragraph.
        /// </summary>
        /// <param name="text">The initial text for this new Paragraph.</param>
        /// <param name="trackChanges">Should this insertion be tracked as a change?</param>
        /// <param name="formatting">The formatting to apply to this insertion.</param>
        /// <returns>A new Paragraph inserted after this Paragraph.</returns>
        /// <example>
        /// Insert a new paragraph after the first Paragraph in this document.
        /// <code>
        /// // Create a new document.
        /// using (DocX document = DocX.Create(@"Test.docx"))
        /// {
        ///     // Insert a Paragraph into this document.
        ///     Paragraph p = document.InsertParagraph("I am a Paragraph", false);
        ///
        ///     Formatting boldFormatting = new Formatting();
        ///     boldFormatting.Bold = true;
        ///
        ///     p.InsertParagraphAfterSelf("I was inserted after the previous Paragraph.", false, boldFormatting);
        ///
        ///     // Save all changes made to this new document.
        ///     document.Save();
        ///    }// Release this new document form memory.
        /// </code>
        /// </example>
        public override Paragraph InsertParagraphAfterSelf(string text, bool trackChanges, Formatting formatting)
        {
            Paragraph p = base.InsertParagraphAfterSelf(text, trackChanges, formatting);
            p.PackagePart = mainPart;
            return p;
        }

        /// <summary>
        /// Insert a new Paragraph after this Paragraph.
        /// </summary>
        /// <param name="text">The initial text for this new Paragraph.</param>
        /// <param name="trackChanges">Should this insertion be tracked as a change?</param>
        /// <returns>A new Paragraph inserted after this Paragraph.</returns>
        /// <example>
        /// Insert a new paragraph after the first Paragraph in this document.
        /// <code>
        /// // Create a new document.
        /// using (DocX document = DocX.Create(@"Test.docx"))
        /// {
        ///     // Insert a Paragraph into this document.
        ///     Paragraph p = document.InsertParagraph("I am a Paragraph", false);
        ///
        ///     p.InsertParagraphAfterSelf("I was inserted after the previous Paragraph.", false);
        ///
        ///     // Save all changes made to this new document.
        ///     document.Save();
        ///    }// Release this new document form memory.
        /// </code>
        /// </example>
        public override Paragraph InsertParagraphAfterSelf(string text, bool trackChanges)
        {
            Paragraph p = base.InsertParagraphAfterSelf(text, trackChanges);
            p.PackagePart = mainPart;
            return p;
        }

        /// <summary>
        /// Insert a new Paragraph after this Paragraph.
        /// </summary>
        /// <param name="text">The initial text for this new Paragraph.</param>
        /// <returns>A new Paragraph inserted after this Paragraph.</returns>
        /// <example>
        /// Insert a new paragraph after the first Paragraph in this document.
        /// <code>
        /// // Create a new document.
        /// using (DocX document = DocX.Create(@"Test.docx"))
        /// {
        ///     // Insert a Paragraph into this document.
        ///     Paragraph p = document.InsertParagraph("I am a Paragraph", false);
        ///
        ///     p.InsertParagraphAfterSelf("I was inserted after the previous Paragraph.");
        ///
        ///     // Save all changes made to this new document.
        ///     document.Save();
        ///    }// Release this new document form memory.
        /// </code>
        /// </example>
        public override Paragraph InsertParagraphAfterSelf(string text)
        {
            Paragraph p = base.InsertParagraphAfterSelf(text);
            p.PackagePart = mainPart;
            return p;
        }

        private void RebuildDocProperties()
        {
            docProperties =
            (
                from xml in Xml.Descendants(XName.Get("fldSimple", DocX.w.NamespaceName))
                select new DocProperty(Document, xml)
            ).ToList();
        }

        /// <summary>
        /// Gets or set this Paragraphs text alignment.
        /// </summary>
        public Alignment Alignment
        {
            get
            {
                XElement pPr = GetOrCreate_pPr();
                XElement jc = pPr.Element(XName.Get("jc", DocX.w.NamespaceName));

                if (jc != null)
                {
                    XAttribute a = jc.Attribute(XName.Get("val", DocX.w.NamespaceName));

                    switch (a.Value.ToLower())
                    {
                        case "left": return Novacode.Alignment.left;
                        case "right": return Novacode.Alignment.right;
                        case "center": return Novacode.Alignment.center;
                        case "both": return Novacode.Alignment.both;
                    }
                }

                return Novacode.Alignment.left;
            }

            set
            {
                alignment = value;

                XElement pPr = GetOrCreate_pPr();
                XElement jc = pPr.Element(XName.Get("jc", DocX.w.NamespaceName));

                if (alignment != Novacode.Alignment.left)
                {
                    if (jc == null)
                        pPr.Add(new XElement(XName.Get("jc", DocX.w.NamespaceName), new XAttribute(XName.Get("val", DocX.w.NamespaceName), alignment.ToString())));
                    else
                        jc.Attribute(XName.Get("val", DocX.w.NamespaceName)).Value = alignment.ToString();
                }

                else
                {
                    if (jc != null)
                        jc.Remove();
                }
            }
        }

        /// <summary>
        /// Remove this Paragraph from the document.
        /// </summary>
        /// <param name="trackChanges">Should this remove be tracked as a change?</param>
        /// <example>
        /// Remove a Paragraph from a document and track it as a change.
        /// <code>
        /// // Create a document using a relative filename.
        /// using (DocX document = DocX.Load(@"C:\Example\Test.docx"))
        /// {
        ///     // Create and Insert a new Paragraph into this document.
        ///     Paragraph p = document.InsertParagraph("Hello", false);
        ///
        ///     // Remove the Paragraph and track this as a change.
        ///     p.Remove(true);
        ///
        ///     // Save all changes made to this document.
        ///     document.Save();
        /// }// Release this document from memory.
        /// </code>
        /// </example>
        public void Remove(bool trackChanges)
        {
            if (trackChanges)
            {
                DateTime now = DateTime.Now.ToUniversalTime();

                List<XElement> elements = Xml.Elements().ToList();
                List<XElement> temp = new List<XElement>();
                for (int i = 0; i < elements.Count(); i++)
                {
                    XElement e = elements[i];

                    if (e.Name.LocalName != "del")
                    {
                        temp.Add(e);
                        e.Remove();
                    }

                    else
                    {
                        if (temp.Count() > 0)
                        {
                            e.AddBeforeSelf(CreateEdit(EditType.del, now, temp.Elements()));
                            temp.Clear();
                        }
                    }
                }

                if (temp.Count() > 0)
                    Xml.Add(CreateEdit(EditType.del, now, temp));
            }

            else
            {
                // If this is the only Paragraph in the Cell then we cannot remove it.
                if (Xml.Parent.Name.LocalName == "tc" && Xml.Parent.Elements(XName.Get("p", DocX.w.NamespaceName)).Count() == 1)
                    Xml.Value = string.Empty;

                else
                {
                    // Remove this paragraph from the document
                    Xml.Remove();
                    Xml = null;
                }
            }
        }

        /// <summary>
        /// Gets the text value of this Paragraph.
        /// </summary>
        public string Text
        {
            // Returns the underlying XElement's Value property.
            get
            {
                return HelperFunctions.GetText(Xml);
            }
        }

        /// <summary>
        /// Gets the formatted text value of this Paragraph.
        /// </summary>
        public List<FormattedText> MagicText
        {
            // Returns the underlying XElement's Value property.
            get
            {
              try
              {
                return HelperFunctions.GetFormattedText(Xml);

              }
              catch (Exception)
              {
                return null;
              }            
            
            }
        }

        //public Picture InsertPicture(Picture picture)
        //{
        //    Picture newPicture = picture;
        //    newPicture.i = new XElement(picture.i);

        //    xml.Add(newPicture.i);
        //    pictures.Add(newPicture);
        //    return newPicture;  
        //}

        /// <summary>
        /// Insert a Picture at the end of this paragraph.
        /// </summary>
        /// <param name="description">A string to describe this Picture.</param>
        /// <param name="imageID">The unique id that identifies the Image this Picture represents.</param>
        /// <param name="name">The name of this image.</param>
        /// <returns>A Picture.</returns>
        /// <example>
        /// <code>
        /// // Create a document using a relative filename.
        /// using (DocX document = DocX.Create(@"Test.docx"))
        /// {
        ///     // Add a new Paragraph to this document.
        ///     Paragraph p = document.InsertParagraph("Here is Picture 1", false);
        ///
        ///     // Add an Image to this document.
        ///     Novacode.Image img = document.AddImage(@"Image.jpg");
        ///
        ///     // Insert pic at the end of Paragraph p.
        ///     Picture pic = p.InsertPicture(img.Id, "Photo 31415", "A pie I baked.");
        ///
        ///     // Rotate the Picture clockwise by 30 degrees. 
        ///     pic.Rotation = 30;
        ///
        ///     // Resize the Picture.
        ///     pic.Width = 400;
        ///     pic.Height = 300;
        ///
        ///     // Set the shape of this Picture to be a cube.
        ///     pic.SetPictureShape(BasicShapes.cube);
        ///
        ///     // Flip the Picture Horizontally.
        ///     pic.FlipHorizontal = true;
        ///
        ///     // Save all changes made to this document.
        ///     document.Save();
        /// }// Release this document from memory.
        /// </code>
        /// </example>
        /// Removed to simplify the API.
        //public Picture InsertPicture(string imageID, string name, string description)
        //{
        //    Picture p = CreatePicture(Document, imageID, name, description);
        //    Xml.Add(p.Xml);
        //    return p;
        //}

        // Removed because it confusses the API.
        //public Picture InsertPicture(string imageID)
        //{
        //    return InsertPicture(imageID, string.Empty, string.Empty);
        //}

        //public Picture InsertPicture(int index, Picture picture)
        //{
        //    Picture p = picture;
        //    p.i = new XElement(picture.i);

        //    Run run = GetFirstRunEffectedByEdit(index);

        //    if (run == null)
        //        xml.Add(p.i);
        //    else
        //    {
        //        // Split this run at the point you want to insert
        //        XElement[] splitRun = Run.SplitRun(run, index);

        //        // Replace the origional run
        //        run.Xml.ReplaceWith
        //        (
        //            splitRun[0],
        //            p.i,
        //            splitRun[1]
        //        );
        //    }

        //    // Rebuild the run lookup for this paragraph
        //    runLookup.Clear();
        //    BuildRunLookup(xml);
        //    DocX.RenumberIDs(document);
        //    return p;
        //}

        /// <summary>
        /// Insert a Picture into this Paragraph at a specified index.
        /// </summary>
        /// <param name="description">A string to describe this Picture.</param>
        /// <param name="imageID">The unique id that identifies the Image this Picture represents.</param>
        /// <param name="name">The name of this image.</param>
        /// <param name="index">The index to insert this Picture at.</param>
        /// <returns>A Picture.</returns>
        /// <example>
        /// <code>
        /// // Create a document using a relative filename.
        /// using (DocX document = DocX.Create(@"Test.docx"))
        /// {
        ///     // Add a new Paragraph to this document.
        ///     Paragraph p = document.InsertParagraph("Here is Picture 1", false);
        ///
        ///     // Add an Image to this document.
        ///     Novacode.Image img = document.AddImage(@"Image.jpg");
        ///
        ///     // Insert pic at the start of Paragraph p.
        ///     Picture pic = p.InsertPicture(0, img.Id, "Photo 31415", "A pie I baked.");
        ///
        ///     // Rotate the Picture clockwise by 30 degrees. 
        ///     pic.Rotation = 30;
        ///
        ///     // Resize the Picture.
        ///     pic.Width = 400;
        ///     pic.Height = 300;
        ///
        ///     // Set the shape of this Picture to be a cube.
        ///     pic.SetPictureShape(BasicShapes.cube);
        ///
        ///     // Flip the Picture Horizontally.
        ///     pic.FlipHorizontal = true;
        ///
        ///     // Save all changes made to this document.
        ///     document.Save();
        /// }// Release this document from memory.
        /// </code>
        /// </example>
        /// Removed to simplify API.
        //public Picture InsertPicture(int index, string imageID, string name, string description)
        //{
        //    Picture picture = CreatePicture(Document, imageID, name, description);

        //    Run run = GetFirstRunEffectedByEdit(index);

        //    if (run == null)
        //        Xml.Add(picture.Xml);
        //    else
        //    {
        //        // Split this run at the point you want to insert
        //        XElement[] splitRun = Run.SplitRun(run, index);

        //        // Replace the origional run
        //        run.Xml.ReplaceWith
        //        (
        //            splitRun[0],
        //            picture.Xml,
        //            splitRun[1]
        //        );
        //    }

        //    HelperFunctions.RenumberIDs(Document);
        //    return picture;
        //}

        /// <summary>
        /// Create a new Picture.
        /// </summary>
        /// <param name="id">A unique id that identifies an Image embedded in this document.</param>
        /// <param name="name">The name of this Picture.</param>
        /// <param name="descr">The description of this Picture.</param>
        static internal Picture CreatePicture(DocX document, string id, string name, string descr)
        {
            PackagePart part = document.package.GetPart(document.mainPart.GetRelationship(id).TargetUri);

            int cx, cy;

            using (System.Drawing.Image img = System.Drawing.Image.FromStream(part.GetStream()))
            {
                cx = img.Width * 9526;
                cy = img.Height * 9526;
            }

            XElement e = new XElement(DocX.w + "drawing");

            XElement xml = XElement.Parse
            (string.Format(@"
            <drawing xmlns = ""http://schemas.openxmlformats.org/wordprocessingml/2006/main"">
                <wp:inline distT=""0"" distB=""0"" distL=""0"" distR=""0"" xmlns:wp=""http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing"">
                    <wp:extent cx=""{0}"" cy=""{1}"" />
                    <wp:effectExtent l=""0"" t=""0"" r=""0"" b=""0"" />
                    <wp:docPr id=""1"" name=""{3}"" descr=""{4}"" />
                    <wp:cNvGraphicFramePr>
                        <a:graphicFrameLocks xmlns:a=""http://schemas.openxmlformats.org/drawingml/2006/main"" noChangeAspect=""1"" />
                    </wp:cNvGraphicFramePr>
                    <a:graphic xmlns:a=""http://schemas.openxmlformats.org/drawingml/2006/main"">
                        <a:graphicData uri=""http://schemas.openxmlformats.org/drawingml/2006/picture"">
                            <pic:pic xmlns:pic=""http://schemas.openxmlformats.org/drawingml/2006/picture"">
                                <pic:nvPicPr>
                                <pic:cNvPr id=""0"" name=""{3}"" />
                                    <pic:cNvPicPr />
                                </pic:nvPicPr>
                                <pic:blipFill>
                                    <a:blip r:embed=""{2}"" xmlns:r=""http://schemas.openxmlformats.org/officeDocument/2006/relationships""/>
                                    <a:stretch>
                                        <a:fillRect />
                                    </a:stretch>
                                </pic:blipFill>
                                <pic:spPr>
                                    <a:xfrm>
                                        <a:off x=""0"" y=""0"" />
                                        <a:ext cx=""{0}"" cy=""{1}"" />
                                    </a:xfrm>
                                    <a:prstGeom prst=""rect"">
                                        <a:avLst />
                                    </a:prstGeom>
                                </pic:spPr>
                            </pic:pic>
                        </a:graphicData>
                    </a:graphic>
                </wp:inline>
            </drawing>
            ", cx, cy, id, name, descr));

            return new Picture(document, xml, new Image(document, document.mainPart.GetRelationship(id)));
        }

        // Removed because it confusses the API.
        //public Picture InsertPicture(int index, string imageID)
        //{
        //    return InsertPicture(index, imageID, string.Empty, string.Empty);
        //}

        /// <summary>
        /// Creates an Edit either a ins or a del with the specified content and date
        /// </summary>
        /// <param name="t">The type of this edit (ins or del)</param>
        /// <param name="edit_time">The time stamp to use for this edit</param>
        /// <param name="content">The initial content of this edit</param>
        /// <returns></returns>
        internal static XElement CreateEdit(EditType t, DateTime edit_time, object content)
        {
            if (t == EditType.del)
            {
                foreach (object o in (IEnumerable<XElement>)content)
                {
                    if (o is XElement)
                    {
                        XElement e = (o as XElement);
                        IEnumerable<XElement> ts = e.DescendantsAndSelf(XName.Get("t", DocX.w.NamespaceName));

                        for (int i = 0; i < ts.Count(); i++)
                        {
                            XElement text = ts.ElementAt(i);
                            text.ReplaceWith(new XElement(DocX.w + "delText", text.Attributes(), text.Value));
                        }
                    }
                }
            }

            return
            (
                new XElement(DocX.w + t.ToString(),
                    new XAttribute(DocX.w + "id", 0),
                    new XAttribute(DocX.w + "author", WindowsIdentity.GetCurrent().Name),
                    new XAttribute(DocX.w + "date", edit_time),
                content)
            );
        }

        internal Run GetFirstRunEffectedByEdit(int index, EditType type = EditType.ins)
        {
            int len = HelperFunctions.GetText(Xml).Length;

            // Make sure we are looking within an acceptable index range.
            if (index < 0 || ((type == EditType.ins && index > len) || (type == EditType.del && index >= len)))
                throw new ArgumentOutOfRangeException();

            // Need some memory that can be updated by the recursive search for the XElement to Split.
            int count = 0;
            Run theOne = null;

            GetFirstRunEffectedByEditRecursive(Xml, index, ref count, ref theOne, type);

            return theOne;
        }

        internal void GetFirstRunEffectedByEditRecursive(XElement Xml, int index, ref int count, ref Run theOne, EditType type)
        {
            count += HelperFunctions.GetSize(Xml);

            // If the EditType is deletion then we must return the next blah
            if (count > 0 && ((type == EditType.del && count > index) || (type == EditType.ins && count >= index)))
            {
                // Correct the index
                foreach (XElement e in Xml.ElementsBeforeSelf())
                    count -= HelperFunctions.GetSize(e);

                count -= HelperFunctions.GetSize(Xml);

                // We have found the element, now find the run it belongs to.
                while (Xml.Name.LocalName != "r")
                    Xml = Xml.Parent;

                theOne = new Run(Document, Xml, count);
                return;
            }

            if (Xml.HasElements)
                foreach (XElement e in Xml.Elements())
                    if (theOne == null)
                        GetFirstRunEffectedByEditRecursive(e, index, ref count, ref theOne, type);
        }

        /// <!-- 
        /// Bug found and fixed by krugs525 on August 12 2009.
        /// Use TFS compare to see exact code change.
        /// -->
        static internal int GetElementTextLength(XElement run)
        {
            int count = 0;

            if (run == null)
                return count;

            foreach (var d in run.Descendants())
            {
                switch (d.Name.LocalName)
                {
                    case "tab":
                        if (d.Parent.Name.LocalName != "tabs")
                            goto case "br"; break;
                    case "br": count++; break;
                    case "t": goto case "delText";
                    case "delText": count += d.Value.Length; break;
                    default: break;
                }
            }
            return count;
        }

        internal XElement[] SplitEdit(XElement edit, int index, EditType type)
        {
            Run run = GetFirstRunEffectedByEdit(index, type);

            XElement[] splitRun = Run.SplitRun(run, index, type);

            XElement splitLeft = new XElement(edit.Name, edit.Attributes(), run.Xml.ElementsBeforeSelf(), splitRun[0]);
            if (GetElementTextLength(splitLeft) == 0)
                splitLeft = null;

            XElement splitRight = new XElement(edit.Name, edit.Attributes(), splitRun[1], run.Xml.ElementsAfterSelf());
            if (GetElementTextLength(splitRight) == 0)
                splitRight = null;

            return
            (
                new XElement[]
                {
                    splitLeft,
                    splitRight
                }
            );
        }

        /// <summary>
        /// Inserts a specified instance of System.String into a Novacode.DocX.Paragraph at a specified index position.
        /// </summary>
        /// <example>
        /// <code> 
        /// // Create a document using a relative filename.
        /// using (DocX document = DocX.Load(@"C:\Example\Test.docx"))
        /// {
        ///     // Create a text formatting.
        ///     Formatting f = new Formatting();
        ///     f.FontColor = Color.Red;
        ///     f.Size = 30;
        ///
        ///     // Iterate through the Paragraphs in this document.
        ///     foreach (Paragraph p in document.Paragraphs)
        ///     {
        ///         // Insert the string "Start: " at the begining of every Paragraph and flag it as a change.
        ///         p.InsertText("Start: ", true, f);
        ///     }
        ///
        ///     // Save all changes made to this document.
        ///     document.Save();
        /// }// Release this document from memory.
        /// </code>
        /// </example>
        /// <example>
        /// Inserting tabs using the \t switch.
        /// <code>  
        /// // Create a document using a relative filename.
        /// using (DocX document = DocX.Load(@"C:\Example\Test.docx"))
        /// {
        ///      // Create a text formatting.
        ///      Formatting f = new Formatting();
        ///      f.FontColor = Color.Red;
        ///      f.Size = 30;
        ///        
        ///      // Iterate through the paragraphs in this document.
        ///      foreach (Paragraph p in document.Paragraphs)
        ///      {
        ///          // Insert the string "\tEnd" at the end of every paragraph and flag it as a change.
        ///          p.InsertText("\tEnd", true, f);
        ///      }
        ///       
        ///     // Save all changes made to this document.
        ///     document.Save();
        /// }// Release this document from memory.
        /// </code>
        /// </example>
        /// <seealso cref="Paragraph.RemoveText(int, bool)"/>
        /// <seealso cref="Paragraph.RemoveText(int, int, bool)"/>
        /// <seealso cref="Paragraph.ReplaceText(string, string, bool)"/>
        /// <seealso cref="Paragraph.ReplaceText(string, string, bool, RegexOptions)"/>
        /// <param name="value">The System.String to insert.</param>
        /// <param name="trackChanges">Flag this insert as a change.</param>
        /// <param name="formatting">The text formatting.</param>
        public void InsertText(string value, bool trackChanges = false, Formatting formatting = null)
        {
            // Default values for optional parameters must be compile time constants.
            // Would have like to write 'public void InsertText(string value, bool trackChanges = false, Formatting formatting = new Formatting())
            if (formatting == null) formatting = new Formatting();

            List<XElement> newRuns = HelperFunctions.FormatInput(value, formatting.Xml);
            Xml.Add(newRuns);

            HelperFunctions.RenumberIDs(Document);
        }

        /// <summary>
        /// Inserts a specified instance of System.String into a Novacode.DocX.Paragraph at a specified index position.
        /// </summary>
        /// <example>
        /// <code> 
        /// // Create a document using a relative filename.
        /// using (DocX document = DocX.Load(@"C:\Example\Test.docx"))
        /// {
        ///     // Create a text formatting.
        ///     Formatting f = new Formatting();
        ///     f.FontColor = Color.Red;
        ///     f.Size = 30;
        ///
        ///     // Iterate through the Paragraphs in this document.
        ///     foreach (Paragraph p in document.Paragraphs)
        ///     {
        ///         // Insert the string "Start: " at the begining of every Paragraph and flag it as a change.
        ///         p.InsertText(0, "Start: ", true, f);
        ///     }
        ///
        ///     // Save all changes made to this document.
        ///     document.Save();
        /// }// Release this document from memory.
        /// </code>
        /// </example>
        /// <example>
        /// Inserting tabs using the \t switch.
        /// <code>  
        /// // Create a document using a relative filename.
        /// using (DocX document = DocX.Load(@"C:\Example\Test.docx"))
        /// {
        ///     // Create a text formatting.
        ///     Formatting f = new Formatting();
        ///     f.FontColor = Color.Red;
        ///     f.Size = 30;
        ///
        ///     // Iterate through the paragraphs in this document.
        ///     foreach (Paragraph p in document.Paragraphs)
        ///     {
        ///         // Insert the string "\tStart:\t" at the begining of every paragraph and flag it as a change.
        ///         p.InsertText(0, "\tStart:\t", true, f);
        ///     }
        ///
        ///     // Save all changes made to this document.
        ///     document.Save();
        /// }// Release this document from memory.
        /// </code>
        /// </example>
        /// <seealso cref="Paragraph.RemoveText(int, bool)"/>
        /// <seealso cref="Paragraph.RemoveText(int, int, bool)"/>
        /// <seealso cref="Paragraph.ReplaceText(string, string, bool)"/>
        /// <seealso cref="Paragraph.ReplaceText(string, string, bool, RegexOptions)"/>
        /// <param name="index">The index position of the insertion.</param>
        /// <param name="value">The System.String to insert.</param>
        /// <param name="trackChanges">Flag this insert as a change.</param>
        /// <param name="formatting">The text formatting.</param>
        public void InsertText(int index, string value, bool trackChanges = false, Formatting formatting = null)
        {
            // Timestamp to mark the start of insert
            DateTime now = DateTime.Now;
            DateTime insert_datetime = new DateTime(now.Year, now.Month, now.Day, now.Hour, now.Minute, 0, DateTimeKind.Utc);

            // Get the first run effected by this Insert
            Run run = GetFirstRunEffectedByEdit(index);

            if (run == null)
            {
                object insert;
                if (formatting != null)
                    insert = HelperFunctions.FormatInput(value, formatting.Xml);
                else
                    insert = HelperFunctions.FormatInput(value, null);

                if (trackChanges)
                    insert = CreateEdit(EditType.ins, insert_datetime, insert);
                Xml.Add(insert);
            }

            else
            {
                object newRuns;
                if (formatting != null)
                    newRuns = HelperFunctions.FormatInput(value, formatting.Xml);
                else
                    newRuns = HelperFunctions.FormatInput(value, run.Xml.Element(XName.Get("rPr", DocX.w.NamespaceName)));

                // The parent of this Run
                XElement parentElement = run.Xml.Parent;
                switch (parentElement.Name.LocalName)
                {
                    case "ins":
                        {
                            // The datetime that this ins was created
                            DateTime parent_ins_date = DateTime.Parse(parentElement.Attribute(XName.Get("date", DocX.w.NamespaceName)).Value);

                            /* 
                             * Special case: You want to track changes,
                             * and the first Run effected by this insert
                             * has a datetime stamp equal to now.
                            */
                            if (trackChanges && parent_ins_date.CompareTo(insert_datetime) == 0)
                            {
                                /*
                                 * Inserting into a non edit and this special case, is the same procedure.
                                */
                                goto default;
                            }

                            /*
                             * If not the special case above, 
                             * then inserting into an ins or a del, is the same procedure.
                            */
                            goto case "del";
                        }

                    case "del":
                        {
                            object insert = newRuns;
                            if (trackChanges)
                                insert = CreateEdit(EditType.ins, insert_datetime, newRuns);

                            // Split this Edit at the point you want to insert
                            XElement[] splitEdit = SplitEdit(parentElement, index, EditType.ins);

                            // Replace the origional run
                            parentElement.ReplaceWith
                            (
                                splitEdit[0],
                                insert,
                                splitEdit[1]
                            );

                            break;
                        }

                    default:
                        {
                            object insert = newRuns;
                            if (trackChanges && !parentElement.Name.LocalName.Equals("ins"))
                                insert = CreateEdit(EditType.ins, insert_datetime, newRuns);

                            // Special case to deal with Page Number elements.
                            //if (parentElement.Name.LocalName.Equals("fldSimple"))
                            //    parentElement.AddBeforeSelf(insert);

                            else
                            {
                                // Split this run at the point you want to insert
                                XElement[] splitRun = Run.SplitRun(run, index);

                                // Replace the origional run
                                run.Xml.ReplaceWith
                                (
                                    splitRun[0],
                                    insert,
                                    splitRun[1]
                                );
                            }

                            break;
                        }
                }
            }

            HelperFunctions.RenumberIDs(Document);
        }

        /// <summary>
        /// For use with Append() and AppendLine()
        /// </summary>
        /// <returns>This Paragraph in curent culture</returns>
        /// <example>
        /// Add a new Paragraph with russian text to this document and then set language of text to local culture.
        /// <code>
        /// // Load a document.
        /// using (DocX document = DocX.Create(@"Test.docx"))
        /// {
        ///     // Insert a new Paragraph with russian text and set curent local culture to it.
        ///     Paragraph p = document.InsertParagraph("Привет мир!").CurentCulture();
        ///       
        ///     // Save this document.
        ///     document.Save();
        /// }
        /// </code>
        /// </example>
        public Paragraph CurentCulture()
        {
            ApplyTextFormattingProperty(XName.Get("lang", DocX.w.NamespaceName),
                string.Empty,
                new XAttribute(XName.Get("val", DocX.w.NamespaceName), CultureInfo.CurrentCulture.Name));
            return this;
        }

        /// <summary>
        /// For use with Append() and AppendLine()
        /// </summary>
        /// <param name="culture">The CultureInfo for text</param>
        /// <returns>This Paragraph in curent culture</returns>
        /// <example>
        /// Add a new Paragraph with russian text to this document and then set language of text to local culture.
        /// <code>
        /// // Load a document.
        /// using (DocX document = DocX.Create(@"Test.docx"))
        /// {
        ///     // Insert a new Paragraph with russian text and set specific culture to it.
        ///     Paragraph p = document.InsertParagraph("Привет мир").Culture(CultureInfo.CreateSpecificCulture("ru-RU"));
        ///       
        ///     // Save this document.
        ///     document.Save();
        /// }
        /// </code>
        /// </example>
        public Paragraph Culture(CultureInfo culture)
        {
            ApplyTextFormattingProperty(XName.Get("lang", DocX.w.NamespaceName), string.Empty,
                new XAttribute(XName.Get("val", DocX.w.NamespaceName), culture.Name));
            return this;
        }

        /// <summary>
        /// Append text to this Paragraph.
        /// </summary>
        /// <param name="text">The text to append.</param>
        /// <returns>This Paragraph with the new text appened.</returns>
        /// <example>
        /// Add a new Paragraph to this document and then append some text to it.
        /// <code>
        /// // Load a document.
        /// using (DocX document = DocX.Create(@"Test.docx"))
        /// {
        ///     // Insert a new Paragraph and Append some text to it.
        ///     Paragraph p = document.InsertParagraph().Append("Hello World!!!");
        ///       
        ///     // Save this document.
        ///     document.Save();
        /// }
        /// </code>
        /// </example>
        public Paragraph Append(string text)
        {
            List<XElement> newRuns = HelperFunctions.FormatInput(text, null);
            Xml.Add(newRuns);

            this.runs = Xml.Elements(XName.Get("r", DocX.w.NamespaceName)).Reverse().Take(newRuns.Count()).ToList();

            return this;
        }

        /// <summary>
        /// Append a hyperlink to a Paragraph.
        /// </summary>
        /// <param name="h">The hyperlink to append.</param>
        /// <returns>The Paragraph with the hyperlink appended.</returns>
        /// <example>
        /// Creates a Paragraph with some text and a hyperlink.
        /// <code>
        /// // Create a document.
        /// using (DocX document = DocX.Create(@"Test.docx"))
        /// {
        ///    // Add a hyperlink to this document.
        ///    Hyperlink h = document.AddHyperlink("Google", new Uri("http://www.google.com"));
        ///    
        ///    // Add a new Paragraph to this document.
        ///    Paragraph p = document.InsertParagraph();
        ///    p.Append("My favourite search engine is ");
        ///    p.AppendHyperlink(h);
        ///    p.Append(", I think it's great.");
        ///
        ///    // Save all changes made to this document.
        ///    document.Save();
        /// }
        /// </code>
        /// </example>
        public Paragraph AppendHyperlink(Hyperlink h)
        {
            // Convert the path of this mainPart to its equilivant rels file path.
            string path = mainPart.Uri.OriginalString.Replace("/word/", "");
            Uri rels_path = new Uri("/word/_rels/" + path + ".rels", UriKind.Relative);

            // Check to see if the rels file exists and create it if not.
            if (!Document.package.PartExists(rels_path))
                HelperFunctions.CreateRelsPackagePart(Document, rels_path);

            // Check to see if a rel for this Hyperlink exists, create it if not.
            var Id = GetOrGenerateRel(h);

            Xml.Add(h.Xml);
            Xml.Elements().Last().SetAttributeValue(DocX.r + "id", Id);

            this.runs = Xml.Elements().Last().Elements(XName.Get("r", DocX.w.NamespaceName)).ToList();

            return this;
        }

        /// <summary>
        /// Add an image to a document, create a custom view of that image (picture) and then insert it into a Paragraph using append.
        /// </summary>
        /// <param name="p">The Picture to append.</param>
        /// <returns>The Paragraph with the Picture now appended.</returns>
        /// <example>
        /// Add an image to a document, create a custom view of that image (picture) and then insert it into a Paragraph using append.
        /// <code>
        /// using (DocX document = DocX.Create("Test.docx"))
        /// {
        ///    // Add an image to the document. 
        ///    Image     i = document.AddImage(@"Image.jpg");
        ///    
        ///    // Create a picture i.e. (A custom view of an image)
        ///    Picture   p = i.CreatePicture();
        ///    p.FlipHorizontal = true;
        ///    p.Rotation = 10;
        ///
        ///    // Create a new Paragraph.
        ///    Paragraph par = document.InsertParagraph();
        ///    
        ///    // Append content to the Paragraph.
        ///    par.Append("Here is a cool picture")
        ///       .AppendPicture(p)
        ///       .Append(" don't you think so?");
        ///
        ///    // Save all changes made to this document.
        ///    document.Save();
        /// }
        /// </code>
        /// </example>
        public Paragraph AppendPicture(Picture p)
        {
            // Convert the path of this mainPart to its equilivant rels file path.
            string path = mainPart.Uri.OriginalString.Replace("/word/", "");
            Uri rels_path = new Uri("/word/_rels/" + path + ".rels", UriKind.Relative);

            // Check to see if the rels file exists and create it if not.
            if (!Document.package.PartExists(rels_path))
                HelperFunctions.CreateRelsPackagePart(Document, rels_path);

            // Check to see if a rel for this Picture exists, create it if not.
            var Id = GetOrGenerateRel(p);

            // Add the Picture Xml to the end of the Paragragraph Xml.
            Xml.Add(p.Xml);

            // Extract the attribute id from the Pictures Xml.
            XAttribute a_id =
            (
                from e in Xml.Elements().Last().Descendants()
                where e.Name.LocalName.Equals("blip")
                select e.Attribute(XName.Get("embed", "http://schemas.openxmlformats.org/officeDocument/2006/relationships"))
            ).Single();

            // Set its value to the Pictures relationships id.
            a_id.SetValue(Id);

            // For formatting such as .Bold()
            this.runs = Xml.Elements(XName.Get("r", DocX.w.NamespaceName)).Reverse().Take(p.Xml.Elements(XName.Get("r", DocX.w.NamespaceName)).Count()).ToList();

            return this;
        }

        /// <summary>
        /// Add an equation to a document.
        /// </summary>
        /// <param name="equation">The Equation to append.</param>
        /// <returns>The Paragraph with the Equation now appended.</returns>
        /// <example>
        /// Add an equation to a document.
        /// <code>
        /// using (DocX document = DocX.Create("Test.docx"))
        /// {
        ///    // Add an equation to the document. 
        ///    document.AddEquation("x=y+z");
        ///    
        ///    // Save all changes made to this document.
        ///    document.Save();
        /// }
        /// </code>
        /// </example>
        public Paragraph AppendEquation(String equation)
        {
            // Create equation element
            XElement oMathPara =
                new XElement
                (
                    XName.Get("oMathPara", DocX.m.NamespaceName),
                    new XElement
                    (
                        XName.Get("oMath", DocX.m.NamespaceName),
                        new XElement
                        (
                            XName.Get("r", DocX.w.NamespaceName),
                            new Formatting() { FontFamily = new System.Drawing.FontFamily("Cambria Math") }.Xml,    // create formatting
                            new XElement(XName.Get("t", DocX.m.NamespaceName), equation)                            // create equation string
                        )
                    )
                );

            // Add equation element into paragraph xml and update runs collection
            Xml.Add(oMathPara);
            runs = Xml.Elements(XName.Get("oMathPara", DocX.m.NamespaceName)).ToList();

            // Return paragraph with equation
            return this;
        }

        internal string GetOrGenerateRel(Picture p)
        {
            string image_uri_string = p.img.pr.TargetUri.OriginalString;

            // Search for a relationship with a TargetUri that points at this Image.
            var Id =
            (
                from r in mainPart.GetRelationshipsByType("http://schemas.openxmlformats.org/officeDocument/2006/relationships/image")
                where r.TargetUri.OriginalString == image_uri_string
                select r.Id
            ).SingleOrDefault();

            // If such a relation dosen't exist, create one.
            if (Id == null)
            {
                // Check to see if a relationship for this Picture exists and create it if not.
                PackageRelationship pr = mainPart.CreateRelationship(p.img.pr.TargetUri, TargetMode.Internal, "http://schemas.openxmlformats.org/officeDocument/2006/relationships/image");
                Id = pr.Id;
            }
            return Id;
        }

        internal string GetOrGenerateRel(Hyperlink h)
        {
            string image_uri_string = h.Uri.OriginalString;

            // Search for a relationship with a TargetUri that points at this Image.
            var Id =
            (
                from r in mainPart.GetRelationshipsByType("http://schemas.openxmlformats.org/officeDocument/2006/relationships/hyperlink")
                where r.TargetUri.OriginalString == image_uri_string
                select r.Id
            ).SingleOrDefault();

            // If such a relation dosen't exist, create one.
            if (Id == null)
            {
                // Check to see if a relationship for this Picture exists and create it if not.
                PackageRelationship pr = mainPart.CreateRelationship(h.Uri, TargetMode.External, "http://schemas.openxmlformats.org/officeDocument/2006/relationships/hyperlink");
                Id = pr.Id;
            }
            return Id;
        }

        /// <summary>
        /// Insert a Picture into a Paragraph at the given text index.
        /// If not index is provided defaults to 0.
        /// </summary>
        /// <param name="p">The Picture to insert.</param>
        /// <param name="index">The text index to insert at.</param>
        /// <returns>The modified Paragraph.</returns>
        /// <example>
        /// <code>
        ///Load test document.
        ///using (DocX document = DocX.Create("Test.docx"))
        ///{
        ///    // Add Headers and Footers into this document.
        ///    document.AddHeaders();
        ///    document.AddFooters();
        ///    document.DifferentFirstPage = true;
        ///    document.DifferentOddAndEvenPages = true;
        ///
        ///    // Add an Image to this document.
        ///    Novacode.Image img = document.AddImage(directory_documents + "purple.png");
        ///
        ///    // Create a Picture from this Image.
        ///    Picture pic = img.CreatePicture();
        ///
        ///    // Main document.
        ///    Paragraph p0 = document.InsertParagraph("Hello");
        ///    p0.InsertPicture(pic, 3);
        ///
        ///    // Header first.
        ///    Paragraph p1 = document.Headers.first.InsertParagraph("----");
        ///    p1.InsertPicture(pic, 2);
        ///
        ///    // Header odd.
        ///    Paragraph p2 = document.Headers.odd.InsertParagraph("----");
        ///    p2.InsertPicture(pic, 2);
        ///
        ///    // Header even.
        ///    Paragraph p3 = document.Headers.even.InsertParagraph("----");
        ///    p3.InsertPicture(pic, 2);
        ///
        ///    // Footer first.
        ///    Paragraph p4 = document.Footers.first.InsertParagraph("----");
        ///    p4.InsertPicture(pic, 2);
        ///
        ///    // Footer odd.
        ///    Paragraph p5 = document.Footers.odd.InsertParagraph("----");
        ///    p5.InsertPicture(pic, 2);
        ///
        ///    // Footer even.
        ///    Paragraph p6 = document.Footers.even.InsertParagraph("----");
        ///    p6.InsertPicture(pic, 2);
        ///
        ///    // Save this document.
        ///    document.Save();
        ///}
        /// </code>
        /// </example>
        public Paragraph InsertPicture(Picture p, int index = 0)
        {
            // Convert the path of this mainPart to its equilivant rels file path.
            string path = mainPart.Uri.OriginalString.Replace("/word/", "");
            Uri rels_path = new Uri("/word/_rels/" + path + ".rels", UriKind.Relative);

            // Check to see if the rels file exists and create it if not.
            if (!Document.package.PartExists(rels_path))
                HelperFunctions.CreateRelsPackagePart(Document, rels_path);

            // Check to see if a rel for this Picture exists, create it if not.
            var Id = GetOrGenerateRel(p);

            XElement p_xml;
            if (index == 0)
            {
                // Add this hyperlink as the last element.
                Xml.AddFirst(p.Xml);

                // Extract the picture back out of the DOM.
                p_xml = (XElement)Xml.FirstNode;
            }

            else
            {
                // Get the first run effected by this Insert
                Run run = GetFirstRunEffectedByEdit(index);

                if (run == null)
                {
                    // Add this picture as the last element.
                    Xml.Add(p.Xml);

                    // Extract the picture back out of the DOM.
                    p_xml = (XElement)Xml.LastNode;
                }

                else
                {
                    // Split this run at the point you want to insert
                    XElement[] splitRun = Run.SplitRun(run, index);

                    // Replace the origional run.
                    run.Xml.ReplaceWith
                    (
                        splitRun[0],
                        p.Xml,
                        splitRun[1]
                    );

                    // Get the first run effected by this Insert
                    run = GetFirstRunEffectedByEdit(index);

                    // The picture has to be the next element, extract it back out of the DOM.
                    p_xml = (XElement)run.Xml.NextNode;
                }

                // Extract the attribute id from the Pictures Xml.
                XAttribute a_id =
                (
                    from e in p_xml.Descendants()
                    where e.Name.LocalName.Equals("blip")
                    select e.Attribute(XName.Get("embed", "http://schemas.openxmlformats.org/officeDocument/2006/relationships"))
                ).Single();

                // Set its value to the Pictures relationships id.
                a_id.SetValue(Id);
            }

            return this;
        }

        /// <summary>
        /// Append text on a new line to this Paragraph.
        /// </summary>
        /// <param name="text">The text to append.</param>
        /// <returns>This Paragraph with the new text appened.</returns>
        /// <example>
        /// Add a new Paragraph to this document and then append a new line with some text to it.
        /// <code>
        /// // Load a document.
        /// using (DocX document = DocX.Create(@"Test.docx"))
        /// {
        ///     // Insert a new Paragraph and Append a new line with some text to it.
        ///     Paragraph p = document.InsertParagraph().AppendLine("Hello World!!!");
        ///       
        ///     // Save this document.
        ///     document.Save();
        /// }
        /// </code>
        /// </example>
        public Paragraph AppendLine(string text)
        {
            return Append("\n" + text);
        }

        /// <summary>
        /// Append a new line to this Paragraph.
        /// </summary>
        /// <returns>This Paragraph with a new line appeneded.</returns>
        /// <example>
        /// Add a new Paragraph to this document and then append a new line to it.
        /// <code>
        /// // Load a document.
        /// using (DocX document = DocX.Create(@"Test.docx"))
        /// {
        ///     // Insert a new Paragraph and Append a new line with some text to it.
        ///     Paragraph p = document.InsertParagraph().AppendLine();
        ///       
        ///     // Save this document.
        ///     document.Save();
        /// }
        /// </code>
        /// </example>
        public Paragraph AppendLine()
        {
            return Append("\n");
        }

        internal void ApplyTextFormattingProperty(XName textFormatPropName, string value, object content)
        {
            XElement rPr = null;

            if (runs.Count == 0)
            {
                XElement pPr = Xml.Element(XName.Get("pPr", DocX.w.NamespaceName));
                if (pPr == null)
                {
                    Xml.AddFirst(new XElement(XName.Get("pPr", DocX.w.NamespaceName)));
                    pPr = Xml.Element(XName.Get("pPr", DocX.w.NamespaceName));
                }

                rPr = pPr.Element(XName.Get("rPr", DocX.w.NamespaceName));
                if (rPr == null)
                {
                    pPr.AddFirst(new XElement(XName.Get("rPr", DocX.w.NamespaceName)));
                    rPr = pPr.Element(XName.Get("rPr", DocX.w.NamespaceName));
                }

                rPr.SetElementValue(textFormatPropName, value);
                return;
            }

          var contentIsListOfFontProperties = false;
          var fontProps = content as IEnumerable;
          if (fontProps != null)
          {
            foreach (object property in fontProps)
            {
              contentIsListOfFontProperties = (property as XAttribute != null);
            }
          }

            foreach (XElement run in runs)
            {
                rPr = run.Element(XName.Get("rPr", DocX.w.NamespaceName));
                if (rPr == null)
                {
                    run.AddFirst(new XElement(XName.Get("rPr", DocX.w.NamespaceName)));
                    rPr = run.Element(XName.Get("rPr", DocX.w.NamespaceName));
                }

                rPr.SetElementValue(textFormatPropName, value);
                XElement last = rPr.Elements().Last();

              if (contentIsListOfFontProperties) //if content is a list of attributes, as in the case when specifying a font family 
              {
                foreach (object property in fontProps)
                {
                  if (last.Attribute(((System.Xml.Linq.XAttribute) (property)).Name) == null)
                  {
                    last.Add(property); //Add this attribute if element doesn't have it
                  }
                  else
                  {
                    last.Attribute(((System.Xml.Linq.XAttribute) (property)).Name).Value =
                      ((System.Xml.Linq.XAttribute) (property)).Value; //Apply value only if element already has it
                  }
                }
              }

                if (content as System.Xml.Linq.XAttribute != null)//If content is an attribute
                {
                    if (last.Attribute(((System.Xml.Linq.XAttribute)(content)).Name) == null)
                    {
                        last.Add(content); //Add this attribute if element doesn't have it
                    }
                    else
                    {
                        last.Attribute(((System.Xml.Linq.XAttribute)(content)).Name).Value = ((System.Xml.Linq.XAttribute)(content)).Value; //Apply value only if element already has it
                    }
                }
                else
                {
                    //IMPORTANT
                    //But what to do if it is not?
                }
            }
        }

        /// <summary>
        /// For use with Append() and AppendLine()
        /// </summary>
        /// <returns>This Paragraph with the last appended text bold.</returns>
        /// <example>
        /// Append text to this Paragraph and then make it bold.
        /// <code>
        /// // Create a document.
        /// using (DocX document = DocX.Create(@"Test.docx"))
        /// {
        ///     // Insert a new Paragraph.
        ///     Paragraph p = document.InsertParagraph();
        ///
        ///     p.Append("I am ")
        ///     .Append("Bold").Bold()
        ///     .Append(" I am not");
        ///        
        ///     // Save this document.
        ///     document.Save();
        /// }// Release this document from memory.
        /// </code>
        /// </example>
        public Paragraph Bold()
        {
            ApplyTextFormattingProperty(XName.Get("b", DocX.w.NamespaceName), string.Empty, null);
            return this;
        }

        /// <summary>
        /// For use with Append() and AppendLine()
        /// </summary>
        /// <returns>This Paragraph with the last appended text italic.</returns>
        /// <example>
        /// Append text to this Paragraph and then make it italic.
        /// <code>
        /// // Create a document.
        /// using (DocX document = DocX.Create(@"Test.docx"))
        /// {
        ///     // Insert a new Paragraph.
        ///     Paragraph p = document.InsertParagraph();
        ///
        ///     p.Append("I am ")
        ///     .Append("Italic").Italic()
        ///     .Append(" I am not");
        ///        
        ///     // Save this document.
        ///     document.Save();
        /// }// Release this document from memory.
        /// </code>
        /// </example>
        public Paragraph Italic()
        {
            ApplyTextFormattingProperty(XName.Get("i", DocX.w.NamespaceName), string.Empty, null);
            return this;
        }

        /// <summary>
        /// For use with Append() and AppendLine()
        /// </summary>
        /// <param name="c">A color to use on the appended text.</param>
        /// <returns>This Paragraph with the last appended text colored.</returns>
        /// <example>
        /// Append text to this Paragraph and then color it.
        /// <code>
        /// // Create a document.
        /// using (DocX document = DocX.Create(@"Test.docx"))
        /// {
        ///     // Insert a new Paragraph.
        ///     Paragraph p = document.InsertParagraph();
        ///
        ///     p.Append("I am ")
        ///     .Append("Blue").Color(Color.Blue)
        ///     .Append(" I am not");
        ///        
        ///     // Save this document.
        ///     document.Save();
        /// }// Release this document from memory.
        /// </code>
        /// </example>
        public Paragraph Color(Color c)
        {
            ApplyTextFormattingProperty(XName.Get("color", DocX.w.NamespaceName), string.Empty, new XAttribute(XName.Get("val", DocX.w.NamespaceName), c.ToHex()));
            return this;
        }

        /// <summary>
        /// For use with Append() and AppendLine()
        /// </summary>
        /// <param name="underlineStyle">The underline style to use for the appended text.</param>
        /// <returns>This Paragraph with the last appended text underlined.</returns>
        /// <example>
        /// Append text to this Paragraph and then underline it.
        /// <code>
        /// // Create a document.
        /// using (DocX document = DocX.Create(@"Test.docx"))
        /// {
        ///     // Insert a new Paragraph.
        ///     Paragraph p = document.InsertParagraph();
        ///
        ///     p.Append("I am ")
        ///     .Append("Underlined").UnderlineStyle(UnderlineStyle.doubleLine)
        ///     .Append(" I am not");
        ///        
        ///     // Save this document.
        ///     document.Save();
        /// }// Release this document from memory.
        /// </code>
        /// </example>
        public Paragraph UnderlineStyle(UnderlineStyle underlineStyle)
        {
            string value;
            switch (underlineStyle)
            {
                case Novacode.UnderlineStyle.none: value = string.Empty; break;
                case Novacode.UnderlineStyle.singleLine: value = "single"; break;
                case Novacode.UnderlineStyle.doubleLine: value = "double"; break;
                default: value = underlineStyle.ToString(); break;
            }

            ApplyTextFormattingProperty(XName.Get("u", DocX.w.NamespaceName), string.Empty, new XAttribute(XName.Get("val", DocX.w.NamespaceName), value));
            return this;
        }

        private Table followingTable;

        ///<summary>
        /// Returns table following the paragraph. Null if the following element isn't table.
        ///</summary>
        public Table FollowingTable
        {
            get
            {
                return followingTable;
            }
            internal set
            {
                followingTable = value;
            }
        }

        /// <summary>
        /// For use with Append() and AppendLine()
        /// </summary>
        /// <param name="fontSize">The font size to use for the appended text.</param>
        /// <returns>This Paragraph with the last appended text resized.</returns>
        /// <example>
        /// Append text to this Paragraph and then resize it.
        /// <code>
        /// // Create a document.
        /// using (DocX document = DocX.Create(@"Test.docx"))
        /// {
        ///     // Insert a new Paragraph.
        ///     Paragraph p = document.InsertParagraph();
        ///
        ///     p.Append("I am ")
        ///     .Append("Big").FontSize(20)
        ///     .Append(" I am not");
        ///        
        ///     // Save this document.
        ///     document.Save();
        /// }// Release this document from memory.
        /// </code>
        /// </example>
        public Paragraph FontSize(double fontSize)
        {
            if (fontSize - (int)fontSize == 0)
            {
                if (!(fontSize > 0 && fontSize < 1639))
                    throw new ArgumentException("Size", "Value must be in the range 0 - 1638");
            }

            else
                throw new ArgumentException("Size", "Value must be either a whole or half number, examples: 32, 32.5");

            ApplyTextFormattingProperty(XName.Get("sz", DocX.w.NamespaceName), string.Empty, new XAttribute(XName.Get("val", DocX.w.NamespaceName), fontSize * 2));
            ApplyTextFormattingProperty(XName.Get("szCs", DocX.w.NamespaceName), string.Empty, new XAttribute(XName.Get("val", DocX.w.NamespaceName), fontSize * 2));

            return this;
        }

        /// <summary>
        /// For use with Append() and AppendLine()
        /// </summary>
        /// <param name="fontFamily">The font to use for the appended text.</param>
        /// <returns>This Paragraph with the last appended text's font changed.</returns>
        /// <example>
        /// Append text to this Paragraph and then change its font.
        /// <code>
        /// // Create a document.
        /// using (DocX document = DocX.Create(@"Test.docx"))
        /// {
        ///     // Insert a new Paragraph.
        ///     Paragraph p = document.InsertParagraph();
        ///
        ///     p.Append("I am ")
        ///     .Append("Times new roman").Font(new FontFamily("Times new roman"))
        ///     .Append(" I am not");
        ///        
        ///     // Save this document.
        ///     document.Save();
        /// }// Release this document from memory.
        /// </code>
        /// </example>
        public Paragraph Font(FontFamily fontFamily)
        {
            ApplyTextFormattingProperty
            (
                XName.Get("rFonts", DocX.w.NamespaceName),
                string.Empty,
                new[] 
                {
                    new XAttribute(XName.Get("ascii", DocX.w.NamespaceName), fontFamily.Name),
                    new XAttribute(XName.Get("hAnsi", DocX.w.NamespaceName), fontFamily.Name), // Added by Maurits Elbers to support non-standard characters. See http://docx.codeplex.com/Thread/View.aspx?ThreadId=70097&ANCHOR#Post453865
                    new XAttribute(XName.Get("cs", DocX.w.NamespaceName), fontFamily.Name),    // Added by Maurits Elbers to support non-standard characters. See http://docx.codeplex.com/Thread/View.aspx?ThreadId=70097&ANCHOR#Post453865
                }
            );

            return this;
        }

        /// <summary>
        /// For use with Append() and AppendLine()
        /// </summary>
        /// <param name="capsStyle">The caps style to apply to the last appended text.</param>
        /// <returns>This Paragraph with the last appended text's caps style changed.</returns>
        /// <example>
        /// Append text to this Paragraph and then set it to full caps.
        /// <code>
        /// // Create a document.
        /// using (DocX document = DocX.Create(@"Test.docx"))
        /// {
        ///     // Insert a new Paragraph.
        ///     Paragraph p = document.InsertParagraph();
        ///
        ///     p.Append("I am ")
        ///     .Append("Capitalized").CapsStyle(CapsStyle.caps)
        ///     .Append(" I am not");
        ///        
        ///     // Save this document.
        ///     document.Save();
        /// }// Release this document from memory.
        /// </code>
        /// </example>
        public Paragraph CapsStyle(CapsStyle capsStyle)
        {
            switch (capsStyle)
            {
                case Novacode.CapsStyle.none:
                    break;

                default:
                    {
                        ApplyTextFormattingProperty(XName.Get(capsStyle.ToString(), DocX.w.NamespaceName), string.Empty, null);
                        break;
                    }
            }

            return this;
        }

        /// <summary>
        /// For use with Append() and AppendLine()
        /// </summary>
        /// <param name="script">The script style to apply to the last appended text.</param>
        /// <returns>This Paragraph with the last appended text's script style changed.</returns>
        /// <example>
        /// Append text to this Paragraph and then set it to superscript.
        /// <code>
        /// // Create a document.
        /// using (DocX document = DocX.Create(@"Test.docx"))
        /// {
        ///     // Insert a new Paragraph.
        ///     Paragraph p = document.InsertParagraph();
        ///
        ///     p.Append("I am ")
        ///     .Append("superscript").Script(Script.superscript)
        ///     .Append(" I am not");
        ///        
        ///     // Save this document.
        ///     document.Save();
        /// }// Release this document from memory.
        /// </code>
        /// </example>
        public Paragraph Script(Script script)
        {
            switch (script)
            {
                case Novacode.Script.none:
                    break;

                default:
                    {
                        ApplyTextFormattingProperty(XName.Get("vertAlign", DocX.w.NamespaceName), string.Empty, new XAttribute(XName.Get("val", DocX.w.NamespaceName), script.ToString()));
                        break;
                    }
            }

            return this;
        }

        /// <summary>
        /// For use with Append() and AppendLine()
        /// </summary>
        ///<param name="highlight">The highlight to apply to the last appended text.</param>
        /// <returns>This Paragraph with the last appended text highlighted.</returns>
        /// <example>
        /// Append text to this Paragraph and then highlight it.
        /// <code>
        /// // Create a document.
        /// using (DocX document = DocX.Create(@"Test.docx"))
        /// {
        ///     // Insert a new Paragraph.
        ///     Paragraph p = document.InsertParagraph();
        ///
        ///     p.Append("I am ")
        ///     .Append("highlighted").Highlight(Highlight.green)
        ///     .Append(" I am not");
        ///        
        ///     // Save this document.
        ///     document.Save();
        /// }// Release this document from memory.
        /// </code>
        /// </example>
        public Paragraph Highlight(Highlight highlight)
        {
            switch (highlight)
            {
                case Novacode.Highlight.none:
                    break;

                default:
                    {
                        ApplyTextFormattingProperty(XName.Get("highlight", DocX.w.NamespaceName), string.Empty, new XAttribute(XName.Get("val", DocX.w.NamespaceName), highlight.ToString()));
                        break;
                    }
            }

            return this;
        }

        /// <summary>
        /// For use with Append() and AppendLine()
        /// </summary>
        /// <param name="misc">The miscellaneous property to set.</param>
        /// <returns>This Paragraph with the last appended text changed by a miscellaneous property.</returns>
        /// <example>
        /// Append text to this Paragraph and then apply a miscellaneous property.
        /// <code>
        /// // Create a document.
        /// using (DocX document = DocX.Create(@"Test.docx"))
        /// {
        ///     // Insert a new Paragraph.
        ///     Paragraph p = document.InsertParagraph();
        ///
        ///     p.Append("I am ")
        ///     .Append("outlined").Misc(Misc.outline)
        ///     .Append(" I am not");
        ///        
        ///     // Save this document.
        ///     document.Save();
        /// }// Release this document from memory.
        /// </code>
        /// </example>
        public Paragraph Misc(Misc misc)
        {
            switch (misc)
            {
                case Novacode.Misc.none:
                    break;

                case Novacode.Misc.outlineShadow:
                    {
                        ApplyTextFormattingProperty(XName.Get("outline", DocX.w.NamespaceName), string.Empty, null);
                        ApplyTextFormattingProperty(XName.Get("shadow", DocX.w.NamespaceName), string.Empty, null);

                        break;
                    }

                case Novacode.Misc.engrave:
                    {
                        ApplyTextFormattingProperty(XName.Get("imprint", DocX.w.NamespaceName), string.Empty, null);

                        break;
                    }

                default:
                    {
                        ApplyTextFormattingProperty(XName.Get(misc.ToString(), DocX.w.NamespaceName), string.Empty, null);

                        break;
                    }
            }

            return this;
        }

        /// <summary>
        /// For use with Append() and AppendLine()
        /// </summary>
        /// <param name="strikeThrough">The strike through style to used on the last appended text.</param>
        /// <returns>This Paragraph with the last appended text striked.</returns>
        /// <example>
        /// Append text to this Paragraph and then strike it.
        /// <code>
        /// // Create a document.
        /// using (DocX document = DocX.Create(@"Test.docx"))
        /// {
        ///     // Insert a new Paragraph.
        ///     Paragraph p = document.InsertParagraph();
        ///
        ///     p.Append("I am ")
        ///     .Append("striked").StrikeThrough(StrikeThrough.doubleStrike)
        ///     .Append(" I am not");
        ///        
        ///     // Save this document.
        ///     document.Save();
        /// }// Release this document from memory.
        /// </code>
        /// </example>
        public Paragraph StrikeThrough(StrikeThrough strikeThrough)
        {
            string value;
            switch (strikeThrough)
            {
                case Novacode.StrikeThrough.strike: value = "strike"; break;
                case Novacode.StrikeThrough.doubleStrike: value = "dstrike"; break;
                default: return this;
            }

            ApplyTextFormattingProperty(XName.Get(value, DocX.w.NamespaceName), string.Empty, null);

            return this;
        }

        /// <summary>
        /// For use with Append() and AppendLine()
        /// </summary>
        /// <param name="underlineColor">The underline color to use, if no underline is set, a single line will be used.</param>
        /// <returns>This Paragraph with the last appended text underlined in a color.</returns>
        /// <example>
        /// Append text to this Paragraph and then underline it using a color.
        /// <code>
        /// // Create a document.
        /// using (DocX document = DocX.Create(@"Test.docx"))
        /// {
        ///     // Insert a new Paragraph.
        ///     Paragraph p = document.InsertParagraph();
        ///
        ///     p.Append("I am ")
        ///     .Append("color underlined").UnderlineStyle(UnderlineStyle.dotted).UnderlineColor(Color.Orange)
        ///     .Append(" I am not");
        ///        
        ///     // Save this document.
        ///     document.Save();
        /// }// Release this document from memory.
        /// </code>
        /// </example>
        public Paragraph UnderlineColor(Color underlineColor)
        {
            foreach (XElement run in runs)
            {
                XElement rPr = run.Element(XName.Get("rPr", DocX.w.NamespaceName));
                if (rPr == null)
                {
                    run.AddFirst(new XElement(XName.Get("rPr", DocX.w.NamespaceName)));
                    rPr = run.Element(XName.Get("rPr", DocX.w.NamespaceName));
                }

                XElement u = rPr.Element(XName.Get("u", DocX.w.NamespaceName));
                if (u == null)
                {
                    rPr.SetElementValue(XName.Get("u", DocX.w.NamespaceName), string.Empty);
                    u = rPr.Element(XName.Get("u", DocX.w.NamespaceName));
                    u.SetAttributeValue(XName.Get("val", DocX.w.NamespaceName), "single");
                }

                u.SetAttributeValue(XName.Get("color", DocX.w.NamespaceName), underlineColor.ToHex());
            }

            return this;
        }

        /// <summary>
        /// For use with Append() and AppendLine()
        /// </summary>
        /// <returns>This Paragraph with the last appended text hidden.</returns>
        /// <example>
        /// Append text to this Paragraph and then hide it.
        /// <code>
        /// // Create a document.
        /// using (DocX document = DocX.Create(@"Test.docx"))
        /// {
        ///     // Insert a new Paragraph.
        ///     Paragraph p = document.InsertParagraph();
        ///
        ///     p.Append("I am ")
        ///     .Append("hidden").Hide()
        ///     .Append(" I am not");
        ///        
        ///     // Save this document.
        ///     document.Save();
        /// }// Release this document from memory.
        /// </code>
        /// </example>
        public Paragraph Hide()
        {
            ApplyTextFormattingProperty(XName.Get("vanish", DocX.w.NamespaceName), string.Empty, null);

            return this;
        }

        public float LineSpacing
        {
            get
            {
                XElement pPr = GetOrCreate_pPr();
                XElement spacing = pPr.Element(XName.Get("spacing", DocX.w.NamespaceName));

                if (spacing != null)
                {
                    XAttribute line = spacing.Attribute(XName.Get("line", DocX.w.NamespaceName));
                    if (line != null)
                    {
                        float f;

                        if (float.TryParse(line.Value, out f))
                            return f / 20.0f;
                    }
                }

                return 1.1f * 20.0f;
            }

            set
            {
                Spacing(value);
            }
        }

        public Paragraph Spacing(double spacing)
        {
            spacing *= 20;

            if (spacing - (int)spacing == 0)
            {
                if (!(spacing > -1585 && spacing < 1585))
                    throw new ArgumentException("Spacing", "Value must be in the range: -1584 - 1584");
            }

            else
                throw new ArgumentException("Spacing", "Value must be either a whole or acurate to one decimal, examples: 32, 32.1, 32.2, 32.9");

            ApplyTextFormattingProperty(XName.Get("spacing", DocX.w.NamespaceName), string.Empty, new XAttribute(XName.Get("val", DocX.w.NamespaceName), spacing));

            return this;
        }

        public Paragraph SpacingBefore(double spacingBefore)
        {
            spacingBefore *= 20;

            if (spacingBefore - (int)spacingBefore == 0)
            {
                if (!(spacingBefore > -1585 && spacingBefore < 1585))
                    throw new ArgumentException("SpacingBefore", "Value must be in the range: -1584 - 1584");
            }

            else
                throw new ArgumentException("SpacingBefore", "Value must be either a whole or acurate to one decimal, examples: 32, 32.1, 32.2, 32.9");

            ApplyTextFormattingProperty(XName.Get("before", DocX.w.NamespaceName), string.Empty, new XAttribute(XName.Get("val", DocX.w.NamespaceName), spacingBefore));

            return this;
        }

        public Paragraph SpacingAfter(double spacingAfter)
        {
            spacingAfter *= 20;

            if (spacingAfter - (int)spacingAfter == 0)
            {
                if (!(spacingAfter > -1585 && spacingAfter < 1585))
                    throw new ArgumentException("SpacingAfter", "Value must be in the range: -1584 - 1584");
            }

            else
                throw new ArgumentException("SpacingAfter", "Value must be either a whole or acurate to one decimal, examples: 32, 32.1, 32.2, 32.9");

            ApplyTextFormattingProperty(XName.Get("after", DocX.w.NamespaceName), string.Empty, new XAttribute(XName.Get("val", DocX.w.NamespaceName), spacingAfter));

            return this;
        }

        public Paragraph Kerning(int kerning)
        {
            if (!new int?[] { 8, 9, 10, 11, 12, 14, 16, 18, 20, 22, 24, 26, 28, 36, 48, 72 }.Contains(kerning))
                throw new ArgumentOutOfRangeException("Kerning", "Value must be one of the following: 8, 9, 10, 11, 12, 14, 16, 18, 20, 22, 24, 26, 28, 36, 48 or 72");

            ApplyTextFormattingProperty(XName.Get("kern", DocX.w.NamespaceName), string.Empty, new XAttribute(XName.Get("val", DocX.w.NamespaceName), kerning * 2));
            return this;
        }

        public Paragraph Position(double position)
        {
            if (!(position > -1585 && position < 1585))
                throw new ArgumentOutOfRangeException("Position", "Value must be in the range -1585 - 1585");

            ApplyTextFormattingProperty(XName.Get("position", DocX.w.NamespaceName), string.Empty, new XAttribute(XName.Get("val", DocX.w.NamespaceName), position * 2));

            return this;
        }

        public Paragraph PercentageScale(int percentageScale)
        {
            if (!(new int?[] { 200, 150, 100, 90, 80, 66, 50, 33 }).Contains(percentageScale))
                throw new ArgumentOutOfRangeException("PercentageScale", "Value must be one of the following: 200, 150, 100, 90, 80, 66, 50 or 33");

            ApplyTextFormattingProperty(XName.Get("w", DocX.w.NamespaceName), string.Empty, new XAttribute(XName.Get("val", DocX.w.NamespaceName), percentageScale));

            return this;
        }

        /// <summary>
        /// Append a field of type document property, this field will display the custom property cp, at the end of this paragraph.
        /// </summary>
        /// <param name="cp">The custom property to display.</param>
        /// <param name="f">The formatting to use for this text.</param>
        /// <example>
        /// Create, add and display a custom property in a document.
        /// <code>
        ///// Load a document.
        ///using (DocX document = DocX.Create("CustomProperty_Add.docx"))
        ///{
        ///    // Add a few Custom Properties to this document.
        ///    document.AddCustomProperty(new CustomProperty("fname", "cathal"));
        ///    document.AddCustomProperty(new CustomProperty("age", 24));
        ///    document.AddCustomProperty(new CustomProperty("male", true));
        ///    document.AddCustomProperty(new CustomProperty("newyear2012", new DateTime(2012, 1, 1)));
        ///    document.AddCustomProperty(new CustomProperty("fav_num", 3.141592));
        ///
        ///    // Insert a new Paragraph and append a load of DocProperties.
        ///    Paragraph p = document.InsertParagraph("fname: ")
        ///        .AppendDocProperty(document.CustomProperties["fname"])
        ///        .Append(", age: ")
        ///        .AppendDocProperty(document.CustomProperties["age"])
        ///        .Append(", male: ")
        ///        .AppendDocProperty(document.CustomProperties["male"])
        ///        .Append(", newyear2012: ")
        ///        .AppendDocProperty(document.CustomProperties["newyear2012"])
        ///        .Append(", fav_num: ")
        ///        .AppendDocProperty(document.CustomProperties["fav_num"]);
        ///    
        ///    // Save the changes to the document.
        ///    document.Save();
        ///}
        /// </code>
        /// </example>
        public Paragraph AppendDocProperty(CustomProperty cp, bool trackChanges = false, Formatting f = null)
        {
            this.InsertDocProperty(cp, trackChanges, f);
            return this;
        }

        /// <summary>
        /// Insert a field of type document property, this field will display the custom property cp, at the end of this paragraph.
        /// </summary>
        /// <param name="cp">The custom property to display.</param>
        /// <param name="f">The formatting to use for this text.</param>
        /// <example>
        /// Create, add and display a custom property in a document.
        /// <code>
        /// // Load a document
        /// using (DocX document = DocX.Create(@"Test.docx"))
        /// {
        ///     // Create a custom property.
        ///     CustomProperty name = new CustomProperty("name", "Cathal Coffey");
        ///        
        ///     // Add this custom property to this document.
        ///     document.AddCustomProperty(name);
        ///
        ///     // Create a text formatting.
        ///     Formatting f = new Formatting();
        ///     f.Bold = true;
        ///     f.Size = 14;
        ///     f.StrikeThrough = StrickThrough.strike;
        ///
        ///     // Insert a new paragraph.
        ///     Paragraph p = document.InsertParagraph("Author: ", false, f);
        ///
        ///     // Insert a field of type document property to display the custom property name and track this change.
        ///     p.InsertDocProperty(name, true, f);
        ///
        ///     // Save all changes made to this document.
        ///     document.Save();
        /// }// Release this document from memory.
        /// </code>
        /// </example>
        public DocProperty InsertDocProperty(CustomProperty cp, bool trackChanges = false, Formatting f = null)
        {
            XElement f_xml = null;
            if (f != null)
                f_xml = f.Xml;

            XElement e = new XElement
            (
                XName.Get("fldSimple", DocX.w.NamespaceName),
                new XAttribute(XName.Get("instr", DocX.w.NamespaceName), string.Format(@"DOCPROPERTY {0} \* MERGEFORMAT", cp.Name)),
                    new XElement(XName.Get("r", DocX.w.NamespaceName),
                        new XElement(XName.Get("t", DocX.w.NamespaceName), f_xml, cp.Value))
            );

            XElement xml = e;
            if (trackChanges)
            {
                DateTime now = DateTime.Now;
                DateTime insert_datetime = new DateTime(now.Year, now.Month, now.Day, now.Hour, now.Minute, 0, DateTimeKind.Utc);
                e = CreateEdit(EditType.ins, insert_datetime, e);
            }

            Xml.Add(e);

            return new DocProperty(Document, xml);
        }

        /// <summary>
        /// Removes characters from a Novacode.DocX.Paragraph.
        /// </summary>
        /// <example>
        /// <code>
        /// // Create a document using a relative filename.
        /// using (DocX document = DocX.Load(@"C:\Example\Test.docx"))
        /// {
        ///     // Iterate through the paragraphs
        ///     foreach (Paragraph p in document.Paragraphs)
        ///     {
        ///         // Remove the first two characters from every paragraph
        ///         p.RemoveText(0, 2, false);
        ///     }
        ///        
        ///     // Save all changes made to this document.
        ///     document.Save();
        /// }// Release this document from memory.
        /// </code>
        /// </example>
        /// <seealso cref="Paragraph.ReplaceText(string, string, bool)"/>
        /// <seealso cref="Paragraph.ReplaceText(string, string, bool, RegexOptions)"/>
        /// <seealso cref="Paragraph.InsertText(string, bool)"/>
        /// <seealso cref="Paragraph.InsertText(int, string, bool)"/>
        /// <seealso cref="Paragraph.InsertText(int, string, bool, Formatting)"/>
        /// <seealso cref="Paragraph.InsertText(string, bool, Formatting)"/>
        /// <param name="index">The position to begin deleting characters.</param>
        /// <param name="count">The number of characters to delete</param>
        /// <param name="trackChanges">Track changes</param>
        public void RemoveText(int index, int count, bool trackChanges = false)
        {
            // Timestamp to mark the start of insert
            DateTime now = DateTime.Now;
            DateTime remove_datetime = new DateTime(now.Year, now.Month, now.Day, now.Hour, now.Minute, 0, DateTimeKind.Utc);

            // The number of characters processed so far
            int processed = 0;

            do
            {
                // Get the first run effected by this Remove
                Run run = GetFirstRunEffectedByEdit(index, EditType.del);

                // The parent of this Run
                XElement parentElement = run.Xml.Parent;
                switch (parentElement.Name.LocalName)
                {
                    case "ins":
                        {
                            XElement[] splitEditBefore = SplitEdit(parentElement, index, EditType.del);
                            int min = Math.Min(count - processed, run.Xml.ElementsAfterSelf().Sum(e => GetElementTextLength(e)));
                            XElement[] splitEditAfter = SplitEdit(parentElement, index + min, EditType.del);

                            XElement temp = SplitEdit(splitEditBefore[1], index + min, EditType.del)[0];
                            object middle = CreateEdit(EditType.del, remove_datetime, temp.Elements());
                            processed += GetElementTextLength(middle as XElement);

                            if (!trackChanges)
                                middle = null;

                            parentElement.ReplaceWith
                            (
                                splitEditBefore[0],
                                middle,
                                splitEditAfter[1]
                            );

                            processed += GetElementTextLength(middle as XElement);
                            break;
                        }

                    case "del":
                        {
                            if (trackChanges)
                            {
                                // You cannot delete from a deletion, advance processed to the end of this del
                                processed += GetElementTextLength(parentElement);
                            }

                            else
                                goto case "ins";

                            break;
                        }

                    default:
                        {
                            XElement[] splitRunBefore = Run.SplitRun(run, index, EditType.del);
                            int min = Math.Min(index + processed + (count - processed), run.EndIndex);
                            XElement[] splitRunAfter = Run.SplitRun(run, min, EditType.del);

                            object middle = CreateEdit(EditType.del, remove_datetime, new List<XElement>() { Run.SplitRun(new Run(Document, splitRunBefore[1], run.StartIndex + GetElementTextLength(splitRunBefore[0])), min, EditType.del)[0] });
                            processed += GetElementTextLength(middle as XElement);

                            if (!trackChanges)
                                middle = null;

                            run.Xml.ReplaceWith
                            (
                                splitRunBefore[0],
                                middle,
                                splitRunAfter[1]
                            );

                            break;
                        }
                }

                // If after this remove the parent element is empty, remove it.
                if (GetElementTextLength(parentElement) == 0)
                {
                    if (parentElement.Parent != null && parentElement.Parent.Name.LocalName != "tc")
                    {
                        // Need to make sure there is no drawing element within the parent element.
                        // Picture elements contain no text length but they are still content.
                        if (parentElement.Descendants(XName.Get("drawing", DocX.w.NamespaceName)).Count() == 0)
                            parentElement.Remove();
                    }
                }
            }
            while (processed < count);

            HelperFunctions.RenumberIDs(Document);
        }


        /// <summary>
        /// Removes characters from a Novacode.DocX.Paragraph.
        /// </summary>
        /// <example>
        /// <code>
        /// // Create a document using a relative filename.
        /// using (DocX document = DocX.Load(@"C:\Example\Test.docx"))
        /// {
        ///     // Iterate through the paragraphs
        ///     foreach (Paragraph p in document.Paragraphs)
        ///     {
        ///         // Remove all but the first 2 characters from this Paragraph.
        ///         p.RemoveText(2, false);
        ///     }
        ///        
        ///     // Save all changes made to this document.
        ///     document.Save();
        /// }// Release this document from memory.
        /// </code>
        /// </example>
        /// <seealso cref="Paragraph.ReplaceText(string, string, bool)"/>
        /// <seealso cref="Paragraph.ReplaceText(string, string, bool, RegexOptions)"/>
        /// <seealso cref="Paragraph.InsertText(int, string, bool, Formatting)"/>
        /// <seealso cref="Paragraph.InsertText(string, bool, Formatting)"/>
        /// <param name="index">The position to begin deleting characters.</param>
        /// <param name="trackChanges">Track changes</param>
        public void RemoveText(int index, bool trackChanges = false)
        {
            RemoveText(index, Text.Length - index, trackChanges);
        }

        /// <summary>
        /// Replaces all occurrences of a specified System.String in this instance, with another specified System.String.
        /// </summary>
        /// <example>
        /// <code>
        /// // Load a document using a relative filename.
        /// using (DocX document = DocX.Load(@"C:\Example\Test.docx"))
        /// {
        ///     // The formatting to match.
        ///     Formatting matchFormatting = new Formatting();
        ///     matchFormatting.Size = 10;
        ///     matchFormatting.Italic = true;
        ///     matchFormatting.FontFamily = new FontFamily("Times New Roman");
        ///
        ///     // The formatting to apply to the inserted text.
        ///     Formatting newFormatting = new Formatting();
        ///     newFormatting.Size = 22;
        ///     newFormatting.UnderlineStyle = UnderlineStyle.dotted;
        ///     newFormatting.Bold = true;
        ///
        ///     // Iterate through the paragraphs in this document.
        ///     foreach (Paragraph p in document.Paragraphs)
        ///     {
        ///         /* 
        ///          * Replace all instances of the string "wrong" with the string "right" and ignore case.
        ///          * Each inserted instance of "wrong" should use the Formatting newFormatting.
        ///          * Only replace an instance of "wrong" if it is Size 10, Italic and Times New Roman.
        ///          * SubsetMatch means that the formatting must contain all elements of the match formatting,
        ///          * but it can also contain additional formatting for example Color, UnderlineStyle, etc.
        ///          * ExactMatch means it must not contain additional formatting.
        ///          */
        ///         p.ReplaceText("wrong", "right", false, RegexOptions.IgnoreCase, newFormatting, matchFormatting, MatchFormattingOptions.SubsetMatch);
        ///     }
        ///
        ///     // Save all changes made to this document.
        ///     document.Save();
        /// }// Release this document from memory.
        /// </code>
        /// </example>
        /// <seealso cref="Paragraph.RemoveText(int, int, bool)"/>
        /// <seealso cref="Paragraph.RemoveText(int, bool)"/>
        /// <seealso cref="Paragraph.InsertText(string, bool)"/>
        /// <seealso cref="Paragraph.InsertText(int, string, bool)"/>
        /// <seealso cref="Paragraph.InsertText(int, string, bool, Formatting)"/>
        /// <seealso cref="Paragraph.InsertText(string, bool, Formatting)"/>
        /// <param name="newValue">A System.String to replace all occurances of oldValue.</param>
        /// <param name="oldValue">A System.String to be replaced.</param>
        /// <param name="options">A bitwise OR combination of RegexOption enumeration options.</param>
        /// <param name="trackChanges">Track changes</param>
        /// <param name="newFormatting">The formatting to apply to the text being inserted.</param>
        /// <param name="matchFormatting">The formatting that the text must match in order to be replaced.</param>
        /// <param name="fo">How should formatting be matched?</param>
        public void ReplaceText(string oldValue, string newValue, bool trackChanges = false, RegexOptions options = RegexOptions.None, Formatting newFormatting = null, Formatting matchFormatting = null, MatchFormattingOptions fo = MatchFormattingOptions.SubsetMatch)
        {
            MatchCollection mc = Regex.Matches(this.Text, Regex.Escape(oldValue), options);

            // Loop through the matches in reverse order
            foreach (Match m in mc.Cast<Match>().Reverse())
            {
                // Assume the formatting matches until proven otherwise.
                bool formattingMatch = true;

                // Does the user want to match formatting?
                if (matchFormatting != null)
                {
                    // The number of characters processed so far
                    int processed = 0;

                    do
                    {
                        // Get the next run effected
                        Run run = GetFirstRunEffectedByEdit(m.Index + processed);

                        // Get this runs properties
                        XElement rPr = run.Xml.Element(XName.Get("rPr", DocX.w.NamespaceName));

                        if (rPr == null)
                            rPr = new Formatting().Xml;

                        /* 
                         * Make sure that every formatting element in f.xml is also in this run,
                         * if this is not true, then their formatting does not match.
                         */
                        if (!ContainsEveryChildOf(matchFormatting.Xml, rPr, fo))
                        {
                            formattingMatch = false;
                            break;
                        }

                        // We have processed some characters, so update the counter.
                        processed += run.Value.Length;

                    } while (processed < m.Length);
                }

                // If the formatting matches, do the replace.
                if (formattingMatch)
                {
                    InsertText(m.Index + oldValue.Length, newValue, trackChanges, newFormatting);
                    RemoveText(m.Index, m.Length, trackChanges);
                }
            }
        }

        internal bool ContainsEveryChildOf(XElement a, XElement b, MatchFormattingOptions fo)
        {
            foreach (XElement e in a.Elements())
            {
                // If a formatting property has the same name and value, its considered to be equivalent.
                if (!b.Elements(e.Name).Where(bElement => bElement.Value == e.Value).Any())
                    return false;
            }

            // If the formatting has to be exact, no additionaly formatting must exist.
            if (fo == MatchFormattingOptions.ExactMatch)
                return a.Elements().Count() == b.Elements().Count();

            return true;
        }

        /// <summary>
        /// Find all instances of a string in this paragraph and return their indexes in a List.
        /// </summary>
        /// <param name="str">The string to find</param>
        /// <returns>A list of indexes.</returns>
        /// <example>
        /// Find all instances of Hello in this document and insert 'don't' in frount of them.
        /// <code>
        /// // Load a document
        /// using (DocX document = DocX.Load(@"Test.docx"))
        /// {
        ///     // Loop through the paragraphs in this document.
        ///     foreach(Paragraph p in document.Paragraphs)
        ///     {
        ///         // Find all instances of 'go' in this paragraph.
        ///         List&lt;int&gt; gos = document.FindAll("go");
        ///
        ///         /* 
        ///          * Insert 'don't' in frount of every instance of 'go' in this document to produce 'don't go'.
        ///          * An important trick here is to do the inserting in reverse document order. If you inserted 
        ///          * in document order, every insert would shift the index of the remaining matches.
        ///          */
        ///         gos.Reverse();
        ///         foreach (int index in gos)
        ///         {
        ///             p.InsertText(index, "don't ", false);
        ///         }
        ///     }
        ///
        ///     // Save all changes made to this document.
        ///     document.Save();
        /// }// Release this document from memory.
        /// </code>
        /// </example>
        public List<int> FindAll(string str)
        {
            return FindAll(str, RegexOptions.None);
        }

        /// <summary>
        /// Find all instances of a string in this paragraph and return their indexes in a List.
        /// </summary>
        /// <param name="str">The string to find</param>
        /// <param name="options">The options to use when finding a string match.</param>
        /// <returns>A list of indexes.</returns>
        /// <example>
        /// Find all instances of Hello in this document and insert 'don't' in frount of them.
        /// <code>
        /// // Load a document
        /// using (DocX document = DocX.Load(@"Test.docx"))
        /// {
        ///     // Loop through the paragraphs in this document.
        ///     foreach(Paragraph p in document.Paragraphs)
        ///     {
        ///         // Find all instances of 'go' in this paragraph (Ignore case).
        ///         List&lt;int&gt; gos = document.FindAll("go", RegexOptions.IgnoreCase);
        ///
        ///         /* 
        ///          * Insert 'don't' in frount of every instance of 'go' in this document to produce 'don't go'.
        ///          * An important trick here is to do the inserting in reverse document order. If you inserted 
        ///          * in document order, every insert would shift the index of the remaining matches.
        ///          */
        ///         gos.Reverse();
        ///         foreach (int index in gos)
        ///         {
        ///             p.InsertText(index, "don't ", false);
        ///         }
        ///     }
        ///
        ///     // Save all changes made to this document.
        ///     document.Save();
        /// }// Release this document from memory.
        /// </code>
        /// </example>
        public List<int> FindAll(string str, RegexOptions options)
        {
            MatchCollection mc = Regex.Matches(this.Text, Regex.Escape(str), options);

            var query =
            (
                from m in mc.Cast<Match>()
                select m.Index
            ).ToList();

            return query;
        }

        /// <summary>
        ///  Find all unique instances of the given Regex Pattern
        /// </summary>
        /// <param name="str"></param>
        /// <param name="options"></param>
        /// <returns></returns>
        public List<string> FindAllByPattern(string str, RegexOptions options)
        {
            MatchCollection mc = Regex.Matches(this.Text, str, options);

            var query =
            (
                from m in mc.Cast<Match>()
                select m.Value
            ).ToList();

            return query;
        }

        /// <summary>
        /// Insert a PageNumber place holder into a Paragraph.
        /// This place holder should only be inserted into a Header or Footer Paragraph.
        /// Word will not automatically update this field if it is inserted into a document level Paragraph.
        /// </summary>
        /// <param name="pnf">The PageNumberFormat can be normal: (1, 2, ...) or Roman: (I, II, ...)</param>
        /// <param name="index">The text index to insert this PageNumber place holder at.</param>
        /// <example>
        /// <code>
        /// // Create a new document.
        /// using (DocX document = DocX.Create(@"Test.docx"))
        /// {
        ///     // Add Headers to the document.
        ///     document.AddHeaders();
        ///
        ///     // Get the default Header.
        ///     Header header = document.Headers.odd;
        ///
        ///     // Insert a Paragraph into the Header.
        ///     Paragraph p0 = header.InsertParagraph("Page ( of )");
        ///
        ///     // Insert place holders for PageNumber and PageCount into the Header.
        ///     // Word will replace these with the correct value for each Page.
        ///     p0.InsertPageNumber(PageNumberFormat.normal, 6);
        ///     p0.InsertPageCount(PageNumberFormat.normal, 11);
        ///
        ///     // Save the document.
        ///     document.Save();
        /// }
        /// </code>
        /// </example>
        /// <seealso cref="AppendPageCount"/>
        /// <seealso cref="AppendPageNumber"/>
        /// <seealso cref="InsertPageCount"/>
        public void InsertPageNumber(PageNumberFormat pnf, int index = 0)
        {
            XElement fldSimple = new XElement(XName.Get("fldSimple", DocX.w.NamespaceName));

            if (pnf == PageNumberFormat.normal)
                fldSimple.Add(new XAttribute(XName.Get("instr", DocX.w.NamespaceName), @" PAGE   \* MERGEFORMAT "));
            else
                fldSimple.Add(new XAttribute(XName.Get("instr", DocX.w.NamespaceName), @" PAGE  \* ROMAN  \* MERGEFORMAT "));

            XElement content = XElement.Parse
            (
             @"<w:r w:rsidR='001D0226' xmlns:w=""http://schemas.openxmlformats.org/wordprocessingml/2006/main"">
                   <w:rPr>
                       <w:noProof /> 
                   </w:rPr>
                   <w:t>1</w:t> 
               </w:r>"
            );

            fldSimple.Add(content);

            if (index == 0)
                Xml.AddFirst(fldSimple);
            else
            {
                Run r = GetFirstRunEffectedByEdit(index, EditType.ins);
                XElement[] splitEdit = SplitEdit(r.Xml, index, EditType.ins);
                r.Xml.ReplaceWith
                (
                    splitEdit[0],
                    fldSimple,
                    splitEdit[1]
                );
            }
        }

        /// <summary>
        /// Append a PageNumber place holder onto the end of a Paragraph.
        /// </summary>
        /// <param name="pnf">The PageNumberFormat can be normal: (1, 2, ...) or Roman: (I, II, ...)</param>
        /// <example>
        /// <code>
        /// // Create a new document.
        /// using (DocX document = DocX.Create(@"Test.docx"))
        /// {
        ///     // Add Headers to the document.
        ///     document.AddHeaders();
        ///
        ///     // Get the default Header.
        ///     Header header = document.Headers.odd;
        ///
        ///     // Insert a Paragraph into the Header.
        ///     Paragraph p0 = header.InsertParagraph();
        ///
        ///     // Appemd place holders for PageNumber and PageCount into the Header.
        ///     // Word will replace these with the correct value for each Page.
        ///     p0.Append("Page (");
        ///     p0.AppendPageNumber(PageNumberFormat.normal);
        ///     p0.Append(" of ");
        ///     p0.AppendPageCount(PageNumberFormat.normal);
        ///     p0.Append(")");
        /// 
        ///     // Save the document.
        ///     document.Save();
        /// }
        /// </code>
        /// </example>
        /// <seealso cref="AppendPageCount"/>
        /// <seealso cref="InsertPageNumber"/>
        /// <seealso cref="InsertPageCount"/>
        public void AppendPageNumber(PageNumberFormat pnf)
        {
            XElement fldSimple = new XElement(XName.Get("fldSimple", DocX.w.NamespaceName));

            if (pnf == PageNumberFormat.normal)
                fldSimple.Add(new XAttribute(XName.Get("instr", DocX.w.NamespaceName), @" PAGE   \* MERGEFORMAT "));
            else
                fldSimple.Add(new XAttribute(XName.Get("instr", DocX.w.NamespaceName), @" PAGE  \* ROMAN  \* MERGEFORMAT "));

            XElement content = XElement.Parse
            (
             @"<w:r w:rsidR='001D0226' xmlns:w=""http://schemas.openxmlformats.org/wordprocessingml/2006/main"">
                   <w:rPr>
                       <w:noProof /> 
                   </w:rPr>
                   <w:t>1</w:t> 
               </w:r>"
            );

            fldSimple.Add(content);
            Xml.Add(fldSimple);
        }

        /// <summary>
        /// Insert a PageCount place holder into a Paragraph.
        /// This place holder should only be inserted into a Header or Footer Paragraph.
        /// Word will not automatically update this field if it is inserted into a document level Paragraph.
        /// </summary>
        /// <param name="pnf">The PageNumberFormat can be normal: (1, 2, ...) or Roman: (I, II, ...)</param>
        /// <param name="index">The text index to insert this PageCount place holder at.</param>
        /// <example>
        /// <code>
        /// // Create a new document.
        /// using (DocX document = DocX.Create(@"Test.docx"))
        /// {
        ///     // Add Headers to the document.
        ///     document.AddHeaders();
        ///
        ///     // Get the default Header.
        ///     Header header = document.Headers.odd;
        ///
        ///     // Insert a Paragraph into the Header.
        ///     Paragraph p0 = header.InsertParagraph("Page ( of )");
        ///
        ///     // Insert place holders for PageNumber and PageCount into the Header.
        ///     // Word will replace these with the correct value for each Page.
        ///     p0.InsertPageNumber(PageNumberFormat.normal, 6);
        ///     p0.InsertPageCount(PageNumberFormat.normal, 11);
        ///
        ///     // Save the document.
        ///     document.Save();
        /// }
        /// </code>
        /// </example>
        /// <seealso cref="AppendPageCount"/>
        /// <seealso cref="AppendPageNumber"/>
        /// <seealso cref="InsertPageNumber"/>
        public void InsertPageCount(PageNumberFormat pnf, int index = 0)
        {
            XElement fldSimple = new XElement(XName.Get("fldSimple", DocX.w.NamespaceName));

            if (pnf == PageNumberFormat.normal)
                fldSimple.Add(new XAttribute(XName.Get("instr", DocX.w.NamespaceName), @" NUMPAGES   \* MERGEFORMAT "));
            else
                fldSimple.Add(new XAttribute(XName.Get("instr", DocX.w.NamespaceName), @" NUMPAGES  \* ROMAN  \* MERGEFORMAT "));

            XElement content = XElement.Parse
            (
             @"<w:r w:rsidR='001D0226' xmlns:w=""http://schemas.openxmlformats.org/wordprocessingml/2006/main"">
                   <w:rPr>
                       <w:noProof /> 
                   </w:rPr>
                   <w:t>1</w:t> 
               </w:r>"
            );

            fldSimple.Add(content);

            if (index == 0)
                Xml.AddFirst(fldSimple);
            else
            {
                Run r = GetFirstRunEffectedByEdit(index, EditType.ins);
                XElement[] splitEdit = SplitEdit(r.Xml, index, EditType.ins);
                r.Xml.ReplaceWith
                (
                    splitEdit[0],
                    fldSimple,
                    splitEdit[1]
                );
            }
        }

        /// <summary>
        /// Append a PageCount place holder onto the end of a Paragraph.
        /// </summary>
        /// <param name="pnf">The PageNumberFormat can be normal: (1, 2, ...) or Roman: (I, II, ...)</param>
        /// <example>
        /// <code>
        /// // Create a new document.
        /// using (DocX document = DocX.Create(@"Test.docx"))
        /// {
        ///     // Add Headers to the document.
        ///     document.AddHeaders();
        ///
        ///     // Get the default Header.
        ///     Header header = document.Headers.odd;
        ///
        ///     // Insert a Paragraph into the Header.
        ///     Paragraph p0 = header.InsertParagraph();
        ///
        ///     // Appemd place holders for PageNumber and PageCount into the Header.
        ///     // Word will replace these with the correct value for each Page.
        ///     p0.Append("Page (");
        ///     p0.AppendPageNumber(PageNumberFormat.normal);
        ///     p0.Append(" of ");
        ///     p0.AppendPageCount(PageNumberFormat.normal);
        ///     p0.Append(")");
        /// 
        ///     // Save the document.
        ///     document.Save();
        /// }
        /// </code>
        /// </example>
        /// <seealso cref="AppendPageNumber"/>
        /// <seealso cref="InsertPageNumber"/>
        /// <seealso cref="InsertPageCount"/>
        public void AppendPageCount(PageNumberFormat pnf)
        {
            XElement fldSimple = new XElement(XName.Get("fldSimple", DocX.w.NamespaceName));

            if (pnf == PageNumberFormat.normal)
                fldSimple.Add(new XAttribute(XName.Get("instr", DocX.w.NamespaceName), @" NUMPAGES   \* MERGEFORMAT "));
            else
                fldSimple.Add(new XAttribute(XName.Get("instr", DocX.w.NamespaceName), @" NUMPAGES  \* ROMAN  \* MERGEFORMAT "));

            XElement content = XElement.Parse
            (
             @"<w:r w:rsidR='001D0226' xmlns:w=""http://schemas.openxmlformats.org/wordprocessingml/2006/main"">
                   <w:rPr>
                       <w:noProof /> 
                   </w:rPr>
                   <w:t>1</w:t> 
               </w:r>"
            );

            fldSimple.Add(content);
            Xml.Add(fldSimple);
        }

        public float LineSpacingBefore
        {
            get
            {
                XElement pPr = GetOrCreate_pPr();
                XElement spacing = pPr.Element(XName.Get("spacing", DocX.w.NamespaceName));

                if (spacing != null)
                {
                    XAttribute line = spacing.Attribute(XName.Get("before", DocX.w.NamespaceName));
                    if (line != null)
                    {
                        float f;

                        if (float.TryParse(line.Value, out f))
                            return f / 20.0f;
                    }
                }

                return 0.0f;
            }

            set
            {
                SpacingBefore(value);
            }
        }

        public float LineSpacingAfter
        {
            get
            {
                XElement pPr = GetOrCreate_pPr();
                XElement spacing = pPr.Element(XName.Get("spacing", DocX.w.NamespaceName));

                if (spacing != null)
                {
                    XAttribute line = spacing.Attribute(XName.Get("after", DocX.w.NamespaceName));
                    if (line != null)
                    {
                        float f;

                        if (float.TryParse(line.Value, out f))
                            return f / 20.0f;
                    }
                }

                return 10.0f;
            }


            set
            {
                SpacingAfter(value);
            }
        }
    }

    public class Run : DocXElement
    {
        // A lookup for the text elements in this paragraph
        Dictionary<int, Text> textLookup = new Dictionary<int, Text>();

        private int startIndex;
        private int endIndex;
        private string text;

        /// <summary>
        /// Gets the start index of this Text (text length before this text)
        /// </summary>
        public int StartIndex { get { return startIndex; } }

        /// <summary>
        /// Gets the end index of this Text (text length before this text + this texts length)
        /// </summary>
        public int EndIndex { get { return endIndex; } }

        /// <summary>
        /// The text value of this text element
        /// </summary>
        internal string Value { set { text = value; } get { return text; } }

        internal Run(DocX document, XElement xml, int startIndex)
            : base(document, xml)
        {
            this.startIndex = startIndex;

            // Get the text elements in this run
            IEnumerable<XElement> texts = xml.Descendants();

            int start = startIndex;

            // Loop through each text in this run
            foreach (XElement te in texts)
            {
                switch (te.Name.LocalName)
                {
                    case "tab":
                        {
                            textLookup.Add(start + 1, new Text(Document, te, start));
                            text += "\t";
                            start++;
                            break;
                        }
                    case "br":
                        {
                            textLookup.Add(start + 1, new Text(Document, te, start));
                            text += "\n";
                            start++;
                            break;
                        }
                    case "t": goto case "delText";
                    case "delText":
                        {
                            // Only add strings which are not empty
                            if (te.Value.Length > 0)
                            {
                                textLookup.Add(start + te.Value.Length, new Text(Document, te, start));
                                text += te.Value;
                                start += te.Value.Length;
                            }
                            break;
                        }
                    default: break;
                }
            }

            endIndex = start;
        }

        static internal XElement[] SplitRun(Run r, int index, EditType type = EditType.ins)
        {
            index = index - r.StartIndex;

            Text t = r.GetFirstTextEffectedByEdit(index, type);
            XElement[] splitText = Text.SplitText(t, index);

            XElement splitLeft = new XElement(r.Xml.Name, r.Xml.Attributes(), r.Xml.Element(XName.Get("rPr", DocX.w.NamespaceName)), t.Xml.ElementsBeforeSelf().Where(n => n.Name.LocalName != "rPr"), splitText[0]);
            if (Paragraph.GetElementTextLength(splitLeft) == 0)
                splitLeft = null;

            XElement splitRight = new XElement(r.Xml.Name, r.Xml.Attributes(), r.Xml.Element(XName.Get("rPr", DocX.w.NamespaceName)), splitText[1], t.Xml.ElementsAfterSelf().Where(n => n.Name.LocalName != "rPr"));
            if (Paragraph.GetElementTextLength(splitRight) == 0)
                splitRight = null;

            return
            (
                new XElement[]
                {
                    splitLeft,
                    splitRight
                }
            );
        }

        internal Text GetFirstTextEffectedByEdit(int index, EditType type = EditType.ins)
        {
            // Make sure we are looking within an acceptable index range.
            if (index < 0 || index > HelperFunctions.GetText(Xml).Length)
                throw new ArgumentOutOfRangeException();

            // Need some memory that can be updated by the recursive search for the XElement to Split.
            int count = 0;
            Text theOne = null;

            GetFirstTextEffectedByEditRecursive(Xml, index, ref count, ref theOne, type);

            return theOne;
        }

        internal void GetFirstTextEffectedByEditRecursive(XElement Xml, int index, ref int count, ref Text theOne, EditType type = EditType.ins)
        {
            count += HelperFunctions.GetSize(Xml);
            if (count > 0 && ((type == EditType.del && count > index) || (type == EditType.ins && count >= index)))
            {
                theOne = new Text(Document, Xml, count - HelperFunctions.GetSize(Xml));
                return;
            }

            if (Xml.HasElements)
                foreach (XElement e in Xml.Elements())
                    if (theOne == null)
                        GetFirstTextEffectedByEditRecursive(e, index, ref count, ref theOne);
        }
    }

    internal class Text : DocXElement
    {
        private int startIndex;
        private int endIndex;
        private string text;

        /// <summary>
        /// Gets the start index of this Text (text length before this text)
        /// </summary>
        public int StartIndex { get { return startIndex; } }

        /// <summary>
        /// Gets the end index of this Text (text length before this text + this texts length)
        /// </summary>
        public int EndIndex { get { return endIndex; } }

        /// <summary>
        /// The text value of this text element
        /// </summary>
        public string Value { get { return text; } }

        internal Text(DocX document, XElement xml, int startIndex)
            : base(document, xml)
        {
            this.startIndex = startIndex;

            switch (Xml.Name.LocalName)
            {
                case "t":
                    {
                        goto case "delText";
                    }

                case "delText":
                    {
                        endIndex = startIndex + xml.Value.Length;
                        text = xml.Value;
                        break;
                    }

                case "br":
                    {
                        text = "\n";
                        endIndex = startIndex + 1;
                        break;
                    }

                case "tab":
                    {
                        text = "\t";
                        endIndex = startIndex + 1;
                        break;
                    }
                default:
                    {
                        break;
                    }
            }
        }

        internal static XElement[] SplitText(Text t, int index)
        {
            if (index < t.startIndex || index > t.EndIndex)
                throw new ArgumentOutOfRangeException("index");

            XElement splitLeft = null, splitRight = null;
            if (t.Xml.Name.LocalName == "t" || t.Xml.Name.LocalName == "delText")
            {
                // The origional text element, now containing only the text before the index point.
                splitLeft = new XElement(t.Xml.Name, t.Xml.Attributes(), t.Xml.Value.Substring(0, index - t.startIndex));
                if (splitLeft.Value.Length == 0)
                    splitLeft = null;
                else
                    PreserveSpace(splitLeft);

                // The origional text element, now containing only the text after the index point.
                splitRight = new XElement(t.Xml.Name, t.Xml.Attributes(), t.Xml.Value.Substring(index - t.startIndex, t.Xml.Value.Length - (index - t.startIndex)));
                if (splitRight.Value.Length == 0)
                    splitRight = null;
                else
                    PreserveSpace(splitRight);
            }

            else
            {
                if (index == t.EndIndex)
                    splitLeft = t.Xml;

                else
                    splitRight = t.Xml;
            }

            return
            (
                new XElement[]
                {
                    splitLeft,
                    splitRight
                }
            );
        }

        /// <summary>
        /// If a text element or delText element, starts or ends with a space,
        /// it must have the attribute space, otherwise it must not have it.
        /// </summary>
        /// <param name="e">The (t or delText) element check</param>
        public static void PreserveSpace(XElement e)
        {
            // PreserveSpace should only be used on (t or delText) elements
            if (!e.Name.Equals(DocX.w + "t") && !e.Name.Equals(DocX.w + "delText"))
                throw new ArgumentException("SplitText can only split elements of type t or delText", "e");

            // Check if this w:t contains a space atribute
            XAttribute space = e.Attributes().Where(a => a.Name.Equals(XNamespace.Xml + "space")).SingleOrDefault();

            // This w:t's text begins or ends with whitespace
            if (e.Value.StartsWith(" ") || e.Value.EndsWith(" "))
            {
                // If this w:t contains no space attribute, add one.
                if (space == null)
                    e.Add(new XAttribute(XNamespace.Xml + "space", "preserve"));
            }

            // This w:t's text does not begin or end with a space
            else
            {
                // If this w:r contains a space attribute, remove it.
                if (space != null)
                    space.Remove();
            }
        }
    }
}
