/*************************************************************************************

   DocX – DocX is the community edition of Xceed Words for .NET

   Copyright (C) 2009-2016 Xceed Software Inc.

   This program is provided to you under the terms of the Microsoft Public
   License (Ms-PL) as published at http://wpftoolkit.codeplex.com/license 

   For more features and fast professional support,
   pick up Xceed Words for .NET at https://xceed.com/xceed-words-for-net/

  ***********************************************************************************/

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml.Linq;
using System.IO.Packaging;

namespace Xceed.Words.NET
{
  /// <summary>
  /// Represents a Hyperlink in a document.
  /// </summary>
  public class Hyperlink : DocXElement
  {
    #region Internal Members

    internal Uri uri;
    internal String text;

    internal Dictionary<PackagePart, PackageRelationship> hyperlink_rels;    
    internal int type;
    internal String id;
    internal XElement instrText;
    internal List<XElement> runs;

    #endregion

    #region Public Properties

    /// <summary>
    /// Change the Text of a Hyperlink.
    /// </summary>
    /// <example>
    /// Change the Text of a Hyperlink.
    /// <code>
    /// // Create a document.
    /// using (DocX document = DocX.Load(@"Test.docx"))
    /// {
    ///    // Get all of the hyperlinks in this document
    ///    List&lt;Hyperlink&gt; hyperlinks = document.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 string Text
    {
      get
      {
        return this.text;
      }

      set
      {
        XElement rPr =
            new XElement
            (
                DocX.w + "rPr",
                new XElement
                (
                    DocX.w + "rStyle",
                    new XAttribute( DocX.w + "val", "Hyperlink" )
                )
            );

        // Format and add the new text.
        List<XElement> newRuns = HelperFunctions.FormatInput( value, rPr );

        if( type == 0 )
        {
          // Get all the runs in this Text.
          var runs = from r in Xml.Elements()
                     where r.Name.LocalName == "r"
                     select r;

          // Remove each run.
          for( int i = 0; i < runs.Count(); i++ )
            runs.Remove();

          Xml.Add( newRuns );
        }

        else
        {
          XElement separate = XElement.Parse( @"
                    <w:r xmlns:w='http://schemas.openxmlformats.org/wordprocessingml/2006/main'>
                        <w:fldChar w:fldCharType='separate'/> 
                    </w:r>" );

          XElement end = XElement.Parse( @"
                    <w:r xmlns:w='http://schemas.openxmlformats.org/wordprocessingml/2006/main'>
                        <w:fldChar w:fldCharType='end' /> 
                    </w:r>" );

          runs.Last().AddAfterSelf( separate, newRuns, end );
          runs.ForEach( r => r.Remove() );
        }

        this.text = value;
      }
    }

    /// <summary>
    /// Change the Uri of a Hyperlink.
    /// </summary>
    /// <example>
    /// Change the Uri of a Hyperlink.
    /// <code>
    /// <![CDATA[
    /// // Create a document.
    /// using (DocX document = DocX.Load(@"Test.docx"))
    /// {
    ///    // Get all of the hyperlinks in this document
    ///    List<Hyperlink> hyperlinks = document.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 Uri Uri
    {
      get
      {
        if( (type == 0) && !String.IsNullOrEmpty(id) )
        {
          var r = this.PackagePart.GetRelationship( id );
          return r.TargetUri;
        }

        return this.uri;
      }

      set
      {
        if( type == 0 )
        {
          var r = this.PackagePart.GetRelationship( id );

          // Get all of the information about this relationship.
          var r_tm = r.TargetMode;
          var r_rt = r.RelationshipType;
          var r_id = r.Id;

          // Delete the relationship
          this.PackagePart.DeleteRelationship( r_id );
          this.PackagePart.CreateRelationship( value, r_tm, r_rt, r_id );
        }

        else
        {
          instrText.Value = "HYPERLINK " + "\"" + value + "\"";
        }

        this.uri = value;
      }
    }

    #endregion

    #region Constructors

    internal Hyperlink( DocX document, PackagePart mainPart, XElement i ) : base( document, i )
    {
      this.type = 0;
      var idAttribute = i.Attribute( XName.Get( "id", DocX.r.NamespaceName ) );
      if( idAttribute != null )
      {
        this.id = idAttribute.Value;
      }

      StringBuilder sb = new StringBuilder();
      HelperFunctions.GetTextRecursive( i, ref sb );
      this.text = sb.ToString();
    }

    internal Hyperlink( DocX document, XElement instrText, List<XElement> runs ) : base( document, null )
    {
      this.type = 1;
      this.instrText = instrText;
      this.runs = runs;

      try
      {
        int start = instrText.Value.IndexOf( "HYPERLINK \"" );
        if( start != -1 )
          start += "HYPERLINK \"".Length;
        int end = instrText.Value.IndexOf( "\"", Math.Max( 0, start ));
        if( start != -1 && end != -1 )
        {
          this.uri = new Uri( instrText.Value.Substring( start, end - start ), UriKind.Absolute );

          StringBuilder sb = new StringBuilder();
          HelperFunctions.GetTextRecursive( new XElement( XName.Get( "temp", DocX.w.NamespaceName ), runs ), ref sb );
          this.text = sb.ToString();
        }
      }

      catch( Exception e ) { throw e; }
    }

    #endregion

    #region Public Methods

    /// <summary>
    /// Remove a Hyperlink from this Paragraph only.
    /// </summary>
    /// <example>
    /// <code>
    /// // Create a document.
    /// using (DocX document = DocX.Create(@"Test.docx"))
    /// {
    ///    // Add a hyperlink to this document.
    ///    Hyperlink h = document.AddHyperlink("link", new Uri("http://www.google.com"));
    ///
    ///    // Add a Paragraph to this document and insert the hyperlink
    ///    Paragraph p1 = document.InsertParagraph();
    ///    p1.Append("This is a cool ").AppendHyperlink(h).Append(" .");
    ///
    ///    /* 
    ///     * Remove the hyperlink from this Paragraph only. 
    ///     * Note a reference to the hyperlink will still exist in the document and it can thus be reused.
    ///     */
    ///    p1.Hyperlinks[0].Remove();
    ///
    ///    // Add a new Paragraph to this document and reuse the hyperlink h.
    ///    Paragraph p2 = document.InsertParagraph();
    ///    p2.Append("This is the same cool ").AppendHyperlink(h).Append(" .");
    ///
    ///    document.Save();
    /// }// Release this document from memory.
    /// </code>
    /// </example>
    public void Remove()
    {
      Xml.Remove();
    }

    #endregion
  }
}