#region MigraDoc - Creating Documents on the Fly
//
// Authors:
//   Klaus Potzesny (mailto:Klaus.Potzesny@pdfsharp.com)
//
// Copyright (c) 2001-2008 empira Software GmbH, Cologne (Germany)
//
// http://www.pdfsharp.com
// http://www.migradoc.com
// http://sourceforge.net/projects/pdfsharp
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
// DEALINGS IN THE SOFTWARE.
#endregion

using System;
using System.IO;
using System.Text;

namespace MigraDoc.RtfRendering
{
  /// <summary>
  /// Class to write RTF output.
  /// </summary>
  internal class RtfWriter
  {
    /// <summary>
    /// Initializes a new instance of the RtfWriter class.
    /// </summary>
    public RtfWriter(TextWriter textWriter)
    {
      this.textWriter = textWriter;
    }

    /// <summary>
    /// Writes a left brace.
    /// </summary>
    public void StartContent()
    {
      this.textWriter.Write("{");
      this.lastWasControl = false;
    }

    /// <summary>
    /// Writes a right brace.
    /// </summary>
    public void EndContent()
    {
      this.textWriter.Write("}");
      this.lastWasControl = false;
    }

    /// <summary>
    /// Writes the given text, handling special characters before.
    /// </summary>
    public void WriteText(string text)
    {
      StringBuilder strBuilder = new StringBuilder(text.Length);
      if (this.lastWasControl)
        strBuilder.Append(" ");

      int lengh = text.Length;
      for (int idx = 0; idx < lengh; idx++)
      {
        char ch = text[idx];
        switch (ch)
        {
          case '\\':
            strBuilder.Append(@"\\");
            break;

          case '{':
            strBuilder.Append(@"\{");
            break;

          case '}':
            strBuilder.Append(@"\}");
            break;

          case '­': //character 173, softhyphen
            strBuilder.Append(@"\-");
            break;

          default:
            if (IsCp1252Char(ch))
              strBuilder.Append(ch);
            else
            {
              strBuilder.Append(@"\u");
              strBuilder.Append(((int)ch).ToString());
              strBuilder.Append('?');
            }
            break;
        }
      }
      this.textWriter.Write(strBuilder.ToString());
      lastWasControl = false;
    }

    /// <summary>
    /// Indicates whether the specified Unicode character is available in the Ansi code page 1252.
    /// </summary>
    static bool IsCp1252Char(char ch)
    {
      if (ch < '\u00FF')
        return true;
      switch (ch)
      {
        case '\u20AC':
        case '\u0081':
        case '\u201A':
        case '\u0192':
        case '\u201E':
        case '\u2026':
        case '\u2020':
        case '\u2021':
        case '\u02C6':
        case '\u2030':
        case '\u0160':
        case '\u2039':
        case '\u0152':
        case '\u008D':
        case '\u017D':
        case '\u008F':
        case '\u0090':
        case '\u2018':
        case '\u2019':
        case '\u201C':
        case '\u201D':
        case '\u2022':
        case '\u2013':
        case '\u2014':
        case '\u02DC':
        case '\u2122':
        case '\u0161':
        case '\u203A':
        case '\u0153':
        case '\u009D':
        case '\u017E':
        case '\u0178':
          return true;
      }
      return false;
    }

    /// <summary>
    /// Writes the number as hex value. Only numbers &lt;= 255 are allowed.
    /// </summary>
    public void WriteHex(uint hex)
    {
      if (hex > 0xFF)
        //TODO: Fehlermeldung
        return;

      this.textWriter.Write(@"\'" + hex.ToString("x"));
      lastWasControl = false;
      //Dahinter darf kein zusätzliches Blank stehen.
    }

    /// <summary>
    /// Writes a blank in paragraph text.
    /// </summary>
    public void WriteBlank()
    {
      this.textWriter.Write(" ");
    }

    /// <summary>
    /// Writes a semicolon as separator e.g. in in font tables.
    /// </summary>
    public void WriteSeparator()
    {
      this.textWriter.Write(";");
      lastWasControl = false;
    }

    /// <summary>
    /// Writes the given string as control word optionally with a star.
    /// </summary>
    public void WriteControl(string ctrl, bool withStar)
    {
      if (!withStar)
        WriteControl(ctrl);
      else
        WriteControlWithStar(ctrl);
    }

    /// <summary>
    /// Writes the given string as control word with a star followed by a space.
    /// </summary>
    public void WriteControl(string ctrl, string value, bool withStar)
    {
      if (withStar)
        WriteControlWithStar(ctrl, value);
      else
        WriteControl(ctrl, value);
    }

    /// <summary>
    /// Writes the given string as control word with a star followed by a space.
    /// </summary>
    public void WriteControl(string ctrl, int value, bool withStar)
    {
      WriteControl(ctrl, value.ToString(), withStar);
    }

    /// <summary>
    /// Writes the given string as control word.
    /// </summary>
    public void WriteControl(string ctrl)
    {
      WriteControl(ctrl, "");
    }

    /// <summary>
    /// Writes the given string and integer as control word / value pair followed by a space.
    /// </summary>
    public void WriteControl(string ctrl, int value)
    {
      WriteControl(ctrl, value.ToString());
    }

    /// <summary>
    /// Writes the given strings as control word / value pair.
    /// </summary>
    public void WriteControl(string ctrl, string value)
    {
      this.textWriter.Write("\\" + ctrl + value);
      lastWasControl = true;
    }

    /// <summary>
    /// Writes the given string and integer as control word / value pair
    /// with a star.
    /// </summary>
    public void WriteControlWithStar(string ctrl)
    {
      WriteControlWithStar(ctrl, "");
    }

    /// <summary>
    /// Writes the given string and integer as control word / value pair followed by a space.
    /// </summary>
    public void WriteControlWithStar(string ctrl, int value)
    {
      WriteControlWithStar(ctrl, value.ToString());
    }

    /// <summary>
    /// Writes the given string and integer as control word / value pair
    /// with a star.
    /// </summary>
    public void WriteControlWithStar(string ctrl, string value)
    {
      this.textWriter.Write("\\*\\" + ctrl + value);
      lastWasControl = true;
    }

    private bool lastWasControl = false;
    private TextWriter textWriter;
  }
}
