#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

#define CACHE_FONTS_

using System;
using System.Collections;
using System.Text;
using PdfSharp.Pdf;
using PdfSharp.Drawing;
using MigraDoc.DocumentObjectModel;

namespace MigraDoc.Rendering
{
  /// <summary>
  /// Helps measuring and handling fonts.
  /// </summary>
  internal class FontHandler
  {
#if DEBUG
    internal static int CreateFontCounter;
#endif

    /// <summary>
    /// Converts an DOM Font to an XFont.
    /// </summary>
    internal static XFont FontToXFont(Font font, XPrivateFontCollection pfc, 
      PdfFontEncoding encoding, PdfFontEmbedding fontEmbedding)
    {
      XFont xFont = null;
#if GDI
#if CACHE_FONTS
      string signature = BuildSignature(font, unicode, fontEmbedding);
      xFont = fontCache[signature] as XFont;
      if (xFont == null)
      {
        XPdfFontOptions options = null;
        options = new XPdfFontOptions(fontEmbedding, unicode);
        XFontStyle style = GetXStyle(font);
        xFont = new XFont(font.Name, font.Size, style, options);
        fontCache[signature] = xFont;
      }
#else
      XPdfFontOptions options = null;
      options = new XPdfFontOptions(encoding, fontEmbedding);
      XFontStyle style = GetXStyle(font);
      if (pfc != null &&
        pfc.PrivateFontCollection != null)
      {
        // Is it a private font?
        try
        {
          foreach (System.Drawing.FontFamily ff in pfc.PrivateFontCollection.Families)
          {
            if (String.Compare(ff.Name, font.Name, true) == 0)
            {
              xFont = new XFont(ff, font.Size, style, options, pfc);
              break;
            }
          }
        }
        catch
        {
#if DEBUG
          pfc.GetType();
#endif
        }
      }
#endif
#endif

#if WPF
      XPdfFontOptions options = null;
      options = new XPdfFontOptions(encoding, fontEmbedding);
      XFontStyle style = GetXStyle(font);
      //if (pfc != null &&
      //  pfc.PrivateFontCollection != null)
      //{
      //  // Is it a private font?
      //  try
      //  {
      //    foreach (System.Drawing.FontFamily ff in pfc.PrivateFontCollection.Families)
      //    {
      //      if (String.Compare(ff.Name, font.Name, true) == 0)
      //      {
      //        xFont = new XFont(ff, font.Size, style, options, pfc);
      //        break;
      //      }
      //    }
      //  }
      //  catch
      //  {
      //  }
      //}
#endif

      if (xFont == null)
        xFont = new XFont(font.Name, font.Size, style, options);
#if DEBUG
      CreateFontCounter++;
#endif
      return xFont;
    }

    internal static XFontStyle GetXStyle(Font font)
    {
      XFontStyle style = XFontStyle.Regular;
      if (font.Bold)
      {
        if (font.Italic)
          style = XFontStyle.BoldItalic;
        else
          style = XFontStyle.Bold;
      }
      else if (font.Italic)
        style = XFontStyle.Italic;

      return style;
    }

    internal static XUnit GetDescent(XFont font)
    {
      XUnit descent = -font.Metrics.Descent;
      descent *= font.Size;
      descent /= font.FontFamily.GetEmHeight(font.Style);
      return descent;
    }

    internal static XUnit GetAscent(XFont font)
    {
      XUnit ascent = font.Metrics.Ascent;
      ascent *= font.Size;
      ascent /= font.FontFamily.GetEmHeight(font.Style);
      return ascent;
    }

    internal static double GetSubSuperScaling(XFont font)
    {
      return 0.8 * GetAscent(font) / font.GetHeight();
    }

    internal static XFont ToSubSuperFont(XFont font)
    {
      double size = font.Size * GetSubSuperScaling(font);
      return new XFont(font.Name, size, font.Style, font.PdfOptions);
    }

    internal static XBrush FontColorToXBrush(Font font)
    {
#if noCMYK
      return new XSolidBrush(XColor.FromArgb((int)font.Color.A, (int)font.Color.R, (int)font.Color.G, (int)font.Color.B));
#else
      return new XSolidBrush(ColorHelper.ToXColor(font.Color, font.Document.UseCmykColor));
#endif
    }

#if CACHE_FONTS
    static XFont XFontFromCache(Font font, bool unicode, PdfFontEmbedding fontEmbedding)
    {
      XFont xFont = null;

      XPdfFontOptions options = null;
      options = new XPdfFontOptions(fontEmbedding, unicode);
      XFontStyle style = GetXStyle(font);
      xFont = new XFont(font.Name, font.Size, style, options);

      return xFont;
    }

    static string BuildSignature(Font font, bool unicode, PdfFontEmbedding fontEmbedding)
    {
      StringBuilder signature = new StringBuilder(128);
      signature.Append(font.Name.ToLower());
      signature.Append(font.Size.Point.ToString("##0.0"));
      return signature.ToString();
    }

    static Hashtable fontCache = new Hashtable();
#endif
  }
}
