#region PDFsharp - A .NET library for processing PDF
//
// Authors:
//   Stefan Lange (mailto:Stefan.Lange@pdfsharp.com)
//
// Copyright (c) 2005-2007 empira Software GmbH, Cologne (Germany)
//
// http://www.pdfsharp.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.Collections;
using System.Globalization;
using System.Text;
using System.IO;
using PdfSharp.Internal;
using PdfSharp.Fonts.TrueType;

namespace PdfSharp.Pdf.Advanced
{
  /// <summary>
  /// The PDF font descriptor flags.
  /// </summary>
  [Flags]
  enum PdfFontDescriptorFlags
  {
    /// <summary>
    /// All glyphs have the same width (as opposed to proportional or variable-pitch
    /// fonts, which have different widths).
    /// </summary>
    FixedPitch = 1 << 0,

    /// <summary>
    /// Glyphs have serifs, which are short strokes drawn at an angle on the top and
    /// bottom of glyph stems. (Sans serif fonts do not have serifs.)
    /// </summary>
    Serif = 1 << 1,

    /// <summary>
    /// Font contains glyphs outside the Adobe standard Latin character set. This
    /// flag and the Nonsymbolic flag cannot both be set or both be clear.
    /// </summary>
    Symbolic = 1 << 2,

    /// <summary>
    /// Glyphs resemble cursive handwriting.
    /// </summary>
    Script = 1 << 3,

    /// <summary>
    /// Font uses the Adobe standard Latin character set or a subset of it.
    /// </summary>
    Nonsymbolic = 1 << 5,

    /// <summary>
    /// Glyphs have dominant vertical strokes that are slanted.
    /// </summary>
    Italic = 1 << 6,

    /// <summary>
    /// Font contains no lowercase letters; typically used for display purposes,
    /// such as for titles or headlines.
    /// </summary>
    AllCap = 1 << 16,

    /// <summary>
    /// Font contains both uppercase and lowercase letters. The uppercase letters are
    /// similar to those in the regular version of the same typeface family. The glyphs
    /// for the lowercase letters have the same shapes as the corresponding uppercase
    /// letters, but they are sized and their proportions adjusted so that they have the
    /// same size and stroke weight as lowercase glyphs in the same typeface family.
    /// </summary>
    SmallCap = 1 << 17,

    /// <summary>
    /// Determines whether bold glyphs are painted with extra pixels even at very small
    /// text sizes.
    /// </summary>
    ForceBold = 1 << 18,
  }

  /// <summary>
  /// A PDF font descriptor specifies metrics and other attributes of a simple font, 
  /// as distinct from the metrics of individual glyphs.
  /// </summary>
  internal sealed class PdfFontDescriptor : PdfDictionary
  {
    public PdfFontDescriptor(PdfDocument document, TrueTypeDescriptor descriptor)
      : base(document)
    {
      this.descriptor = descriptor;
      Elements.SetName(Keys.Type, "/FontDescriptor");

      Elements.SetInteger(Keys.Ascent, this.descriptor.DesignUnitsToPdf(this.descriptor.Ascender));
      Elements.SetInteger(Keys.CapHeight, this.descriptor.DesignUnitsToPdf(this.descriptor.CapHeight));
      Elements.SetInteger(Keys.Descent, this.descriptor.DesignUnitsToPdf(this.descriptor.Descender));
      Elements.SetInteger(Keys.Flags, (int)FlagsFromDescriptor(this.descriptor));
      Elements.SetRectangle(Keys.FontBBox, new PdfRectangle(
        this.descriptor.DesignUnitsToPdf(this.descriptor.XMin),
        this.descriptor.DesignUnitsToPdf(this.descriptor.YMin),
        this.descriptor.DesignUnitsToPdf(this.descriptor.XMax),
        this.descriptor.DesignUnitsToPdf(this.descriptor.YMax)));
      // not here, done in PdfFont later... 
      //Elements.SetName(Keys.FontName, "abc"); //this.descriptor.FontName);
      Elements.SetReal(Keys.ItalicAngle, this.descriptor.ItalicAngle);
      Elements.SetInteger(Keys.StemV, this.descriptor.StemV);
      Elements.SetInteger(Keys.XHeight, this.descriptor.DesignUnitsToPdf(this.descriptor.XHeight));
    }

    //HACK
    public TrueTypeDescriptor descriptor;

    //    public string DefaultName
    //    {
    //      get {return this.defaultName;}
    //      set {this.defaultName = value;}
    //    }
    //    string defaultName;

    public string FontName
    {
      get { return Elements.GetName(Keys.FontName); }
      set { Elements.SetName(Keys.FontName, value); }
    }
    //string fontName;

    public bool IsSymbolFont
    {
      get { return this.isSymbolFont; }
    }
    bool isSymbolFont;

    //    bool SetFontFlags()
    //    {
    //      //if (font->type != pdc_Type3)
    //      //{
    //      //  if (font->isFixedPitch)
    //      //    font->flags |= FIXEDWIDTH;
    //      //
    //      //  if (font->isstdlatin == pdc_true ||
    //      //    font->encoding == pdc_winansi ||
    //      //    font->encoding == pdc_macroman ||
    //      //    font->encoding == pdc_ebcdic ||
    //      //    font->encoding == pdc_ebcdic_37)
    //      //    font->flags |= ADOBESTANDARD;
    //      //  else
    //      //    font->flags |= SYMBOL;
    //      //
    //      //  if (font->italicAngle < 0 ||
    //      //    font->style == pdc_Italic || font->style == pdc_BoldItalic)
    //      //    font->flags |= ITALIC;
    //      //  if (font->italicAngle == 0 && font->flags & ITALIC)
    //      //    font->italicAngle = PDC_DEF_ITALICANGLE;
    //      //
    //      //  /* heuristic to identify (small) caps fonts */
    //      //  if (font->name &&
    //      //    (strstr(font->name, "Caps") ||
    //      //    !strcmp(font->name + strlen(font->name) - 2, "SC")))
    //      //    font->flags |= SMALLCAPS;
    //      //
    //      //  if (font->style == pdc_Bold || font->style == pdc_BoldItalic)
    //      //    font->StdVW = PDF_STEMV_BOLD;
    //      //
    //      //  if (strstr(font->name, "Bold") || font->StdVW > PDF_STEMV_SEMIBOLD)
    //      //    font->flags |= FORCEBOLD;
    //      //}
    //      //
    //      //if (font->style != pdc_Normal &&
    //      //  (font->embedding || font->type == pdc_Type1 ||
    //      //  font->type == pdc_MMType1 || font->type == pdc_Type3))
    //      //{
    //      //  pdc_set_errmsg(p->pdc, PDF_E_FONT_EMBEDSTYLE, 0, 0, 0, 0);
    //      //  if (font->verbose == pdc_true)
    //      //  {
    //      //    pdf_cleanup_font(p, font);
    //      //    pdc_error(p->pdc, -1, 0, 0, 0, 0);
    //      //  }
    //      //  return pdc_false;
    //      //}
    //      return true;
    //    }

    // HACK
    PdfFontDescriptorFlags FlagsFromDescriptor(TrueTypeDescriptor descriptor)
    {
      PdfFontDescriptorFlags flags = 0;
      this.isSymbolFont = descriptor.image.cmap.symbol;
      flags |= descriptor.image.cmap.symbol ? PdfFontDescriptorFlags.Symbolic : PdfFontDescriptorFlags.Nonsymbolic;
      return flags;
    }

    /// <summary>
    /// Predefined keys of this dictionary.
    /// </summary>
    internal sealed class Keys : KeysBase
    {
      /// <summary>
      /// (Required) The type of PDF object that this dictionary describes; must be
      /// FontDescriptor for a font descriptor.
      /// </summary>
      [KeyInfo(KeyType.Name | KeyType.Required, FixedValue = "FontDescriptor")]
      public const string Type = "/Type";

      /// <summary>
      /// (Required) The PostScript name of the font. This name should be the same as the 
      /// value of BaseFont in the font or CIDFont dictionary that refers to this font descriptor.
      /// </summary>
      [KeyInfo(KeyType.Name | KeyType.Required)]
      public const string FontName = "/FontName";

      /// <summary>
      /// (Optional; PDF 1.5; strongly recommended for Type 3 fonts in Tagged PDF documents)
      /// A string specifying the preferred font family name. For example, for the font 
      /// Times Bold Italic, the FontFamily is Times.
      /// </summary>
      [KeyInfo(KeyType.String | KeyType.Optional)]
      public const string FontFamily = "/FontFamily";

      /// <summary>
      /// (Optional; PDF 1.5; strongly recommended for Type 3 fonts in Tagged PDF documents)
      /// The font stretch value. It must be one of the following names (ordered from 
      /// narrowest to widest): UltraCondensed, ExtraCondensed, Condensed, SemiCondensed, 
      /// Normal, SemiExpanded, Expanded, ExtraExpanded or UltraExpanded.
      /// Note: The specific interpretation of these values varies from font to font. 
      /// For example, Condensed in one font may appear most similar to Normal in another.
      /// </summary>
      [KeyInfo(KeyType.Name | KeyType.Optional)]
      public const string FontStretch = "/FontStretch";

      /// <summary>
      /// (Optional; PDF 1.5; strongly recommended for Type 3 fonts in Tagged PDF documents)
      /// The weight (thickness) component of the fully-qualified font name or font specifier.
      /// The possible values are 100, 200, 300, 400, 500, 600, 700, 800, or 900, where each
      /// number indicates a weight that is at least as dark as its predecessor. A value of 
      /// 400 indicates a normal weight; 700 indicates bold.
      /// Note: The specific interpretation of these values varies from font to font. 
      /// For example, 300 in one font may appear most similar to 500 in another.
      /// </summary>
      [KeyInfo(KeyType.Real | KeyType.Optional)]
      public const string FontWeight = "/FontWeight";

      /// <summary>
      /// (Required) A collection of flags defining various characteristics of the font.
      /// </summary>
      [KeyInfo(KeyType.Integer | KeyType.Required)]
      public const string Flags = "/Flags";

      /// <summary>
      /// (Required, except for Type 3 fonts) A rectangle (see Section 3.8.4, “Rectangles”),
      /// expressed in the glyph coordinate system, specifying the font bounding box. This 
      /// is the smallest rectangle enclosing the shape that would result if all of the 
      /// glyphs of the font were placed with their origins coincident and then filled.
      /// </summary>
      [KeyInfo(KeyType.Rectangle | KeyType.Required)]
      public const string FontBBox = "/FontBBox";

      /// <summary>
      /// (Required) The angle, expressed in degrees counterclockwise from the vertical, of
      /// the dominant vertical strokes of the font. (For example, the 9-o’clock position is 90 
      /// degrees, and the 3-o’clock position is –90 degrees.) The value is negative for fonts 
      /// that slope to the right, as almost all italic fonts do.
      /// </summary>
      [KeyInfo(KeyType.Real | KeyType.Required)]
      public const string ItalicAngle = "/ItalicAngle";

      /// <summary>
      /// (Required, except for Type 3 fonts) The maximum height above the baseline reached 
      /// by glyphs in this font, excluding the height of glyphs for accented characters.
      /// </summary>
      [KeyInfo(KeyType.Real | KeyType.Required)]
      public const string Ascent = "/Ascent";

      /// <summary>
      /// (Required, except for Type 3 fonts) The maximum depth below the baseline reached 
      /// by glyphs in this font. The value is a negative number.
      /// </summary>
      [KeyInfo(KeyType.Real | KeyType.Required)]
      public const string Descent = "/Descent";

      /// <summary>
      /// (Optional) The spacing between baselines of consecutive lines of text.
      /// Default value: 0.
      /// </summary>
      [KeyInfo(KeyType.Real | KeyType.Optional)]
      public const string Leading = "/Leading";

      /// <summary>
      /// (Required for fonts that have Latin characters, except for Type 3 fonts) The vertical
      /// coordinate of the top of flat capital letters, measured from the baseline.
      /// </summary>
      [KeyInfo(KeyType.Real | KeyType.Required)]
      public const string CapHeight = "/CapHeight";

      /// <summary>
      /// (Optional) The font’s x height: the vertical coordinate of the top of flat nonascending
      /// lowercase letters (like the letter x), measured from the baseline, in fonts that have 
      /// Latin characters. Default value: 0.
      /// </summary>
      [KeyInfo(KeyType.Real | KeyType.Optional)]
      public const string XHeight = "/XHeight";

      /// <summary>
      /// (Required, except for Type 3 fonts) The thickness, measured horizontally, of the dominant 
      /// vertical stems of glyphs in the font.
      /// </summary>
      [KeyInfo(KeyType.Real | KeyType.Required)]
      public const string StemV = "/StemV";

      /// <summary>
      /// (Optional) The thickness, measured vertically, of the dominant horizontal stems 
      /// of glyphs in the font. Default value: 0.
      /// </summary>
      [KeyInfo(KeyType.Real | KeyType.Optional)]
      public const string StemH = "/StemH";

      /// <summary>
      /// (Optional) The average width of glyphs in the font. Default value: 0.
      /// </summary>
      [KeyInfo(KeyType.Real | KeyType.Optional)]
      public const string AvgWidth = "/AvgWidth";

      /// <summary>
      /// (Optional) The maximum width of glyphs in the font. Default value: 0.
      /// </summary>
      [KeyInfo(KeyType.Real | KeyType.Optional)]
      public const string MaxWidth = "/MaxWidth";

      /// <summary>
      /// (Optional) The width to use for character codes whose widths are not specified in a 
      /// font dictionary’s Widths array. This has a predictable effect only if all such codes 
      /// map to glyphs whose actual widths are the same as the value of the MissingWidth entry.
      /// Default value: 0.
      /// </summary>
      [KeyInfo(KeyType.Real | KeyType.Optional)]
      public const string MissingWidth = "/MissingWidth";

      /// <summary>
      /// (Optional) A stream containing a Type 1 font program.
      /// </summary>
      [KeyInfo(KeyType.Stream | KeyType.Optional)]
      public const string FontFile = "/FontFile";

      /// <summary>
      /// (Optional; PDF 1.1) A stream containing a TrueType font program.
      /// </summary>
      [KeyInfo(KeyType.Stream | KeyType.Optional)]
      public const string FontFile2 = "/FontFile2";

      /// <summary>
      /// (Optional; PDF 1.2) A stream containing a font program whose format is specified 
      /// by the Subtype entry in the stream dictionary.
      /// </summary>
      [KeyInfo(KeyType.Stream | KeyType.Optional)]
      public const string FontFile3 = "/FontFile3";

      /// <summary>
      /// (Optional; meaningful only in Type 1 fonts; PDF 1.1) A string listing the character
      /// names defined in a font subset. The names in this string must be in PDF syntax—that is,
      /// each name preceded by a slash (/). The names can appear in any order. The name .notdef
      /// should be omitted; it is assumed to exist in the font subset. If this entry is absent,
      /// the only indication of a font subset is the subset tag in the FontName entry.
      /// </summary>
      [KeyInfo(KeyType.String | KeyType.Optional)]
      public const string CharSet = "/CharSet";

      /// <summary>
      /// Gets the KeysMeta for these keys.
      /// </summary>
      public static DictionaryMeta Meta
      {
        get
        {
          if (Keys.meta == null)
            Keys.meta = CreateMeta(typeof(Keys));
          return Keys.meta;
        }
      }
      static DictionaryMeta meta;
    }

    /// <summary>
    /// Gets the KeysMeta of this dictionary type.
    /// </summary>
    internal override DictionaryMeta Meta
    {
      get { return Keys.Meta; }
    }
  }
}
