/*
   orxonox - the future of 3D-vertical-scrollers

   Copyright (C) 2004 orx

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.

   ### File Specific:
   main-programmer: Benjamin Grauer
   co-programmer: ...
*/

#define DEBUG_SPECIAL_MODULE DEBUG_MODULE_FONT

#include "font.h"
#include "text.h"

#ifdef HAVE_SDL_IMAGE_H
#include <SDL_image.h>
#else
#include <SDL/SDL_image.h>
#endif
#include "font.xpm"

#include "debug.h"
#include "compiler.h"

using namespace std;

/**
 * constructs a Font
 * @param fontFile the File to load the font from
 * @param fontSize the Size of the Font in Pixels
 */
Font::Font(const char* fontFile, unsigned int fontSize)
{
  this->init();

  this->setSize(fontSize);

  if (fontFile != NULL)
    this->loadFont(fontFile);

  this->setStyle("c");//TTF_STYLE_NORMAL);

  this->fastTextureID = this->createFastTexture();


//  this->createAsciiImage("test.bmp");
}

/**
 * constructs a Font
 * @param fontFile the File to load the font from
 * @param fontSize the Size of the Font in Pixels
 */
Font::Font(char** xpmArray)
{
  this->init();

  //  this->setSize(fontSize);
  SDL_Surface* image = NULL;
  if (xpmArray != NULL)
    image = IMG_ReadXPMFromArray(xpmArray);
  if (image != NULL)
  {
    this->loadFontFromSDL_Surface(image);
    SDL_FreeSurface(image);
  }
  else
    PRINTF(1)("loading from surface failed: %s\n", IMG_GetError());

}


/**
 * destructs a font
 * this releases the memory a font uses to be opened.
 * deletes the glLists, and the TTF-handler, if present.
 */
Font::~Font()
{
  // deleting all Glyphs
  if (this->glyphArray != NULL)
  {
    for (int i = 0; i < FONT_HIGHEST_KNOWN_CHAR; i++)
    {
      if (this->glyphArray[i] != NULL)
      {
        glDeleteLists(this->glyphArray[i]->displayList, 1);
        delete this->glyphArray[i];
      }
    }
    delete[] this->glyphArray;
  }

  // erease this font out of the memory.
  if (likely(this->font != NULL))
    TTF_CloseFont(this->font);
}

/**
 * initializes a Font (with default values)
 */
void Font::init()
{
  this->setClassID(CL_FONT, "Font");
  // setting default values.
  this->font = NULL;
  this->glyphArray = NULL;
  this->fastTextureID = 0;
}


/**
 * sets The Font.
 * @param fontFile The file containing the font.
 * @returns true if loaded, false if something went wrong, or if a font was loaded before.
 */
bool Font::loadFont(const char* fontFile)
{
  if (!this->getName())
  {
    this->setName(fontFile);

    this->font = TTF_OpenFont(this->getName(), this->fontSize);
    if(!this->font)
    {
      PRINTF(1)("TTF_OpenFont: %s\n", TTF_GetError());
      return false;
    }
    else
      return true;
  }
  else
  {
    PRINTF(2)("Font already initialized, unable to change it now.\n");
    return false;
  }
}

/**
 * loads a font From an XPM-array.
 * @param xpmArray the array of the XPM to load the font from.
 */
bool Font::loadFontFromSDL_Surface(SDL_Surface* surface)
{
  // loading to a texture.
  if(surface == NULL)
    return false;
  this->fastTextureID = Text::loadTexture(surface, NULL);

  // initializing the Glyphs.
  if (this->glyphArray == NULL)
  {
    float cx,cy;
    Glyph* glyph;
    this->glyphArray = new Glyph*[FONT_HIGHEST_KNOWN_CHAR];
    for (int i = 0; i < FONT_HIGHEST_KNOWN_CHAR; i++)
    {
      glyph = this->glyphArray[i] = new Glyph;
      glyph->displayList = glGenLists(1);
      if (!glIsList(glyph->displayList))
      {
        PRINTF(2)("Error creating glList for Font character %c\n", i);
        this->glyphArray[i] = NULL;
        delete glyph;
        continue;
      }
      cx=(float)(i%16)/16.0f;                  // X Position Of Current Character
      cy=(float)(i/16)/16.0f;                  // Y Position Of Current Character
      glNewList(glyph->displayList, GL_COMPILE); // Start Building A List
      glBegin(GL_QUADS);                           // Use A Quad For Each Character
      glTexCoord2f(cx, cy+0.001f);            // Texture Coord (Bottom Left)
      glVertex2d(0,-16);                            // Vertex Coord (Bottom Left)
      glTexCoord2f(cx+0.0625f, cy+0.001f);    // Texture Coord (Bottom Right)
      glVertex2i(16,-16);                           // Vertex Coord (Bottom Right)
      glTexCoord2f(cx+0.0625f, cy+0.0625f);     // Texture Coord (Top Right)
      glVertex2i(16,0);                            // Vertex Coord (Top Right)
      glTexCoord2f(cx, cy+0.0625f);             // Texture Coord (Top Left)
      glVertex2i(0,0);                             // Vertex Coord (Top Left)
      glEnd();                                     // Done Building Our Quad (Character)
//       glTranslated(12,0,0);                        // Move To The Right Of The Character
      glEndList();                                 // Done Building The Display List
      this->glyphArray[i]->width = 12;
    }
  }
  return true;
}


/**
 *  sets a specific renderStyle
 * @param renderStyle the Style to render: a char-array containing:
   i: italic, b: bold, u, underline
 */
void Font::setStyle(const char* renderStyle)
{
  this->renderStyle = TTF_STYLE_NORMAL;

  for (int i = 0; i < strlen(renderStyle); i++)
    if (strncmp(renderStyle+i, "b", 1) == 0)
      this->renderStyle |= TTF_STYLE_BOLD;
  else if (strncmp(renderStyle+i, "i", 1) == 0)
    this->renderStyle |= TTF_STYLE_ITALIC;
  else if (strncmp(renderStyle+i, "u", 1) == 0)
    this->renderStyle |= TTF_STYLE_UNDERLINE;

  if (likely(this->font != NULL))
    TTF_SetFontStyle(this->font, this->renderStyle);
  else
    PRINTF(2)("Font was not initialized, please do so before setting the Font-Style.\n");
}

/**
 *  Sets a new Size to the font
 * @param fontSize The new Size in pixels.
 */
void Font::setSize(unsigned int fontSize)
{
  this->fontSize = fontSize;
}

Font* Font::defaultFont = NULL;

void Font::createAsciiImage(const char* fileName)
{
  if (this->font == NULL)
    return;
  int height = this->getMaxHeight();

  //
  SDL_Color tmpColor = {0, 0, 0};
  // Surface definition.
  SDL_Rect tmpRect; // this represents a Rectangle for blitting.
  SDL_Surface* tmpSurf =  SDL_CreateRGBSurface(SDL_SWSURFACE,
                                               height*16, height*16,
                                               32,
#if SDL_BYTEORDER == SDL_LIL_ENDIAN /* OpenGL RGBA masks */
                                               0x000000FF,
                                               0x0000FF00,
                                               0x00FF0000,
                                               0xFF000000
#else
                                                   0xFF000000,
                                               0x00FF0000,
                                               0x0000FF00,
                                               0x000000FF
#endif
                                              );
  tmpRect.x = 0; tmpRect.y = 0; tmpRect.w = tmpSurf->w; tmpRect.h = tmpSurf->h;
  SDL_SetClipRect(tmpSurf, &tmpRect);
  int maxLineHeight = 0;

  int posX, posY;
  // all the interessting Glyphs
  for (posY = 0; posY < 16; posY++)
  {
    for (posX = 0; posX < 16; posX++)
    {
      SDL_Surface* glyphSurf = NULL;
      if (likely(this->font != NULL))
      {
        SDL_Color white = {255, 255, 255};
        glyphSurf = TTF_RenderGlyph_Blended(this->font, posX+16*posY, white);
      }
      if( glyphSurf != NULL )
      {
        tmpRect.x = height*posX;
        tmpRect.y = height*posY;
        SDL_SetAlpha(glyphSurf, 0, 0);

        SDL_BlitSurface(glyphSurf, NULL, tmpSurf, &tmpRect);
        SDL_FreeSurface(glyphSurf);
              // Outputting Glyphs to BMP-files.
/*
        char outname[512];
        if (i < 10)
        sprintf( outname, "%s-glyph-00%d.bmp", this->getName(), i );
        else if (i <100)
        sprintf( outname, "%s-glyph-0%d.bmp", this->getName(), i );
        else
        sprintf( outname, "%s-glyph-%d.bmp", this->getName(), i );
        SDL_SaveBMP(tmpSurf, outname);*/

      }
    }
  }
  SDL_SaveBMP(tmpSurf, fileName);
  SDL_FreeSurface(tmpSurf);
}

/**
 * initializes the default font
 */
void Font::initDefaultFont()
{
  if (Font::defaultFont == NULL)
    Font::defaultFont = new Font(font_xpm);
}

/**
 * deletes the default font
 */
void Font::removeDefaultFont()
{
  if (Font::defaultFont != NULL)
    delete Font::defaultFont;
  Font::defaultFont = NULL;
}


/**
 * @returns the maximum height of the Font, if the font was initialized, 0 otherwise
 */
int Font::getMaxHeight()
{
  if (likely (this->font != NULL))
    return TTF_FontHeight(this->font);
  else
    return 0;
}

/**
 * @returns the maximum ascent of the Font, if the font was initialized, 0 otherwise

   the ascent is the pixels of the font above the baseline
 */
int Font::getMaxAscent()
{
  if (likely(this->font != NULL))
    return TTF_FontAscent(this->font);
  else
    return 0;
}

/**
 * @returns the maximum descent of the Font, if the font was initialized, 0 otherwise

   the descent is the pixels of the font below the baseline
 */
int Font::getMaxDescent()
{
  if (likely(this->font != NULL))
    return TTF_FontDescent(this->font);
  else
    return 0;
}

/**
 * @param character The character to get info about.
 * @returns a Glyph struct of a character. This Glyph is a pointer,
   and MUST be deleted by the user..

   This only works for horizontal fonts. see
   http://freetype.sourceforge.net/freetype2/docs/tutorial/step2.html
   for more info about vertical Fonts
 */
Glyph* Font::getGlyphMetrics(Uint16 character)
{
  Glyph* rg = new Glyph;
  rg->character = character;
  if (likely (this->font!= NULL))
    TTF_GlyphMetrics(this->font, rg->character,
                     &rg->minX, &rg->maxX,
                     &rg->minY, &rg->maxY,
                     &rg->advance);
  rg->height = rg->maxY - rg->minY;
  rg->width = rg->maxX - rg->minX;
  rg->bearingX = (rg->advance - rg->width) / 2;
  rg->bearingY = rg->maxY;
  return rg;
}

/**
 * creates a Fast-Texture of this Font
 */
GLuint Font::createFastTexture()
{
  /* interesting GLYPHS:
  *  32: space
  *  33-47: Special Characters.
  *  48-57: 0-9
  *  58-63: some more special chars (minor)
  *  65-90: A-Z
  *  97-122: a-z
  */
  int numberOfGlyphs = 91;

  this->initGlyphs(32, numberOfGlyphs);
  this->glyphArray[32]->width = fontSize/2; //!< @todo find out the real size of a Space

  int rectSize = this->findOptimalFastTextureSize();

  // setting default values. (maybe not needed afterwards)
  SDL_Color tmpColor;  tmpColor.r = tmpColor.g = tmpColor.b = 0;
  // Surface definition.
  SDL_Rect tmpRect; // this represents a Rectangle for blitting.
  SDL_Surface* tmpSurf =  SDL_CreateRGBSurface(SDL_SWSURFACE,
                                               rectSize, rectSize,
                                               32,
#if SDL_BYTEORDER == SDL_LIL_ENDIAN /* OpenGL RGBA masks */
                                               0x000000FF,
                                               0x0000FF00,
                                               0x00FF0000,
                                               0xFF000000
#else
                                                   0xFF000000,
                                               0x00FF0000,
                                               0x0000FF00,
                                               0x000000FF
#endif
                                              );
  tmpRect.x = 0; tmpRect.y = 0; tmpRect.w = tmpSurf->w; tmpRect.h = tmpSurf->h;
  SDL_SetClipRect(tmpSurf, &tmpRect);
  int maxLineHeight = 0;

  // all the interessting Glyphs
  for (int i = 0; i < 128; i++)
  {
    SDL_Surface* glyphSurf = NULL;
    Glyph* tmpGlyph;

    if (tmpGlyph = this->glyphArray[i])
    {
      if (tmpGlyph->height > maxLineHeight)
        maxLineHeight = tmpGlyph->height;

      if (tmpRect.x+tmpGlyph->advance > tmpSurf->w)
      {
        tmpRect.x = 0;
        tmpRect.y = tmpRect.y + maxLineHeight + 1;
        maxLineHeight = 0;
      }
      if (tmpRect.y + maxLineHeight > tmpSurf->h)
      {
        PRINTF(1)("Protection, so font cannot write over the boundraries error (this should not heappen\n");
        break;
      }
          // reading in the new Glyph
      if (likely(this->font != NULL))
      {
        SDL_Color white = {255, 255, 255};
        glyphSurf = TTF_RenderGlyph_Blended(this->font, i, white);
      }
      if( glyphSurf != NULL )
      {
        SDL_SetAlpha(glyphSurf, 0, 0);

        SDL_BlitSurface(glyphSurf, NULL, tmpSurf, &tmpRect);
        TexCoord tmpTexCoord;
        tmpTexCoord.minU = (float)tmpRect.x/(float)tmpSurf->w;
        tmpTexCoord.maxU = (float)(tmpRect.x + tmpGlyph->advance)/(float)tmpSurf->w;
        tmpTexCoord.minV = (float)(tmpRect.y)/(float)tmpSurf->w;
        tmpTexCoord.maxV = (float)(tmpRect.y+tmpGlyph->height)/(float)tmpSurf->w;
        tmpGlyph->displayList = glGenLists(1);

        glNewList(tmpGlyph->displayList, GL_COMPILE);
        glBegin(GL_QUADS);
        glTexCoord2f(tmpTexCoord.minU, tmpTexCoord.minV);
        glVertex2d(0, - tmpGlyph->bearingY);
        glTexCoord2f(tmpTexCoord.minU, tmpTexCoord.maxV);
        glVertex2d(0, tmpGlyph->height - tmpGlyph->bearingY);
        glTexCoord2f(tmpTexCoord.maxU, tmpTexCoord.maxV);
        glVertex2d(tmpGlyph->width, tmpGlyph->height - tmpGlyph->bearingY);
        glTexCoord2f(tmpTexCoord.maxU, tmpTexCoord.minV);
        glVertex2d(tmpGlyph->width, - tmpGlyph->bearingY);
        glEnd();
        glEndList();
        SDL_FreeSurface(glyphSurf);

        tmpRect.x += tmpGlyph->advance;

              // Outputting Glyphs to BMP-files.
/*
        char outname[512];
        if (i < 10)
        sprintf( outname, "%s-glyph-00%d.bmp", this->getName(), i );
        else if (i <100)
        sprintf( outname, "%s-glyph-0%d.bmp", this->getName(), i );
        else
        sprintf( outname, "%s-glyph-%d.bmp", this->getName(), i );
        SDL_SaveBMP(tmpSurf, outname);*/

      }
    }
  }

  GLuint texture;
  glGenTextures(1, &texture);
  glBindTexture(GL_TEXTURE_2D, texture);
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
  glTexImage2D(GL_TEXTURE_2D,
               0,
               GL_RGBA,
               tmpSurf->w, tmpSurf->h,
               0,
               GL_RGBA,
               GL_UNSIGNED_BYTE,
               tmpSurf->pixels);
  SDL_FreeSurface(tmpSurf);
  return texture;
}

/**
 *  stores Glyph Metrics in an Array.
 * @param from The Glyph to start from.
 * @param count The number of Glyphs to start From.
 */
void Font::initGlyphs(Uint16 from, Uint16 count)
{
  /* initialize the Array, and set all its entries to NULL
  *  only if the Glyph-array has not been initialized
  */
  if (!this->glyphArray)
  {
    this->glyphArray = new Glyph*[FONT_HIGHEST_KNOWN_CHAR];
    for (int i = 0; i < FONT_HIGHEST_KNOWN_CHAR; i++)
      this->glyphArray[i] = NULL;
  }

  Uint16 lastGlyph = from + count;

  for (int i = from; i <= lastGlyph; i++)
  {
      // setting up all the Glyphs we like.
    glyphArray[i] = getGlyphMetrics(i);
  }
  return;
}

/**
 * @returns the optimal size to use as the texture size

   @todo: this algorithm can be a lot more faster, althought it does
   not really matter within the init-context, and 128 glyphs.

   This function searches for a 2^n sizes texture-size, this is for
   openGL-version < 1.2 compatibility ( and because it is realy easy like this :))
 */
int Font::findOptimalFastTextureSize()
{
  int i;
  int x,y; // the counters
  int maxLineHeight = this->getMaxHeight();
  unsigned int size = 32;  // starting Value, we have to start somewhere 32 seems reasonable. (take any small enough 2^i number)
  bool sizeOK = false;
  Glyph* tmpGlyph;

  while (!sizeOK)
  {
    x = 0; y = 0;
    for (i = 0; i <= FONT_HIGHEST_KNOWN_CHAR; i++)
    {
      if((tmpGlyph = this->glyphArray[i]) != NULL)
      {
              // getting the height of the highest Glyph in the Line.
        if (tmpGlyph->height > maxLineHeight)
          maxLineHeight = tmpGlyph->height;

        if (x + tmpGlyph->advance > size)
        {
          x = 0;
          y = y + maxLineHeight;
                  //maxLineHeight = 0;
        }
        if (y + maxLineHeight + 1 > size)
          break;
        x += tmpGlyph->advance;

      }
    }
    if (i >= FONT_HIGHEST_KNOWN_CHAR-1 || size > 8192)
      sizeOK = true;
    else
      size *= 2;
  }
  return size;
}


/**
 *  a simple function to get some interesting information about this class
 */
void Font::debug()
{
  // print the loaded font's style
  int style;
  if (likely(this->font != NULL))
    style = TTF_GetFontStyle(this->font);
  PRINTF(0)("The font style is:");
  if(style==TTF_STYLE_NORMAL)
    PRINTF(0)(" normal");
  else {
    if(style&TTF_STYLE_BOLD)
      PRINTF(0)(" bold");
    if(style&TTF_STYLE_ITALIC)
      PRINTF(0)(" italic");
    if(style&TTF_STYLE_UNDERLINE)
      PRINTF(0)(" underline");
  }
  PRINTF(0)("\n");
}