/****************************************************************************
Copyright (c) 2013      Zynga Inc.
Copyright (c) 2013-2014 Chukong Technologies Inc.
 
http://www.cocos2d-x.org

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.
****************************************************************************/

#include <stdio.h>
#include <algorithm>

#include "ccUTF8.h"
#include "CCFontFreeType.h"
#include "CCTextImage.h"
#include "CCFont.h"
#include "CCFontDefinition.h"

NS_CC_BEGIN


FT_Library FontFreeType::_FTlibrary;
bool       FontFreeType::_FTInitialized = false;

FontFreeType * FontFreeType::create(const std::string &fontName, int fontSize, GlyphCollection glyphs, const char *customGlyphs)
{
    bool  dynamicGlyphCollection = false;
    if(glyphs == GlyphCollection::DYNAMIC)
        dynamicGlyphCollection = true;
    
    FontFreeType *tempFont =  new FontFreeType(dynamicGlyphCollection);

    if (!tempFont)
        return nullptr;
    
    tempFont->setCurrentGlyphCollection(glyphs, customGlyphs);
    
    if (!tempFont->createFontObject(fontName, fontSize))
    {
        delete tempFont;
        return nullptr;
    }
    return tempFont;
}

bool FontFreeType::initFreeType()
{
    if (_FTInitialized == false)
    {
        // begin freetype
        if (FT_Init_FreeType( &_FTlibrary ))
            return false;
        
        _FTInitialized = true;
    }
    
    return  _FTInitialized;
}

void FontFreeType::shutdownFreeType()
{
    if (_FTInitialized == true)
    {
        FT_Done_FreeType(_FTlibrary);
        _FTInitialized = false;
    }
}

FT_Library FontFreeType::getFTLibrary()
{
    initFreeType();
    return _FTlibrary;
}

FontFreeType::FontFreeType(bool dynamicGlyphCollection)
: _fontRef(nullptr),
_letterPadding(5),
_dynamicGlyphCollection(dynamicGlyphCollection)
{
    if(_distanceFieldEnabled)
        _letterPadding += 2 * DistanceMapSpread;
}

bool FontFreeType::createFontObject(const std::string &fontName, int fontSize)
{
    FT_Face face;

    _ttfData = FileUtils::getInstance()->getDataFromFile(fontName);
    
    if (_ttfData.isNull())
        return false;

    // create the face from the data
    if (FT_New_Memory_Face(getFTLibrary(), _ttfData.getBytes(), _ttfData.getSize(), 0, &face ))
        return false;

    //we want to use unicode
    if (FT_Select_Charmap(face, FT_ENCODING_UNICODE))
        return false;

    // set the requested font size
    int dpi = 72;
    int fontSizePoints = (int)(64.f * fontSize);
    if (FT_Set_Char_Size(face, fontSizePoints, fontSizePoints, dpi, dpi))
        return false;
    
    // store the face globally
    _fontRef = face;
    
    // save font name locally
    _fontName = fontName;
    
    // done and good
    return true;
}

FontFreeType::~FontFreeType()
{
    if (_fontRef)
    {
        FT_Done_Face(_fontRef);
    }
}

FontAtlas * FontFreeType::createFontAtlas()
{
    if (_dynamicGlyphCollection)
    {
        FontAtlas *atlas = new FontAtlas(*this);
        this->release();
        return atlas;
    } 
    else
    {
        FontDefinitionTTF *def = FontDefinitionTTF::create(this);

        if (!def)
            return nullptr;

        FontAtlas *atlas = def->createFontAtlas();

        return atlas;
    }   
}

bool FontFreeType::getBBOXFotChar(unsigned short theChar, Rect &outRect) const
{
    if (!_fontRef)
        return false;
    
    // get the ID to the char we need
    int glyph_index = FT_Get_Char_Index(_fontRef, theChar);
    
    if (!glyph_index)
        return false;
    
    // load glyph infos
    if (FT_Load_Glyph(_fontRef, glyph_index, FT_LOAD_DEFAULT))
        return false;
    
    // store result in the passed rectangle
    outRect.origin.x    = 0;
    outRect.origin.y    = - (_fontRef->glyph->metrics.horiBearingY >> 6);
    outRect.size.width  =   (_fontRef->glyph->metrics.width  >> 6);
    outRect.size.height =   (_fontRef->glyph->metrics.height >> 6);
    
    return true;
}

GlyphDef * FontFreeType::getGlyphDefintionsForText(const char *text, int &outNumGlyphs, bool UTF16text) const
{
    unsigned short* utf16String = 0;
    
    if (UTF16text)
    {
        utf16String = (unsigned short*) text;
    }
    else
    {
        utf16String = cc_utf8_to_utf16(text);
    }
    
    //
    if  (!utf16String)
        return 0;
    
    int numChar = cc_wcslen(utf16String);
    if (!numChar)
        return 0;

    // allocate the needed Glyphs
    GlyphDef *glyphs = new GlyphDef[numChar];
    assert(glyphs != nullptr);
    if (!glyphs)
        return 0;
    
    // sore result as CCRect
    for (int c = 0; c < numChar; ++c)
    {
        Rect tempRect;
        
        if (!getBBOXFotChar(utf16String[c], tempRect))
        {
            log("Warning: Cannot find definition for glyph: %c in font:%s", utf16String[c], _fontName.c_str());
            
            tempRect.origin.x       = 0;
            tempRect.origin.y       = 0;
            tempRect.size.width     = 0;
            tempRect.size.height    = 0;
            
            glyphs[c].setRect(tempRect);
            glyphs[c].setUTF16Letter(utf16String[c]);
            glyphs[c].setValid(false);
            glyphs[c].setPadding(_letterPadding);
        }
        else
        {
            glyphs[c].setRect(tempRect);
            glyphs[c].setUTF16Letter(utf16String[c]);
            glyphs[c].setPadding(_letterPadding);
            glyphs[c].setValid(true);
        }
    }
    
    outNumGlyphs = numChar;
    
    // free memory
    if (!UTF16text)
        delete [] utf16String;
    
    // done
    return glyphs;
}

Size * FontFreeType::getAdvancesForTextUTF16(unsigned short *text, int &outNumLetters) const
{
    if (!text)
        return 0;
    
    outNumLetters = cc_wcslen(text);

    if (!outNumLetters)
        return 0;
    
    Size *sizes = new Size[outNumLetters];
    if (!sizes)
        return 0;
    
    for (int c = 0; c < outNumLetters; ++c)
    {
        int advance = 0;
        int kerning = 0;
        
        advance = getAdvanceForChar(text[c]) - getBearingXForChar(text[c]);
        
        if (c < (outNumLetters-1))
            kerning = getHorizontalKerningForChars(text[c], text[c+1]);
        
        sizes[c].width = (advance + kerning);
    }
    
    return sizes;
}

int FontFreeType::getAdvanceForChar(unsigned short theChar) const
{
    if (!_fontRef)
        return 0;
    
    // get the ID to the char we need
    int glyph_index = FT_Get_Char_Index(_fontRef, theChar);
    
    if (!glyph_index)
        return 0;
    
    // load glyph infos
    if (FT_Load_Glyph(_fontRef, glyph_index, FT_LOAD_DEFAULT))
        return 0;
    
    // get to the advance for this glyph
    return (static_cast<int>(_fontRef->glyph->advance.x >> 6));
}

int FontFreeType::getBearingXForChar(unsigned short theChar) const
{
    
    if (!_fontRef)
        return 0;
    
    // get the ID to the char we need
    int glyphIndex = FT_Get_Char_Index(_fontRef, theChar);
    
    if (!glyphIndex)
        return 0;
    
    // load glyph infos
    if (FT_Load_Glyph(_fontRef, glyphIndex, FT_LOAD_DEFAULT))
        return 0;
    
    return (static_cast<int>(_fontRef->glyph->metrics.horiBearingX >>6));
}

int  FontFreeType::getHorizontalKerningForChars(unsigned short firstChar, unsigned short secondChar) const
{
    if (!_fontRef)
        return 0;

    bool hasKerning = FT_HAS_KERNING( _fontRef ) != 0;
    
    if (!hasKerning)
        return 0;
    
    // get the ID to the char we need
    int glyphIndex1 = FT_Get_Char_Index(_fontRef, firstChar);
    
    if (!glyphIndex1)
        return 0;
    
    // get the ID to the char we need
    int glyphIndex2 = FT_Get_Char_Index(_fontRef, secondChar);
    
    if (!glyphIndex2)
        return 0;
    
    FT_Vector kerning;
    
    if (FT_Get_Kerning( _fontRef, glyphIndex1, glyphIndex2,  FT_KERNING_DEFAULT,  &kerning))
        return 0;
    
    return (static_cast<int>(kerning.x >> 6));
}

int FontFreeType::getFontMaxHeight() const
{
    return (static_cast<int>(_fontRef->size->metrics.height >> 6));
}

unsigned char * FontFreeType::getGlyphBitmap(unsigned short theChar, int &outWidth, int &outHeight) const
{
    if (!_fontRef)
        return 0;
    
    if (_distanceFieldEnabled)
    {    
        if (FT_Load_Char(_fontRef,theChar,FT_LOAD_RENDER | FT_LOAD_NO_HINTING | FT_LOAD_NO_AUTOHINT))
            return 0;
    }
    else
    {
        if (FT_Load_Char(_fontRef,theChar,FT_LOAD_RENDER))
            return 0;
    }
    
    outWidth  = _fontRef->glyph->bitmap.width;
    outHeight = _fontRef->glyph->bitmap.rows;
    
    // return the pointer to the bitmap
    return _fontRef->glyph->bitmap.buffer;
}

int FontFreeType::getLetterPadding() const
{
    return _letterPadding;
}

NS_CC_END