/****************************************************************************
Copyright (c) 2020 Xiamen Yaji Software Co., Ltd.

http://www.cocos.com

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 "CCTTFLabelAtlasCache.h"

#include "platform/CCFileUtils.h"

#include <cmath>
#include <cassert>
#include "base/ccConfig.h"
#if CC_ENABLE_TTF_LABEL_RENDERER

#define FTT_MAP_FONT_SIZE 0
#define FTT_USE_FONT_MAP_SIZE_POWEROFTWO 0

#define FTT_TEXTURE_SIZE 1024

namespace cocos2d {

    namespace {
        TTFLabelAtlasCache *_instance = nullptr;


        /**
        * Labels of different size can share a same FontAtlas by mapping font size.
        */
#if FTT_MAP_FONT_SIZE
        inline int mapFontSize(float x) {
#if FTT_USE_FONT_MAP_SIZE_POWEROFTWO
            // round to power of 2, which waste lots of memory?
            return 1 << (int)(::ceil(::log(x) / ::log(2.0))); 
#else
            if (x <= 8.0f) return 8;
            else if (x <= 16.0f) return 16;
            else if (x <= 32.0f) return 32;
            else if (x <= 48.0f) return 48;
            return (int)x;
#endif
        }
#else
#define mapFontSize(f) (int)(f)
#endif
    }


    TTFLabelAtlas::TTFLabelAtlas(const std::string &fontPath, float fontSize, LabelLayoutInfo *info)
        :_fontName(fontPath), _fontSize(fontSize), _info(info)
    {
    }


    bool TTFLabelAtlas::init()
    {
        assert(FileUtils::getInstance()->isFileExist(_fontName));
        _ttfFont = std::make_shared<FontFreeType>(_fontName, _fontSize, _info);
        
        if(!_ttfFont->loadFont()){
            return false;
        }
        _fontAtlas = std::make_shared<FontAtlas>(PixelMode::A8, FTT_TEXTURE_SIZE, FTT_TEXTURE_SIZE, _info->outlineSize > 0 || _info->bold);
        _fontAtlas->init();
        return true;
    }

    TTFLabelAtlasCache * TTFLabelAtlasCache::getInstance()
    {
        if (!_instance)
        {
            _instance = new TTFLabelAtlasCache();
        }
        return _instance;
    }

    void TTFLabelAtlasCache::destroyInstance()
    {
        delete _instance;
        _instance = nullptr;
    }

    void TTFLabelAtlasCache::reset()
    {
        _cache.clear();
    }

    std::shared_ptr<TTFLabelAtlas> TTFLabelAtlasCache::load(const std::string &font, float fontSizeF, LabelLayoutInfo *info)
    {
        int fontSize = mapFontSize(fontSizeF);
        std::string keybuffer = cacheKeyFor(font, fontSize, info);
#if CC_TTF_LABELATLAS_ENABLE_GC
        std::weak_ptr<TTFLabelAtlas> &atlasWeak= _cache[keybuffer];
        std::shared_ptr<TTFLabelAtlas> atlas = atlasWeak.lock();
        if (!atlas)
        {
            atlas = std::make_shared<TTFLabelAtlas>(font, fontSize, info);
            if(!atlas->init())
            {
                return nullptr;
            }
            atlasWeak = atlas;
        }
#else
        std::shared_ptr<TTFLabelAtals> &atlas = _cache[keybuffer];
        if (!atlas)
        {
            atlas = std::make_shared<TTFLabelAtals>(font, fontSize, info);
            if(!atlas->init())
            {
                return nullptr;
            }
        }
#endif
        return atlas;
    }


    void TTFLabelAtlasCache::unload(TTFLabelAtlas *atlas)
    {
        int fontSize = mapFontSize(atlas->_fontSize);
        std::string key = cacheKeyFor(atlas->_fontName, fontSize, atlas->_info);
        _cache.erase(key);
    }


    std::string TTFLabelAtlasCache::cacheKeyFor(const std::string &font, int fontSize, LabelLayoutInfo * info)
    {
        char keybuffer[512] = { 0 };
        std::string fullPath = FileUtils::getInstance()->fullPathForFilename(font);

        //NOTICE: fontpath may be too long
        snprintf(keybuffer, 511, "s:%d/sdf:%d/p:%s", fontSize, info->outlineSize > 0 || info->bold, fullPath.c_str());
        return keybuffer;
    }
}

#endif