/*
 * Copyright (c) 2010-2012 OTClient <https://github.com/edubart/otclient>
 *
 * 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 "spritemanager.h"
#include <framework/core/resourcemanager.h>
#include <framework/core/eventdispatcher.h>
#include <framework/graphics/graphics.h>

SpriteManager g_sprites;

SpriteManager::SpriteManager()
{
    m_spritesCount = 0;
    m_signature = 0;
}

bool SpriteManager::load(const std::string& file)
{
    try {
        g_resources.loadFile(file, m_fin);
        m_signature = Fw::getU32(m_fin);
        m_spritesCount = Fw::getU16(m_fin);
        m_sprites.resize(m_spritesCount);
        m_loaded = true;
        return true;
    } catch(Exception& e) {
        logError("Failed to load sprites from '", file, "': ", e.what());
        return false;
    }
}

void SpriteManager::unload()
{
    m_sprites.clear();
    m_spritesCount = 0;
    m_signature = 0;
}

void SpriteManager::preloadSprites()
{
    // preload every 100 sprites, periodically
    const int burst = 50;
    const int interval = 10;
    auto preload = [this](int start) {
        for(int i=start;i<start+burst && i<=m_spritesCount;++i) {
            loadSpriteTexture(i);
        }
    };

    for(int i=1;i<=m_spritesCount;i+=burst)
        g_dispatcher.scheduleEvent(std::bind(preload, i), (i/burst) * interval);
}

TexturePtr SpriteManager::loadSpriteTexture(int id)
{
    m_fin.seekg(((id-1) * 4) + 6, std::ios_base::beg);

    uint32 spriteAddress = Fw::getU32(m_fin);

    // no sprite? return an empty texture
    if(spriteAddress == 0)
        return g_graphics.getEmptyTexture();

    m_fin.seekg(spriteAddress, std::ios_base::beg);
    assert(m_fin.good());

    // skip color key
    Fw::getU8(m_fin);
    Fw::getU8(m_fin);
    Fw::getU8(m_fin);

    uint16 pixelDataSize = Fw::getU16(m_fin);

    static std::vector<uint8> pixels(4096);
    int writePos = 0;
    int read = 0;

    // decompress pixels
    while(read < pixelDataSize) {
        uint16 transparentPixels, coloredPixels;
        m_fin.read((char*)&transparentPixels, 2);
        m_fin.read((char*)&coloredPixels, 2);

        if(writePos + transparentPixels*4 + coloredPixels*3 >= 4096)
            return g_graphics.getEmptyTexture();

        for(int i = 0; i < transparentPixels; i++) {
            pixels[writePos + 0] = 0x00;
            pixels[writePos + 1] = 0x00;
            pixels[writePos + 2] = 0x00;
            pixels[writePos + 3] = 0x00;
            writePos += 4;
        }

        for(int i = 0; i < coloredPixels; i++) {
            pixels[writePos + 0] = Fw::getU8(m_fin);
            pixels[writePos + 1] = Fw::getU8(m_fin);
            pixels[writePos + 2] = Fw::getU8(m_fin);
            pixels[writePos + 3] = 0xFF;

            writePos += 4;
        }

        read += 4 + (3 * coloredPixels);
    }

    // fill remaining pixels with alpha
    while(writePos < 4096) {
        pixels[writePos + 0] = 0x00;
        pixels[writePos + 1] = 0x00;
        pixels[writePos + 2] = 0x00;
        pixels[writePos + 3] = 0x00;
        writePos += 4;
    }

    TexturePtr spriteTex(new Texture(32, 32, 4, &pixels[0]));
    spriteTex->setSmooth(true);
    spriteTex->generateBilinearMipmaps(pixels);
    return spriteTex;
}

TexturePtr SpriteManager::getSpriteTexture(int id)
{
    if(id == 0)
        return g_graphics.getEmptyTexture();

    assert(id > 0 && id <= m_spritesCount);

    // load sprites on demand
    TexturePtr& sprite = m_sprites[id-1];
    if(!sprite)
        sprite = loadSpriteTexture(id);

    //TODO: release unused sprites textures after X seconds
    // to avoid massive texture allocations
    return sprite;
}