/****************************************************************************
Copyright (c) 2009      On-Core
Copyright (c) 2010-2012 cocos2d-x.org
Copyright (c) 2013-2016 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 "2d/CCGrid.h"

#include "base/ccMacros.h"
#include "base/ccUtils.h"
#include "2d/CCNode.h"
#include "2d/CCGrabber.h"
#include "renderer/CCGLProgram.h"
#include "renderer/CCGLProgramCache.h"
#include "renderer/ccGLStateCache.h"
#include "renderer/CCRenderer.h"
#include "renderer/CCRenderState.h"
#include "renderer/CCTexture2D.h"
#include "platform/CCGL.h"
#include "2d/CCCamera.h"

NS_CC_BEGIN
// implementation of GridBase

GridBase* GridBase::create(const Size& gridSize)
{
    GridBase *pGridBase = new (std::nothrow) GridBase();

    if (pGridBase)
    {
        if (pGridBase->initWithSize(gridSize))
        {
            pGridBase->autorelease();
        }
        else
        {
            CC_SAFE_RELEASE_NULL(pGridBase);
        }
    }

    return pGridBase;
}

GridBase* GridBase::create(const Size& gridSize, Texture2D *texture, bool flipped)
{
    GridBase *pGridBase = new (std::nothrow) GridBase();

    if (pGridBase)
    {
        if (pGridBase->initWithSize(gridSize, texture, flipped))
        {
            pGridBase->autorelease();
        }
        else
        {
            CC_SAFE_RELEASE_NULL(pGridBase);
        }
    }

    return pGridBase;
}

bool GridBase::initWithSize(const Size& gridSize)
{
    return initWithSize(gridSize, Rect::ZERO);
}

bool GridBase::initWithSize(const cocos2d::Size &gridSize, const cocos2d::Rect &rect)
{
    Director *director = Director::getInstance();
    Size s = director->getWinSizeInPixels();
    
    auto POTWide = ccNextPOT((unsigned int)s.width);
    auto POTHigh = ccNextPOT((unsigned int)s.height);
    
    // we only use rgba8888
    Texture2D::PixelFormat format = Texture2D::PixelFormat::RGBA8888;
    
    auto dataLen = POTWide * POTHigh * 4;
    void *data = calloc(dataLen, 1);
    if (! data)
    {
        CCLOG("cocos2d: Grid: not enough memory.");
        this->release();
        return false;
    }
    
    Texture2D *texture = new (std::nothrow) Texture2D();
    texture->initWithData(data, dataLen,  format, POTWide, POTHigh, s);
    
    free(data);
    
    if (! texture)
    {
        CCLOG("cocos2d: Grid: error creating texture");
        return false;
    }
    
    initWithSize(gridSize, texture, false, rect);
    
    texture->release();
    
    return true;
}

bool GridBase::initWithSize(const Size& gridSize, Texture2D *texture, bool flipped)
{
    return initWithSize(gridSize, texture, flipped, Rect::ZERO);
}

bool GridBase::initWithSize(const Size& gridSize, Texture2D *texture, bool flipped, const Rect& rect)
{
    bool ret = true;
    
    _active = false;
    _reuseGrid = 0;
    _gridSize = gridSize;
    
    _texture = texture;
    CC_SAFE_RETAIN(_texture);
    _isTextureFlipped = flipped;
    
    if (rect.equals(Rect::ZERO)) {
        auto size = _texture->getContentSize();
        _gridRect.setRect(0, 0, size.width, size.height);
    }
    else{
        _gridRect = rect;
    }
    _step.x = _gridRect.size.width/_gridSize.width;
    _step.y = _gridRect.size.height/_gridSize.height;
    
    _grabber = new (std::nothrow) Grabber();
    if (_grabber)
    {
        _grabber->grab(_texture);
    }
    else
    {
        ret = false;
    }
    
    _shaderProgram = GLProgramCache::getInstance()->getGLProgram(GLProgram::SHADER_NAME_POSITION_TEXTURE);
    calculateVertexPoints();
    
    return ret;
}

GridBase::~GridBase(void)
{
    CCLOGINFO("deallocing GridBase: %p", this);

    //TODO: ? why 2.0 comments this line:        setActive(false);
    CC_SAFE_RELEASE(_texture);
    CC_SAFE_RELEASE(_grabber);
}

// properties
void GridBase::setActive(bool active)
{
    _active = active;
    if (! active)
    {
        Director *pDirector = Director::getInstance();
        Director::Projection proj = pDirector->getProjection();
        pDirector->setProjection(proj);
    }
}

void GridBase::setTextureFlipped(bool flipped)
{
    if (_isTextureFlipped != flipped)
    {
        _isTextureFlipped = flipped;
        calculateVertexPoints();
    }
}

void GridBase::set2DProjection()
{
    Director *director = Director::getInstance();
    Size    size = director->getWinSizeInPixels();
    
    director->loadIdentityMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_PROJECTION);

    Mat4 orthoMatrix;
    Mat4::createOrthographicOffCenter(0, size.width, 0, size.height, -1, 1, &orthoMatrix);
    director->multiplyMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_PROJECTION, orthoMatrix);

    director->loadIdentityMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW);

    GL::setProjectionMatrixDirty();
}

void GridBase::setGridRect(const cocos2d::Rect &rect)
{
    _gridRect = rect;
}

void GridBase::beforeDraw(void)
{
    // save projection
    Director *director = Director::getInstance();
    _directorProjection = director->getProjection();

    // 2d projection
    //    [director setProjection:Director::Projection::_2D];
    set2DProjection();
    
    Size    size = director->getWinSizeInPixels();
    glViewport(0, 0, (GLsizei)(size.width), (GLsizei)(size.height) );
    _grabber->beforeRender(_texture);
}

void GridBase::afterDraw(cocos2d::Node *target)
{
    _grabber->afterRender(_texture);

    // restore projection
    Director *director = Director::getInstance();
    director->setProjection(_directorProjection);

    director->setViewport();
    const auto& vp = Camera::getDefaultViewport();
    glViewport(vp._left, vp._bottom, vp._width, vp._height);
//    if (target->getCamera()->isDirty())
//    {
//        Vec2 offset = target->getAnchorPointInPoints();
//
//        //
//        // FIXME: Camera should be applied in the AnchorPoint
//        //
//        kmGLTranslatef(offset.x, offset.y, 0);
//        target->getCamera()->locate();
//        kmGLTranslatef(-offset.x, -offset.y, 0);
//    }

    GL::bindTexture2D(_texture->getName());

    // restore projection for default FBO .fixed bug #543 #544
    //TODO:         Director::getInstance()->setProjection(Director::getInstance()->getProjection());
    //TODO:         Director::getInstance()->applyOrientation();
    beforeBlit();
    blit();
    afterBlit();
}

void GridBase::blit(void)
{
    CCASSERT(0, "Subclass should implement it.");
}

void GridBase::reuse(void)
{
    CCASSERT(0, "Subclass should implement it!");
}

void GridBase::calculateVertexPoints(void)
{
    CCASSERT(0, "Subclass should implement it.");
}

// implementation of Grid3D

Grid3D* Grid3D::create(const Size& gridSize)
{
    Grid3D *ret= new (std::nothrow) Grid3D();

    if (ret)
    {
        if (ret->initWithSize(gridSize))
        {
            ret->autorelease();
        }
        else
        {
            delete ret;
            ret = nullptr;
        }
    }

    return ret;
}

Grid3D* Grid3D::create(const Size& gridSize, const Rect& rect)
{
    Grid3D *ret= new (std::nothrow) Grid3D();
    
    if (ret)
    {
        if (ret->initWithSize(gridSize, rect))
        {
            ret->autorelease();
        }
        else
        {
            delete ret;
            ret = nullptr;
        }
    }
    
    return ret;
}

Grid3D* Grid3D::create(const Size& gridSize, Texture2D *texture, bool flipped)
{
    Grid3D *ret= new (std::nothrow) Grid3D();
    
    if (ret)
    {
        if (ret->initWithSize(gridSize, texture, flipped))
        {
            ret->autorelease();
        }
        else
        {
            delete ret;
            ret = nullptr;
        }
    }
    
    return ret;
}

Grid3D* Grid3D::create(const Size& gridSize, Texture2D *texture, bool flipped, const Rect& rect)
{
    Grid3D *ret= new (std::nothrow) Grid3D();
    
    if (ret)
    {
        if (ret->initWithSize(gridSize, texture, flipped, rect))
        {
            ret->autorelease();
        }
        else
        {
            delete ret;
            ret = nullptr;
        }
    }
    
    return ret;
}


Grid3D::Grid3D()
: _texCoordinates(nullptr)
, _vertices(nullptr)
, _originalVertices(nullptr)
, _indices(nullptr)
, _needDepthTestForBlit(false)
{

}

Grid3D::~Grid3D(void)
{
    CC_SAFE_FREE(_texCoordinates);
    CC_SAFE_FREE(_vertices);
    CC_SAFE_FREE(_indices);
    CC_SAFE_FREE(_originalVertices);
}

void Grid3D::beforeBlit()
{
    if(_needDepthTestForBlit)
    {
        _oldDepthTestValue = glIsEnabled(GL_DEPTH_TEST) != GL_FALSE;
        GLboolean depthWriteMask;
        glGetBooleanv(GL_DEPTH_WRITEMASK, &depthWriteMask);
		_oldDepthWriteValue = depthWriteMask != GL_FALSE;
        CHECK_GL_ERROR_DEBUG();

        glEnable(GL_DEPTH_TEST);
        RenderState::StateBlock::_defaultState->setDepthTest(true);

        glDepthMask(true);
        RenderState::StateBlock::_defaultState->setDepthWrite(true);
    }
}

void Grid3D::afterBlit()
{
    if(_needDepthTestForBlit)
    {
        if(_oldDepthTestValue)
            glEnable(GL_DEPTH_TEST);
        else
            glDisable(GL_DEPTH_TEST);
        RenderState::StateBlock::_defaultState->setDepthTest(_oldDepthTestValue);

        glDepthMask(_oldDepthWriteValue);
        RenderState::StateBlock::_defaultState->setDepthWrite(_oldDepthWriteValue);
    }
}

void Grid3D::blit(void)
{
    int n = _gridSize.width * _gridSize.height;

    GL::enableVertexAttribs( GL::VERTEX_ATTRIB_FLAG_POSITION | GL::VERTEX_ATTRIB_FLAG_TEX_COORD );
    _shaderProgram->use();
    _shaderProgram->setUniformsForBuiltins();;

    //
    // Attributes
    //

    // position
    glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_POSITION, 3, GL_FLOAT, GL_FALSE, 0, _vertices);

    // texCoords
    glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_TEX_COORD, 2, GL_FLOAT, GL_FALSE, 0, _texCoordinates);

    glDrawElements(GL_TRIANGLES, (GLsizei) n*6, GL_UNSIGNED_SHORT, _indices);
}

void Grid3D::calculateVertexPoints(void)
{
    float width = (float)_texture->getPixelsWide();
    float height = (float)_texture->getPixelsHigh();
    float imageH = _texture->getContentSizeInPixels().height;

    int x, y, i;
    CC_SAFE_FREE(_vertices);
    CC_SAFE_FREE(_originalVertices);
    CC_SAFE_FREE(_texCoordinates);
    CC_SAFE_FREE(_indices);

    unsigned int numOfPoints = (_gridSize.width+1) * (_gridSize.height+1);

    _vertices = malloc(numOfPoints * sizeof(Vec3));
    _originalVertices = malloc(numOfPoints * sizeof(Vec3));
    _texCoordinates = malloc(numOfPoints * sizeof(Vec2));
    _indices = (GLushort*)malloc(_gridSize.width * _gridSize.height * sizeof(GLushort) * 6);

    GLfloat *vertArray = (GLfloat*)_vertices;
    GLfloat *texArray = (GLfloat*)_texCoordinates;
    GLushort *idxArray = _indices;

    for (x = 0; x < _gridSize.width; ++x)
    {
        for (y = 0; y < _gridSize.height; ++y)
        {
            int idx = (y * _gridSize.width) + x;

            GLfloat x1 = x * _step.x + _gridRect.origin.x;
            GLfloat x2 = x1 + _step.x;
            GLfloat y1 = y * _step.y + _gridRect.origin.y;
            GLfloat y2= y1 + _step.y;

            GLushort a = (GLushort)(x * (_gridSize.height + 1) + y);
            GLushort b = (GLushort)((x + 1) * (_gridSize.height + 1) + y);
            GLushort c = (GLushort)((x + 1) * (_gridSize.height + 1) + (y + 1));
            GLushort d = (GLushort)(x * (_gridSize.height + 1) + (y + 1));

            GLushort tempidx[6] = {a, b, d, b, c, d};

            memcpy(&idxArray[6*idx], tempidx, 6*sizeof(GLushort));

            int l1[4] = {a*3, b*3, c*3, d*3};
            Vec3 e(x1, y1, 0);
            Vec3 f(x2, y1, 0);
            Vec3 g(x2, y2, 0);
            Vec3 h(x1, y2, 0);

            Vec3 l2[4] = {e, f, g, h};

            int tex1[4] = {a*2, b*2, c*2, d*2};
            Vec2 Tex2F[4] = {Vec2(x1, y1), Vec2(x2, y1), Vec2(x2, y2), Vec2(x1, y2)};

            for (i = 0; i < 4; ++i)
            {
                vertArray[l1[i]] = l2[i].x;
                vertArray[l1[i] + 1] = l2[i].y;
                vertArray[l1[i] + 2] = l2[i].z;

                texArray[tex1[i]] = Tex2F[i].x / width;
                if (_isTextureFlipped)
                {
                    texArray[tex1[i] + 1] = (imageH - Tex2F[i].y) / height;
                }
                else
                {
                    texArray[tex1[i] + 1] = Tex2F[i].y / height;
                }
            }
        }
    }

    memcpy(_originalVertices, _vertices, (_gridSize.width+1) * (_gridSize.height+1) * sizeof(Vec3));
}

Vec3 Grid3D::getVertex(const Vec2& pos) const
{
    CCASSERT( pos.x == (unsigned int)pos.x && pos.y == (unsigned int) pos.y , "Numbers must be integers");
    
    int index = (pos.x * (_gridSize.height+1) + pos.y) * 3;
    float *vertArray = (float*)_vertices;

    Vec3 vert(vertArray[index], vertArray[index+1], vertArray[index+2]);

    return vert;
}

Vec3 Grid3D::getOriginalVertex(const Vec2& pos) const
{
    CCASSERT( pos.x == (unsigned int)pos.x && pos.y == (unsigned int) pos.y , "Numbers must be integers");
    
    int index = (pos.x * (_gridSize.height+1) + pos.y) * 3;
    float *vertArray = (float*)_originalVertices;

    Vec3 vert(vertArray[index], vertArray[index+1], vertArray[index+2]);

    return vert;
}

void Grid3D::setVertex(const Vec2& pos, const Vec3& vertex)
{
    CCASSERT( pos.x == (unsigned int)pos.x && pos.y == (unsigned int) pos.y , "Numbers must be integers");
    int index = (pos.x * (_gridSize.height + 1) + pos.y) * 3;
    float *vertArray = (float*)_vertices;
    vertArray[index] = vertex.x;
    vertArray[index+1] = vertex.y;
    vertArray[index+2] = vertex.z;
}

void Grid3D::reuse(void)
{
    if (_reuseGrid > 0)
    {
        memcpy(_originalVertices, _vertices, (_gridSize.width+1) * (_gridSize.height+1) * sizeof(Vec3));
        --_reuseGrid;
    }
}

// implementation of TiledGrid3D

TiledGrid3D::TiledGrid3D()
    : _texCoordinates(nullptr)
    , _vertices(nullptr)
    , _originalVertices(nullptr)
    , _indices(nullptr)
{

}

TiledGrid3D::~TiledGrid3D(void)
{
    CC_SAFE_FREE(_texCoordinates);
    CC_SAFE_FREE(_vertices);
    CC_SAFE_FREE(_originalVertices);
    CC_SAFE_FREE(_indices);
}

TiledGrid3D* TiledGrid3D::create(const Size& gridSize)
{
    TiledGrid3D *ret= new (std::nothrow) TiledGrid3D();

    if (ret)
    {
        if (ret->initWithSize(gridSize))
        {
            ret->autorelease();
        }
        else
        {
            delete ret;
            ret = nullptr;
        }
    }

    return ret;
}

TiledGrid3D* TiledGrid3D::create(const Size& gridSize, const Rect& rect)
{
    TiledGrid3D *ret= new (std::nothrow) TiledGrid3D();
    
    if (ret)
    {
        if (ret->initWithSize(gridSize, rect))
        {
            ret->autorelease();
        }
        else
        {
            delete ret;
            ret = nullptr;
        }
    }
    
    return ret;
}

TiledGrid3D* TiledGrid3D::create(const Size& gridSize, Texture2D *texture, bool flipped, const Rect& rect)
{
    TiledGrid3D *ret= new (std::nothrow) TiledGrid3D();
    
    if (ret)
    {
        if (ret->initWithSize(gridSize, texture, flipped, rect))
        {
            ret->autorelease();
        }
        else
        {
            delete ret;
            ret = nullptr;
        }
    }
    
    return ret;
}

TiledGrid3D* TiledGrid3D::create(const Size& gridSize, Texture2D *texture, bool flipped)
{
    TiledGrid3D *ret= new (std::nothrow) TiledGrid3D();
    
    if (ret)
    {
        if (ret->initWithSize(gridSize, texture, flipped))
        {
            ret->autorelease();
        }
        else
        {
            delete ret;
            ret = nullptr;
        }
    }
    
    return ret;
}

void TiledGrid3D::blit(void)
{
    int n = _gridSize.width * _gridSize.height;

    
    _shaderProgram->use();
    _shaderProgram->setUniformsForBuiltins();

    //
    // Attributes
    //
    GL::enableVertexAttribs( GL::VERTEX_ATTRIB_FLAG_POSITION | GL::VERTEX_ATTRIB_FLAG_TEX_COORD );

    // position
    glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_POSITION, 3, GL_FLOAT, GL_FALSE, 0, _vertices);

    // texCoords
    glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_TEX_COORD, 2, GL_FLOAT, GL_FALSE, 0, _texCoordinates);

    glDrawElements(GL_TRIANGLES, (GLsizei)n*6, GL_UNSIGNED_SHORT, _indices);

    CC_INCREMENT_GL_DRAWN_BATCHES_AND_VERTICES(1,n*6);
}

void TiledGrid3D::calculateVertexPoints(void)
{
    float width = (float)_texture->getPixelsWide();
    float height = (float)_texture->getPixelsHigh();
    float imageH = _texture->getContentSizeInPixels().height;
    
    int numQuads = _gridSize.width * _gridSize.height;
    CC_SAFE_FREE(_vertices);
    CC_SAFE_FREE(_originalVertices);
    CC_SAFE_FREE(_texCoordinates);
    CC_SAFE_FREE(_indices);

    _vertices = malloc(numQuads*4*sizeof(Vec3));
    _originalVertices = malloc(numQuads*4*sizeof(Vec3));
    _texCoordinates = malloc(numQuads*4*sizeof(Vec2));
    _indices = (GLushort*)malloc(numQuads*6*sizeof(GLushort));

    GLfloat *vertArray = (GLfloat*)_vertices;
    GLfloat *texArray = (GLfloat*)_texCoordinates;
    GLushort *idxArray = _indices;
    
    int x, y;
    
    for( x = 0; x < _gridSize.width; x++ )
    {
        for( y = 0; y < _gridSize.height; y++ )
        {
            float x1 = x * _step.x + _gridRect.origin.x;
            float x2 = x1 + _step.x;
            float y1 = y * _step.y + _gridRect.origin.y;
            float y2 = y1 + _step.y;
            
            *vertArray++ = x1;
            *vertArray++ = y1;
            *vertArray++ = 0;
            *vertArray++ = x2;
            *vertArray++ = y1;
            *vertArray++ = 0;
            *vertArray++ = x1;
            *vertArray++ = y2;
            *vertArray++ = 0;
            *vertArray++ = x2;
            *vertArray++ = y2;
            *vertArray++ = 0;
            
            float newY1 = y1;
            float newY2 = y2;
            
            if (_isTextureFlipped) 
            {
                newY1 = imageH - y1;
                newY2 = imageH - y2;
            }

            *texArray++ = x1 / width;
            *texArray++ = newY1 / height;
            *texArray++ = x2 / width;
            *texArray++ = newY1 / height;
            *texArray++ = x1 / width;
            *texArray++ = newY2 / height;
            *texArray++ = x2 / width;
            *texArray++ = newY2 / height;
        }
    }
    
    for (x = 0; x < numQuads; x++)
    {
        idxArray[x*6+0] = (GLushort)(x * 4 + 0);
        idxArray[x*6+1] = (GLushort)(x * 4 + 1);
        idxArray[x*6+2] = (GLushort)(x * 4 + 2);
        
        idxArray[x*6+3] = (GLushort)(x * 4 + 1);
        idxArray[x*6+4] = (GLushort)(x * 4 + 2);
        idxArray[x*6+5] = (GLushort)(x * 4 + 3);
    }
    
    memcpy(_originalVertices, _vertices, numQuads * 12 * sizeof(GLfloat));
}

void TiledGrid3D::setTile(const Vec2& pos, const Quad3& coords)
{
    CCASSERT( pos.x == (unsigned int)pos.x && pos.y == (unsigned int) pos.y , "Numbers must be integers");
    int idx = (_gridSize.height * pos.x + pos.y) * 4 * 3;
    float *vertArray = (float*)_vertices;
    memcpy(&vertArray[idx], &coords, sizeof(Quad3));
}

Quad3 TiledGrid3D::getOriginalTile(const Vec2& pos) const
{
    CCASSERT( pos.x == (unsigned int)pos.x && pos.y == (unsigned int) pos.y , "Numbers must be integers");
    int idx = (_gridSize.height * pos.x + pos.y) * 4 * 3;
    float *vertArray = (float*)_originalVertices;

    Quad3 ret;
    memcpy(&ret, &vertArray[idx], sizeof(Quad3));

    return ret;
}

Quad3 TiledGrid3D::getTile(const Vec2& pos) const
{
    CCASSERT( pos.x == (unsigned int)pos.x && pos.y == (unsigned int) pos.y , "Numbers must be integers");
    int idx = (_gridSize.height * pos.x + pos.y) * 4 * 3;
    float *vertArray = (float*)_vertices;

    Quad3 ret;
    memcpy(&ret, &vertArray[idx], sizeof(Quad3));

    return ret;
}

void TiledGrid3D::reuse(void)
{
    if (_reuseGrid > 0)
    {
        int numQuads = _gridSize.width * _gridSize.height;

        memcpy(_originalVertices, _vertices, numQuads * 12 * sizeof(GLfloat));
        --_reuseGrid;
    }
}

NS_CC_END