#pragma once

#include "../Texture.h"
#include "platform/CCGL.h"
#include "base/CCEventListenerCustom.h"

CC_BACKEND_BEGIN

struct TextureInfoGL
{
    void applySamplerDescriptor(const SamplerDescriptor &desc, bool isPow2, bool hasMipmaps);

    GLint magFilterGL = GL_LINEAR;
    GLint minFilterGL = GL_LINEAR;
    GLint sAddressModeGL = GL_REPEAT;
    GLint tAddressModeGL = GL_REPEAT;

    // Used in glTexImage2D().
    GLint internalFormat = GL_RGBA;
    GLenum format = GL_RGBA;
    GLenum type = GL_UNSIGNED_BYTE;

    GLuint texture = 0;
};

class Texture2DGL : public backend::Texture2D
{
public:
    Texture2DGL(const TextureDescriptor& descriptor);
    ~Texture2DGL();
    
    virtual void updateData(uint8_t* data, uint32_t width , uint32_t height, uint32_t level) override;
    virtual void updateCompressedData(uint8_t* data, uint32_t width , uint32_t height, uint32_t dataLen, uint32_t level) override;
    virtual void updateSubData(uint32_t xoffset, uint32_t yoffset, uint32_t width, uint32_t height, uint32_t level, uint8_t* data) override;
    virtual void updateCompressedSubData(uint32_t xoffset, uint32_t yoffset, uint32_t width, uint32_t height, uint32_t dataLen, uint32_t level, uint8_t* data) override;
    virtual void updateSamplerDescriptor(const SamplerDescriptor &sampler)  override;
    virtual void getBytes(int x, int y, int width, int height, bool flipImage, std::function<void(const unsigned char*, int, int)> callback) override;
    virtual void generateMipmaps() override;
    virtual void updateTextureDescriptor(const TextureDescriptor& descriptor) override;

    inline GLuint getHandler() const { return _textureInfo.texture; }

    void apply(int index) const;

private:
    void initWithZeros();

    SamplerDescriptor _samplerDescriptor;
    TextureInfoGL _textureInfo;
    EventListener* _backToForegroundListener = nullptr;
};

class TextureCubeGL: public backend::TextureCubemap
{
public:
    TextureCubeGL(const TextureDescriptor& descriptor);
    ~TextureCubeGL();
    
    virtual void updateSamplerDescriptor(const SamplerDescriptor &sampler) override;
    virtual void updateFaceData(TextureCubeFace side, void *data) override;
    virtual void getBytes(int x, int y, int width, int height, bool flipImage, std::function<void(const unsigned char*, int, int)> callback) override;
    virtual void generateMipmaps() override;
    virtual void updateTextureDescriptor(const TextureDescriptor& descriptor) override ;

    inline GLuint getHandler() const { return _textureInfo.texture; }

    void apply(int index) const;

private:
    void setTexParameters();

    TextureInfoGL _textureInfo;
    EventListener* _backToForegroundListener = nullptr;
};

CC_BACKEND_END