// GLESRenderer.h
#pragma once

#include <GLES3/gl3.h>
#include <SDL2/SDL.h>
#include <vector>
#include <map>
#include <string>

class GLESRenderer
{
public:
    GLESRenderer(SDL_Window *window);
    ~GLESRenderer();

    bool Initialize();
    void Clear();
    void Present();

    // 模拟 SDL_RenderCopy 功能
    void RenderCopy(GLuint texture, const SDL_Rect *srcrect, const SDL_Rect *dstrect);
    void RenderCopyEx(GLuint texture, const SDL_Rect *srcrect, const SDL_Rect *dstrect,
                      double angle, const SDL_Point *center, SDL_RendererFlip flip);

    // // 纹理管理
    // GLuint CreateTexture(const std::string &path);
    // GLuint CreateTextureFromSurface(SDL_Surface *surface);
    // void DestroyTexture(GLuint texture);

    // // 设置渲染状态
    // void SetDrawColor(Uint8 r, Uint8 g, Uint8 b, Uint8 a);

private:
    SDL_Window *m_window;
    SDL_GLContext m_glContext;

    // 着色器程序
    GLuint m_shaderProgram;
    GLuint m_vertexShader;
    GLuint m_fragmentShader;

    // 顶点缓冲区对象
    GLuint m_vbo;
    GLuint m_vao;

    // 批处理系统
    struct RenderCommand
    {
        GLuint texture;
        SDL_Rect dstrect;
        double angle;
        SDL_Point center;
        SDL_RendererFlip flip;
        int z_order;
    };

    std::vector<RenderCommand> m_renderBatch;

    // 编译着色器
    bool CompileShader(const char *source, GLenum type, GLuint &shader);
    bool LinkProgram(GLuint program);

    // 创建着色器程序
    bool CreateShaderProgram();

    // 设置正交投影矩阵
    void SetOrthographicProjection(int width, int height);
};