#pragma once

#include <glad/glad.h>
#include <renderer/rhi/rhi.h>

namespace extra2d {

// 前向声明
class GLPipeline;
class GLBuffer;
class GLTexture;
class GLFramebuffer;

/**
 * @brief OpenGL 命令列表实现
 */
class GLCommandList : public RHICommandList {
public:
  GLCommandList();
  ~GLCommandList() override;

  //===========================================================================
  // 命令列表生命周期
  //===========================================================================

  void begin() override;
  void end() override;
  void submit() override;

  //===========================================================================
  // 渲染通道
  //===========================================================================

  void beginRenderPass(RHIFramebuffer *framebuffer,
                       ClearFlags clearFlags = ClearFlags::Color,
                       const Color &clearColor = Color::Black,
                       float clearDepth = 1.0f,
                       uint8_t clearStencil = 0) override;
  void endRenderPass() override;

  //===========================================================================
  // 状态设置
  //===========================================================================

  void setViewport(const Viewport &viewport) override;
  void setScissor(const ScissorRect &scissor) override;
  void setPipeline(RHIPipeline *pipeline) override;

  //===========================================================================
  // 资源绑定
  //===========================================================================

  void setVertexBuffer(uint32_t slot, RHIBuffer *buffer,
                       uint32_t offset = 0, uint32_t stride = 0) override;
  void setIndexBuffer(RHIBuffer *buffer, IndexType type,
                      uint32_t offset = 0) override;
  void setUniformBuffer(uint32_t slot, RHIBuffer *buffer) override;
  void setUniformBuffer(uint32_t slot, RHIBuffer *buffer, uint32_t offset, uint32_t size = 0) override;
  void setTexture(uint32_t slot, RHITexture *texture) override;
  void setSampler(uint32_t slot, TextureFilter minFilter,
                  TextureFilter magFilter, TextureWrap wrapS,
                  TextureWrap wrapT) override;

  //===========================================================================
  // 绘制命令
  //===========================================================================

  void draw(uint32_t vertexCount, uint32_t firstVertex = 0,
            uint32_t instanceCount = 1, uint32_t firstInstance = 0) override;

  void drawIndexed(uint32_t indexCount, uint32_t firstIndex = 0,
                   int32_t vertexOffset = 0, uint32_t instanceCount = 1,
                   uint32_t firstInstance = 0) override;

  //===========================================================================
  // 工具方法
  //===========================================================================

  void clear(ClearFlags flags, const Color &color = Color::Black,
             float depth = 1.0f, uint8_t stencil = 0) override;

  bool isRecording() const override;

  // 设置 uniform 变量
  void setUniform(const char* name, float value) override;
  void setUniform(const char* name, const Vec2& value) override;
  void setUniform(const char* name, const Vec3& value) override;
  void setUniform(const char* name, const Color& value) override;
  void setUniform(const char* name, const Mat4& value) override;

private:
  bool recording_ = false;
  GLPipeline *currentPipeline_ = nullptr;
  GLBuffer *currentVertexBuffer_ = nullptr;
  GLBuffer *currentIndexBuffer_ = nullptr;
  GLFramebuffer *currentFramebuffer_ = nullptr;
  GLuint currentShaderProgram_ = 0;
};

} // namespace extra2d