#include <module/module_registry.h>
#include <platform/window_module.h>
#include <renderer/rhi_module.h>
#include <utils/logger.h>

// 包含 OpenGL 设备实现
// 注意：GLDevice 定义在 gl_device.cpp 中，需要确保链接时包含
namespace extra2d {
// 前向声明 GLDevice 类
class GLDevice;
} // namespace extra2d

namespace extra2d {

// 全局实例指针
static RHIModule *g_rhiModule = nullptr;

// GLDevice 创建函数声明 - 在 gl_device.cpp 中定义
std::unique_ptr<RHIDevice> CreateGLDevice();

RHIModule::RHIModule() : context_(nullptr) { g_rhiModule = this; }

RHIModule::~RHIModule() {
  shutdown();
  g_rhiModule = nullptr;
}

bool RHIModule::init() {
  E2D_INFO("正在初始化 RHI 模块...");

  // 注册窗口显示事件监听，在窗口显示时创建 OpenGL 上下文
  onShowListener_ = std::make_unique<events::OnShow::Listener>();
  onShowListener_->bind([this]() { this->onWindowShow(); });

  E2D_INFO("RHI 模块已初始化 (等待窗口显示)");
  return true;
}

void RHIModule::onWindowShow() {
  if (initialized_) {
    return;
  }

  E2D_INFO("RHI 模块: 正在创建 OpenGL 设备...");

  // 获取窗口模块
  auto *windowModule = getModule<WindowModule>();
  if (!windowModule) {
    E2D_ERROR("窗口模块不可用");
    return;
  }

  // 等待窗口创建完成
  if (!windowModule->handle()) {
    E2D_ERROR("窗口尚未创建");
    return;
  }

  // 创建 OpenGL 设备并传入窗口句柄
  device_ = CreateGLDevice();
  if (!device_) {
    E2D_ERROR("创建 RHI 设备失败");
    return;
  }

  if (!device_->initialize(windowModule->handle())) {
    E2D_ERROR("初始化 RHI 设备失败");
    device_.reset();
    return;
  }

  context_ = device_->getContext();
  if (!context_) {
    E2D_ERROR("获取 RHI 上下文失败");
    device_->shutdown();
    device_.reset();
    return;
  }
  // 注意：context 已在 GLDevice::initialize() 中初始化，这里不需要再次初始化

  initialized_ = true;
  E2D_INFO("RHI模块 初始化成功 (后端：{})", device_->getBackendName());

  // RHI 初始化完成，再次触发 OnShow 事件通知其他模块
  // 这样 RendererModule 等依赖 RHI 的模块可以完成初始化
  events::OnShow::emit();
}

void RHIModule::shutdown() {
  E2D_INFO("正在关闭 RHI模块...");

  // 清理事件监听器
  onShowListener_.reset();

  if (context_) {
    context_->shutdown();
    context_ = nullptr;
  }

  if (device_) {
    device_->shutdown();
    device_.reset();
  }

  initialized_ = false;

  E2D_INFO("RHI模块 关闭完成");
}

RHIModule *RHIModule::get() { return g_rhiModule; }

std::unique_ptr<RHIBuffer> RHIModule::createBuffer(const BufferDesc &desc) {
  if (!device_) {
    E2D_ERROR("无法创建缓冲区：RHI 设备未初始化");
    return nullptr;
  }
  return device_->createBuffer(desc);
}

std::unique_ptr<RHITexture> RHIModule::createTexture(const TextureDesc &desc) {
  if (!device_) {
    E2D_ERROR("无法创建纹理: RHI 设备未初始化");
    return nullptr;
  }
  return device_->createTexture(desc);
}

std::unique_ptr<RHIShader> RHIModule::createShader(const ShaderDesc &desc) {
  if (!device_) {
    E2D_ERROR("无法创建着色器: RHI 设备未初始化");
    return nullptr;
  }
  return device_->createShader(desc);
}

std::unique_ptr<RHIPipeline>
RHIModule::createPipeline(const PipelineDesc &desc) {
  if (!device_) {
    E2D_ERROR("无法创建管线: RHI 设备未初始化");
    return nullptr;
  }
  return device_->createPipeline(desc);
}

std::unique_ptr<RHIFramebuffer>
RHIModule::createFramebuffer(const RenderPassDesc &desc) {
  if (!device_) {
    E2D_ERROR("无法创建帧缓冲区: RHI 设备未初始化");
    return nullptr;
  }
  return device_->createFramebuffer(desc);
}

std::unique_ptr<RHICommandList> RHIModule::createCommandList() {
  if (!device_) {
    E2D_ERROR("无法创建命令列表: RHI 设备未初始化");
    return nullptr;
  }
  return device_->createCommandList();
}

// BufferDesc 静态方法实现
BufferDesc BufferDesc::vertex(uint32_t size, BufferUsage usage) {
  BufferDesc desc;
  desc.type = BufferType::Vertex;
  desc.usage = usage;
  desc.size = size;
  return desc;
}

BufferDesc BufferDesc::index(uint32_t size, BufferUsage usage) {
  BufferDesc desc;
  desc.type = BufferType::Index;
  desc.usage = usage;
  desc.size = size;
  return desc;
}

BufferDesc BufferDesc::uniform(uint32_t size) {
  BufferDesc desc;
  desc.type = BufferType::Uniform;
  desc.usage = BufferUsage::Dynamic;
  desc.size = size;
  return desc;
}

// BlendState 静态方法实现
BlendState BlendState::opaque() {
  BlendState state;
  state.enabled = false;
  state.srcFactor = BlendFactor::One;
  state.dstFactor = BlendFactor::Zero;
  state.op = BlendOp::Add;
  state.srcAlphaFactor = BlendFactor::One;
  state.dstAlphaFactor = BlendFactor::Zero;
  state.alphaOp = BlendOp::Add;
  return state;
}

BlendState BlendState::alphaBlend() {
  BlendState state;
  state.enabled = true;
  state.srcFactor = BlendFactor::SrcAlpha;
  state.dstFactor = BlendFactor::OneMinusSrcAlpha;
  state.op = BlendOp::Add;
  state.srcAlphaFactor = BlendFactor::One;
  state.dstAlphaFactor = BlendFactor::OneMinusSrcAlpha;
  state.alphaOp = BlendOp::Add;
  return state;
}

BlendState BlendState::additive() {
  BlendState state;
  state.enabled = true;
  state.srcFactor = BlendFactor::SrcAlpha;
  state.dstFactor = BlendFactor::One;
  state.op = BlendOp::Add;
  state.srcAlphaFactor = BlendFactor::SrcAlpha;
  state.dstAlphaFactor = BlendFactor::One;
  state.alphaOp = BlendOp::Add;
  return state;
}

// DepthStencilState 静态方法实现
DepthStencilState DepthStencilState::depthTest() {
  DepthStencilState state;
  state.depthTestEnabled = true;
  state.depthWriteEnabled = true;
  state.depthCompare = CompareFunc::Less;
  state.stencilEnabled = false;
  return state;
}

DepthStencilState DepthStencilState::depthTestWrite() {
  DepthStencilState state;
  state.depthTestEnabled = true;
  state.depthWriteEnabled = true;
  state.depthCompare = CompareFunc::Less;
  state.stencilEnabled = false;
  return state;
}

DepthStencilState DepthStencilState::depthTestNoWrite() {
  DepthStencilState state;
  state.depthTestEnabled = true;
  state.depthWriteEnabled = false;
  state.depthCompare = CompareFunc::Less;
  state.stencilEnabled = false;
  return state;
}

DepthStencilState DepthStencilState::noDepthTest() {
  DepthStencilState state;
  state.depthTestEnabled = false;
  state.depthWriteEnabled = false;
  state.depthCompare = CompareFunc::Always;
  state.stencilEnabled = false;
  return state;
}

// RasterizerState 静态方法实现
RasterizerState RasterizerState::cullBack() {
  RasterizerState state;
  state.cullEnabled = true;
  state.cullFrontFace = false;
  state.frontCCW = false;
  state.scissorEnabled = false;
  state.wireframe = false;
  return state;
}

RasterizerState RasterizerState::cullFront() {
  RasterizerState state;
  state.cullEnabled = true;
  state.cullFrontFace = true;
  state.frontCCW = false;
  state.scissorEnabled = false;
  state.wireframe = false;
  return state;
}

RasterizerState RasterizerState::noCull() {
  RasterizerState state;
  state.cullEnabled = false;
  state.cullFrontFace = false;
  state.frontCCW = false;
  state.scissorEnabled = false;
  state.wireframe = false;
  return state;
}

// VertexLayout 方法实现
void VertexLayout::addAttribute(uint32_t location, VertexFormat format,
                                uint32_t offset, uint32_t bufferIndex) {
  VertexAttribute attr;
  attr.location = location;
  attr.format = format;
  attr.offset = offset;
  attr.bufferIndex = bufferIndex;
  attributes.push_back(attr);
}

// VertexAttribute 方法实现
uint32_t VertexAttribute::getSize(VertexFormat format) {
  switch (format) {
  case VertexFormat::Float1:
    return 4;
  case VertexFormat::Float2:
    return 8;
  case VertexFormat::Float3:
    return 12;
  case VertexFormat::Float4:
    return 16;
  case VertexFormat::Int1:
    return 4;
  case VertexFormat::Int2:
    return 8;
  case VertexFormat::Int3:
    return 12;
  case VertexFormat::Int4:
    return 16;
  case VertexFormat::UInt1:
    return 4;
  case VertexFormat::UInt2:
    return 8;
  case VertexFormat::UInt3:
    return 12;
  case VertexFormat::UInt4:
    return 16;
  case VertexFormat::Byte4:
    return 4;
  case VertexFormat::Byte4Normalized:
    return 4;
  case VertexFormat::UByte4:
    return 4;
  case VertexFormat::UByte4Normalized:
    return 4;
  default:
    return 0;
  }
}

} // namespace extra2d