#define GLFW_INCLUDE_NONE
#include "XCEngine/RHI/OpenGL/OpenGLDevice.h"
#include <glad/glad.h>
#include <GLFW/glfw3.h>

namespace XCEngine {
namespace RHI {

OpenGLDevice::OpenGLDevice()
    : m_window(nullptr)
    , m_initialized(false)
    , m_ownsWindow(false) {
}

OpenGLDevice::~OpenGLDevice() {
    Shutdown();
}

bool OpenGLDevice::Initialize(const RHIDeviceDesc& desc) {
    if (m_initialized) {
        return true;
    }

    if (desc.windowHandle) {
        return InitializeWithExistingWindow(static_cast<GLFWwindow*>(desc.windowHandle));
    }

    std::string titleStr = "XCEngine";
    if (!desc.appName.empty()) {
        titleStr = std::string(desc.appName.begin(), desc.appName.end());
    }
    
    return CreateRenderWindow(desc.width, desc.height, titleStr.c_str(), desc.enableDebugLayer);
}

bool OpenGLDevice::CreateRenderWindow(int width, int height, const char* title, bool enableDebug) {
    if (m_initialized) {
        return true;
    }

    static bool glfwInitialized = false;
    if (!glfwInitialized) {
        glfwInit();
        glfwInitialized = true;
    }

    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);

    m_window = glfwCreateWindow(width, height, title, nullptr, nullptr);
    if (!m_window) {
        return false;
    }

    glfwSetWindowShouldClose(m_window, GLFW_FALSE);

    m_ownsWindow = true;
    return InitializeWithExistingWindow(m_window);
}

bool OpenGLDevice::InitializeWithExistingWindow(GLFWwindow* window) {
    if (m_initialized) {
        return true;
    }

    m_window = window;
    if (!m_window) {
        return false;
    }

    glfwMakeContextCurrent(m_window);

    if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress)) {
        return false;
    }

    const char* vendor = reinterpret_cast<const char*>(glGetString(GL_VENDOR));
    const char* renderer = reinterpret_cast<const char*>(glGetString(GL_RENDERER));
    const char* version = reinterpret_cast<const char*>(glGetString(GL_VERSION));
    
    m_deviceInfo.vendor = std::wstring(vendor ? vendor : "", vendor ? vendor + strlen(vendor) : nullptr);
    m_deviceInfo.renderer = std::wstring(renderer ? renderer : "", renderer ? renderer + strlen(renderer) : nullptr);
    m_deviceInfo.version = std::wstring(version ? version : "", version ? version + strlen(version) : nullptr);
    
    m_initialized = true;
    return true;
}

void OpenGLDevice::Shutdown() {
    if (m_ownsWindow && m_window) {
        glfwDestroyWindow(m_window);
    }
    m_window = nullptr;
    m_initialized = false;
    m_ownsWindow = false;
}

void OpenGLDevice::SwapBuffers() {
    if (m_window) {
        glfwSwapBuffers(m_window);
    }
}

bool OpenGLDevice::PollEvents() {
    glfwPollEvents();
    return !glfwWindowShouldClose(m_window);
}

void OpenGLDevice::SetShouldClose(bool shouldClose) {
    if (m_window) {
        glfwSetWindowShouldClose(m_window, shouldClose ? GLFW_TRUE : GLFW_FALSE);
    }
}

bool OpenGLDevice::ShouldClose() const {
    return m_window && glfwWindowShouldClose(m_window) == GLFW_TRUE;
}

RHIBuffer* OpenGLDevice::CreateBuffer(const BufferDesc& desc) {
    return nullptr;
}

RHITexture* OpenGLDevice::CreateTexture(const TextureDesc& desc) {
    return nullptr;
}

RHISwapChain* OpenGLDevice::CreateSwapChain(const SwapChainDesc& desc) {
    return nullptr;
}

RHICommandList* OpenGLDevice::CreateCommandList(const CommandListDesc& desc) {
    return nullptr;
}

RHICommandQueue* OpenGLDevice::CreateCommandQueue(const CommandQueueDesc& desc) {
    return nullptr;
}

RHIShader* OpenGLDevice::CompileShader(const ShaderCompileDesc& desc) {
    return nullptr;
}

RHIPipelineState* OpenGLDevice::CreatePipelineState(const PipelineStateDesc& desc) {
    return nullptr;
}

RHIFence* OpenGLDevice::CreateFence(const FenceDesc& desc) {
    return nullptr;
}

RHISampler* OpenGLDevice::CreateSampler(const SamplerDesc& desc) {
    return nullptr;
}

const RHICapabilities& OpenGLDevice::GetCapabilities() const {
    return m_capabilities;
}

const RHIDeviceInfo& OpenGLDevice::GetDeviceInfo() const {
    return m_deviceInfo;
}

void* OpenGLDevice::GetNativeDevice() {
    return nullptr;
}

void* OpenGLDevice::GetNativeHandle() const {
    return nullptr;
}

} // namespace RHI
} // namespace XCEngine