#define GLFW_INCLUDE_NONE
#include "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::CreateWindow(int width, int height, const char* title, bool enableDebug) {
    if (m_initialized) {
        return 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;
    }

    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;
    }

    m_deviceInfo.vendor = reinterpret_cast<const char*>(glGetString(GL_VENDOR));
    m_deviceInfo.renderer = reinterpret_cast<const char*>(glGetString(GL_RENDERER));
    m_deviceInfo.version = reinterpret_cast<const char*>(glGetString(GL_VERSION));
    
    glGetIntegerv(GL_MAJOR_VERSION, &m_deviceInfo.majorVersion);
    glGetIntegerv(GL_MINOR_VERSION, &m_deviceInfo.minorVersion);

    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;
}

} // namespace RHI
} // namespace XCEngine