#define GLFW_INCLUDE_NONE
#include "OpenGLBuffer.h"
#include <glad/glad.h>
#include <GLFW/glfw3.h>

namespace XCEngine {
namespace RHI {

OpenGLBuffer::OpenGLBuffer()
    : m_buffer(0)
    , m_size(0)
    , m_isIndexBuffer(false) {
}

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

bool OpenGLBuffer::InitializeVertexBuffer(const void* data, size_t size) {
    glGenBuffers(1, &m_buffer);
    glBindBuffer(GL_ARRAY_BUFFER, m_buffer);
    glBufferData(GL_ARRAY_BUFFER, size, data, GL_STATIC_DRAW);
    m_size = size;
    m_isIndexBuffer = false;
    return true;
}

bool OpenGLBuffer::InitializeIndexBuffer(const void* data, size_t size) {
    glGenBuffers(1, &m_buffer);
    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_buffer);
    glBufferData(GL_ELEMENT_ARRAY_BUFFER, size, data, GL_STATIC_DRAW);
    m_size = size;
    m_isIndexBuffer = true;
    return true;
}

void OpenGLBuffer::Shutdown() {
    if (m_buffer) {
        glDeleteBuffers(1, &m_buffer);
        m_buffer = 0;
    }
}

void OpenGLBuffer::Bind() const {
    if (m_isIndexBuffer) {
        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_buffer);
    } else {
        glBindBuffer(GL_ARRAY_BUFFER, m_buffer);
    }
}

void OpenGLBuffer::Unbind() const {
    if (m_isIndexBuffer) {
        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
    } else {
        glBindBuffer(GL_ARRAY_BUFFER, 0);
    }
}

} // namespace RHI
} // namespace XCEngine