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

namespace XCEngine {
namespace RHI {

OpenGLCommandList::OpenGLCommandList() 
    : m_primitiveType(GL_TRIANGLES)
    , m_currentVAO(0)
    , m_currentProgram(0)
{
}

OpenGLCommandList::~OpenGLCommandList() {
}

void OpenGLCommandList::Clear(float r, float g, float b, float a, unsigned int buffers) {
    glClearColor(r, g, b, a);
    unsigned int glBuffers = 0;
    if (buffers & 0x1) glBuffers |= GL_COLOR_BUFFER_BIT;
    if (buffers & 0x2) glBuffers |= GL_DEPTH_BUFFER_BIT;
    if (buffers & 0x4) glBuffers |= GL_STENCIL_BUFFER_BIT;
    glClear(glBuffers);
}

void OpenGLCommandList::SetPipelineState(void* pipelineState) {
}

void OpenGLCommandList::SetVertexBuffer(unsigned int buffer, size_t offset, size_t stride) {
}

void OpenGLCommandList::SetIndexBuffer(unsigned int buffer, unsigned int type) {
}

static unsigned int ToGLPrimitiveType(PrimitiveType type) {
    switch (type) {
        case PrimitiveType::Points: return GL_POINTS;
        case PrimitiveType::Lines: return GL_LINES;
        case PrimitiveType::LineStrip: return GL_LINE_STRIP;
        case PrimitiveType::Triangles: return GL_TRIANGLES;
        case PrimitiveType::TriangleStrip: return GL_TRIANGLE_STRIP;
        case PrimitiveType::TriangleFan: return GL_TRIANGLE_FAN;
        default: return GL_TRIANGLES;
    }
}

void OpenGLCommandList::Draw(PrimitiveType type, unsigned int vertexCount, unsigned int startVertex) {
    m_primitiveType = ToGLPrimitiveType(type);
    glDrawArrays(m_primitiveType, startVertex, vertexCount);
}

void OpenGLCommandList::DrawIndexed(PrimitiveType type, unsigned int indexCount, unsigned int startIndex, int baseVertex) {
    m_primitiveType = ToGLPrimitiveType(type);
    glDrawElements(m_primitiveType, indexCount, GL_UNSIGNED_INT, (void*)(startIndex * sizeof(unsigned int)));
}

void OpenGLCommandList::BindVertexArray(unsigned int vao) {
    m_currentVAO = vao;
    glBindVertexArray(vao);
}

void OpenGLCommandList::UseShader(unsigned int program) {
    m_currentProgram = program;
    glUseProgram(program);
}

void OpenGLCommandList::SetViewport(int x, int y, int width, int height) {
    glViewport(x, y, width, height);
}

} // namespace RHI
} // namespace XCEngine