#include "cbt/opengl/buffer.hpp"

#include "glad/glad.h"

namespace cbt::opengl {

buffer::buffer() {
    glGenBuffers(1, &m_id);
}

buffer::buffer(buffer_type type)
    : m_type(type) {
    glGenBuffers(1, &m_id);
}

buffer::~buffer() {
    if (m_id) {
        glDeleteBuffers(1, &m_id);
    }
}

buffer::buffer(buffer&& other) noexcept
    : m_id(other.m_id)
    , m_type(other.m_type) {
    other.m_id = 0;
}

buffer& buffer::operator=(buffer&& other) noexcept {
    if (this != &other) {
        if (m_id) {
            glDeleteBuffers(1, &m_id);
        }
        m_id = other.m_id;
        m_type = other.m_type;
        other.m_id = 0;
    }
    return *this;
}

auto buffer::bind() const -> void {
    glBindBuffer(static_cast<GLenum>(m_type), m_id);
}

auto buffer::unbind() const -> void {
    glBindBuffer(static_cast<GLenum>(m_type), 0);
}

auto buffer::upload(void const* data, size_t size) -> void {
    bind();
    glBufferData(static_cast<GLenum>(m_type), size, data, GL_STATIC_DRAW);
    unbind();
}

auto buffer::upload(std::vector<uint8_t> data) -> void {
    upload(data.data(), data.size());
}

auto buffer::upload_dynamic(void const* data, size_t size) -> void {
    bind();
    glBufferData(static_cast<GLenum>(m_type), size, data, GL_DYNAMIC_DRAW);
    unbind();
}

auto buffer::id() const -> GLuint {
    return m_id;
}

auto buffer::valid() const -> bool {
    return m_id != 0;
}

}