#pragma once

#include "opengl/handles/mesh_handle.hpp"
#include "util/uix.hpp"

#include <system_error>
#include <span>

#include "assets/components/mesh_vertex_components.hpp"
#include "GL/glew.h"

namespace zgl
{
struct mesh_data
{
private:
	mesh_data(
		GLuint vertex_vbo_id,
		GLuint index_vbo_id,
		GLuint vao_id,
		ztu::u32 material_id,
		mesh_vertex_components::flags components,
		GLsizei index_count
	);

public:
	mesh_data() = default;

	[[nodiscard]] static std::error_code build_from(
		std::span<const std::uint8_t> vertex_buffer,
		std::span<const GLenum> component_types,
		std::span<const GLint> component_lengths,
		GLsizei stride,
		std::span<const ztu::u32> index_buffer,
		ztu::u32 material_id,
		mesh_vertex_components::flags components,
		mesh_data& data
	);

	mesh_data(const mesh_data& other) = delete;
	mesh_data& operator=(const mesh_data& other) = delete;

	mesh_data(mesh_data&& other) noexcept;
	mesh_data& operator=(mesh_data&& other) noexcept;

	~mesh_data();

	[[nodiscard]] mesh_handle handle() const;

	[[nodiscard]] mesh_vertex_components::flags components() const;

	[[nodiscard]] ztu::u32 material_id() const;


private:
	mesh_handle m_handle{};
	GLuint m_vertex_vbo_id{ 0 };
	GLuint m_index_vbo_id{ 0 };
	ztu::u32 m_material_id{ 0 };
	mesh_vertex_components::flags m_component_types{
		mesh_vertex_components::flags::none
	};
};
}

#define INCLUDE_MESH_DATA_IMPLEMENTATION
#include "opengl/data/mesh_data.ipp"
#undef INCLUDE_MESH_DATA_IMPLEMENTATION