#pragma once

#include <filesystem>
#include <system_error>

#include "assets/dynamic_data_store.hpp"
#include "assets/prefetch_lookup.hpp"
#include "assets/prefetch_queue.hpp"
#include "assets/dynamic_read_buffers/dynamic_material_buffer.hpp"
#include "assets/dynamic_data_stores/dynamic_material_library_store.hpp"
#include "assets/dynamic_data_stores/dynamic_material_store.hpp"
#include "util/string_lookup.hpp"
#include "util/result.hpp"

namespace mtl_loader_error
{
enum class codes {
	ok = 0,
	cannot_open_file,
	cannot_open_texture,
	malformed_ambient_color,
	malformed_diffuse_color,
	malformed_specular_color,
	malformed_specular_exponent,
	malformed_dissolve,
	unknown_line_begin
};
} // namespace mtl_loader_error

struct mtl_loader
{
	static constexpr auto name = std::string_view("mtl");

	[[nodiscard]] static std::error_code prefetch(
		const file_dir_list& paths,
		prefetch_queue& queue
	);

	// THis is not very elegant, but right now I do not see a better solution...
	[[nodiscard]] static std::error_code load(
		dynamic_material_library_buffer& material_library_buffer,
		const file_dir_list& paths,
		prefetch_lookup& id_lookup,
		dynamic_data_store& store,
		bool pedantic = false
	);

protected:
	static void find_textures(
		std::span<char> buffer,
		std::filesystem::path& path_buffer,
		const std::filesystem::path& base_directory,
		std::ifstream& in,
		ztu::string_list& texture_filenames
	);
};