#pragma once
#include "Utils.hpp"
#include "Reporter.hpp"
#include <yycc.hpp>
#include <yycc/macro/class_copy_move.hpp>
#include <string>
#include <optional>
#include <expected>

namespace BMapInspector::Cli {

	enum class RequestKind {
		Help,
		Version,
		Work,
	};

	class Request {
	public:
		static Request FromHelpRequest();
		static Request FromVersionRequest();
		static Request FromWorkRequest(Utils::ReportLevel level,
		                               const std::u8string_view& file_path,
		                               const std::u8string_view& encoding,
		                               const std::u8string_view& ballance_path);

	private:
		Request(RequestKind kind,
		        std::optional<Utils::ReportLevel> level,
		        std::optional<std::u8string_view> file_path,
		        std::optional<std::u8string_view> encoding,
		        std::optional<std::u8string_view> ballance_path);

	public:
		~Request();
		YYCC_DEFAULT_COPY_MOVE(Request)

	public:
		RequestKind GetRequestKind() const;
		Utils::ReportLevel GetLevel() const;
		std::u8string_view GetFilePath() const;
		std::u8string_view GetEncoding() const;
		std::u8string_view GetBallancePath() const;

	private:
		RequestKind kind;                           ///< The kind of this request.
		std::optional<Utils::ReportLevel> level;    ///< The filter level.
		std::optional<std::u8string> file_path;     ///< The path to loaded map file.
		std::optional<std::u8string> encoding;      ///< The encoding used when loading map file.
		std::optional<std::u8string> ballance_path; ///< The path to Ballance root directory for loading resources.
	};

	enum class Error {
		BadParse, ///< Error occurs when executing parser.
		NoFile, ///< User do not specify file path for loading.
		BadFile, ///< User specified file path is bad.
		NoBallance, ///< User do not specify Ballance directory for loading.
		BadBallance, ///< User specified Ballance directory is bad.
		BadEncoding, ///< User given encoding value is bad.
		BadLevel, ///< User given level name is bad.
	};

	template<typename T>
	using Result = std::expected<T, Error>;

	Result<Request> parse();

} // namespace BMapInspector::Cli