/*
    This file is part of Cute Chess.
    Copyright (C) 2008-2018 Cute Chess authors

    Cute Chess is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    Cute Chess is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with Cute Chess.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef XBOARDENGINE_H
#define XBOARDENGINE_H

#include "chessengine.h"
#include "board/board.h"

using XboardFeature = std::pair<QString, QString>;

/*!
 * \brief A chess engine which uses the Xboard chess engine communication protocol.
 *
 * Xboard's specifications: http://www.open-aurec.com/wbforum/WinBoard/engine-intf.html
 */
class LIB_EXPORT XboardEngine : public ChessEngine
{
	Q_OBJECT

	public:
		/*! Creates a new XboardEngine. */
		XboardEngine(QObject* parent = nullptr);

		// Inherited from ChessEngine
		virtual void endGame(const Chess::Result& result);
		virtual void makeMove(const Chess::Move& move);
		virtual QString protocol() const;

	protected:
		// Inherited from ChessEngine
		virtual void applyConfiguration(const EngineConfiguration& configuration);
		virtual bool sendPing();
		virtual void sendStop();
		virtual void sendQuit();
		virtual void startProtocol();
		virtual void startGame();
		virtual void startThinking();
		virtual void parseLine(const QString& line);
		virtual void sendOption(const QString& name, const QVariant& value);
		virtual bool restartsBetweenGames() const;

		/*! Parses a feature string from the engine. */
		QList<XboardFeature> parseFeatures(QStringView featureArgs);

		/*! Parses a principal valuation string from the engine. */
		MoveEvaluation parsePv(QStringView pvString);

		/*! Parses an option string from the engine. */
		EngineOption* parseOption(const QString& line);

	protected slots:
		// Inherited from ChessEngine
		virtual void onTimeout();

		/*! Initializes the engine, and emits the 'ready' signal. */
		void initialize();

	private:
		void setFeature(const QString& name, const QString& val);
		void setForceMode(bool enable);
		void sendTimeLeft();
		void finishGame();
		QString moveString(const Chess::Move& move);
		int adaptScore(int score) const;
		const QString transformMove(const QString& str, int height, int shift) const;
		
		bool m_forceMode;
		bool m_drawOnNextMove;
		
		// Engine features
		bool m_ftName;
		bool m_ftPing;
		bool m_ftSetboard;
		bool m_ftTime;
		bool m_ftUsermove;
		bool m_ftReuse;
		bool m_ftNps;
		
		bool m_gotResult;
		int m_lastPing;
		Chess::Move m_nextMove;
		QString m_nextMoveString;
		Chess::Board::MoveNotation m_notation;
		QTimer* m_initTimer;
};

#endif // XBOARDENGINE_H
