chess_player.h

#ifndef _CHESS_PLAYER_H_
#define _CHESS_PLAYER_H_

#include <random>
#include <vector>

#include "chess_board.h"

using std::vector;

class Player {
public:
	const Team team;

	Player(Team team) : team(team) {}

	virtual Move get_move(const Board& board, const vector<Move>& moves) const = 0;
	virtual const char* name() const;
};

class RandomPlayer : public Player {
	mutable std::default_random_engine random_number_generator;
public:
	RandomPlayer(Team team);

	Move get_move(const Board& board, const vector<Move>& moves) const override;
};

class HumanPlayer : public Player {
public:
	HumanPlayer(Team team);
	Move get_move(const Board& board, const vector<Move>& moves) const override;
};

class AIPlayer : public Player {
	mutable std::default_random_engine random_number_generator;
	bool good_move(const Move move, const Board& board) const;
	bool is_more_value(const ChessPiece& p1, const ChessPiece& p2) const;
	int minimax(const Board& b, Move move, int depth, int alpha, int beta, bool white) const;
	int value(const ChessPiece& p) const;
public:
	AIPlayer(Team team);
	int eval(const Board& b) const;
	Move get_move(const Board& board, const vector<Move>& moves) const override;
};

// CapturePlayer plays a random move that captures an opponents piece.
// If there is no such move, then it plays a random move.
class CapturePlayer : public Player {
	mutable std::default_random_engine random_number_generator;
public:
	CapturePlayer(Team team);
	Move get_move(const Board& board, const vector<Move>& moves) const override;
};

class CheckMateCapturePlayer : public Player {
	mutable std::default_random_engine random_number_generator;
public:
	CheckMateCapturePlayer(Team team);
	Move get_move(const Board& board, const vector<Move>& moves) const override;
};

#endif  // _CHESS_PLAYER_H_#pragma once