source: java/ecj/cecj/app/othello/OthelloGame.java @ 1305

package cecj.app.othello;

import games.Board;
import games.BoardGame;
import games.GameMove;
import games.Player;

import java.util.ArrayList;
import java.util.List;

public class OthelloGame implements BoardGame {

        private static final int NUM_PLAYERS = 2;

        private int currentPlayer;
        private OthelloBoard board;

        public OthelloGame(OthelloBoard board) {
                this.board = board;
        }

        public boolean endOfGame() {
                for (int row = 1; row <= OthelloBoard.size(); row++) {
                        for (int col = 1; col <= OthelloBoard.size(); col++) {
                                if (canPlace(row, col, currentPlayer)
                                                || canPlace(row, col, getOpponent(currentPlayer))) {
                                        return false;
                                }
                        }
                }
                return true;
        }

        public double evalMove(Player player, GameMove move) {
                List<Integer> directions = findDirections(move.getRow(), move.getCol(), currentPlayer);

                float result = 0;
                for (int dir : directions) {
                        int dist = 1;
                        while (board.getPiece(move.getRow(), move.getCol(), dir, dist) == getOpponent(currentPlayer)) {
                                GameMove shifted = board.getShiftedMove(move.getRow(), move.getCol(), dir, dist);
                                result += 2 * player.getValue(shifted.getRow(), shifted.getCol());
                                dist++;
                        }
                }

                return result + player.getValue(move.getRow(), move.getCol());
        }

        public List<? extends GameMove> findMoves() {
                List<OthelloMove> moves = new ArrayList<OthelloMove>();
                for (int row = 1; row <= OthelloBoard.size(); row++) {
                        for (int col = 1; col <= OthelloBoard.size(); col++) {
                                if (canPlace(row, col, currentPlayer)) {
                                        moves.add(new OthelloMove(row, col));
                                }
                        }
                }
                return moves;
        }

        public void makeMove(GameMove move) {
                List<Integer> directions = findDirections(move.getRow(), move.getCol(), currentPlayer);
                for (int dir : directions) {
                        int dist = 1;
                        board.setPiece(move.getRow(), move.getCol(), currentPlayer);
                        while (board.getPiece(move.getRow(), move.getCol(), dir, dist) == getOpponent(currentPlayer)) {
                                board.setPiece(move.getRow(), move.getCol(), dir, dist, currentPlayer);
                                dist++;
                        }
                }
        }

        List<Integer> findDirections(int row, int col, int player) {
                List<Integer> directions = new ArrayList<Integer>();

                if (board.isEmpty(row, col)) {
                        for (int dir = 0; dir < OthelloBoard.NUM_DIRECTIONS; dir++) {
                                int dist = 1;
                                while (board.getPiece(row, col, dir, dist) == getOpponent(player)) {
                                        dist++;
                                }
                                if (dist > 1 && board.getPiece(row, col, dir, dist) == player) {
                                        directions.add(dir);
                                }
                        }
                }
                return directions;
        }

        boolean canPlace(int row, int col, int curPlayer) {
                return (!findDirections(row, col, curPlayer).isEmpty());
        }

        int getOpponent(int player) {
                return ((player + 1) % NUM_PLAYERS);
        }

        public void switchPlayer() {
                currentPlayer = getOpponent(currentPlayer);
        }

        public int getCurrentPlayer() {
                return currentPlayer;
        }
        
        public int getOutcome() {
                return (board.countPieces(0) - board.countPieces(1));
        }

        public void reset() {
                board.reset();
                currentPlayer = 0;
        }

        public Board getBoard() {
                return board;
        }
}