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package com.brettonw.game;

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

public class Referee {
    public static List getAvailableMoves (Board board) throws InvalidMoveException {
        byte[] test = board.getBoard ();
        ArrayList moves = new ArrayList<> (Board.SIZE);
        for (int y = 0; y < Board.DIMENSION; ++y) {
            for (int x = 0; x < Board.DIMENSION; x++) {
                Move move = new Move (x, y);
                int offset = move.getOffset ();
                if (test[offset] == Player.EMPTY) {
                    moves.add (move);
                }
            }
        }
        return moves;
    }

    private static final byte[][] wins = {
            {1, 1, 1, 0, 0, 0, 0, 0, 0, 3},
            {0, 0, 0, 1, 1, 1, 0, 0, 0, 3},
            {0, 0, 0, 0, 0, 0, 1, 1, 1, 3},

            {1, 0, 0, 1, 0, 0, 1, 0, 0, 3},
            {0, 1, 0, 0, 1, 0, 0, 1, 0, 3},
            {0, 0, 1, 0, 0, 1, 0, 0, 1, 3},

            {1, 0, 0, 0, 1, 0, 0, 0, 1, 3},
            {0, 0, 1, 0, 1, 0, 1, 0, 0, 3},

            {2, 2, 2, 0, 0, 0, 0, 0, 0, 6},
            {0, 0, 0, 2, 2, 2, 0, 0, 0, 6},
            {0, 0, 0, 0, 0, 0, 2, 2, 2, 6},

            {2, 0, 0, 2, 0, 0, 2, 0, 0, 6},
            {0, 2, 0, 0, 2, 0, 0, 2, 0, 6},
            {0, 0, 2, 0, 0, 2, 0, 0, 2, 6},

            {2, 0, 0, 0, 2, 0, 0, 0, 2, 6},
            {0, 0, 2, 0, 2, 0, 2, 0, 0, 6}
    };

    public static byte[][] getWins () {
        return wins;
    }

    public static int checkWinner (Board board) {
        byte[] test = board.getBoard ();
        for (byte[] win : wins) {
            int maskedSum = 0;
            for (int i = 0; i < Board.SIZE; ++i) {
                maskedSum += test[i] & win[i];
            }
            if (maskedSum == win[Board.SIZE]) {
                return win[Board.SIZE] / 3;
            }
        }
        return Player.EMPTY;
    }
}