valid reversi player

package cz.cvut.agents.rph.reversi.players.nguyet31;

import cz.cvut.agents.rph.reversi.ReversiMove;
import cz.cvut.agents.rph.reversi.ReversiPlayer;
import java.util.ArrayList;
import java.util.Arrays;


public class MyPlayer extends ReversiPlayer {

    @Override
    public String getName() {
        return "nguyet31";
    }

    @Override
    public ReversiMove makeNextMove(int[][] board) {

        for (int i = 0; i < this.height; i++) {
            for (int j = 0; j < this.width; j++) {
                if (board[i][j] == getEmptySquareColor()) {
                    if (isValidMove(board, i, j)) {
                        return new ReversiMove(i, j);
                    }
                }
            }
        }
        return new ReversiMove(0, 0);
    }
    public int biggerNumber() {
        if (this.height > this.width) return this.height;
        else return this.width;
    }

    public int getColor(int[][] board, int x, int y) {
        if ((x < 0) || (y < 0) || (x > board.length-1) || (y > board.length-1)) {
            return getEmptySquareColor();
        } else {
            return board[x][y];
        }

    }


    public boolean isValidMove(int[][] board, int x, int y) {
        int[][] directions = new int[8][biggerNumber()]; //8 směrů, počet polí
        for (int i = 0; i < 8; i++) {
            Arrays.fill(directions[i], getEmptySquareColor()); // naplnim to prázdnotou
        }

        for (int i = 0; i < biggerNumber(); i++) {
            directions[0][i] = getColor(board, x + i, y);
            directions[1][i] = getColor(board, x + i, y + i);
            directions[2][i] = getColor(board, x + i, y - i);
            directions[3][i] = getColor(board, x - i, y + i);
            directions[4][i] = getColor(board, x - i, y - i);
            directions[5][i] = getColor(board, x - i, y);
            directions[6][i] = getColor(board, x, y - i);
            directions[7][i] = getColor(board, x, y + i);
        }
        for (int i = 0; i < 8; i++) {
            if (directions[i][1] == getOpponentColor()) {
                for (int j = 1; j < biggerNumber(); j++) {
                    if (directions[i][j] != getOpponentColor()) {
                        if (directions[i][j] == this.getMyColor()) {
                            return true;
                        } else {
                            break;
                        }
                    }
                }

            }

        }
        return false;
    }

}