import static org.junit.jupiter.api.Assertions.assertArrayEquals;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertTrue;
import org.junit.jupiter.api.Test;

public class TestForza4 {

    final char[][] board1 = {{'X', ' ', ' ', ' '}, {'O', 'O', 'O', ' '}};

    char[][] deepCopy(char[][] a) {
        char[][] result = new char[a.length][];
        for (int i = 0; i < a.length; i++)
            result[i] = a[i].clone();
        return result;
    }

    @Test
    void testCreateBoard() {
        char[][] result = {{' ', ' ', ' '}, {' ', ' ', ' '}};
        assertArrayEquals(result, Forza4.createEmptyBoard(2, 3));
    }

    @Test
    void testCheckMove() {
        assertFalse(Forza4.checkMove(board1, -1));
        assertFalse(Forza4.checkMove(board1, 4));
        assertTrue(Forza4.checkMove(board1, 1));
        assertFalse(Forza4.checkMove(board1, 0));
    }

    @Test
    void testMove() {
        var board = deepCopy(board1);
        Forza4.move(board, 1, 'X');
        assertArrayEquals(new char[][] {{'X', 'X', ' ', ' '}, {'O', 'O', 'O', ' '}}, board);
        board = deepCopy(board1);
        Forza4.move(board, 3, 'X');
        assertArrayEquals(new char[][] {{'X', ' ', ' ', ' '}, {'O', 'O', 'O', 'X'}}, board);
        board = deepCopy(board1);
        Forza4.move(board, 3, 'O');
        assertArrayEquals(new char[][] {{'X', ' ', ' ', ' '}, {'O', 'O', 'O', 'O'}}, board);
    }

    @Test
    void testNextPlayer() {
        assertEquals('X', Forza4.nextPlayer('O'));
        assertEquals('O', Forza4.nextPlayer('X'));
    }

}