/*
    CuckooChess - A java chess program.
    Copyright (C) 2011  Peter Österlund, peterosterlund2@gmail.com

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

package chess;

import java.util.ArrayList;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;
import static org.junit.Assert.*;

/**
 *
 * @author petero
 */
public class ComputerPlayerTest {

    public ComputerPlayerTest() {
    }

    @BeforeClass
    public static void setUpClass() throws Exception {
    }

    @AfterClass
    public static void tearDownClass() throws Exception {
    }

    /**
     * Test of getCommand method, of class ComputerPlayer.
     */
    @Test
    public void testGetCommand() throws ChessParseError {
        System.out.println("getCommand");
        ArrayList<Position> nullHist = new ArrayList<Position>();

        Position pos = TextIO.readFEN("7k/5Q2/p5K1/8/8/8/8/8 b - - 99 80");
        ComputerPlayer cp = new ComputerPlayer();
        cp.maxDepth = 1;
        cp.maxTimeMillis = -1;
        cp.verbose = false;
        String result = cp.getCommand(pos, false, nullHist);
        assertEquals("a5", result);     // Only one legal move

        pos = TextIO.readFEN("7k/5Q2/p5K1/8/8/8/8/8 b - - 100 80");
        result = cp.getCommand(pos, false, nullHist);
        assertEquals("draw 50", result);    // Should claim draw without making a move
        
        pos = TextIO.readFEN("3k4/1R6/R7/8/8/8/8/1K6 w - - 100 80");
        result = cp.getCommand(pos, false, nullHist);
        assertEquals("Ra8#", result);       // Can claim draw, but should not
        
        pos = TextIO.readFEN("8/1R5k/R7/8/8/8/B7/1K6 b - - 99 80");
        result = cp.getCommand(pos, false, nullHist);
        assertEquals("draw 50 Kh8", result);     // Should claim draw by 50-move rule

        // Only one possible move. Should realize that draw claim is possible, but very bad
        pos = TextIO.readFEN("6Nk/8/5K1R/q7/q7/q7/8/8 b - - 100 80");
        result = cp.getCommand(pos, false, nullHist);
        assertEquals("Kxg8", result);
    }

    /**
     * Test of draw by repetition, of class ComputerPlayer.
     */
    @Test
    public void testDrawRep() throws ChessParseError {
        System.out.println("drawRep");
        Game game = new Game(new HumanPlayer(), new HumanPlayer());
        ComputerPlayer cp = new ComputerPlayer();
        cp.maxDepth = 3;
        cp.maxTimeMillis = -1;
        cp.verbose = false;
        game.processString("setpos 7k/5RR1/8/8/8/8/q3q3/2K5 w - - 0 1");
        game.processString("Rh7");
        game.processString("Kg8");
        game.processString("Rhg7");
        String result = cp.getCommand(new Position(game.pos), false, game.getHistory());
        assertEquals("Kh8", result); // Not valid to claim draw here
        game.processString("Kh8");
        game.processString("Rh7");
        game.processString("Kg8");
        game.processString("Rhg7");
        result = cp.getCommand(new Position(game.pos), false, game.getHistory());
        assertEquals("draw rep Kh8", result);   // Can't win, but can claim draw.
        
        game.processString("setpos 7k/R7/1R6/8/8/8/8/K7 w - - 0 1");
        game.processString("Ra8");
        game.processString("Kh7");
        result = cp.getCommand(new Position(game.pos), false, game.getHistory());
        assertEquals("Ra7+", result);       // Ra7 is mate-in-two
        game.processString("Ra7");
        game.processString("Kh8");
        game.processString("Ra8");
        game.processString("Kh7");
        result = cp.getCommand(new Position(game.pos), false, game.getHistory());
        assertTrue(!result.equals("Ra7+")); // Ra7 now leads to a draw by repetition
    }
}