Othello/src/othello/State.java

package othello;

import othello.players.Player;

import java.util.LinkedList;
import java.util.List;

public class State {

	public static List<State> previousSituations = new LinkedList<>();

	private final Player[][] board;
	private final Player player1;
	private final Player player2;
	private Player currentPlayer;
	private int n1;
	private int n2;

	public State(Player[][] board, Player p1, Player p2) {
		this.board = board;
		this.player1 = p1;
		this.player2 = p2;
		currentPlayer = p1;
		this.n1 = 2;
		this.n2 = 2;
	}
	
	public boolean isOver() {
		return n1 == 0 || n2 == 0 || (getMove(player1).isEmpty() && getMove(player2).isEmpty());
	}

	public Player getPlayerById(int id) {
		if(id == 1)
			return player1;
		else if(id == -1)
			return player2;
		throw new IllegalArgumentException("Invalid player id: " + id);
	}
	
	public LinkedList<Pair<Point, Point>> getMove(Player player) {
		// Pair<Depart, Arrivee>
		LinkedList<Pair<Point, Point>> moves = new LinkedList<>();
		// Parcours du plateau de jeu
		for (int y = 0; y < this.board.length; y++) {
			for (int x = 0; x < this.board[y].length; x++) {
				if (this.board[y][x] == player) {
					// Recherche autour du pion du joueur courant
					for (int deltaY = -1; deltaY < 2; deltaY++) {
						for (int deltaX = -1; deltaX < 2; deltaX++) {
							// La position du pion trouvée est exclue
								// Si une place libre est trouvée elle est ajoutée à la liste des coups
								try {
									Point current = new Point(y, x);
									if (this.board[y+deltaY][x+deltaX] == null) {
										moves.add(new Pair<>(current, new Point(y + deltaY, x + deltaX)));
									}
									Point other = new Point(y + 2 * deltaY, x + 2 * deltaX);
									if(this.board[other.getY()][other.getX()] == null && current.isJump(other))
										moves.add(new Pair<>(current, other));
								} catch(ArrayIndexOutOfBoundsException ignored) {}
						}
					}
				}
			}
		}
		return moves;
	}
	
	public int getScore(Player player) {
		return player == player1 ? n1 : n2;
	}

	public Player getWinner() {
		int scoreP1 = getScore(player1), scoreP2 = getScore(player2);
		if(scoreP1 > scoreP2)
			return player1;
		else if(scoreP2 > scoreP1)
			return player2;
		return null;
	}

	public State play(Pair<Point,Point> move) {
		State copy = this.copy();
		copy.board[move.getRight().getY()][move.getRight().getX()] = copy.getCurrentPlayer();
		for(int i = -1; i < 2; i++){
			for(int z = -1; z < 2; z++){
				try {
					if(copy.board[move.getRight().getY() + i][move.getRight().getX() + z] != copy.getCurrentPlayer()
							&& !move.getLeft().isJump(move.getRight())){
						copy.board[move.getRight().getY() + i][move.getRight().getX() + z] = copy.getCurrentPlayer();
					}
				} catch (IndexOutOfBoundsException ignored) {}
			}
		}
		int ni = 0, nj = 0;
		for(int i = 0; i < board.length; i++) {
			for(int j = 0; j < board[i].length; j++) {
				if(board[i][j] == player1){
					ni++;
				}
				if(board[i][j] == player2){
					nj++;
				}
			}
		}
		copy.n1 = ni;
		copy.n2 = nj;
		copy.switchPlayer();
		return copy;
	}
	public Player getCurrentPlayer() {
		return currentPlayer;
	}
	
	public void setCurrentPlayer(Player currentPlayer) {
		this.currentPlayer = currentPlayer;
	}

	public State copy () {
		State copy = new State(this.board, this.player1, this.player2);
		for (int i = 0; i < this.board.length; i++) {
			System.arraycopy(this.board[i], 0, copy.board[i], 0, this.board.length);
		}
		copy.setCurrentPlayer(this.currentPlayer);
		copy.n1 = n1;
		copy.n2 = n2;
		return copy;
	}
	
	public void switchPlayer() {
		setCurrentPlayer(getCurrentPlayer() == this.player1 ? player2 : player1);
	}
	
	/**
	 * TODO: display the current state of the board
	 */
	@Override
	public String toString() {
		StringBuilder str = new StringBuilder();
		for (Player[] players : board) {
			for (int x = 0; x < board.length; x++) {
				if (players[x] == player1)
					str.append("O");
				else if (players[x] == player2)
					str.append("X");
				else
					str.append(".");
				str.append(" ");
			}
			str.append("\r\n");
		}
		return str.toString();
	}
	
}