package tictactoe;

import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;

public class TicTacToe extends JFrame implements ActionListener {

    private JButton[] cells;
    private final String PLAYER1 = "X";
    private final String PLAYER2 = "O";
    private String currentPlayer = PLAYER1;

    private boolean isGameOver = false;

    public TicTacToe() {
        setLayout(new GridLayout(3, 3));
        cells = new JButton[9];
        for (int i = 0; i < cells.length; i++) {
            cells[i] = new JButton();
            cells[i].setFont(new Font(Font.SANS_SERIF, Font.PLAIN, 50));
            cells[i].setPreferredSize(new Dimension(100, 100));
            cells[i].addActionListener(this);
            add(cells[i]);
        }
        pack();

    }

    public static void main(String[] args) {
        TicTacToe ttt = new TicTacToe();
        ttt.setVisible(true);
        ttt.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    }

    @Override
    public void actionPerformed(ActionEvent e) {
        if (isGameOver) {
            return;
        }
        JButton currentCell = (JButton) e.getSource();
        if (currentCell.getText().length() > 0) {
            return;
        }
        currentCell.setText(currentPlayer);
        if (hasWon(currentPlayer)) {
            isGameOver = true;
            JOptionPane.showMessageDialog(this, currentPlayer + "has won");
            return;
        }
        currentPlayer = currentPlayer.equals(PLAYER1) ? PLAYER2 : PLAYER1;

    }

    public boolean hasWon(String player) {
        if (player.equals(cells[0].getText())
                && player.equals(cells[1].getText())
                && player.equals(cells[2].getText())) {
            return true;
        }
        if (player.equals(cells[3].getText())
                && player.equals(cells[4].getText())
                && player.equals(cells[5].getText())) {
            return true;
        }
        if (player.equals(cells[6].getText())
                && player.equals(cells[7].getText())
                && player.equals(cells[8].getText())) {
            return true;
        }
        if (player.equals(cells[0].getText())
                && player.equals(cells[3].getText())
                && player.equals(cells[6].getText())) {
            return true;
        }
        if (player.equals(cells[1].getText())
                && player.equals(cells[4].getText())
                && player.equals(cells[7].getText())) {
            return true;
        }
        if (player.equals(cells[3].getText())
                && player.equals(cells[5].getText())
                && player.equals(cells[8].getText())) {
            return true;
        }
        if (player.equals(cells[0].getText())
                && player.equals(cells[4].getText())
                && player.equals(cells[8].getText())) {
            return true;
        }
        if (player.equals(cells[2].getText())
                && player.equals(cells[4].getText())
                && player.equals(cells[6].getText())) {
            return true;
        }
        return false;
    }

}