package reversi.controller;

import java.awt.Frame;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.Stack;

import javax.swing.JComboBox;

import reversi.model.Board;
import reversi.model.Field;
import reversi.model.IllegalMoveException;
import reversi.model.Player;
import reversi.model.Reversi;
import reversi.view.ReversiField;
import reversi.view.ReversiView;

/**
 * Controller has an instance of the board and handles the
 * mouse and keyboard actions. Updates the gui if playBoard changes.
 */
public class ReversiController {

    private Player human = new Player(true);
    private Player bot = new Player(false);
    private Reversi model;
    private ReversiView view;
    private MachineMoveThread machineMoveThread;

    /**
     * Stack for UndoMove method.
     */
    private Stack<Reversi> pastMoves;

    /**
     * Create the model and the view.
     */
    public ReversiController() {
        this.model = new Reversi(human, bot, human);
        this.view = new ReversiView();
        addListener();
        this.view.updatePlayField(this.model);
        createStack();
    }

    /**
     * View the gui.
     */
    public final void showView() {
        this.view.setVisible(true);
    }

    /**
     * Opens a new reversi game.
     *
     * @param firstPlayer Player that starts
     * @return new reversi board
     */
    private Reversi newGame(Player firstPlayer) {

        stopMachineMoveThread();
        createStack();
        Reversi model = new Reversi(this.human, this.bot, firstPlayer);
        model.setLevel(this.view.getLevel());

        if (firstPlayer == bot) {
            performMachineMove(model);
        } else {
            this.view.updatePlayField(model);
            this.view.setMovePossible(true);
        }
        return model;
    }

    /**
     * Add all Listener in the gui.
     */
    private void addListener() {
        setPlayFieldListeners();
        this.view.setNewGameListener(new NewGameListener());
        this.view.setSwitchLevelListener(new SwitchLevelListener());
        this.view.setSwitchGameListener(new SwitchGameListener());
        this.view.setUndoMoveListener(new UndoMoveListener());
        this.view.setQuitGameListener(new QuitGameListener());
    }

    /**
     * Set the MouseListener for each PlayField.
     */
    private void setPlayFieldListeners() {
        for (int row = 0; row < Board.SIZE; row++) {
            for (int col = 0; col < Board.SIZE; col++) {
                this.view.setPlayFieldListener(
                        new FieldListener(), new Field(row, col));
            }
        }
    }

    /**
     * Init Stack and disable Undo Button.
     */
    private void createStack() {
        this.pastMoves = new Stack<Reversi>();
        view.setUndoButtonVisible(false);
    }

    /**
     * Return to the state of the board before the last human and bot move.
     */
    private void undoMove() {
        stopMachineMoveThread();
        this.model = pastMoves.pop();
        this.view.updatePlayField(this.model);

        if (pastMoves.isEmpty()) {
            this.view.setUndoButtonVisible(false);
        } else {
            this.view.setMovePossible(true);
        }
    }

    private void performMachineMove(Reversi model) {
        this.view.setMovePossible(false);
        machineMoveThread = new MachineMoveThread(model, this.view);
        machineMoveThread.start();
    }

    private void performHumanMove(Field field) {
        pastMoves.push(model.clone());
        view.setUndoButtonVisible(true);

        if (model.move(field.row(), field.col())) {
            if (model.next() == human && !model.gameOver()) {
                javax.swing.SwingUtilities.invokeLater(new Runnable() {
                    @Override
                    public final void run() {
                        view.viewMessage("The bot has to miss a turn");
                    }
                });
            }
        } else {
            undoMove();
        }

        view.updatePlayField(model);

        if (model.next() == bot) {
            performMachineMove(model);
        }
    }

    @SuppressWarnings("deprecation")
    private void stopMachineMoveThread() {
        if (machineMoveThread != null) {
            machineMoveThread.stop();
        }
    }

    /**
     * Inner class FieldListener performs a move on click and starts the
     * machine move. After every move, game over check is done.
     */
    private class FieldListener extends MouseAdapter {
        @Override
        public void mousePressed(final MouseEvent event) {
            if (!view.getMovePossible()) {
                new IllegalMoveException("Machine Move is active");
                return;
            }

            Field field = ((ReversiField) event.getComponent()).getField();
            performHumanMove(field);
        }
    }

    /**
     * Create Listener for the level switch combobox.
     */
    private class SwitchLevelListener implements ActionListener {
        @Override
        public void actionPerformed(final ActionEvent e) {
            @SuppressWarnings("unchecked")
            JComboBox<Integer> level = (JComboBox<Integer>) e.getSource();
            model.setLevel((Integer) level.getSelectedItem());
        }
    }

    /**
     * Create Listener for the new game button.
     */
    private class NewGameListener implements ActionListener {
        @Override
        public void actionPerformed(final ActionEvent e) {
            model = newGame(model.getFirstPlayer());
        }
    }

    /**
     * Create Listener for the switch game button.
     */
    private class SwitchGameListener implements ActionListener {
        @Override
        public void actionPerformed(final ActionEvent e) {

            if (model.getFirstPlayer() == human) {
                model = newGame(bot);
            } else {
                model = newGame(human);
            }
        }
    }

    /**
     * Create Listener for the undo move button.
     */
    private class UndoMoveListener implements ActionListener {
        @Override
        public void actionPerformed(final ActionEvent e) {
            undoMove();
        }
    }

    /**
     * Create Listener for the quit game button.
     */
    private class QuitGameListener implements ActionListener {
        @Override
        public void actionPerformed(final ActionEvent e) {
            for (Frame frame : java.awt.Frame.getFrames()) {
                frame.dispose();
            }
            stopMachineMoveThread();
        }
    }
}