/**
 * File: GUI.java
 * Author: Brian Borowski
 * Date created: May 1999
 * Date last modified: July 6, 2011
 */
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Event;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import java.awt.Insets;
import java.awt.Point;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.awt.event.KeyEvent;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.KeyStroke;
import javax.swing.Timer;
import javax.swing.border.BevelBorder;
import javax.swing.border.EtchedBorder;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

public class GUI extends JFrame implements ActionListener {
    public static final String
        APP_NAME = "Game of Life",
        IDLE_MESSAGE = "Click on the cells where you want \"life\" to exist.",
        RUNNING_MESSAGE = "Game in progress...";
    public static final int FPS_MIN = 0, FPS_MAX = 30, FPS_INIT = 10;

    private static final long serialVersionUID = 1L;

    private final ApplicationStarter applicationStarter;
    private final JButton startResetButton;
    private final JComboBox presetComboBox, boardTypeComboBox;
    private final JLabel statusLabel, generationLabel;
    private final JSlider slider;
    private final LifeBoard lifeBoard;
    private final Timer timer;

    private long generationNumber;
    private boolean isGameRunning;

    public GUI(final ApplicationStarter appStarter) {
        super(APP_NAME);
        this.applicationStarter = appStarter;
        this.lifeBoard = new LifeBoard(LifeBoard.FINITE, "images/smallSmile.gif", 20, 38);

        // Set up timer to drive animation events.
        timer = new Timer(fpsToMs(FPS_INIT), this);

        setJMenuBar(getCreatedMenuBar());

        startResetButton = new JButton("Start");
        startResetButton.setMnemonic('S');
        startResetButton.setPreferredSize(new Dimension(84, 26));
        startResetButton.addActionListener(new StartResetActionListener(this));

        final JPanel buttonPanel = new JPanel();
        buttonPanel.setLayout(new FlowLayout());
        buttonPanel.add(startResetButton);

        final JPanel boardPanel = new JPanel();
        boardPanel.setLayout(new FlowLayout());
        boardPanel.add(lifeBoard);

        final JPanel mainPanel = new JPanel();
        mainPanel.setLayout(new BorderLayout());
        mainPanel.add(boardPanel, BorderLayout.CENTER);
        mainPanel.add(buttonPanel, BorderLayout.SOUTH);
        mainPanel.setBorder(BorderFactory.createTitledBorder(
            BorderFactory.createEtchedBorder(EtchedBorder.LOWERED), "Playing Field"));

        final JLabel blankLabel = new JLabel();

        boardTypeComboBox = new JComboBox();
        boardTypeComboBox.setBackground(Color.WHITE);
        for (int i = 0; i < LifeBoard.BOARDTYPES.length; ++i) {
            boardTypeComboBox.addItem(LifeBoard.BOARDTYPES[i]);
        }
        boardTypeComboBox.addItemListener(new ItemListener() {
            public void itemStateChanged(final ItemEvent ie) {
                if (ie.getStateChange() == ItemEvent.SELECTED) {
                    lifeBoard.setBoardType(boardTypeComboBox.getSelectedIndex());
                }
            }
        });
        final JLabel boardTypeLabel =
            new JLabel("Board Type:", JLabel.RIGHT);
        boardTypeLabel.setDisplayedMnemonic('B');
        boardTypeLabel.setLabelFor(boardTypeComboBox);

        final String[] presetConfigs = ConfigurationManager.getListing("config/Listing");
        presetComboBox = new JComboBox();
        presetComboBox.setBackground(Color.WHITE);
        presetComboBox.addItem("Blank board");
        presetComboBox.addItem("Random board");
        for (int i = 0; i < presetConfigs.length; ++i) {
            presetComboBox.addItem(presetConfigs[i]);
        }
        presetComboBox.addActionListener(new ActionListener() {
            public void actionPerformed(final ActionEvent e) {
                lifeBoard.clear();
                if (presetComboBox.getSelectedIndex() == 1) {
                    lifeBoard.setRandomConfig();
                } else if (presetComboBox.getSelectedIndex() > 1) {
                    lifeBoard.setPresetConfig(
                        ConfigurationManager.getConfiguration(
                            (String)presetComboBox.getSelectedItem()));
                }
            }
        });
        final JLabel configurationsLabel =
            new JLabel("Configurations:", JLabel.RIGHT);
        configurationsLabel.setDisplayedMnemonic('C');
        configurationsLabel.setLabelFor(presetComboBox);

        slider = new JSlider(JSlider.HORIZONTAL, FPS_MIN, FPS_MAX, FPS_INIT);
        slider.setMajorTickSpacing(10);
        slider.setMinorTickSpacing(1);
        slider.setPaintTicks(true);
        slider.setPaintLabels(true);
        slider.setFont(new Font("Serif", Font.ITALIC, 12));
        slider.addChangeListener(new ChangeListener() {
            public void stateChanged(final ChangeEvent e) {
                final JSlider source = (JSlider)e.getSource();
                if (!source.getValueIsAdjusting()) {
                    setSpeed(source.getValue());
                }
            }
        });

        final JLabel speedLabel =
            new JLabel("Speed (FPS):", JLabel.RIGHT);
        speedLabel.setDisplayedMnemonic('F');
        speedLabel.setLabelFor(slider);

        final JPanel controlPanel = new JPanel();
        controlPanel.setLayout(new FlowLayout());
        controlPanel.setBorder(BorderFactory.createTitledBorder(
            BorderFactory.createEtchedBorder(EtchedBorder.LOWERED), "Options"));
        controlPanel.add(boardTypeLabel);
        controlPanel.add(boardTypeComboBox);
        controlPanel.add(blankLabel);
        controlPanel.add(configurationsLabel);
        controlPanel.add(presetComboBox);
        controlPanel.add(blankLabel);
        controlPanel.add(speedLabel);
        controlPanel.add(slider);

        statusLabel = new JLabel(IDLE_MESSAGE);
        generationLabel = new JLabel();

        final GridBagConstraints gbc = new GridBagConstraints();
        gbc.insets = new Insets(0, 0, 2, 0);
        final JPanel statusPanel1 = new JPanel();
        statusPanel1.setLayout(new GridBagLayout());
        statusPanel1.setBorder(new BevelBorder(BevelBorder.LOWERED));
        statusPanel1.add(statusLabel, gbc);
        final JPanel statusPanel2 = new JPanel();
        statusPanel2.setLayout(new GridBagLayout());
        statusPanel2.setBorder(new BevelBorder(BevelBorder.LOWERED));
        statusPanel2.add(generationLabel, gbc);

        final JPanel statusPanel = new JPanel();
        statusPanel.setLayout(new GridLayout(1, 2));
        statusPanel.add(statusPanel1);
        statusPanel.add(statusPanel2);

        final Container contentPane = getContentPane();
        contentPane.setLayout(new BorderLayout());
        contentPane.add(mainPanel, BorderLayout.PAGE_START);
        contentPane.add(controlPanel, BorderLayout.CENTER);
        contentPane.add(statusPanel, BorderLayout.PAGE_END);

        setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
        addWindowListener(new ClosingWindowListener(this));
        validate();
        pack();
        setResizable(false);
        final Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
        final Point p = new Point((int)((d.getWidth() - this.getWidth())/2),
                                  (int)((d.getHeight() - this.getHeight())/2));
        setLocation(p);
        setVisible(true);
    }

    public void start() {
        timer.restart();
    }

    public void stop() {
        timer.stop();
    }

    public void actionPerformed(final ActionEvent e) {
        lifeBoard.makeNextGeneration();
        generationLabel.setText("Generation: " + ++generationNumber);
        if (!lifeBoard.isAnyCellAlive()) {
            final String message =
                generationNumber == 2 ?
                    "Your configuration killed everyone off in 1 generation." :
                    "Your configuration killed everyone off in " +
                    (generationNumber - 1)  + " generations.";
            new MessageBox(this, "Too Bad", message, MessageBox.FROWN);
            resetGame();
        }
    }

    private JMenuBar getCreatedMenuBar() {
        final JMenuBar menuBar = new JMenuBar();
        final JMenu fileMenu = new JMenu("File");
        fileMenu.setMnemonic('F');

        KeyStroke ks;
        final JMenuItem exitItem = new JMenuItem("Exit");
        ks = KeyStroke.getKeyStroke(KeyEvent.VK_X, Event.ALT_MASK);
        exitItem.setAccelerator(ks);
        exitItem.setMnemonic(KeyEvent.VK_X);
        exitItem.addActionListener(new ExitActionListener(this));
        fileMenu.add(exitItem);

        final JMenuItem aboutItem = new JMenuItem("About");
        aboutItem.setMnemonic('A');
        aboutItem.addActionListener(new AboutActionListener(this));

        final JMenu helpMenu = new JMenu("Help");
        helpMenu.setMnemonic('H');
        helpMenu.add(aboutItem);

        menuBar.add(fileMenu);
        menuBar.add(helpMenu);

        return menuBar;
    }

    private void setSpeed(final int fps) {
        if (fps == 0) {
            stop();
        } else {
            if (isGameRunning && !timer.isRunning()) {
                start();
            }
            timer.setDelay(fpsToMs(fps));
        }
    }

    private int fpsToMs(final int fps) {
        if (fps == 0) {
            return Integer.MAX_VALUE;
        }
        return 1000 / fps;
    }

    private void doApplicationClosing(final JFrame parent) {
        if (applicationStarter != null) {
            applicationStarter.close();
        } else {
            System.exit(0);
        }
    }

    private void startGame() {
        isGameRunning = true;
        startResetButton.setText("Reset");
        startResetButton.setMnemonic('R');
        statusLabel.setText("Game in session...");
        boardTypeComboBox.setEnabled(false);
        presetComboBox.setEnabled(false);
        lifeBoard.setEditable(false);
        generationNumber = 1;
        generationLabel.setText("Generation: " + generationNumber);
        setSpeed(slider.getValue());
    }

    private void resetGame() {
        stop();
        isGameRunning = false;
        startResetButton.setText("Start");
        startResetButton.setMnemonic('S');
        boardTypeComboBox.setEnabled(true);
        presetComboBox.setEnabled(true);
        presetComboBox.setSelectedIndex(0);
        generationLabel.setText("");
        statusLabel.setText(IDLE_MESSAGE);
        lifeBoard.clear();
        lifeBoard.setEditable(true);
    }

    class StartResetActionListener implements ActionListener {
        private final JFrame parent;

        public StartResetActionListener(final JFrame parent) {
            this.parent = parent;
        }

        public void actionPerformed(final ActionEvent e) {
            if (!lifeBoard.isAnyCellAlive()) {
                new MessageBox(parent, "Error",
                    "Board has not been initialized.", MessageBox.EXCLAIM);
                return;
            }
            if (startResetButton.getText().equals("Start")) {
                startGame();
            } else {
                resetGame();
            }
        }
    }

    class ExitActionListener implements ActionListener {
        private final JFrame parent;

        public ExitActionListener(final JFrame parent) {
            this.parent = parent;
        }

        public void actionPerformed(final ActionEvent e) {
            doApplicationClosing(parent);
        }
    }

    class AboutActionListener implements ActionListener {
        private final JFrame parent;

        public AboutActionListener(final JFrame parent) {
            this.parent = parent;
        }

        public void actionPerformed(final ActionEvent e) {
            final String[] data = {"Version 2.0.5",
                             "© 1999-2002, 2011 Brian S. Borowski",
                             "Concept by John H. Conway",
                             "Examples by Kruse and Ryba",
                             "All Rights Reserved."};
            new AboutDialog(parent, APP_NAME, data,
                "images/information.gif");
        }
    }

    class ClosingWindowListener implements WindowListener {
        private final JFrame parent;

        public ClosingWindowListener(final JFrame parent) {
            this.parent = parent;
        }

        public void windowClosing(final WindowEvent e) {
            doApplicationClosing(parent);
        }

        public void windowDeactivated(final WindowEvent e) { }

        public void windowActivated(final WindowEvent e) { }

        public void windowDeiconified(final WindowEvent e) { }

        public void windowIconified(final WindowEvent e) { }

        public void windowClosed(final WindowEvent e) { }

        public void windowOpened(final WindowEvent e) { }
    }
}