/**
 ******************************************************************************
 *                    HOMEWORK 1, 15-211
 ******************************************************************************
 *
 * This is an interactive graphical application in which you navigate the
 * Snake by using the keyboard arrow keys.
 *
 * The game has several options that allow you to change the level of the game,
 * the background color, and to specify whether or not the caterpillar can pass
 * through itself.
 *
 *
 *
 * @author	V.Adamchik
 * @date		12/29/04
 * @see		Queue
 * @see		Snake
 *****************************************************************************/

 /*****************************************************************************

               There is no need to modify this file.

 *****************************************************************************/

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.border.Border;

public class GameApplet extends JApplet implements ActionListener, KeyListener, MouseListener, Runnable
{
   private Snake player;
	private Thread animate;
	private int level = 1;
	private boolean firstClick = true;
	private JFormattedTextField displayWindow, levelWindow;
   private JCheckBoxMenuItem selfCrossing;

   public void init()
   {
		setSize(500, 400);

			/* Create the menu bar and the menus */
		JMenuBar menubar = new JMenuBar();
		setJMenuBar(menubar);
		JMenu levelsMenu = new JMenu("Levels");
		menubar.add(levelsMenu);
		JMenu optionsMenu = new JMenu("Options");
		menubar.add(optionsMenu);
		JMenu helpMenu = new JMenu("Help");
		menubar.add(helpMenu);


			/* Create menu items for "Levels" */
		JMenuItem level1 = new JMenuItem("Beginner");
		level1.setAccelerator( KeyStroke.getKeyStroke("ctrl B") );
		level1.addActionListener(this);
		levelsMenu.add(level1);
		JMenuItem level2 = new JMenuItem("Intermediate");
		level2.setAccelerator( KeyStroke.getKeyStroke("ctrl I") );
		level2.addActionListener(this);
		levelsMenu.add(level2);
		JMenuItem level3 = new JMenuItem("Advanced");
		level3.setAccelerator( KeyStroke.getKeyStroke("ctrl A") );
		level3.addActionListener(this);
		levelsMenu.add(level3);

			/* Create menu items for "Options" */
		JMenuItem start = new JMenuItem("New Game");
		start.setAccelerator( KeyStroke.getKeyStroke("S") );
		start.addActionListener(this);
		optionsMenu.add(start);
		JMenuItem pause = new JMenuItem("Pause");
		pause.setAccelerator( KeyStroke.getKeyStroke("P") );
		pause.addActionListener(this);
		optionsMenu.add(pause);
		JMenuItem cont = new JMenuItem("Continue");
		cont.setAccelerator( KeyStroke.getKeyStroke("C") );
		cont.addActionListener(this);
		optionsMenu.add(cont);
		// Add a separating line to the menu.
		optionsMenu.addSeparator();
      selfCrossing = new JCheckBoxMenuItem("Allow self-crossing");
      selfCrossing.setSelected(true);
      optionsMenu.add(selfCrossing);
		optionsMenu.addSeparator();
		JMenu background = new JMenu("Background Color");
		optionsMenu.add(background);
		background.add("Magenta").addActionListener(this);
		background.add("Cyan").addActionListener(this);
		background.add("Yellow").addActionListener(this);
		background.add("Blue").addActionListener(this);
		background.add("White").addActionListener(this);

			/* Create menu items for "Help" */
		JMenuItem instr = new JMenuItem("Instructions");
		instr.setAccelerator( KeyStroke.getKeyStroke("H") );
		instr.addActionListener(this);
		helpMenu.add(instr);
		helpMenu.addSeparator();  // Add a separating line to the menu.
		JMenuItem feedback = new JMenuItem("Send Feedback");
		helpMenu.add(feedback);   // it is NOT implemented

			/* Create the score window. */
   	menubar.add(new JLabel("                                           "));
		displayWindow = new JFormattedTextField();
		displayWindow.setValue("0");
		displayWindow.setColumns(3);
		displayWindow.setForeground(Color.blue);
		displayWindow.setEditable(false);
		JLabel label1 = new JLabel("Score: ");
		label1.setLabelFor(displayWindow);
		menubar.add(label1);
		menubar.add(displayWindow);

   		/* Create the level window. */
   	menubar.add(new JLabel("      "));
		levelWindow = new JFormattedTextField();
		levelWindow.setValue("Beginner");
		levelWindow.setColumns(8);
		levelWindow.setForeground(Color.blue);
		levelWindow.setEditable(false);
		JLabel label2 = new JLabel("Level: ");
		label2.setLabelFor(levelWindow);
		menubar.add(label2);
		menubar.add(levelWindow);
   	menubar.add(new JLabel("  "));

   		/* Create the Snake window. */
		player = new Snake(getSize().width, getSize().height-30);//, food);
      player.addKeyListener(this);
      player.addMouseListener(this);

   		/* Draw a border around the play field */
		Border redline = BorderFactory.createLineBorder(Color.red);
		Border raisedbevel = BorderFactory.createRaisedBevelBorder();
		Border loweredbevel = BorderFactory.createLoweredBevelBorder();
		Border compound = BorderFactory.createCompoundBorder(raisedbevel, loweredbevel);
		compound = BorderFactory.createCompoundBorder(redline, compound);
		player.setBorder(compound);


   		/* add the play panel to the main panel */
		getContentPane().add(player);
		setVisible(true);
   }

	//runs after the applet is initialized and any time it has been "paused"
	public void start()
	{
		//if no animation is running
		if(animate == null)
		{
			animate = new Thread(this);
			animate.start();
		}
	}

	//runs while the applet is active
	public void run()
	{
		//while an animation should be running
		while(animate != null)
		{
			try
			{
				//a frame rate depends on the game level
				animate.sleep(115 + 15*(3-level));
				player.move();
				updateScore();
			}
			catch(InterruptedException e) {}
		}
	}

	//runs when the animation is "paused"
	public void stop()
	{
    	animate = null;
    	repaint();
	}

	/**
	 *   Request a current score from the player
    *
	 */
   public void updateScore()
   {
		displayWindow.setText(player.getScore()+"");
	}

	/**
	 *   Actions handler
	 *
	 */
   public void actionPerformed(ActionEvent e)
   {
		String command = e.getActionCommand();

		if(command.equals("Pause"))
		{
			player.pause(false);
		}
		else if(command.equals("Continue"))
		{
			player.pause(true);
		}
		else if(command.equals("New Game"))
		{
			player.pause(true);
			player.draw(level);
		}
		else if(command.equals("Beginner"))
		{
			level = 1;
			player.draw(1);
			levelWindow.setText("Beginner");
		}
		else if(command.equals("Intermediate"))
		{
			level = 2;
			player.draw(2);
			levelWindow.setText("Intermediate");
		}
		else if(command.equals("Advanced"))
		{
			level = 3;
			player.draw(3);
			levelWindow.setText("Advanced");
		}
		else if (command.equals("Magenta"))
			player.setBackground(new Color(1f,0.651f,1f));
		else if (command.equals("Cyan"))
			player.setBackground(new Color(0.5945f,1f,1f));
		else if (command.equals("Yellow"))
			player.setBackground(new Color(1f,1f,0.501961f));
		else if (command.equals("Blue"))
			player.setBackground(new Color(0.65f,0.827f,01f));
		else if (command.equals("White"))
			player.setBackground(Color.white);
		else if (command.equals("Instructions"))
		{
			JOptionPane.showMessageDialog(null,
	 "S - New Game\nP - Pause\nC - Continue\n\nUse arrow keys for navigation\n\nctrl+B - Beginner level\nctrl+I - Intermediate level\nctrl+A - Advanced level");
		}

		if(selfCrossing.isSelected())
			player.setCrossing(true);
		else
			player.setCrossing(false);
	}


	/**
	*   KeyListener handlers
	*
	*/
   public void keyPressed (KeyEvent e)
	{
		switch(e.getKeyCode())
		{
			case KeyEvent.VK_DOWN:  player.setDirection('D');  break;
			case KeyEvent.VK_UP:    player.setDirection('U');  break;
			case KeyEvent.VK_LEFT:  player.setDirection('L');  break;
			case KeyEvent.VK_RIGHT: player.setDirection('R');  break;
		}
	}
   public void keyReleased(KeyEvent e){}
   public void keyTyped(KeyEvent e){}


	/**
	*   MouseListener handlers
	*
	*/
   public void mousePressed(MouseEvent e)
   {
		player.requestFocus();  // Request the focus
   }
   public void mouseEntered(MouseEvent e)  {}
   public void mouseExited(MouseEvent e)   {}
   public void mouseReleased(MouseEvent e) {}
	public void mouseClicked(MouseEvent e)
	{
		if(firstClick)   //to start the game
		{
			firstClick = false;
			player.pause(true);
			player.draw(level);
		}
	}
}