import java.awt.*;
import java.awt.event.*;
import java.util.*;

class CS61BWindow extends Frame implements MouseListener, WindowListener {
    
    public static boolean DEBUGGING = false;
    private final int DEFAULT_WIDTH = 800;
    private final int DEFAULT_HEIGHT = 700;
    
    /**
     * EFFECTS: Initialize and display a CS61BWindow object.
     */
    public CS61BWindow ( ) {
	myWidth = DEFAULT_WIDTH;
	myHeight = DEFAULT_HEIGHT;
	this.addMouseListener (this);
	this.addWindowListener (this);
	setSize (myWidth, myHeight);
	myRegions = new RegionStack ( );
	setVisible (true);
    }

    /**
     * REQUIRES: x >= 0; y >= 0.
     * EFFECTS: Initialize and display a CS61BWindow object
     * with the given width and height.
     */
    public CS61BWindow (int width, int height) {
	myWidth = width;
	myHeight = height;
	this.addMouseListener (this);
	this.addWindowListener (this);
	setSize (myWidth, myHeight);
	myRegions = new RegionStack ( );
	setVisible (true);
    }

    /**
     * REQUIRES: r != null.
     * MODIFIES: this.
     * EFFECTS: Add a region on top of the window's stack of regions
     * and redraw the stack.
     */
    public void addRegion (Region r) {
	myRegions.add (r);
	repaint ( );
    }

    /**
     * REQUIRES: g != null.
     * EFFECTS: Display the regions from bottom to top.
     */
    public void paint (Graphics g) {
	Iterator iter = myRegions.regions ( );
	while (iter.hasNext ( )) {
	    Region r = (Region) iter.next ( );
	    r.paint (g);
	}
    }
    
    /**
     * REQUIRES: 0 <= x < myWidth; 0 <= y < myHeight.
     * EFFECTS: Simulates a mouse click at the point (x,y)
     * in the window.
     */
    public void simulateClick (int x, int y) {
	myRegions.handleClick (x, y);
	repaint ( );
    }
    
    /**
     * REQUIRES: event != null.
     * MODIFIES: this; System.out if DEBUGGING.
     * EFFECTS: Handle a mouse click.
     */
    public void mousePressed (MouseEvent event) {
	int mouseX = event.getX ( );
	int mouseY = event.getY ( );
	if (DEBUGGING) {
	    System.out.println ("");
	    System.out.println ("Mouse click at (" 
		+ mouseX + "," + mouseY + ")");
	}
	myRegions.handleClick (mouseX, mouseY);
	repaint ( );
    }
    
    /**
     * All these are required to implement the MouseListener interface.
     */
    public void mouseClicked (MouseEvent event) {
    }
    
    public void mouseReleased (MouseEvent event) {
    }
    
    public void mouseEntered (MouseEvent event) {
    }
    
    public void mouseExited (MouseEvent event) {
    }
	    
    /**
     * REQUIRES: event != null.
     * EFFECTS: The user has clicked the "close" box of the window,
     * so quit the program.
     */
    public void windowClosing (WindowEvent event) {
	System.exit (0);
    }
    
    /**
     * All these are required to implement the WindowListener interface.
     */
    public void windowIconified (WindowEvent event) {
    }
    
    public void windowOpened (WindowEvent event) {
    }
    
    public void windowClosed (WindowEvent event) {
    }
    
    public void windowDeiconified (WindowEvent event) {
    }
    
    public void windowActivated (WindowEvent event) {
    }
	    
    public void windowDeactivated (WindowEvent event) {
    }
    
    private int myWidth;	// window width in pixels
    private int myHeight;	// window height in pixels
    private RegionStack myRegions;	// regions in the window
}