import java.awt.*;

public class Square {
    
    public static boolean DEBUGGING = false;

    /**
     * EFFECT: Initialize a square with the given position (specified 
     * relative to the CS61BWindow in which all this is being run),
     * dimensions, and color.
     */
    public Square (int centerX, int centerY, int size, Color c) {
	myUpperLeftX = centerX - size/2;
	myUpperLeftY = centerY - size/2;
	mySize = size;
	myColor = c;
	myId = ourNextId;
	ourNextId++;
	if (DEBUGGING) {
	    System.out.println ("Square " + myId 
		+ " with size " + size 
		+ " and upper left corner ("
		+ myUpperLeftX + "," + myUpperLeftY
		+ ") is created.");
	}
    }

    /**
     * EFFECT: Return true if the square is covering coordinate (x,y);
     * return false otherwise.	
     */
    public boolean contains (int x, int y) {
	boolean result = x >= myUpperLeftX && x <= myUpperLeftX+mySize
	    && y >= myUpperLeftY && y <= myUpperLeftY+mySize;
	if (result && DEBUGGING) {
	    System.out.println ("Square " + myId + " is clicked on.");
	}
	return result;
    }

    /**
     * EFFECT: Return the identification # of this square.
     */
    public int id ( ) {
	return myId;
    }
	    
    /**
     * REQUIRES: o != null; o's type is a subclass of Square.
     * EFFECT: Returns true when this square has the same position
     * and dimensions as o.
     */
    public boolean equals (Object o) {
	Square sq = (Square) o;
	return myUpperLeftX == sq.myUpperLeftX
	  && myUpperLeftY == sq.myUpperLeftY
	  && mySize == sq.mySize;
    }
    
    /**
     * REQUIRES: g != null.
     * MODIFIES: the displayed window.
     * EFFECT: Draw the square, surrounded by a border.
     */
    public void paint (Graphics g) {
	g.setColor (myColor);
	g.fillRect (myUpperLeftX, myUpperLeftY, mySize, mySize);
	g.setColor (Color.black);
	g.drawRect (myUpperLeftX, myUpperLeftY, mySize, mySize);
    }
    
    private int myUpperLeftX;	// this square's upper left corner
    private int myUpperLeftY;
    private int mySize;	// this square's size
    private Color myColor;	// this square's color
    private int myId;	 // helps to tell squares apart when debugging
    static int ourNextId = 0;
}