// Brock Haun
// HELP! Nothing is working for part 3. I did everything, but no actual balls are produced on the applet.

package balls;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Rectangle;
import java.util.Random;

import javax.swing.JApplet;

public class BallsApplet extends JApplet {

	private int numBalls = 20; //just for private usage. makes code more readable.
	private Ball balls[] = new Ball[numBalls];

	private boolean stop = false; //private usage
	private Physics physics = new Physics(this,this,10);

	@Override
	public void init() {
		setSize(400, 500);
		//ball = new Ball(30, 30, 10, Color.GREEN);



		for (int i=0;i<numBalls;i++) {
			balls[i]= makeRandomBall();
			physics.addBall(balls[i]);
		} //for





		//physics.addBall(ball);
	} //init()

	@Override
	public void paint(Graphics g) {

		Rectangle bounds = getBounds();
		g.setColor(Color.lightGray);
		g.fillRect(0, 0, bounds.width, bounds.height);

		int redBalls = 0;
		int greenBalls = 0;

		for (int i=0;i<numBalls;i++) {
		 balls[i].draw(g);
		 if (balls[i].getColor().equals(Color.red))
			 redBalls++;
		 else greenBalls++;
		} //for


		//string output
		g.setColor(Color.blue);
		String greenCount = "Green balls: " + greenBalls;
		String redCount = "Red balls: " + redBalls;

		g.drawString(greenCount, 20, 20);
		g.drawString(redCount, 20, 30);
		g.drawString("Brock Haun" , 300, 10);

		if (greenBalls == 0)
			physics.stopIt();

	} //paint()

	private int randomRange(int low, int high) {
		Random r = new Random();
		int randomInt = r.nextInt(high)+ low;

		return randomInt;
	} //randomRange()

	private Ball makeRandomBall() {
		Random r = new Random();


		int randX = r.nextInt(180)+21; //instructions say between 20 and 200, not inclusive so ceiling=179,floor=21. rand starts at 0.
		int randY = r.nextInt(180)+21;
		int randRad = r.nextInt(7)+3; //same as before,  but BETWEEN 2 and 10, so 3-9

		//making random values for x and y is a 2 step process since we can't declare a negative range.
		//first we make a random int (0 or 1); then we take -1 and square it by the random int (0 or 1). if it is 0,
		//the sign won't change (stay positive). if it is 1, the sign will become negative.

		int sign = r.nextInt(2);

		double randVelX =  (Math.pow(-1, sign)*(r.nextInt(41)));
		double randVelY =  (Math.pow(-1, sign)*(r.nextInt(41)));

		Ball randomBall = new Ball(randX,randY,randRad,Color.green, randVelX, randVelY);

		return randomBall;
	} //makeRandomBall()

} //BallsApplet class