import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;


public class Jumper implements KeyListener {
	double x, y, vx ,vy;
	private boolean onTheGround;
	public static final double GRAVITY = 20;
	public static final double FRICTION = 0.75;
	public Jumper() {
		x = y = vx = vy = 0;
	}
	public void setNotOnGround() {
		this.onTheGround = false;
	}
	public void tick(double dt) {
		if (this.onGround()) {
			vx *= FRICTION; 
		} else {
			vy += GRAVITY * dt;
		}
		x += vx;
		y += vy;
		if (vy < 0) {
			this.onTheGround = false;
		}
	}
	private boolean onGround() {
		return this.onTheGround;
	}
	@Override
	public void keyPressed(KeyEvent e) {
		if(e.getKeyCode() == KeyEvent.VK_LEFT) {
			vx = -3;
		}
		if(e.getKeyCode() == KeyEvent.VK_RIGHT) {
			vx = 3;
		}
		if(e.getKeyCode() == KeyEvent.VK_UP && this.onGround()) {
			vy = -10;
		}
		
	}
	@Override public void keyReleased(KeyEvent e) {}
	@Override public void keyTyped(KeyEvent e) {}
	
	public Rectangle bounds() {
		return new Rectangle((int)(x-10), (int)(y-30), 20, 60);
	}
	
	public void draw(Graphics2D g) {
		g.setColor(Color.DARK_GRAY);
		g.fillOval((int)(x-10), (int)(y-30), 20, 60);
	}
	public void bumpInto(Rectangle r) {
		if(this.bounds().intersects(r)) {
			Rectangle overlap = this.bounds().intersection(r);
			if (overlap.width < overlap.height) {
				this.vx = 0;
				if(this.x > r.getCenterX()) {
					this.x = 10 + r.getMaxX();
				} else {
					this.x = r.getMinX() - 10;
				}
			} else {
				this.vy = 0;
				if(this.y > r.getCenterY()) {
					// TODO: break blocks
					this.y = r.getMaxY() + 30;
				} else {
					// hit the top
					this.onTheGround = true;
					this.y = (int)r.getMinY() - 29;
				}
			}
		}
	}
}