import java.awt.*;
import java.util.LinkedList;

import javax.swing.ImageIcon;

public class PointToPointEnemy extends MovingObject {
	
	public int dx = 0;
	public int dy = 0;
	public double speed = 8.0; //šnskad fšrflyttningshastighet
	public LinkedList points = new LinkedList();
	public double distanceVectorX; //Vektorn mellan šnskad punkt och nuvarande (X)
	public double distanceVectorY; //Vektorn mellan šnskad punkt och nuvarande (Y)
	public double normDistX; //normaliserade vektorn
	public double normDistY; //normaliserade vektorn
	public Point currentPoint = new Point(); //TemporŠr punkt
	public boolean shoot = false;
	public int shootRange = 20;
	public int shootCount = 0;
	public double shootSpeed = 5.0;
	
	ImageIcon bild = new ImageIcon("skull.gif");
	Image bildobjekt = bild.getImage();
	private int imageHeight = 35;
	private int imageWidth =  35;
	
	public PointToPointEnemy() {
		//skapar ett kolissions-polygon
		this.polygon.addPoint(x, y);
		this.polygon.addPoint(x, y + imageHeight);
		this.polygon.addPoint(x + imageWidth, y + imageHeight);
		this.polygon.addPoint(x + imageWidth, y);	
	}
	
	public void setSpeed(double speed) {
		this.speed = speed;
	}
	
	public void setShoot(boolean p) {
		this.shoot = p;
	}
	
	public void addPoint(Point p) {
		points.add(p);
	}
	
	public void draw(Graphics g) {
		//g.setColor(Color.BLACK);
		//g.fillRect(x, y, width, height); //Ritar ut objektet i vald fŠrg
		g.drawImage(bildobjekt, x ,y, null);
		//g.setColor(Color.PINK);
		//g.drawPolygon(polygon);
	}
	
	public void setdxdy() {
		currentPoint = (Point) points.element(); //tempPoint  <- Fšrsta punkten pŒ listan
		distanceVectorX = currentPoint.x - this.x; //RŠknar ut vektorn mellan šnskad punkt och nuvarande (X)
		distanceVectorY = currentPoint.y - this.y; //RŠknar ut vektorn mellan šnskad punkt och nuvarande (Y)
		//normDistX = distanceVectorX / (Math.sqrt((double) (Math.pow(distanceVectorX, 2) + Math.pow(distanceVectorY, 2)))); //Normaliserar vektorn (X)
		//normDistY = distanceVectorY / (Math.sqrt((double) (Math.pow(distanceVectorX, 2) + Math.pow(distanceVectorY, 2)))); //Normaliserar vektorn (Y)
		
		if (speed <= (Math.sqrt((double) (Math.pow(distanceVectorX, 2) + Math.pow(distanceVectorY, 2))))) { //kollar om absolutbeloppet av vektorn Šr mindre Šn hastigheten
			dx = (int) (speed * (Math.cos(Math.atan2(distanceVectorY, distanceVectorX)))); //SŠtter dx till hastigheten i x-led utifrŒn vektorns riktining
			dy = (int) (speed * (Math.sin(Math.atan2(distanceVectorY, distanceVectorX)))); //SŠtter dy till hastigheten i y-led utifrŒn vektorns riktning
		}
		else {
			//SlŠnger den fšrsta punkten sist pŒ listan
			currentPoint = (Point) points.remove();
			points.add(currentPoint);
		}
	}
	
	public void shoot() {
		shootCount++;
		if (shootCount == shootRange) {
			shootCount = 0;
			//skapar ett kanonskott
			GunShot skott = new GunShot();
			skott.setPosition(x + width/2, y + height/2);
			skott.setSize(10, 10);
			skott.setDirection(normDistX, normDistY);
			skott.setSpeed(speed + shootSpeed);
			skott.setEnemy(true);
			level.playerObjects.add(skott);			
		}
	}
	
	public void clockTick() {
		setdxdy(); //AnvŠnder metoden setdxdy() fšr att bestŠmma hastigheten
		
		if (shoot) { //skjuter om den har blivigt tillsagd till det
			shoot();
		}
		
		this.y += dy; //fšrflyttar objektet i y-ledd
		this.x += dx; //fšrflyttar objektet i x-ledd
		
		//Fšrflyttar Šven objektets kollissionspolygon
		Polygon polly = new Polygon();
		polly.addPoint(x, y);
		polly.addPoint(x, y + imageHeight);
		polly.addPoint(x + imageWidth, y + imageHeight);
		polly.addPoint(x + imageWidth, y);
		this.polygon = polly;
	}	
}