import javax.swing.ImageIcon;
import java.util.*;
public class Enemy extends Collidable{
    int xVelo, yVelo;
    boolean alive;
    
    public Enemy(int x, int y, int w, int h, int level){
        super(x,y,w,h,new ImageIcon("Sprites/Enemies/" + level + ".png"));
        xVelo = 2;
        yVelo = 0;
        alive = true;
    }
    
    public void moveX(int moveX){
        this.x += moveX;
        this.rect.x = this.x;
    }

    public void moveY(int moveY){
        this.y += moveY;
        this.rect.y = this.y;
    }
    
    public void patrol(ArrayList<Collidable> collidables){
        moveX(xVelo);
        
        for (Collidable c : collidables){
            if (this.collidesWith(c)){
                xVelo = -xVelo;
                moveX(xVelo * 2);
                break;
            }
        }
        
        // check edge detection - is there ground below next step?
        boolean edgeAhead = true;
        int nextX = this.x + xVelo;
        for (Collidable c : collidables) {
            if (c instanceof Tile) {
                Tile t = (Tile) c;
                // check if tile is below enemy's next position
                if (nextX + this.width > t.x && nextX < t.x + t.width &&
                    t.y == this.y + this.height) {
                    edgeAhead = false;
                    break;
                }
            }
        }
        if (edgeAhead) {
            xVelo = -xVelo;
        }
    }
}