import greenfoot.*;  // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)

/**
 * Show (approximately) how much health the corresponding player has. Actually, just show one out of 100 different
 * health bar graphics based on two variables.
 * 
 * @author Martin Schend, Jannis Andrija Schnitzer
 * @version 2011-01-21
 */
public class HealthBar  extends Actor
{
    /**
     * Current health.
     */
    protected int health;
    protected int max_health;
    protected int side;
    
    public HealthBar()
    {
        health = 580;
        max_health = 1000;
        draw();
    }
    
    public void setHealth (int newHealth) {
        health = newHealth;
        draw();
    }
    public void setSide(int newSide) {
        side = newSide;
        draw();
    }
    
    public void setMaxHealth(int new_max_health)
    {
        max_health = new_max_health;
    }
    
    /**
     * Set the health bar's sprite to the image that corresponds to the current quotient health/max_health.
     */
    protected void draw() {
         int percentage = (int) (100*health/max_health);
         
         /* removeHitpoints() in Spaceship classes doesn't check if it goes beyond zero, because that would be
          * slow and annoying. So the health bar checks.
          */
         if (percentage < 0)
            percentage = 0;
         // don't check for percentage > 100 -- that way we notice programming errors in spaceship health code
         
         String side_string = "health";
         if (side == InvadersWorld.WHITE)
             side_string = "WhiteHealth";
         else if (side == InvadersWorld.BLACK)
             side_string = "BlackHealth";
         this.setImage(side_string+"/"+percentage+".png");
    }
}