package nl.tudelft.pogamut.ut2004.agent.module.shooting.weapon;
   
   import nl.tudelft.pogamut.ut2004.agent.module.shooting.AbstractWeaponShooting;
   import nl.tudelft.pogamut.ut2004.agent.module.shooting.util.FacingUtil;
   
   import cz.cuni.amis.pogamut.base3d.worldview.object.ILocated;
   import cz.cuni.amis.pogamut.ut2004.agent.module.sensomotoric.Weaponry;
   import cz.cuni.amis.pogamut.ut2004.agent.module.sensor.AgentInfo;
   import cz.cuni.amis.pogamut.ut2004.agent.module.sensor.WeaponPref;
  import cz.cuni.amis.pogamut.ut2004.agent.module.sensor.WeaponPrefs;
  import cz.cuni.amis.pogamut.ut2004.bot.command.ImprovedShooting;
  import cz.cuni.amis.pogamut.ut2004.bot.impl.UT2004Bot;
  import cz.cuni.amis.pogamut.ut2004.communication.messages.ItemType;
  import cz.cuni.amis.pogamut.ut2004.communication.messages.gbinfomessages.Player;
  
  /**
   * <p>
   * Module to work efficiently with the flak cannon.
   * </p>
   * 
   * <p>
   * To avoid self damage the module won't use the secondary fire mode when it
   * might blow up in it's face and won't be able to survive the damage. Instead
   * secondary mode will be used. The effectiveness of this is somewhat limited as
   * flak cannon projectiles bounce around.
   * 
   * Consider using {@link WeaponPrefs} to ban the flak cannon on close range.
   * <p>
   * 
   * @author mpkorstanje
   * 
   */
  public class FlakCannonShooting extends AbstractWeaponShooting {
  
  	protected static final WeaponPref FLAK_CANNON_PRIMARY = new WeaponPref(ItemType.FLAK_CANNON, true);
  
  	protected static final double FLAK_CANON_SECONDARY_PROJECTILE_SPLASH_RADIUS = 400;
  
  	protected static final int FLAK_CANON_SECONDARY_PROJECTILE_DAMAGE = 75;
  
  	public FlakCannonShooting(UT2004Bot<?, ?, ?> agent, AgentInfo info, ImprovedShooting shoot, Weaponry weaponry) {
  		super(agent, info, shoot, weaponry);
  	}
  
  	@Override
  	protected void shoot() {
  
  		// Wrong weapon, wait up.
  		if (!isWeaponReady()) {
  			return;
  		}
  		
  		//No target, no shoot.
  		if(!hasTarget()){
  			shoot.stopShooting();
  			return;
  		}
  
  		boolean facing = FacingUtil.isFacing2D(info, target, FACING_ANGLE);
  		boolean safeToShoot = isSafeToShoot(target);
  
  		if (!(target instanceof Player)) {
  			shootLocation(facing, safeToShoot);
  			return;
  		}
  
  		Player player = (Player) target;
  
  		// Target not visible, hold fire.
  		if (!player.isVisible()) {
  			shoot.stopShooting();
  			return;
  		}
  
  		// Shoot if we are facing the right way.
  		// Don't want to blow an orb on a wall.
  		if (facing && safeToShoot) {
  			shoot.shoot(weaponPref, player);
  		}
  		// Player will absorb damage. So fall back to primary.
  		else if (facing) {
  			shoot.shootPrimary(player);
  		} else {
  			shoot.stopShooting();
  		}
  	}
  
  	private void shootLocation(boolean facing, boolean safeToShoot) {
  		if (facing && safeToShoot) {
  			shoot.shoot(weaponPref, target);
  		}
  		// Don't alternate to primary when note safe to shoot. Primary only gets
  		// absorbed by players.
  		else {
  			shoot.stopShooting();
  		}
  	}
  
  	/**
 	 * Don't shoot unless we are far away enough to avoid damaging ourselves, or
 	 * healthy enough to survive the damage.
 	 * 
 	 * @param target
 	 *            to shoot
 	 * @return true iff we won't kill ourselves.
 	 */
 	protected boolean isSafeToShoot(ILocated target) {
 		double distance = info.getLocation().getDistance(target.getLocation());
 		boolean safeDistance = distance > FLAK_CANON_SECONDARY_PROJECTILE_SPLASH_RADIUS;
 		boolean healty = info.getHealth() > FLAK_CANON_SECONDARY_PROJECTILE_DAMAGE;
 
 		return (safeDistance || healty);
 	}
 
 	@Override
 	protected WeaponPref getDefaultWeaponPref() {
 		return FLAK_CANNON_PRIMARY;
 	}
 
 
 }