content: /**
   * This file is part of Aion-Lightning <aion-lightning.org>.
   *
   *  Aion-Lightning is free software: you can redistribute it and/or modify
   *  it under the terms of the GNU General Public License as published by
   *  the Free Software Foundation, either version 3 of the License, or
   *  (at your option) any later version.
   *
   *  Aion-Lightning is distributed in the hope that it will be useful,
   *  but WITHOUT ANY WARRANTY; without even the implied warranty of
   *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *  GNU General Public License for more details. *
   *  You should have received a copy of the GNU General Public License
   *  along with Aion-Lightning.
   *  If not, see <http://www.gnu.org/licenses/>.
   */
  package ai.siege;
  
  import java.util.concurrent.Future;
  
  import com.aionemu.gameserver.ai2.AI2Actions;
  import com.aionemu.gameserver.ai2.AIName;
  import com.aionemu.gameserver.ai2.NpcAI2;
  import com.aionemu.gameserver.model.TaskId;
  import com.aionemu.gameserver.model.gameobjects.Creature;
  import com.aionemu.gameserver.model.gameobjects.player.Player;
  import com.aionemu.gameserver.utils.MathUtil;
  import com.aionemu.gameserver.utils.ThreadPoolManager;
  
  /**
   * @author cheatkiller
   */
  @AIName("guardtower")
  public class GuardTowerAI2 extends NpcAI2 {
  
  	private Future<?> task;
  
  	@Override
  	protected void handleSpawned() {
  		super.handleSpawned();
  		getOwner().getObjectTemplate().setAttackRange(30);
  	}
  
  	@Override
  	protected void handleCreatureSee(Creature creature) {
  		checkDistance(this, creature);
  	}
  
  	@Override
  	protected void handleCreatureNotSee(Creature creature) {
  		if (task != null) {
  			task = null;
  		}
  	}
  
  	@Override
  	protected void handleCreatureMoved(Creature creature) {
  		checkDistance(this, creature);
  	}
  
  	private void checkDistance(NpcAI2 ai, Creature creature) {
  		if (creature instanceof Player) {
  			if (task == null) {
  				if (MathUtil.isIn3dRange(this.getOwner(), creature, 30)) {
  					AI2Actions.targetCreature(this, creature);
  					attack();
  				}
  			}
  		}
  	}
  
  	private void cancelTask() {
  		if (task != null && !task.isCancelled()) {
  			task.cancel(true);
  		}
  	}
  
  	private void attack() {
  		final Player p = (Player) getOwner().getTarget();
  		task = ThreadPoolManager.getInstance().scheduleAtFixedRate(new Runnable() {
  
  			@Override
  			public void run() {
  				if (p == null || p.getLifeStats().isAlreadyDead()) {
  					cancelTask();
  				}
  				getOwner().getController().useSkill(getSkillList().getRandomSkill().getSkillId(), 55);
  			}
  		}, 1000, 8000);
  		getOwner().getController().addTask(TaskId.SKILL_USE, task);
  	}
  }
  