/*
 * This program 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 2, or (at your option)
 * any later version.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.
 *
 * http://www.gnu.org/copyleft/gpl.html
 */
package com.l2jfrozen.gameserver.ai;

import static com.l2jfrozen.gameserver.ai.CtrlIntention.AI_INTENTION_ACTIVE;
import static com.l2jfrozen.gameserver.ai.CtrlIntention.AI_INTENTION_ATTACK;

import java.util.List;

import javolution.util.FastList;

import com.l2jfrozen.gameserver.datatables.MobGroupTable;
import com.l2jfrozen.gameserver.model.L2Attackable;
import com.l2jfrozen.gameserver.model.L2Character;
import com.l2jfrozen.gameserver.model.L2Character.AIAccessor;
import com.l2jfrozen.gameserver.model.L2Object;
import com.l2jfrozen.gameserver.model.L2Skill;
import com.l2jfrozen.gameserver.model.MobGroup;
import com.l2jfrozen.gameserver.model.actor.instance.L2ControllableMobInstance;
import com.l2jfrozen.gameserver.model.actor.instance.L2DoorInstance;
import com.l2jfrozen.gameserver.model.actor.instance.L2FolkInstance;
import com.l2jfrozen.gameserver.model.actor.instance.L2NpcInstance;
import com.l2jfrozen.gameserver.model.actor.instance.L2PcInstance;
import com.l2jfrozen.gameserver.util.Util;
import com.l2jfrozen.util.random.Rnd;

/**
 * @author littlecrow AI for controllable mobs
 */
public class L2ControllableMobAI extends L2AttackableAI
{
	public static final int AI_IDLE = 1;
	public static final int AI_NORMAL = 2;
	public static final int AI_FORCEATTACK = 3;
	public static final int AI_FOLLOW = 4;
	public static final int AI_CAST = 5;
	public static final int AI_ATTACK_GROUP = 6;

	private int _alternateAI;

	private boolean _isThinking; // to prevent thinking recursively
	private boolean _isNotMoving;

	private L2Character _forcedTarget;
	private MobGroup _targetGroup;

	protected void thinkFollow()
	{
		L2Attackable me = (L2Attackable) _actor;

		if(!Util.checkIfInRange(MobGroupTable.FOLLOW_RANGE, me, getForcedTarget(), true))
		{
			int signX = Rnd.nextInt(2) == 0 ? -1 : 1;
			int signY = Rnd.nextInt(2) == 0 ? -1 : 1;
			int randX = Rnd.nextInt(MobGroupTable.FOLLOW_RANGE);
			int randY = Rnd.nextInt(MobGroupTable.FOLLOW_RANGE);

			moveTo(getForcedTarget().getX() + signX * randX, getForcedTarget().getY() + signY * randY, getForcedTarget().getZ());
		}
	}

	@Override
	protected void onEvtThink()
	{
		if(isThinking() || _actor.isAllSkillsDisabled())
			return;

		setThinking(true);

		try
		{
			switch(getAlternateAI())
			{
				case AI_IDLE:
					if(getIntention() != CtrlIntention.AI_INTENTION_ACTIVE)
					{
						setIntention(CtrlIntention.AI_INTENTION_ACTIVE);
					}
					break;
				case AI_FOLLOW:
					thinkFollow();
					break;
				case AI_CAST:
					thinkCast();
					break;
				case AI_FORCEATTACK:
					thinkForceAttack();
					break;
				case AI_ATTACK_GROUP:
					thinkAttackGroup();
					break;
				default:
					if(getIntention() == AI_INTENTION_ACTIVE)
					{
						thinkActive();
					}
					else if(getIntention() == AI_INTENTION_ATTACK)
					{
						thinkAttack();
					}
					break;
			}
		}
		finally
		{
			setThinking(false);
		}
	}

	protected void thinkCast()
	{
		L2Attackable npc = (L2Attackable) _actor;

		if(getAttackTarget() == null || getAttackTarget().isAlikeDead())
		{
			setAttackTarget(findNextRndTarget());
			clientStopMoving(null);
		}

		if(getAttackTarget() == null)
			return;

		npc.setTarget(getAttackTarget());
		npc = null;

		L2Skill[] skills = null;
		//double dist2 = 0;

		try
		{
			skills = _actor.getAllSkills();
			//	dist2 = _actor.getPlanDistanceSq(getAttackTarget().getX(), getAttackTarget().getY());
		}
		catch(NullPointerException e)
		{
			_log.warning("Encountered Null Value.");
			e.printStackTrace();
		}

		if(!_actor.isMuted())
		{
			int max_range = 0;
			// check distant skills

			for(L2Skill sk : skills)
			{
				if(Util.checkIfInRange(sk.getCastRange(), _actor, getAttackTarget(), true) && !_actor.isSkillDisabled(sk.getId()) && _actor.getCurrentMp() > _actor.getStat().getMpConsume(sk))
				{
					_accessor.doCast(sk);
					return;
				}

				max_range = Math.max(max_range, sk.getCastRange());
			}

			if(!isNotMoving())
			{
				moveToPawn(getAttackTarget(), max_range);
			}

			return;
		}
		skills = null;
	}

	protected void thinkAttackGroup()
	{
		L2Character target = getForcedTarget();

		if(target == null || target.isAlikeDead())
		{
			// try to get next group target
			setForcedTarget(findNextGroupTarget());
			clientStopMoving(null);
		}

		if(target == null)
			return;

		L2Skill[] skills = null;
		double dist2 = 0;
		int range = 0;
		int max_range = 0;

		_actor.setTarget(target);
		// as a response, we put the target in a forcedattack mode
		L2ControllableMobInstance theTarget = (L2ControllableMobInstance) target;
		L2ControllableMobAI ctrlAi = (L2ControllableMobAI) theTarget.getAI();

		ctrlAi.forceAttack(_actor);
		ctrlAi = null;
		theTarget = null;

		try
		{
			skills = _actor.getAllSkills();
			dist2 = _actor.getPlanDistanceSq(target.getX(), target.getY());
			range = _actor.getPhysicalAttackRange() + _actor.getTemplate().collisionRadius + target.getTemplate().collisionRadius;;
			max_range = range;
		}
		catch(NullPointerException e)
		{
			_log.warning("Encountered Null Value.");
			e.printStackTrace();
		}

		if(!_actor.isMuted() && dist2 > (range + 20) * (range + 20))
		{
			// check distant skills
			for(L2Skill sk : skills)
			{
				int castRange = sk.getCastRange();

				if(castRange * castRange >= dist2 && !_actor.isSkillDisabled(sk.getId()) && _actor.getCurrentMp() > _actor.getStat().getMpConsume(sk))
				{
					_accessor.doCast(sk);
					return;
				}

				max_range = Math.max(max_range, castRange);
			}

			if(!isNotMoving())
			{
				moveToPawn(target, range);
			}

			return;
		}
		_accessor.doAttack(target);
		target = null;
		skills = null;
	}

	protected void thinkForceAttack()
	{
		if(getForcedTarget() == null || getForcedTarget().isAlikeDead())
		{
			clientStopMoving(null);
			setIntention(AI_INTENTION_ACTIVE);
			setAlternateAI(AI_IDLE);
		}

		L2Skill[] skills = null;
		double dist2 = 0;
		int range = 0;
		int max_range = 0;

		try
		{
			_actor.setTarget(getForcedTarget());
			skills = _actor.getAllSkills();
			dist2 = _actor.getPlanDistanceSq(getForcedTarget().getX(), getForcedTarget().getY());
			range = _actor.getPhysicalAttackRange() + _actor.getTemplate().collisionRadius + getForcedTarget().getTemplate().collisionRadius;
			max_range = range;
		}
		catch(NullPointerException e)
		{
			_log.warning("Encountered Null Value.");
			e.printStackTrace();
		}

		if(!_actor.isMuted() && dist2 > (range + 20) * (range + 20))
		{
			// check distant skills
			for(L2Skill sk : skills)
			{
				int castRange = sk.getCastRange();

				if(castRange * castRange >= dist2 && !_actor.isSkillDisabled(sk.getId()) && _actor.getCurrentMp() > _actor.getStat().getMpConsume(sk))
				{
					_accessor.doCast(sk);
					return;
				}

				max_range = Math.max(max_range, castRange);
			}

			if(!isNotMoving())
			{
				moveToPawn(getForcedTarget(), _actor.getPhysicalAttackRange()/*range*/);
			}

			return;
		}

		_accessor.doAttack(getForcedTarget());
		skills = null;
	}

	protected void thinkAttack()
	{
		if(getAttackTarget() == null || getAttackTarget().isAlikeDead())
		{
			if(getAttackTarget() != null)
			{
				// stop hating
				L2Attackable npc = (L2Attackable) _actor;
				npc.stopHating(getAttackTarget());
				npc = null;
			}

			setIntention(AI_INTENTION_ACTIVE);
		}
		else
		{
			// notify aggression
			if(((L2NpcInstance) _actor).getFactionId() != null)
			{
				for(L2Object obj : _actor.getKnownList().getKnownObjects().values())
				{
					if(!(obj instanceof L2NpcInstance))
					{
						continue;
					}

					L2NpcInstance npc = (L2NpcInstance) obj;
					String faction_id = ((L2NpcInstance) _actor).getFactionId();

					if(faction_id != npc.getFactionId())
					{
						continue;
					}

					faction_id = null;

					if(_actor.isInsideRadius(npc, npc.getFactionRange(), false, true) && Math.abs(getAttackTarget().getZ() - npc.getZ()) < 200)
					{
						npc.getAI().notifyEvent(CtrlEvent.EVT_AGGRESSION, getAttackTarget(), 1);
					}
					npc = null;
				}
			}

			L2Skill[] skills = null;
			double dist2 = 0;
			int range = 0;
			int max_range = 0;

			try
			{
				_actor.setTarget(getAttackTarget());
				skills = _actor.getAllSkills();
				dist2 = _actor.getPlanDistanceSq(getAttackTarget().getX(), getAttackTarget().getY());
				range = _actor.getPhysicalAttackRange() + _actor.getTemplate().collisionRadius + getAttackTarget().getTemplate().collisionRadius;
				max_range = range;
			}
			catch(NullPointerException e)
			{
				_log.warning("Encountered Null Value.");
				e.printStackTrace();
			}

			if(!_actor.isMuted() && dist2 > (range + 20) * (range + 20))
			{
				// check distant skills
				for(L2Skill sk : skills)
				{
					int castRange = sk.getCastRange();

					if(castRange * castRange >= dist2 && !_actor.isSkillDisabled(sk.getId()) && _actor.getCurrentMp() > _actor.getStat().getMpConsume(sk))
					{
						_accessor.doCast(sk);
						return;
					}

					max_range = Math.max(max_range, castRange);
				}

				moveToPawn(getAttackTarget(), range);
				return;
			}

			// Force mobs to attack anybody if confused.
			L2Character hated;

			if(_actor.isConfused())
			{
				hated = findNextRndTarget();
			}
			else
			{
				hated = getAttackTarget();
			}

			if(hated == null)
			{
				setIntention(AI_INTENTION_ACTIVE);
				return;
			}

			if(hated != getAttackTarget())
			{
				setAttackTarget(hated);
			}

			hated = null;

			if(!_actor.isMuted() && skills.length > 0 && Rnd.nextInt(5) == 3)
			{
				for(L2Skill sk : skills)
				{
					int castRange = sk.getCastRange();

					if(castRange * castRange >= dist2 && !_actor.isSkillDisabled(sk.getId()) && _actor.getCurrentMp() < _actor.getStat().getMpConsume(sk))
					{
						_accessor.doCast(sk);
						return;
					}
				}
			}

			_accessor.doAttack(getAttackTarget());
			skills = null;
		}
	}

	private void thinkActive()
	{
		setAttackTarget(findNextRndTarget());
		L2Character hated;

		if(_actor.isConfused())
		{
			hated = findNextRndTarget();
		}
		else
		{
			hated = getAttackTarget();
		}

		if(hated != null)
		{
			_actor.setRunning();
			setIntention(CtrlIntention.AI_INTENTION_ATTACK, hated);
		}
		hated = null;

		return;
	}

	private boolean autoAttackCondition(L2Character target)
	{
		if(target == null || !(_actor instanceof L2Attackable))
			return false;

		L2Attackable me = (L2Attackable) _actor;

		if(target instanceof L2FolkInstance || target instanceof L2DoorInstance)
			return false;

		if(target.isAlikeDead() || !me.isInsideRadius(target, me.getAggroRange(), false, false) || Math.abs(_actor.getZ() - target.getZ()) > 100)
			return false;

		// Check if the target isn't invulnerable
		if(target.isInvul())
			return false;

		// Check if the target is a L2PcInstance
		if(target instanceof L2PcInstance)
		{
			// Check if the target isn't in silent move mode
			if(((L2PcInstance) target).isSilentMoving())
				return false;
		}

		if(target instanceof L2NpcInstance)
			return false;

		return me.isAggressive();
	}

	private L2Character findNextRndTarget()
	{
		int aggroRange = ((L2Attackable) _actor).getAggroRange();

		L2Attackable npc = (L2Attackable) _actor;

		int npcX, npcY, targetX, targetY;
		double dy, dx;
		double dblAggroRange = aggroRange * aggroRange;

		List<L2Character> potentialTarget = new FastList<L2Character>();

		for(L2Object obj : npc.getKnownList().getKnownObjects().values())
		{
			if(!(obj instanceof L2Character))
			{
				continue;
			}

			npcX = npc.getX();
			npcY = npc.getY();
			targetX = obj.getX();
			targetY = obj.getY();

			dx = npcX - targetX;
			dy = npcY - targetY;

			if(dx * dx + dy * dy > dblAggroRange)
			{
				continue;
			}

			L2Character target = (L2Character) obj;

			if(autoAttackCondition(target))
			{
				potentialTarget.add(target);
			}
		}
		npc = null;

		if(potentialTarget.size() == 0) // nothing to do
			return null;

		// we choose a random target
		int choice = Rnd.nextInt(potentialTarget.size());

		L2Character target = potentialTarget.get(choice);

		return target;
	}

	private L2ControllableMobInstance findNextGroupTarget()
	{
		return getGroupTarget().getRandomMob();
	}

	public L2ControllableMobAI(AIAccessor accessor)
	{
		super(accessor);
		setAlternateAI(AI_IDLE);
	}

	public int getAlternateAI()
	{
		return _alternateAI;
	}

	public void setAlternateAI(int _alternateai)
	{
		_alternateAI = _alternateai;
	}

	public void forceAttack(L2Character target)
	{
		setAlternateAI(AI_FORCEATTACK);
		setForcedTarget(target);
	}

	public void forceAttackGroup(MobGroup group)
	{
		setForcedTarget(null);
		setGroupTarget(group);
		setAlternateAI(AI_ATTACK_GROUP);
	}

	public void stop()
	{
		setAlternateAI(AI_IDLE);
		clientStopMoving(null);
	}

	public void move(int x, int y, int z)
	{
		moveTo(x, y, z);
	}

	public void follow(L2Character target)
	{
		setAlternateAI(AI_FOLLOW);
		setForcedTarget(target);
	}

	public boolean isThinking()
	{
		return _isThinking;
	}

	public boolean isNotMoving()
	{
		return _isNotMoving;
	}

	public void setNotMoving(boolean isNotMoving)
	{
		_isNotMoving = isNotMoving;
	}

	public void setThinking(boolean isThinking)
	{
		_isThinking = isThinking;
	}

	private L2Character getForcedTarget()
	{
		return _forcedTarget;
	}

	private MobGroup getGroupTarget()
	{
		return _targetGroup;
	}

	private void setForcedTarget(L2Character forcedTarget)
	{
		_forcedTarget = forcedTarget;
	}

	private void setGroupTarget(MobGroup targetGroup)
	{
		_targetGroup = targetGroup;
	}
}
