package com.aionemu.gameserver.spawnengine;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.aionemu.gameserver.dataholders.DataManager;
import com.aionemu.gameserver.model.gameobjects.Npc;
import com.aionemu.gameserver.model.templates.walker.WalkerTemplate;

/**
 * Forms the walker groups on initial spawn<br>
 * Brings NPCs back to their positions if they die<br>
 * Cleanup and rework will be made after tests and error handling<br>
 * To use only with patch!
 * 
 * @author vlog (based on Imaginary's imagination), Rolandas
 */
public class WalkerFormator {

	private static final Logger log = LoggerFactory.getLogger(WalkerFormator.class);

	/**
	 * If it's the instance first spawn, WalkerFormator verifies and creates groups; {@link #organizeAndSpawn()} must be called after to speed up
	 * spawning. If it's a respawn, nothing to verify, then the method places NPC to the first step and resets data to the saved, no organizing is
	 * needed.
	 * 
	 * @return <tt>true</tt> if npc was brought into world by the method call.
	 */
	public static boolean processClusteredNpc(Npc npc, int worldId, int instanceId) {
		String walkerId = npc.getSpawn().getWalkerId();
		if (walkerId != null) {
			WalkerTemplate template = DataManager.WALKER_DATA.getWalkerTemplate(walkerId);
			if (template == null) {
				log.warn("Missing walker ID: " + walkerId);
				return false;
			}
			if (template.getPool() < 2)
				return false;

			InstanceWalkerFormations formations = WalkerFormationsCache.getInstanceFormations(worldId, instanceId);
			WalkerGroup wg = formations.getSpawnWalkerGroup(walkerId);

			if (wg != null) {
				npc.setWalkerGroup(wg);
				wg.respawn(npc);
				return true;
			}

			return formations.cacheWalkerCandidate(new ClusteredNpc(npc, instanceId, template));
		}
		return false;
	}

	/**
	 * Organizes spawns in all processed walker groups. Must be called only when spawning all npcs for the instance of world.
	 */
	public static void organizeAndSpawn(int worldId, int instanceId) {
		InstanceWalkerFormations formations = WalkerFormationsCache.getInstanceFormations(worldId, instanceId);
		formations.organizeAndSpawn();
	}

	public static void changeWalkerGroup(int worldId, int instanceId, WalkerGroup walkerGroup) {
		InstanceWalkerFormations formations = WalkerFormationsCache.getInstanceFormations(worldId, instanceId);
		formations.changeCluster(walkerGroup);
	}

	public static void onInstanceDestroy(int worldId, int instanceId) {
		WalkerFormationsCache.onInstanceDestroy(worldId, instanceId);
	}

}