/*
 * 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 3 of the License, 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, see <http://www.gnu.org/licenses/>.
 */
package net.sf.l2j.gameserver.model.actor.knownlist;

import java.util.Collection;
import java.util.Map;

import javolution.util.FastMap;
import net.sf.l2j.gameserver.model.L2Character;
import net.sf.l2j.gameserver.model.L2Object;
import net.sf.l2j.gameserver.model.L2WorldRegion;
import net.sf.l2j.gameserver.model.actor.instance.L2BoatInstance;
import net.sf.l2j.gameserver.model.actor.instance.L2PcInstance;
import net.sf.l2j.gameserver.model.actor.instance.L2PlayableInstance;
import net.sf.l2j.gameserver.util.Util;

public class ObjectKnownList
{
    // =========================================================
    // Data Field
    private L2Object _activeObject;
    private Map<Integer, L2Object> _knownObjects;

    // =========================================================
    // Constructor
    public ObjectKnownList(L2Object activeObject)
    {
        _activeObject = activeObject;
    }

    // =========================================================
    // Method - Public
    public boolean addKnownObject(L2Object object) { return addKnownObject(object, null); }
    public boolean addKnownObject(L2Object object, L2Character dropper)
    {
        if (object == null) return false;
        
        // Instance -1 is for GMs that can see everything on all instances
        if(getActiveObject().getInstanceId() != -1 && (object.getInstanceId() != getActiveObject().getInstanceId()))
        	return false;

        // Check if the object is an L2PcInstance in ghost mode
        if(object instanceof L2PcInstance && ((L2PcInstance)object).getAppearance().isGhost())
        	return false;
 	 	
        // Check if already know object
        if (knowsObject(object))
            return false;

        // Check if object is not inside distance to watch object
        if (!Util.checkIfInShortRadius(getDistanceToWatchObject(object), getActiveObject(), object, true)) return false;

        return (getKnownObjects().put(object.getObjectId(), object) == null);
    }

    public final boolean knowsObject(L2Object object) { return getActiveObject() == object || getKnownObjects().containsKey(object.getObjectId()); }

    /** Remove all L2Object from _knownObjects */
    public void removeAllKnownObjects() { getKnownObjects().clear(); }

    public boolean removeKnownObject(L2Object object)
    {
    	if (object == null) return false;
    	return (getKnownObjects().remove(object.getObjectId()) != null);
    }

    // used only in Config.MOVE_BASED_KNOWNLIST and does not support guards seeing
    // moving monsters
    public final void findObjects()
    {
    	L2WorldRegion region = getActiveObject().getWorldRegion();
    	if (region == null) return;
    	
    	if (getActiveObject() instanceof L2PlayableInstance)
    	{
    		for (L2WorldRegion regi : region.getSurroundingRegions()) // offer members of this and surrounding regions
    		{
    			Collection<L2Object> vObj = regi.getVisibleObjects().values();
    	    	//synchronized (KnownListUpdateTaskManager.getInstance().getSync())
				{
					//synchronized (regi.getVisibleObjects())
					{
						for (L2Object _object : vObj)
						{
							if (_object != getActiveObject())
							{
								addKnownObject(_object);
								if (_object instanceof L2Character)
									_object.getKnownList().addKnownObject(getActiveObject());
							}
						}
					}
				}
    		}
    	}
    	else if (getActiveObject() instanceof L2Character)
    	{
    		for (L2WorldRegion regi : region.getSurroundingRegions()) // offer members of this and surrounding regions
    		{
    			if (regi.isActive()) {
    				Collection<L2PlayableInstance> vPls = regi.getVisiblePlayable().values();
    		    	//synchronized (KnownListUpdateTaskManager.getInstance().getSync())
					{
						//synchronized (regi.getVisiblePlayable())
						{
							for (L2Object _object : vPls)
								if (_object != getActiveObject())
									addKnownObject(_object);
						}
					}
    			}
    		}
    	}
    }
    
    // Remove invisible and too far L2Object from _knowObject and if necessary from _knownPlayers of the L2Character
    public void forgetObjects(boolean fullCheck)
    {
    	//synchronized (KnownListUpdateTaskManager.getInstance().getSync())
		{
			// Go through knownObjects
			Collection<L2Object> objs = getKnownObjects().values();
			//synchronized (getKnownObjects())
			{
				for (L2Object object : objs)
				{
					if (!fullCheck && !(object instanceof L2PlayableInstance))
						continue;
					
					// Remove all objects invisible or too far
					if (!object.isVisible()
					        || !Util.checkIfInShortRadius(getDistanceToForgetObject(object), getActiveObject(), object, true))
						if (object instanceof L2BoatInstance
						        && getActiveObject() instanceof L2PcInstance)
						{
							if (((L2BoatInstance) (object)).getVehicleDeparture() == null)
							{
								//
							}
							else if (((L2PcInstance) getActiveObject()).isInBoat())
							{
								if (((L2PcInstance) getActiveObject()).getBoat() != object)
								{
									removeKnownObject(object);
								}
							}
							else
							{
								removeKnownObject(object);
							}
						}
						else
						{
							removeKnownObject(object);
						}
				}
			}
		}
    }

    // =========================================================
    // Property - Public
    public L2Object getActiveObject()
    {
        return _activeObject;
    }

    public int getDistanceToForgetObject(L2Object object) { return 0; }

    public int getDistanceToWatchObject(L2Object object) { return 0; }

    /** Return the _knownObjects containing all L2Object known by the L2Character. */
    public final Map<Integer, L2Object> getKnownObjects()
    {
        if (_knownObjects == null) _knownObjects = new FastMap<Integer, L2Object>().setShared(true);
        return _knownObjects;
    }

}
