/*
 * 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;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.logging.Logger;

import javolution.util.FastList;
import javolution.util.FastMap;
import net.sf.l2j.Config;
import net.sf.l2j.gameserver.GmListTable;
import net.sf.l2j.gameserver.model.actor.instance.L2PcInstance;
import net.sf.l2j.gameserver.model.actor.instance.L2PetInstance;
import net.sf.l2j.gameserver.model.actor.instance.L2PlayableInstance;
import net.sf.l2j.util.Point3D;

/**
 * This class ...
 *
 * @version $Revision: 1.21.2.5.2.7 $ $Date: 2005/03/27 15:29:32 $
 */
public final class L2World
{
    private static Logger _log = Logger.getLogger(L2World.class.getName());

    /*
     * biteshift, defines number of regions
     * note, shifting by 15 will result in regions corresponding to map tiles
     * shifting by 12 divides one tile to 8x8 regions
     */
    public static final int SHIFT_BY = 12;

    /** Map dimensions */
    public static final int MAP_MIN_X = -163840;
    public static final int MAP_MAX_X = 229376;
    public static final int MAP_MIN_Y = -262144;
    public static final int MAP_MAX_Y = 294912;

    /** calculated offset used so top left region is 0,0 */
    public static final int OFFSET_X = Math.abs(MAP_MIN_X >> SHIFT_BY);
    public static final int OFFSET_Y = Math.abs(MAP_MIN_Y >> SHIFT_BY);

    /** number of regions */
    private static final int REGIONS_X = (MAP_MAX_X >> SHIFT_BY) + OFFSET_X;
    private static final int REGIONS_Y = (MAP_MAX_Y >> SHIFT_BY) + OFFSET_Y;


    //private FastMap<String, L2PcInstance> _allGms;

    /** HashMap(String Player name, L2PcInstance) containing all the players in game */
    private Map<String, L2PcInstance> _allPlayers;

    /** L2ObjectHashMap(L2Object) containing all visible objects */
    private Map<Integer,L2Object> _allObjects;

    /** List with the pets instances and their owner id */
    private Map<Integer,L2PetInstance> _petsInstance;

    private static final L2World _instance = new L2World();

    private L2WorldRegion[][] _worldRegions;

    /**
     * Constructor of L2World.<BR><BR>
     */
    private L2World()
    {
        //_allGms     = new FastMap<String, L2PcInstance>();
        _allPlayers   = new FastMap<String, L2PcInstance>().setShared(true);
        _petsInstance = new FastMap<Integer,L2PetInstance>().setShared(true);
        _allObjects   = new FastMap<Integer,L2Object>().setShared(true);

        initRegions();
    }


    /**
     * Return the current instance of L2World.<BR><BR>
     */
    public static L2World getInstance()
    {
        return _instance;
    }

    /**
     * Add L2Object object in _allObjects.<BR><BR>
     *
     * <B><U> Example of use </U> :</B><BR><BR>
     * <li> Withdraw an item from the warehouse, create an item</li>
     * <li> Spawn a L2Character (PC, NPC, Pet)</li><BR>
     */
    public void storeObject(L2Object object)
    {
    	if(_allObjects.get(object.getObjectId()) != null)
    	{
    		if (Config.DEBUG)
    			_log.warning("[L2World] objectId "+object.getObjectId()+" already exist in OID map!");
    		return;
    	}

        _allObjects.put(object.getObjectId(),object);
    }

    public long timeStoreObject(L2Object object)
    {
        long time   = System.currentTimeMillis();
        _allObjects.put(object.getObjectId(),object);
        time        -= System.currentTimeMillis();
        return time;
    }

    /**
     * Remove L2Object object from _allObjects of L2World.<BR><BR>
     *
     * <B><U> Example of use </U> :</B><BR><BR>
     * <li> Delete item from inventory, tranfer Item from inventory to warehouse</li>
     * <li> Crystallize item</li>
     * <li> Remove NPC/PC/Pet from the world</li><BR>
     *
     * @param object L2Object to remove from _allObjects of L2World
     *
     */
    public void removeObject(L2Object object)
    {
        _allObjects.remove(object.getObjectId());  // suggestion by whatev
        //IdFactory.getInstance().releaseId(object.getObjectId());
    }

    public void removeObjects(List<L2Object> list)
    {
        for(L2Object o : list)	_allObjects.remove(o.getObjectId());  // suggestion by whatev
        //IdFactory.getInstance().releaseId(object.getObjectId());
    }

    public void removeObjects(L2Object[] objects)
    {
        for(L2Object o : objects)	_allObjects.remove(o.getObjectId());  // suggestion by whatev
        //IdFactory.getInstance().releaseId(object.getObjectId());
    }

    public long timeRemoveObject(L2Object object)
    {
        long time   = System.currentTimeMillis();
        _allObjects.remove(object.getObjectId());
        time        -= System.currentTimeMillis();
        return time;
    }

    /**
     * Return the L2Object object that belongs to an ID or null if no object found.<BR><BR>
     *
     * <B><U> Example of use </U> :</B><BR><BR>
     * <li> Client packets : Action, AttackRequest, RequestJoinParty, RequestJoinPledge...</li><BR>
     *
     * @param oID Identifier of the L2Object
     */
    public L2Object findObject(int oID)
    {
        return _allObjects.get(oID);
    }

    public long timeFindObject(int objectID)
    {
        long time   = System.currentTimeMillis();
        _allObjects.get(objectID);
        time        -= System.currentTimeMillis();
        return time;
    }
    
    /**
     * Added by Tempy - 08 Aug 05
     * Allows easy retrevial of all visible objects in world.
     * 
     * -- do not use that fucntion, its unsafe!
     * 
     * @deprecated 
     */
    @Deprecated
    public final Map<Integer,L2Object> getAllVisibleObjects()
    {
        return _allObjects;
    }
    

    /**
     * Get the count of all visible objects in world.<br><br>
     * 
     * @return count off all L2World objects
     */
    public final int getAllVisibleObjectsCount()
    {
        return _allObjects.size();
    }
    
    /**
     * Return a table containing all GMs.<BR><BR>
     * 
     */
    public FastList<L2PcInstance> getAllGMs()
    {
        return GmListTable.getInstance().getAllGms(true);
    }
    
    public Map<String,L2PcInstance> getAllPlayers()
    {
        return _allPlayers;
    }

    /**
     * Return how many players are online.<BR><BR>
     *
     * @return number of online players.
     */
    public int getAllPlayersCount()
    {
        return _allPlayers.size();
    }

    /**
     * Return the player instance corresponding to the given name.<BR><BR>
     *
     * @param name Name of the player to get Instance
     */
    public L2PcInstance getPlayer(String name)
    {
        return _allPlayers.get(name.toLowerCase());
    }

    /**
     * Return the pet instance from the given ownerId.<BR><BR>
     *
     * @param ownerId ID of the owner
     */
    public L2PetInstance getPet(int ownerId)
    {
        return _petsInstance.get(new Integer(ownerId));
    }

    /**
     * Add the given pet instance from the given ownerId.<BR><BR>
     *
     * @param ownerId ID of the owner
     * @param pet L2PetInstance of the pet
     */
    public L2PetInstance addPet(int ownerId, L2PetInstance pet)
    {
        return _petsInstance.put(ownerId, pet);
    }

    /**
     * Remove the given pet instance.<BR><BR>
     *
     * @param ownerId ID of the owner
     */
    public void removePet(int ownerId)
    {
        _petsInstance.remove(ownerId);
    }
    /**
     * Remove the given pet instance.<BR><BR>
     *
     * @param pet the pet to remove
     */
    public void removePet(L2PetInstance pet)
    {
        _petsInstance.remove(pet.getOwner().getObjectId());
    }


    /**
     * Add a L2Object in the world.<BR><BR>
     *
     * <B><U> Concept</U> :</B><BR><BR>
     * L2Object (including L2PcInstance) are identified in <B>_visibleObjects</B> of his current L2WorldRegion and in <B>_knownObjects</B> of other surrounding L2Characters <BR>
     * L2PcInstance are identified in <B>_allPlayers</B> of L2World, in <B>_allPlayers</B> of his current L2WorldRegion and in <B>_knownPlayer</B> of other surrounding L2Characters <BR><BR>
     *
     * <B><U> Actions</U> :</B><BR><BR>
     * <li>Add the L2Object object in _allPlayers* of L2World </li>
     * <li>Add the L2Object object in _gmList** of GmListTable </li>
     * <li>Add object in _knownObjects and _knownPlayer* of all surrounding L2WorldRegion L2Characters </li><BR>
     *
     * <li>If object is a L2Character, add all surrounding L2Object in its _knownObjects and all surrounding L2PcInstance in its _knownPlayer </li><BR>
     *
     * <I>*  only if object is a L2PcInstance</I><BR>
     * <I>** only if object is a GM L2PcInstance</I><BR><BR>
     *
     * <FONT COLOR=#FF0000><B> <U>Caution</U> : This method DOESN'T ADD the object in _visibleObjects and _allPlayers* of L2WorldRegion (need synchronisation)</B></FONT><BR>
     * <FONT COLOR=#FF0000><B> <U>Caution</U> : This method DOESN'T ADD the object to _allObjects and _allPlayers* of L2World (need synchronisation)</B></FONT><BR><BR>
     *
     * <B><U> Example of use </U> :</B><BR><BR>
     * <li> Drop an Item </li>
     * <li> Spawn a L2Character</li>
     * <li> Apply Death Penalty of a L2PcInstance </li><BR><BR>
     *
     * @param object L2object to add in the world
     * @param newregion L2WorldRegion in wich the object will be add (not used)
     * @param dropper L2Character who has dropped the object (if necessary)
     *
     */
    public void addVisibleObject(L2Object object, L2WorldRegion newRegion, L2Character dropper)
    {
        // If selected L2Object is a L2PcIntance, add it in L2ObjectHashSet(L2PcInstance) _allPlayers of L2World
    	// XXX TODO: this code should be obsoleted by protection in putObject func...
        if (object instanceof L2PcInstance)
        {
            L2PcInstance player = (L2PcInstance) object;

            if (!player.isTeleporting())
            {
            	L2PcInstance tmp = _allPlayers.get(player.getName().toLowerCase());
            	if (tmp != null)
            	{
            		_log.warning("Duplicate character!? Closing both characters ("+player.getName()+")");
            		player.closeNetConnection();
            		tmp.closeNetConnection();
            		return;
            	}
            	_allPlayers.put(player.getName().toLowerCase(), player);
            }
        }
        
        if (!newRegion.isActive()) 
        	return;
        // Get all visible objects contained in the _visibleObjects of L2WorldRegions
        // in a circular area of 2000 units
        List<L2Object> visibles = getVisibleObjects(object, 2000);
        if (Config.DEBUG) _log.finest("objects in range:"+visibles.size());

        // tell the player about the surroundings
        // Go through the visible objects contained in the circular area
        for (L2Object visible : visibles)
        {
            // Add the object in L2ObjectHashSet(L2Object) _knownObjects of the visible L2Character according to conditions :
            //   - L2Character is visible
            //   - object is not already known
            //   - object is in the watch distance
            // If L2Object is a L2PcInstance, add L2Object in L2ObjectHashSet(L2PcInstance) _knownPlayer of the visible L2Character
            visible.getKnownList().addKnownObject(object, dropper);

            // Add the visible L2Object in L2ObjectHashSet(L2Object) _knownObjects of the object according to conditions
            // If visible L2Object is a L2PcInstance, add visible L2Object in L2ObjectHashSet(L2PcInstance) _knownPlayer of the object
            object.getKnownList().addKnownObject(visible, dropper);
        }
    }

    /**
     * Add the L2PcInstance to _allPlayers of L2World.<BR><BR>
     *  
     */
    public void addToAllPlayers(L2PcInstance cha)
    {
        _allPlayers.put(cha.getName().toLowerCase(), cha);
    }

    /**
     * Remove the L2PcInstance from _allPlayers of L2World.<BR><BR>
     *
     * <B><U> Example of use </U> :</B><BR><BR>
     * <li> Remove a player fom the visible objects </li><BR>
     *
     */
    public void removeFromAllPlayers(L2PcInstance cha)
    {
        _allPlayers.remove(cha.getName().toLowerCase());
    }

    /**
     * Remove a L2Object from the world.<BR><BR>
     *
     * <B><U> Concept</U> :</B><BR><BR>
     * L2Object (including L2PcInstance) are identified in <B>_visibleObjects</B> of his current L2WorldRegion and in <B>_knownObjects</B> of other surrounding L2Characters <BR>
     * L2PcInstance are identified in <B>_allPlayers</B> of L2World, in <B>_allPlayers</B> of his current L2WorldRegion and in <B>_knownPlayer</B> of other surrounding L2Characters <BR><BR>
     *
     * <B><U> Actions</U> :</B><BR><BR>
     * <li>Remove the L2Object object from _allPlayers* of L2World </li>
     * <li>Remove the L2Object object from _visibleObjects and _allPlayers* of L2WorldRegion </li>
     * <li>Remove the L2Object object from _gmList** of GmListTable </li>
     * <li>Remove object from _knownObjects and _knownPlayer* of all surrounding L2WorldRegion L2Characters </li><BR>
     *
     * <li>If object is a L2Character, remove all L2Object from its _knownObjects and all L2PcInstance from its _knownPlayer </li><BR><BR>
     *
     * <FONT COLOR=#FF0000><B> <U>Caution</U> : This method DOESN'T REMOVE the object from _allObjects of L2World</B></FONT><BR><BR>
     *
     * <I>*  only if object is a L2PcInstance</I><BR>
     * <I>** only if object is a GM L2PcInstance</I><BR><BR>
     *
     * <B><U> Example of use </U> :</B><BR><BR>
     * <li> Pickup an Item </li>
     * <li> Decay a L2Character</li><BR><BR>
     *
     * @param object L2object to remove from the world
     * @param oldregion L2WorldRegion in wich the object was before removing
     *
     */
    public void removeVisibleObject(L2Object object, L2WorldRegion oldRegion)
    {
        if (object == null)
            return;

        //removeObject(object);

        if (oldRegion != null)
        {
            // Remove the object from the L2ObjectHashSet(L2Object) _visibleObjects of L2WorldRegion
            // If object is a L2PcInstance, remove it from the L2ObjectHashSet(L2PcInstance) _allPlayers of this L2WorldRegion
            oldRegion.removeVisibleObject(object);

            
            // Go through all surrounding L2WorldRegion L2Characters
            for (L2WorldRegion reg : oldRegion.getSurroundingRegions()) 
            {
            	//synchronized (KnownListUpdateTaskManager.getInstance().getSync())
				{
					Collection<L2Object> vObj = reg.getVisibleObjects().values();
					//synchronized (reg.getVisibleObjects())
					{
						for (L2Object obj : vObj)
						{
							if (obj.getKnownList() != null)
								obj.getKnownList().removeKnownObject(object);
							if (object.getKnownList() != null)
								object.getKnownList().removeKnownObject(obj);
						}
					}
				}
            }
            
            // If object is a L2Character :
            // Remove all L2Object from L2ObjectHashSet(L2Object) containing all L2Object detected by the L2Character
            // Remove all L2PcInstance from L2ObjectHashSet(L2PcInstance) containing all player ingame detected by the L2Character
            object.getKnownList().removeAllKnownObjects();


            // If selected L2Object is a L2PcIntance, remove it from L2ObjectHashSet(L2PcInstance) _allPlayers of L2World
            if (object instanceof L2PcInstance)
            {
                if (!((L2PcInstance)object).isTeleporting())
                	removeFromAllPlayers((L2PcInstance)object);

                // If selected L2Object is a GM L2PcInstance, remove it from Set(L2PcInstance) _gmList of GmListTable
                //if (((L2PcInstance)object).isGM())
                    //GmListTable.getInstance().deleteGm((L2PcInstance)object);
            }

        }
    }


    /**
     * Return all visible objects of the L2WorldRegion object's and of its surrounding L2WorldRegion.<BR><BR>
     *
     * <B><U> Concept</U> :</B><BR><BR>
     * All visible object are identified in <B>_visibleObjects</B> of their current L2WorldRegion <BR>
     * All surrounding L2WorldRegion are identified in <B>_surroundingRegions</B> of the selected L2WorldRegion in order to scan a large area around a L2Object<BR><BR>
     *
     * <B><U> Example of use </U> :</B><BR><BR>
     * <li> Find Close Objects for L2Character </li><BR>
     *
     * @param object L2object that determine the current L2WorldRegion
     *
     */
    public List<L2Object> getVisibleObjects(L2Object object)
    {
        L2WorldRegion reg = object.getWorldRegion();

        if (reg == null)
            return null;

        // Create an FastList in order to contain all visible L2Object
        List<L2Object> result = new ArrayList<L2Object>();

        // Go through the FastList of region
        for (L2WorldRegion regi : reg.getSurroundingRegions())
        {
        	// Go through visible objects of the selected region
        	Collection<L2Object> vObj = regi.getVisibleObjects().values();
        	//synchronized (regi.getVisibleObjects())
        	{
        		for (L2Object _object : vObj)
        		{
        			if (_object.equals(object))
        				continue;   // skip our own character
        			if (!_object.isVisible())
        				continue;   // skip dying objects
        			result.add(_object);
        		}
        	}
        }

        return result;
    }


    /**
     * Return all visible objects of the L2WorldRegions in the circular area (radius) centered on the object.<BR><BR>
     *
     * <B><U> Concept</U> :</B><BR><BR>
     * All visible object are identified in <B>_visibleObjects</B> of their current L2WorldRegion <BR>
     * All surrounding L2WorldRegion are identified in <B>_surroundingRegions</B> of the selected L2WorldRegion in order to scan a large area around a L2Object<BR><BR>
     *
     * <B><U> Example of use </U> :</B><BR><BR>
     * <li> Define the aggrolist of monster </li>
     * <li> Define visible objects of a L2Object </li>
     * <li> Skill : Confusion... </li><BR>
     *
     * @param object L2object that determine the center of the circular area
     * @param radius Radius of the circular area
     *
     */
    public List<L2Object> getVisibleObjects(L2Object object, int radius)
    {
        if (object == null || !object.isVisible())
            return new ArrayList<L2Object>();

        int x = object.getX();
        int y = object.getY();
        int sqRadius = radius*radius;

        // Create an FastList in order to contain all visible L2Object
        List<L2Object> result = new ArrayList<L2Object>();

        // Go through the FastList of region
        for (L2WorldRegion regi : object.getWorldRegion().getSurroundingRegions()) 
        {
            // Go through visible objects of the selected region
        	Collection<L2Object> vObj = regi.getVisibleObjects().values();
        	//synchronized (regi.getVisibleObjects())
        	{
        		for (L2Object _object : vObj)
        		{
        			if (_object.equals(object)) continue;   // skip our own character

        			int x1 = _object.getX();
        			int y1 = _object.getY();

        			double dx = x1 - x;
        			double dy = y1 - y;

        			if (dx*dx + dy*dy < sqRadius)
        				result.add(_object);
        		}
        	}
        }

        return result;
    }


    /**
     * Return all visible objects of the L2WorldRegions in the spheric area (radius) centered on the object.<BR><BR>
     *
     * <B><U> Concept</U> :</B><BR><BR>
     * All visible object are identified in <B>_visibleObjects</B> of their current L2WorldRegion <BR>
     * All surrounding L2WorldRegion are identified in <B>_surroundingRegions</B> of the selected L2WorldRegion in order to scan a large area around a L2Object<BR><BR>
     *
     * <B><U> Example of use </U> :</B><BR><BR>
     * <li> Define the target list of a skill </li>
     * <li> Define the target list of a polearme attack </li><BR><BR>
     *
     * @param object L2object that determine the center of the circular area
     * @param radius Radius of the spheric area
     *
     */
    public List<L2Object> getVisibleObjects3D(L2Object object, int radius)
    {
        if (object == null || !object.isVisible())
            return new ArrayList<L2Object>();

        int x = object.getX();
        int y = object.getY();
        int z = object.getZ();
        int sqRadius = radius*radius;

        // Create an FastList in order to contain all visible L2Object
        List<L2Object> result = new ArrayList<L2Object>();


        // Go through visible object of the selected region
        for (L2WorldRegion regi : object.getWorldRegion().getSurroundingRegions())
        {
        	Collection<L2Object> vObj = regi.getVisibleObjects().values();
        	//synchronized (regi.getVisibleObjects())
        	{
        		for (L2Object _object : vObj)
        		{
        			if (_object.equals(object)) continue;   // skip our own character

        			int x1 = _object.getX();
        			int y1 = _object.getY();
        			int z1 = _object.getZ();

        			long dx = x1 - x;
        			long dy = y1 - y;
        			long dz = z1 - z;

        			if (dx*dx + dy*dy + dz*dz < sqRadius)
        				result.add(_object);
        		}
        	}
        }

        return result;
    }

    /**
     * Return all visible players of the L2WorldRegion object's and of its surrounding L2WorldRegion.<BR><BR>
     *
     * <B><U> Concept</U> :</B><BR><BR>
     * All visible object are identified in <B>_visibleObjects</B> of their current L2WorldRegion <BR>
     * All surrounding L2WorldRegion are identified in <B>_surroundingRegions</B> of the selected L2WorldRegion in order to scan a large area around a L2Object<BR><BR>
     *
     * <B><U> Example of use </U> :</B><BR><BR>
     * <li> Find Close Objects for L2Character </li><BR>
     *
     * @param object L2object that determine the current L2WorldRegion
     *
     */
    public List<L2PlayableInstance> getVisiblePlayable(L2Object object)
    {
        L2WorldRegion reg = object.getWorldRegion();

        if (reg == null)
            return null;

        // Create an FastList in order to contain all visible L2Object
        List<L2PlayableInstance> result = new ArrayList<L2PlayableInstance>();

        // Go through the FastList of region
        for (L2WorldRegion regi : reg.getSurroundingRegions())
        {
            // Create an Iterator to go through the visible L2Object of the L2WorldRegion
        	Map<Integer,L2PlayableInstance> _allpls = regi.getVisiblePlayable();
        	Collection<L2PlayableInstance> _playables = _allpls.values();
            // Go through visible object of the selected region
        	//synchronized (_allpls)
        	{
        		for (L2PlayableInstance _object: _playables)
        		{
        			if (_object.equals(object))
        				continue;   // skip our own character

        			if (!_object.isVisible()) // GM invisible is different than this...
        				continue;   // skip dying objects

        			result.add(_object);
        		}
        	}
        }

        return result;
    }


    /**
     * Calculate the current L2WorldRegions of the object according to its position (x,y).<BR><BR>
     *
     * <B><U> Example of use </U> :</B><BR><BR>
     * <li> Set position of a new L2Object (drop, spawn...) </li>
     * <li> Update position of a L2Object after a mouvement </li><BR>
     *
     * @param Point3D point position of the object
     */
    public L2WorldRegion getRegion(Point3D point)
    {
        return _worldRegions[(point.getX() >> SHIFT_BY) + OFFSET_X][(point.getY() >> SHIFT_BY) + OFFSET_Y];
    }

    public L2WorldRegion getRegion(int x, int y)
    {
        return _worldRegions[(x >> SHIFT_BY) + OFFSET_X][(y >> SHIFT_BY) + OFFSET_Y];
    }

    /**
     * Returns the whole 2d array containing the world regions
     * used by ZoneData.java to setup zones inside the world regions
     * @return
     */
    public L2WorldRegion[][] getAllWorldRegions()
    {
    	return _worldRegions;
    }

    /**
     * Check if the current L2WorldRegions of the object is valid according to its position (x,y).<BR><BR>
     *
     * <B><U> Example of use </U> :</B><BR><BR>
     * <li> Init L2WorldRegions </li><BR>
     *
     * @param x X position of the object
     * @param y Y position of the object
     *
     * @return True if the L2WorldRegion is valid
     */
    private boolean validRegion(int x, int y)
    {
        return (x >= 0 && x <= REGIONS_X && y >= 0 && y <= REGIONS_Y);
    }

    /**
     * Init each L2WorldRegion and their surrounding table.<BR><BR>
     *
     * <B><U> Concept</U> :</B><BR><BR>
     * All surrounding L2WorldRegion are identified in <B>_surroundingRegions</B> of the selected L2WorldRegion in order to scan a large area around a L2Object<BR><BR>
     *
     * <B><U> Example of use </U> :</B><BR><BR>
     * <li> Constructor of L2World </li><BR>
     *
     */
    private void initRegions()
    {
        _log.config("L2World: Setting up World Regions");

        _worldRegions = new L2WorldRegion[REGIONS_X+1][REGIONS_Y+1];

        for (int i = 0; i <= REGIONS_X; i++)
        {
            for (int j = 0; j <= REGIONS_Y; j++)
            {
                _worldRegions[i][j] = new L2WorldRegion(i, j);
            }
        }

        for (int x=0; x <= REGIONS_X; x++)
        {
            for (int y=0; y <= REGIONS_Y; y++)
            {
                for (int a = -1; a <= 1; a++)
                {
                    for (int b = -1; b <= 1; b++)
                    {
                        if (validRegion(x + a, y + b))
                        {
                            _worldRegions[x + a][y + b].addSurroundingRegion(_worldRegions[x][y]);
                        }
                    }
                }
            }
        }

        _log.config("L2World: ("+REGIONS_X+" by "+REGIONS_Y+") World Region Grid set up.");

    }

    /**
     * Deleted all spawns in the world.
     */
    public void deleteVisibleNpcSpawns()
    {
        _log.info("Deleting all visible NPC's.");
        for (int i = 0; i <= REGIONS_X; i++)
        {
            for (int j = 0; j <= REGIONS_Y; j++)
            {
                _worldRegions[i][j].deleteVisibleNpcSpawns();
            }
        }
        _log.info("All visible NPC's deleted.");
    }
}
