/*
 * 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 com.l2jserver.gameserver.model;

import java.util.List;
import java.util.NoSuchElementException;

import javolution.util.FastList;

import com.l2jserver.Config;
import com.l2jserver.gameserver.GameTimeController;
import com.l2jserver.gameserver.SevenSignsFestival;
import com.l2jserver.gameserver.datatables.ItemTable;
import com.l2jserver.gameserver.datatables.SkillTable;
import com.l2jserver.gameserver.instancemanager.DuelManager;
import com.l2jserver.gameserver.model.actor.L2Attackable;
import com.l2jserver.gameserver.model.actor.L2Character;
import com.l2jserver.gameserver.model.actor.L2Playable;
import com.l2jserver.gameserver.model.actor.L2Summon;
import com.l2jserver.gameserver.model.actor.instance.L2PcInstance;
import com.l2jserver.gameserver.model.actor.instance.L2PetInstance;
import com.l2jserver.gameserver.model.actor.instance.L2SummonInstance;
import com.l2jserver.gameserver.model.entity.DimensionalRift;
import com.l2jserver.gameserver.network.SystemMessageId;
import com.l2jserver.gameserver.network.serverpackets.CreatureSay;
import com.l2jserver.gameserver.network.serverpackets.ExCloseMPCC;
import com.l2jserver.gameserver.network.serverpackets.ExOpenMPCC;
import com.l2jserver.gameserver.network.serverpackets.ExPartyPetWindowAdd;
import com.l2jserver.gameserver.network.serverpackets.ExPartyPetWindowDelete;
import com.l2jserver.gameserver.network.serverpackets.L2GameServerPacket;
import com.l2jserver.gameserver.network.serverpackets.PartyMemberPosition;
import com.l2jserver.gameserver.network.serverpackets.PartySmallWindowAdd;
import com.l2jserver.gameserver.network.serverpackets.PartySmallWindowAll;
import com.l2jserver.gameserver.network.serverpackets.PartySmallWindowDelete;
import com.l2jserver.gameserver.network.serverpackets.PartySmallWindowDeleteAll;
import com.l2jserver.gameserver.network.serverpackets.SystemMessage;
import com.l2jserver.gameserver.skills.Stats;
import com.l2jserver.gameserver.util.Util;
import com.l2jserver.util.Rnd;

/**
 * This class ...
 *
 * @author nuocnam
 * @version $Revision: 1.6.2.2.2.6 $ $Date: 2005/04/11 19:12:16 $
 */
public class L2Party {
	private static final double[] BONUS_EXP_SP = {1, 1.30, 1.39, 1.50, 1.54, 1.58, 1.63, 1.67, 1.71};

	//private static Logger _log = Logger.getLogger(L2Party.class.getName());

	private final FastList<L2PcInstance> _members;
	private boolean _pendingInvitation = false;
	private long _pendingInviteTimeout;
	private int _partyLvl = 0;
	private int _itemDistribution = 0;
	private int _itemLastLoot = 0;
	private L2CommandChannel _commandChannel = null;

	private DimensionalRift _dr;

	public static final int ITEM_LOOTER = 0;
	public static final int ITEM_RANDOM = 1;
	public static final int ITEM_RANDOM_SPOIL = 2;
	public static final int ITEM_ORDER = 3;
	public static final int ITEM_ORDER_SPOIL = 4;

	/**
	 * constructor ensures party has always one member - leader
	 * @param leader
	 * @param itemDistributionMode
	 */
	public L2Party(L2PcInstance leader, int itemDistribution)
	{
		_members = new FastList<L2PcInstance>();
		_itemDistribution = itemDistribution;
		getPartyMembers().add(leader);
		_partyLvl = leader.getLevel();
	}

	/**
	 * returns number of party members
	 * @return
	 */
	public int getMemberCount() { return getPartyMembers().size(); }
	
	/**
	 * Check if another player can start invitation process
	 * @return boolean if party waits for invitation respond
	 */
	public boolean getPendingInvitation() { return _pendingInvitation; }
	
	/**
	 * set invitation process flag and store time for expiration
	 * happens when: player join party or player decline to join
	 */
	public void setPendingInvitation(boolean val) 
	{ 
		_pendingInvitation = val;
		_pendingInviteTimeout = GameTimeController.getGameTicks() + L2PcInstance.REQUEST_TIMEOUT * GameTimeController.TICKS_PER_SECOND;
	}
	
	/**
	 * Check if player invitation is expired
	 * @return boolean if time is expired
	 * @see com.l2jserver.gameserver.model.actor.instance.L2PcInstance#isRequestExpired()
	 */
	public boolean isInvitationRequestExpired()
	{
		return !(_pendingInviteTimeout > GameTimeController.getGameTicks());
	}

	/**
	 * returns all party members
	 * @return
	 */
	public final FastList<L2PcInstance> getPartyMembers()
	{
		return _members;
	}

	/**
	 * get random member from party
	 * @return
	 */
	private L2PcInstance getCheckedRandomMember(int ItemId, L2Character target)
	{
		List<L2PcInstance> availableMembers = new FastList<L2PcInstance>();
		for (L2PcInstance member : getPartyMembers())
		{
			if (member.getInventory().validateCapacityByItemId(ItemId) &&
                    Util.checkIfInRange(Config.ALT_PARTY_RANGE2, target, member, true)) availableMembers.add(member);
		}
		if (!availableMembers.isEmpty()) return availableMembers.get(Rnd.get(availableMembers.size()));
		else return null;
	}

	/**
	 * get next item looter
	 * @return
	 */
	private L2PcInstance getCheckedNextLooter(int ItemId, L2Character target)
	{
		for (int i = 0; i < getMemberCount(); i++)
		{
			if (++_itemLastLoot >= getMemberCount()) _itemLastLoot = 0;
			L2PcInstance member;
			try
			{
				member = getPartyMembers().get(_itemLastLoot);
				if (member.getInventory().validateCapacityByItemId(ItemId) &&
						Util.checkIfInRange(Config.ALT_PARTY_RANGE2, target, member, true))
					return member;
			}
			catch (Exception e)
			{
				// continue, take another member if this just logged off
			}
		}

		return null;
	}

	/**
	 * get next item looter
	 * @return
	 */
	private L2PcInstance getActualLooter(L2PcInstance player, int ItemId, boolean spoil, L2Character target)
	{
		L2PcInstance looter = player;

        switch (_itemDistribution)
        {
            case ITEM_RANDOM:
                if (!spoil) looter = getCheckedRandomMember(ItemId, target);
                break;
            case ITEM_RANDOM_SPOIL:
                looter = getCheckedRandomMember(ItemId, target);
                break;
            case ITEM_ORDER:
                if (!spoil) looter = getCheckedNextLooter(ItemId, target);
                break;
            case ITEM_ORDER_SPOIL:
                looter = getCheckedNextLooter(ItemId, target);
                break;
        }

        if (looter == null) looter = player;
        return looter;
	}

	/**
	 * true if player is party leader
	 * @param player
	 * @return
	 */
	public boolean isLeader(L2PcInstance player) { return (getLeader().equals(player)); }

	/**
	 * Returns the Object ID for the party leader to be used as a unique identifier of this party
	 * @return int
	 */
	public int getPartyLeaderOID() { return getLeader().getObjectId(); }

	/**
	 * Broadcasts packet to every party member
	 * @param msg
	 */
	public void broadcastToPartyMembers(L2GameServerPacket msg)
	{
		for (L2PcInstance member : getPartyMembers())
		{
			if (member != null)
				member.sendPacket(msg);
		}
	}
	
	public void broadcastToPartyMembersNewLeader()
	{
		for (L2PcInstance member : getPartyMembers())
		{
			if (member != null)
			{
				member.sendPacket(new PartySmallWindowDeleteAll());
				member.sendPacket(new PartySmallWindowAll(member, this));
				member.broadcastUserInfo();
			}
		}
	}
	
	public void broadcastCSToPartyMembers(CreatureSay msg, L2PcInstance broadcaster)
	{
		for (L2PcInstance member : getPartyMembers())
		{
			if (member != null && !BlockList.isBlocked(member, broadcaster))
				member.sendPacket(msg);
		}
	}


	/**
	 * Send a Server->Client packet to all other L2PcInstance of the Party.<BR><BR>
	 */
	public void broadcastToPartyMembers(L2PcInstance player, L2GameServerPacket msg)
	{
		for(L2PcInstance member : getPartyMembers())
		{
			if (member != null && !member.equals(player))
				member.sendPacket(msg);
		}
	}

	/**
	 * adds new member to party
	 * @param player
	 */
	public synchronized void addPartyMember(L2PcInstance player)
	{
		if (getPartyMembers().contains(player))
			return;
		
		//sends new member party window for all members
		//we do all actions before adding member to a list, this speeds things up a little
		player.sendPacket(new PartySmallWindowAll(player, this));

        // sends pets/summons of party members
        L2Summon summon;
        for (L2PcInstance pMember : getPartyMembers())
        {
            if (pMember != null && (summon = pMember.getPet()) != null)
            {
                player.sendPacket(new ExPartyPetWindowAdd(summon));
            }
        }
        
		SystemMessage msg = new SystemMessage(SystemMessageId.YOU_JOINED_S1_PARTY);
		msg.addString(getLeader().getName());
		player.sendPacket(msg);

		msg = new SystemMessage(SystemMessageId.C1_JOINED_PARTY);
		msg.addString(player.getName());
		broadcastToPartyMembers(msg);
		broadcastToPartyMembers(new PartySmallWindowAdd(player, this));
		// send the position of all party members to the new party member
		player.sendPacket(new PartyMemberPosition(player));
		// send the position of the new party member to all party members (except the new one - he knows his own position)
		broadcastToPartyMembers(player, new PartyMemberPosition(player));

        // if member has pet/summon add it to other as well
        if (player.getPet() != null)
        {
            broadcastToPartyMembers(new ExPartyPetWindowAdd(player.getPet()));
        }
        
		//add player to party, adjust party level
		getPartyMembers().add(player);
		if (player.getLevel() > _partyLvl)
		{
			_partyLvl = player.getLevel();
		}

		// update partySpelled
		for(L2PcInstance member : getPartyMembers())
        {
			if (member != null)
			{
				member.updateEffectIcons(true); // update party icons only
	            summon = member.getPet();
	            member.broadcastUserInfo();
	            if (summon != null)
	            {
	                summon.updateEffectIcons();
	            }
			}
        }

		if (isInDimensionalRift())
        {
			_dr.partyMemberInvited();
        }
		
		// open the CCInformationwindow
		if (isInCommandChannel())
		{
			player.sendPacket(new ExOpenMPCC());
		}
	}

	/**
	 * Remove player from party
	 * Overloaded method that takes player's name as parameter
	 * @param name
	 */
	public void removePartyMember(String name)
	{
		L2PcInstance player = getPlayerByName(name);

		if (player != null)
			removePartyMember(player);
	}

	/**
	 * Remove player from party
	 * @param player
     */
	public synchronized void removePartyMember(L2PcInstance player)
	{
		if (getPartyMembers().contains(player))
		{
			boolean isLeader = isLeader(player);
			getPartyMembers().remove(player);
			recalculatePartyLevel();

			if (player.isFestivalParticipant())
				SevenSignsFestival.getInstance().updateParticipants(player, this);

			if(player.isInDuel())
				DuelManager.getInstance().onRemoveFromParty(player);
			
			try
            {
                if (player.getFusionSkill() != null)
                    player.abortCast();
                
                for (L2Character character : player.getKnownList().getKnownCharacters())
                    if (character.getFusionSkill() != null && character.getFusionSkill().getTarget() == player)
                        character.abortCast();
            }
            catch (Exception e){}

			SystemMessage msg = new SystemMessage(SystemMessageId.YOU_LEFT_PARTY);
			player.sendPacket(msg);
			player.sendPacket(new PartySmallWindowDeleteAll());
			player.setParty(null);

			msg = new SystemMessage(SystemMessageId.C1_LEFT_PARTY);
			msg.addString(player.getName());
			broadcastToPartyMembers(msg);
			broadcastToPartyMembers(new PartySmallWindowDelete(player));
            L2Summon summon = player.getPet();
            if (summon != null)
            {
                broadcastToPartyMembers(new ExPartyPetWindowDelete(summon));
            }

			if (isInDimensionalRift())
				_dr.partyMemberExited(player);
			
			// Close the CCInfoWindow
			if (isInCommandChannel())
			{
				player.sendPacket(new ExCloseMPCC());
			}

			if (isLeader && getPartyMembers().size() > 1)
			{
				msg = new SystemMessage(SystemMessageId.C1_HAS_BECOME_A_PARTY_LEADER);
				msg.addString(getLeader().getName());
				broadcastToPartyMembers(msg);
				broadcastToPartyMembersNewLeader();
			}
			
			if (getPartyMembers().size() == 1)
			{
				if (isInCommandChannel())
				{
					// delete the whole command channel when the party who opened the channel is disbanded
					if (getCommandChannel().getChannelLeader().equals(getLeader()))
					{
						getCommandChannel().disbandChannel();
					}
					else 
					{
						getCommandChannel().removeParty(this);
					}
				}
				L2PcInstance leader = getLeader();
				if (leader != null)
				{
					leader.setParty(null);
					if (leader.isInDuel())
						DuelManager.getInstance().onRemoveFromParty(leader);
				}
				_members.clear();
			}
		}
	}

	/**
	 * Change party leader (used for string arguments)
	 * @param name
	 */
	public void changePartyLeader(String name)
	{
		L2PcInstance player = getPlayerByName(name);

		if (player != null && !player.isInDuel())
		{
			if (getPartyMembers().contains(player))
			{
				if (isLeader(player))
				{
					player.sendPacket(new SystemMessage(SystemMessageId.YOU_CANNOT_TRANSFER_RIGHTS_TO_YOURSELF));
				}
				else
				{
					//Swap party members
					L2PcInstance temp;
					int p1 = getPartyMembers().indexOf(player);
					temp = getLeader();
					getPartyMembers().set(0,getPartyMembers().get(p1));
					getPartyMembers().set(p1,temp);
					

					SystemMessage msg = new SystemMessage(SystemMessageId.C1_HAS_BECOME_A_PARTY_LEADER);
					msg.addString(getLeader().getName());
					broadcastToPartyMembers(msg);
					broadcastToPartyMembersNewLeader();
					if (isInCommandChannel() && temp.equals(_commandChannel.getChannelLeader()))
					{
						_commandChannel.setChannelLeader(getLeader());
						msg = new SystemMessage(SystemMessageId.COMMAND_CHANNEL_LEADER_NOW_C1);
						msg.addString(_commandChannel.getChannelLeader().getName());
						_commandChannel.broadcastToChannelMembers(msg);
					}
					if(player.isInPartyMatchRoom())
					{
						PartyMatchRoom room = PartyMatchRoomList.getInstance().getPlayerRoom(player);
						room.changeLeader(player);
					}
				}
			}
			else
			{
				player.sendPacket(new SystemMessage(SystemMessageId.YOU_CAN_TRANSFER_RIGHTS_ONLY_TO_ANOTHER_PARTY_MEMBER));
			}
		}

	}

	/**
	 * finds a player in the party by name
	 * @param name
	 * @return
	 */
	private L2PcInstance getPlayerByName(String name)
	{
		for(L2PcInstance member : getPartyMembers())
		{
			if (member.getName().equalsIgnoreCase(name)) return member;
		}
		return null;
	}

	/**
	 * distribute item(s) to party members
	 * @param player
	 * @param item
	 */
	public void distributeItem(L2PcInstance player, L2ItemInstance item)
	{
		if (item.getItemId() == 57)
		{
			distributeAdena(player, item.getCount(), player);
			ItemTable.getInstance().destroyItem("Party", item, player, null);
			return;
		}

		L2PcInstance target = getActualLooter(player, item.getItemId(), false, player);
		target.addItem("Party", item, player, true);

		// Send messages to other party members about reward
		if (item.getCount() > 1)
		{
			SystemMessage msg = new SystemMessage(SystemMessageId.C1_OBTAINED_S3_S2);
			msg.addString(target.getName());
			msg.addItemName(item);
			msg.addItemNumber(item.getCount());
			broadcastToPartyMembers(target, msg);
		}
		else
		{
			SystemMessage msg = new SystemMessage(SystemMessageId.C1_OBTAINED_S2);
			msg.addString(target.getName());
			msg.addItemName(item);
			broadcastToPartyMembers(target, msg);
		}
	}

	/**
	 * distribute item(s) to party members
	 * @param player
	 * @param item
	 */
	public void distributeItem(L2PcInstance player, L2Attackable.RewardItem item, boolean spoil, L2Attackable target)
	{
		if (item == null) return;

		if (item.getItemId() == 57)
		{
			distributeAdena(player, item.getCount(), target);
			return;
		}

		L2PcInstance looter = getActualLooter(player, item.getItemId(), spoil, target);

		looter.addItem(spoil?"Sweep":"Party", item.getItemId(), item.getCount(), player, true);

		// Send messages to other aprty members about reward
		if (item.getCount() > 1)
		{
			SystemMessage msg = spoil ?  new SystemMessage(SystemMessageId.C1_SWEEPED_UP_S3_S2)
			                          : new SystemMessage(SystemMessageId.C1_OBTAINED_S3_S2);
			msg.addString(looter.getName());
			msg.addItemName(item.getItemId());
			msg.addItemNumber(item.getCount());
			broadcastToPartyMembers(looter, msg);
		}
		else
		{
			SystemMessage msg = spoil ?  new SystemMessage(SystemMessageId.C1_SWEEPED_UP_S2)
			                          : new SystemMessage(SystemMessageId.C1_OBTAINED_S2);
			msg.addString(looter.getName());
			msg.addItemName(item.getItemId());
			broadcastToPartyMembers(looter, msg);
		}
	}

	/**
	 * distribute adena to party members
	 * @param adena
	 */
	public void distributeAdena(L2PcInstance player, long adena, L2Character target)
	{
		// Get all the party members
		List<L2PcInstance> membersList = getPartyMembers();
		
		// Check the number of party members that must be rewarded
		// (The party member must be in range to receive its reward)
		List<L2PcInstance> ToReward = FastList.newInstance();
		for(L2PcInstance member : membersList)
		{
			if (!Util.checkIfInRange(Config.ALT_PARTY_RANGE2, target, member, true)) continue;
			ToReward.add(member);
		}
		
		// Avoid null exceptions, if any
		if (ToReward.isEmpty()) return;
		
		// Now we can actually distribute the adena reward
		// (Total adena splitted by the number of party members that are in range and must be rewarded)
		long count = adena / ToReward.size();
		for (L2PcInstance member : ToReward)
		{
			member.addAdena("Party", count, player, true);
		}
		
		FastList.recycle((FastList<?>) ToReward);
	}

	/**
	 * Distribute Experience and SP rewards to L2PcInstance Party members in the known area of the last attacker.<BR><BR>
	 *
	 * <B><U> Actions</U> :</B><BR><BR>
	 * <li>Get the L2PcInstance owner of the L2SummonInstance (if necessary) </li>
	 * <li>Calculate the Experience and SP reward distribution rate </li>
	 * <li>Add Experience and SP to the L2PcInstance </li><BR><BR>
	 *
	 * <FONT COLOR=#FF0000><B> <U>Caution</U> : This method DOESN'T GIVE rewards to L2PetInstance</B></FONT><BR><BR>
	 * Exception are L2PetInstances that leech from the owner's XP; they get the exp indirectly, via the owner's exp gain<BR>
	 *
	 * @param xpReward The Experience reward to distribute
	 * @param spReward The SP reward to distribute
	 * @param rewardedMembers The list of L2PcInstance to reward
	 *
	 */
	public void distributeXpAndSp(long xpReward, int spReward, List<L2Playable> rewardedMembers, int topLvl, int partyDmg, L2Attackable target)
	{
		L2SummonInstance summon = null;
		List<L2Playable> validMembers = getValidMembers(rewardedMembers, topLvl);

		float penalty;
		double sqLevel;
		double preCalculation;

		xpReward *= getExpBonus(validMembers.size());
		spReward *= getSpBonus(validMembers.size());

		double sqLevelSum = 0;
		for (L2Playable character : validMembers)
			sqLevelSum += (character.getLevel() * character.getLevel());

        final float vitalityPoints = target.getVitalityPoints(partyDmg) * Config.RATE_PARTY_XP / validMembers.size();
        final boolean useVitalityRate = target.useVitalityRate();

        // Go through the L2PcInstances and L2PetInstances (not L2SummonInstances) that must be rewarded
		synchronized(rewardedMembers)
		{
			for (L2Character member : rewardedMembers)
			{
				if(member.isDead()) continue;

				penalty = 0;

				// The L2SummonInstance penalty
				if (member.getPet() instanceof L2SummonInstance)
				{
					summon     = (L2SummonInstance)member.getPet();
					penalty    = summon.getExpPenalty();
				}
				// Pets that leech xp from the owner (like babypets) do not get rewarded directly
				if (member instanceof L2PetInstance)
				{
					if (((L2PetInstance)member).getPetData().getOwnerExpTaken() > 0)
						continue;
					else // TODO: This is a temporary fix while correct pet xp in party is figured out
						penalty = (float)0.85;
				}


				// Calculate and add the EXP and SP reward to the member
				if (validMembers.contains(member))
				{
					sqLevel = member.getLevel() * member.getLevel();
					preCalculation = (sqLevel / sqLevelSum) * (1 - penalty);

					// Add the XP/SP points to the requested party member
					if (!member.isDead())
                    {
                        long addexp = Math.round(member.calcStat(Stats.EXPSP_RATE, xpReward * preCalculation, null, null));
                        int addsp = (int)member.calcStat(Stats.EXPSP_RATE, spReward * preCalculation, null, null);
                        if (member instanceof L2PcInstance)
                        {
                        	if (((L2PcInstance)member).getSkillLevel(467) > 0)
                        	{
                        		L2Skill skill = SkillTable.getInstance().getInfo(467,((L2PcInstance)member).getSkillLevel(467));
                        		
                        		if (skill.getExpNeeded() <= addexp)
                        			((L2PcInstance)member).absorbSoul(skill,target);
                        	}
                            ((L2PcInstance)member).addExpAndSp(addexp, addsp, useVitalityRate);
                            if (addexp > 0)
                                ((L2PcInstance)member).updateVitalityPoints(vitalityPoints, true, false);
                        }
                        else
                            member.addExpAndSp(addexp, addsp);
                    }
				}
				else
				{
					member.addExpAndSp(0, 0);
				}
			}
		}
	}

	/**
	 * refresh party level
	 *
	 */
	public void recalculatePartyLevel()
	{
		int newLevel = 0;
		for (L2PcInstance member : getPartyMembers())
		{
			if (member == null)
			{
				getPartyMembers().remove(member);
				continue;
			}
			
			if (member.getLevel() > newLevel)
				newLevel = member.getLevel();
		}
		_partyLvl = newLevel;
	}

	private List<L2Playable> getValidMembers(List<L2Playable> members, int topLvl)
	{
		List<L2Playable> validMembers = new FastList<L2Playable>();

//		Fixed LevelDiff cutoff point
		if (Config.PARTY_XP_CUTOFF_METHOD.equalsIgnoreCase("level"))
		{
			for (L2Playable member : members)
			{
				if (topLvl - member.getLevel() <= Config.PARTY_XP_CUTOFF_LEVEL)
					validMembers.add(member);
			}
		}
//		Fixed MinPercentage cutoff point
		else if (Config.PARTY_XP_CUTOFF_METHOD.equalsIgnoreCase("percentage"))
		{
			int sqLevelSum = 0;
			for (L2Playable member : members)
			{
				sqLevelSum += (member.getLevel() * member.getLevel());
			}

			for (L2Playable member : members)
			{
				int sqLevel = member.getLevel() * member.getLevel();
				if (sqLevel * 100 >= sqLevelSum * Config.PARTY_XP_CUTOFF_PERCENT)
					validMembers.add(member);
			}
		}
//		Automatic cutoff method
		else if (Config.PARTY_XP_CUTOFF_METHOD.equalsIgnoreCase("auto"))
		{
			int sqLevelSum = 0;
			for (L2Playable member : members)
			{
				sqLevelSum += (member.getLevel() * member.getLevel());
			}

			int i = members.size() - 1;
			if (i < 1 ) return members;
			if (i >= BONUS_EXP_SP.length) i = BONUS_EXP_SP.length -1;

			for (L2Playable member : members)
			{
				int sqLevel = member.getLevel() * member.getLevel();
				if (sqLevel >= sqLevelSum * (1-1/(1 +BONUS_EXP_SP[i] -BONUS_EXP_SP[i-1])))
					validMembers.add(member);
			}
		}
		else if (Config.PARTY_XP_CUTOFF_METHOD.equalsIgnoreCase("none"))
		{
			validMembers.addAll(members);
		}
		return validMembers;
	}

	private double getBaseExpSpBonus(int membersCount)
	{
		int i = membersCount -1;
		if (i < 1 ) return 1;
		if (i >= BONUS_EXP_SP.length) i = BONUS_EXP_SP.length -1;

		return BONUS_EXP_SP[i];
	}

	private double getExpBonus(int membersCount)
	{
		if(membersCount < 2)
		{
			//not is a valid party
			return getBaseExpSpBonus(membersCount);
		}
		else
		{
			return getBaseExpSpBonus(membersCount) * Config.RATE_PARTY_XP;
		}
	}

	private double getSpBonus(int membersCount)
	{
		if(membersCount < 2)
		{
			//not is a valid party
			return getBaseExpSpBonus(membersCount);
		}
		else
		{
			return getBaseExpSpBonus(membersCount) * Config.RATE_PARTY_SP;
		}
	}

	public int getLevel() { return _partyLvl; }

	public int getLootDistribution() { return _itemDistribution; }

	public boolean isInCommandChannel()
	{
		return _commandChannel != null;
	}

	public L2CommandChannel getCommandChannel()
	{
		return _commandChannel;
	}

	public void setCommandChannel(L2CommandChannel channel)
	{
		_commandChannel = channel;
	}

	public boolean isInDimensionalRift() { return _dr != null; }

	public void setDimensionalRift(DimensionalRift dr) { _dr = dr; }

	public DimensionalRift getDimensionalRift() { return _dr; }

	public L2PcInstance getLeader() 
	{
		try
		{
			return _members.getFirst();
		}
		catch(NoSuchElementException e)
		{
			return null;
		}
	}
}
