/*
 * 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.instancemanager;

import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;

import javolution.util.FastList;
import net.sf.l2j.Config;
import net.sf.l2j.L2DatabaseFactory;
import net.sf.l2j.gameserver.ItemsAutoDestroy;
import net.sf.l2j.gameserver.ThreadPoolManager;
import net.sf.l2j.gameserver.model.L2ItemInstance;
import net.sf.l2j.gameserver.model.L2Object;
import net.sf.l2j.gameserver.model.L2World;
import net.sf.l2j.gameserver.templates.L2EtcItemType;

/**
 * This class manage all items on ground
 *
 * @version $Revision: $ $Date: $
 * @author DiezelMax - original ideea
 * @author Enforcer - actual build
 */
public class ItemsOnGroundManager
{
	static final Logger _log = Logger.getLogger(ItemsOnGroundManager.class.getName());
	private static ItemsOnGroundManager _instance;
	protected List<L2ItemInstance> _items = null;

	private ItemsOnGroundManager()
	{
		if (!Config.SAVE_DROPPED_ITEM)
			return;
		_items = new FastList<L2ItemInstance>();
		if (Config.SAVE_DROPPED_ITEM_INTERVAL > 0)
			ThreadPoolManager.getInstance().scheduleGeneralAtFixedRate(new storeInDb(), Config.SAVE_DROPPED_ITEM_INTERVAL, Config.SAVE_DROPPED_ITEM_INTERVAL);
	}

	public static final ItemsOnGroundManager getInstance()
	{
		if (_instance == null)
		{
			_instance = new ItemsOnGroundManager();
			_instance.load();
		}
		return _instance;
	}

	private void load()
	{
		// If SaveDroppedItem is false, may want to delete all items previously
		// stored to avoid add old items on reactivate
		if (!Config.SAVE_DROPPED_ITEM && Config.CLEAR_DROPPED_ITEM_TABLE)
			emptyTable();
		if (!Config.SAVE_DROPPED_ITEM)
			return;
		// if DestroyPlayerDroppedItem was previously false, items curently
		// protected will be added to ItemsAutoDestroy
		if (Config.DESTROY_DROPPED_PLAYER_ITEM)
		{
			java.sql.Connection con = null;
			try
			{
				String str = null;
				if (!Config.DESTROY_EQUIPABLE_PLAYER_ITEM) // Recycle misc.
					// items only
					str = "update itemsonground set drop_time=? where drop_time=-1 and equipable=0";
				else if (Config.DESTROY_EQUIPABLE_PLAYER_ITEM) // Recycle all
					// items
					// including
					// equipable
					str = "update itemsonground set drop_time=? where drop_time=-1";
				con = L2DatabaseFactory.getInstance().getConnection();
				PreparedStatement statement = con.prepareStatement(str);
				statement.setLong(1, System.currentTimeMillis());
				statement.execute();
				statement.close();
			}
			catch (Exception e)
			{
				_log.log(Level.SEVERE, "error while updating table ItemsOnGround " + e);
				e.printStackTrace();
			}
			finally
			{
				try
				{
					con.close();
				}
				catch (Exception e)
				{
				}
			}
		}
		// Add items to world
		java.sql.Connection con = null;
		try
		{
			try
			{
				con = L2DatabaseFactory.getInstance().getConnection();
				Statement s = con.createStatement();
				ResultSet result;
				int count = 0;
				result = s.executeQuery("select object_id,item_id,count,enchant_level,x,y,z,drop_time,equipable from itemsonground");
				while (result.next())
				{
					L2ItemInstance item = new L2ItemInstance(result.getInt(1), result.getInt(2));
					L2World.getInstance().storeObject(item);
					if (item.isStackable() && result.getInt(3) > 1) // this
						// check
						// and..
						item.setCount(result.getInt(3));
					if (result.getInt(4) > 0) // this, are really necessary?
						item.setEnchantLevel(result.getInt(4));
					item.getPosition().setWorldPosition(result.getInt(5), result.getInt(6), result.getInt(7));
					item.getPosition().setWorldRegion(L2World.getInstance().getRegion(item.getPosition().getWorldPosition()));
					item.getPosition().getWorldRegion().addVisibleObject(item);
					item.setDropTime(result.getLong(8));
					if (result.getLong(8) == -1)
						item.setProtected(true);
					else
						item.setProtected(false);
					item.setIsVisible(true);
					L2World.getInstance().addVisibleObject(item, item.getPosition().getWorldRegion(), null);
					_items.add(item);
					count++;
					// add to ItemsAutoDestroy only items not protected
					if (!Config.LIST_PROTECTED_ITEMS.contains(item.getItemId()))
					{
						if (result.getLong(8) > -1)
						{
							if (Config.AUTODESTROY_ITEM_AFTER > 0 && item.getItemType() != L2EtcItemType.HERB || Config.HERB_AUTO_DESTROY_TIME > 0 && item.getItemType() == L2EtcItemType.HERB)
								ItemsAutoDestroy.getInstance().addItem(item);
						}
					}
				}
				result.close();
				s.close();
				if (count > 0)
					System.out.println("ItemsOnGroundManager: restored " + count + " items.");
				else
					System.out.println("Initializing ItemsOnGroundManager.");
			}
			catch (Exception e)
			{
				_log.log(Level.SEVERE, "error while loading ItemsOnGround " + e);
				e.printStackTrace();
			}
		}
		finally
		{
			try
			{
				con.close();
			}
			catch (Exception e)
			{
			}
		}
		if (Config.EMPTY_DROPPED_ITEM_TABLE_AFTER_LOAD)
			emptyTable();
	}

	public void save(L2ItemInstance item)
	{
		if (!Config.SAVE_DROPPED_ITEM)
			return;
		_items.add(item);
	}

	public void removeObject(L2Object item)
	{
		if (!Config.SAVE_DROPPED_ITEM)
			return;
		_items.remove(item);
	}

	public void saveInDb()
	{
		new storeInDb().run();
	}

	public void cleanUp()
	{
		_items.clear();
	}

	public void emptyTable()
	{
		java.sql.Connection conn = null;
		try
		{
			conn = L2DatabaseFactory.getInstance().getConnection();
			PreparedStatement del = conn.prepareStatement("delete from itemsonground");
			del.execute();
			del.close();
		}
		catch (Exception e1)
		{
			_log.log(Level.SEVERE, "error while cleaning table ItemsOnGround " + e1);
			e1.printStackTrace();
		}
		finally
		{
			try
			{
				conn.close();
			}
			catch (Exception e1)
			{
			}
		}
	}

	protected class storeInDb extends Thread
	{
		@Override
		public void run()
		{
			if (!Config.SAVE_DROPPED_ITEM)
				return;
			emptyTable();
			if (_items.isEmpty())
			{
				if (Config.DEBUG)
					_log.warning("ItemsOnGroundManager: nothing to save...");
				return;
			}
			for (L2ItemInstance item : _items)
			{
				if (CursedWeaponsManager.getInstance().isCursed(item.getItemId()))
					continue; // Cursed Items not saved to ground, prevent
				// double save
				java.sql.Connection con = null;
				try
				{
					con = L2DatabaseFactory.getInstance().getConnection();
					PreparedStatement statement = con.prepareStatement("insert into itemsonground(object_id,item_id,count,enchant_level,x,y,z,drop_time,equipable) values(?,?,?,?,?,?,?,?,?)");
					statement.setInt(1, item.getObjectId());
					statement.setInt(2, item.getItemId());
					statement.setInt(3, item.getCount());
					statement.setInt(4, item.getEnchantLevel());
					statement.setInt(5, item.getX());
					statement.setInt(6, item.getY());
					statement.setInt(7, item.getZ());
					if (item.isProtected())
						statement.setLong(8, -1); // item will be
					// protected
					else
						statement.setLong(8, item.getDropTime()); // item
					// will
					// be added
					// to
					// ItemsAutoDestroy
					if (item.isEquipable())
						statement.setLong(9, 1); // set equipable
					else
						statement.setLong(9, 0);
					statement.execute();
					statement.close();
				}
				catch (Exception e)
				{
					_log.log(Level.SEVERE, "error while inserting into table ItemsOnGround " + e);
					e.printStackTrace();
				}
				finally
				{
					try
					{
						con.close();
					}
					catch (Exception e)
					{
					}
				}
			}
			if (Config.DEBUG)
				_log.warning("ItemsOnGroundManager: " + _items.size() + " items on ground saved");
		}
	}
}
