/*
 * 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.itemcontainer;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.logging.Level;
import java.util.logging.Logger;

import net.sf.l2j.Config;
import net.sf.l2j.L2DatabaseFactory;
import net.sf.l2j.gameserver.GameTimeController;
import net.sf.l2j.gameserver.datatables.ItemTable;
import net.sf.l2j.gameserver.model.L2ItemInstance;
import net.sf.l2j.gameserver.model.L2ItemInstance.ItemLocation;
import net.sf.l2j.gameserver.model.L2Object;
import net.sf.l2j.gameserver.model.L2World;
import net.sf.l2j.gameserver.model.actor.L2Character;
import net.sf.l2j.gameserver.model.actor.instance.L2PcInstance;
import net.sf.l2j.gameserver.templates.item.L2Item;

/**
 * @author Advi
 */
public abstract class ItemContainer
{
	protected static final Logger _log = Logger.getLogger(ItemContainer.class.getName());
	
	protected final List<L2ItemInstance> _items;
	
	protected ItemContainer()
	{
		_items = new CopyOnWriteArrayList<>();
	}
	
	protected abstract L2Character getOwner();
	
	protected abstract ItemLocation getBaseLocation();
	
	public String getName()
	{
		return "ItemContainer";
	}
	
	/**
	 * Returns the ownerID of the inventory
	 * @return int
	 */
	public int getOwnerId()
	{
		return getOwner() == null ? 0 : getOwner().getObjectId();
	}
	
	/**
	 * Returns the quantity of items in the inventory
	 * @return int
	 */
	public int getSize()
	{
		return _items.size();
	}
	
	/**
	 * Returns the list of items in inventory
	 * @return L2ItemInstance : items in inventory
	 */
	public L2ItemInstance[] getItems()
	{
		synchronized (_items)
		{
			return _items.toArray(new L2ItemInstance[_items.size()]);
		}
	}
	
	/**
	 * Returns the item from inventory by using its <B>itemId</B>.
	 * @param itemId : int designating the ID of the item
	 * @return L2ItemInstance designating the item or null if not found in inventory
	 */
	public L2ItemInstance getItemByItemId(int itemId)
	{
		for (L2ItemInstance item : _items)
			if (item != null && item.getItemId() == itemId)
				return item;
		
		return null;
	}
	
	/**
	 * Check for multiple items in player's inventory.
	 * @param itemIds a list of item Ids to check.
	 * @return true if at least one items exists in player's inventory, false otherwise
	 */
	public boolean hasAtLeastOneItem(int... itemIds)
	{
		for (int itemId : itemIds)
		{
			if (getItemByItemId(itemId) != null)
				return true;
		}
		return false;
	}
	
	/**
	 * Returns the item's list from inventory by using its <B>itemId</B><BR>
	 * <BR>
	 * @param itemId : int designating the ID of the item
	 * @return List<L2ItemInstance> designating the items list (empty list if not found)
	 */
	public List<L2ItemInstance> getItemsByItemId(int itemId)
	{
		List<L2ItemInstance> returnList = new ArrayList<>();
		for (L2ItemInstance item : _items)
		{
			if (item != null && item.getItemId() == itemId)
				returnList.add(item);
		}
		return returnList;
	}
	
	/**
	 * Returns the item from inventory by using its <B>itemId</B><BR>
	 * <BR>
	 * @param itemId : int designating the ID of the item
	 * @param itemToIgnore : used during a loop, to avoid returning the same item
	 * @return L2ItemInstance designating the item or null if not found in inventory
	 */
	public L2ItemInstance getItemByItemId(int itemId, L2ItemInstance itemToIgnore)
	{
		for (L2ItemInstance item : _items)
			if (item != null && item.getItemId() == itemId && !item.equals(itemToIgnore))
				return item;
		
		return null;
	}
	
	/**
	 * Returns item from inventory by using its <B>objectId</B>
	 * @param objectId : int designating the ID of the object
	 * @return L2ItemInstance designating the item or null if not found in inventory
	 */
	public L2ItemInstance getItemByObjectId(int objectId)
	{
		for (L2ItemInstance item : _items)
		{
			if (item == null)
				continue;
			
			if (item.getObjectId() == objectId)
				return item;
		}
		return null;
	}
	
	/**
	 * @param itemId
	 * @param enchantLevel
	 * @return
	 * @see net.sf.l2j.gameserver.model.itemcontainer.ItemContainer#getInventoryItemCount(int, int, boolean)
	 */
	public int getInventoryItemCount(int itemId, int enchantLevel)
	{
		return getInventoryItemCount(itemId, enchantLevel, true);
	}
	
	/**
	 * Gets count of item in the inventory
	 * @param itemId : Item to look for
	 * @param enchantLevel : enchant level to match on, or -1 for ANY enchant level
	 * @param includeEquipped : include equipped items
	 * @return int corresponding to the number of items matching the above conditions.
	 */
	public int getInventoryItemCount(int itemId, int enchantLevel, boolean includeEquipped)
	{
		int count = 0;
		
		for (L2ItemInstance item : _items)
			if (item.getItemId() == itemId && ((item.getEnchantLevel() == enchantLevel) || (enchantLevel < 0)) && (includeEquipped || !item.isEquipped()))
				if (item.isStackable())
					count = item.getCount();
				else
					count++;
		
		return count;
	}
	
	/**
	 * Adds item to inventory
	 * @param process : String Identifier of process triggering this action
	 * @param item : L2ItemInstance to be added
	 * @param actor : L2PcInstance Player requesting the item add
	 * @param reference : L2Object Object referencing current action like NPC selling item or previous item in transformation
	 * @return L2ItemInstance corresponding to the new item or the updated item in inventory
	 */
	public L2ItemInstance addItem(String process, L2ItemInstance item, L2PcInstance actor, L2Object reference)
	{
		L2ItemInstance olditem = getItemByItemId(item.getItemId());
		
		// If stackable item is found in inventory just add to current quantity
		if (olditem != null && olditem.isStackable())
		{
			int count = item.getCount();
			olditem.changeCount(process, count, actor, reference);
			olditem.setLastChange(L2ItemInstance.MODIFIED);
			
			// And destroys the item
			ItemTable.getInstance().destroyItem(process, item, actor, reference);
			item.updateDatabase();
			item = olditem;
			
			// Updates database
			if (item.getItemId() == 57 && count < 10000 * Config.RATE_DROP_ADENA)
			{
				// Small adena changes won't be saved to database all the time
				if (GameTimeController.getGameTicks() % 5 == 0)
					item.updateDatabase();
			}
			else
				item.updateDatabase();
		}
		// If item hasn't be found in inventory, create new one
		else
		{
			item.setOwnerId(process, getOwnerId(), actor, reference);
			item.setLocation(getBaseLocation());
			item.setLastChange((L2ItemInstance.ADDED));
			
			// Add item in inventory
			addItem(item);
			
			// Updates database
			item.updateDatabase();
		}
		
		refreshWeight();
		return item;
	}
	
	/**
	 * Adds item to inventory
	 * @param process : String Identifier of process triggering this action
	 * @param itemId : int Item Identifier of the item to be added
	 * @param count : int Quantity of items to be added
	 * @param actor : L2PcInstance Player requesting the item add
	 * @param reference : L2Object Object referencing current action like NPC selling item or previous item in transformation
	 * @return L2ItemInstance corresponding to the new item or the updated item in inventory
	 */
	public L2ItemInstance addItem(String process, int itemId, int count, L2PcInstance actor, L2Object reference)
	{
		L2ItemInstance item = getItemByItemId(itemId);
		
		// If stackable item is found in inventory just add to current quantity
		if (item != null && item.isStackable())
		{
			item.changeCount(process, count, actor, reference);
			item.setLastChange(L2ItemInstance.MODIFIED);
			// Updates database
			if (itemId == 57 && count < 10000 * Config.RATE_DROP_ADENA)
			{
				// Small adena changes won't be saved to database all the time
				if (GameTimeController.getGameTicks() % 5 == 0)
					item.updateDatabase();
			}
			else
				item.updateDatabase();
		}
		// If item hasn't be found in inventory, create new one
		else
		{
			for (int i = 0; i < count; i++)
			{
				L2Item template = ItemTable.getInstance().getTemplate(itemId);
				if (template == null)
				{
					_log.log(Level.WARNING, (actor != null ? "[" + actor.getName() + "] " : "") + "Invalid ItemId requested: ", itemId);
					return null;
				}
				
				item = ItemTable.getInstance().createItem(process, itemId, template.isStackable() ? count : 1, actor, reference);
				item.setOwnerId(getOwnerId());
				item.setLocation(getBaseLocation());
				item.setLastChange(L2ItemInstance.ADDED);
				
				// Add item in inventory
				addItem(item);
				// Updates database
				item.updateDatabase();
				
				// If stackable, end loop as entire count is included in 1 instance of item
				if (template.isStackable() || !Config.MULTIPLE_ITEM_DROP)
					break;
			}
		}
		
		refreshWeight();
		return item;
	}
	
	/**
	 * Transfers item to another inventory
	 * @param process : String Identifier of process triggering this action
	 * @param objectId : int objectid of the item to be transfered
	 * @param count : int Quantity of items to be transfered
	 * @param target
	 * @param actor : L2PcInstance Player requesting the item transfer
	 * @param reference : L2Object Object referencing current action like NPC selling item or previous item in transformation
	 * @return L2ItemInstance corresponding to the new item or the updated item in inventory
	 */
	public L2ItemInstance transferItem(String process, int objectId, int count, ItemContainer target, L2PcInstance actor, L2Object reference)
	{
		if (target == null)
			return null;
		
		L2ItemInstance sourceitem = getItemByObjectId(objectId);
		if (sourceitem == null)
			return null;
		
		L2ItemInstance targetitem = sourceitem.isStackable() ? target.getItemByItemId(sourceitem.getItemId()) : null;
		
		synchronized (sourceitem)
		{
			// check if this item still present in this container
			if (getItemByObjectId(objectId) != sourceitem)
				return null;
			
			// Check if requested quantity is available
			if (count > sourceitem.getCount())
				count = sourceitem.getCount();
			
			// If possible, move entire item object
			if (sourceitem.getCount() == count && targetitem == null)
			{
				removeItem(sourceitem);
				target.addItem(process, sourceitem, actor, reference);
				targetitem = sourceitem;
			}
			else
			{
				if (sourceitem.getCount() > count) // If possible, only update counts
					sourceitem.changeCount(process, -count, actor, reference);
				else
				// Otherwise destroy old item
				{
					removeItem(sourceitem);
					ItemTable.getInstance().destroyItem(process, sourceitem, actor, reference);
				}
				
				if (targetitem != null) // If possible, only update counts
					targetitem.changeCount(process, count, actor, reference);
				else
					// Otherwise add new item
					targetitem = target.addItem(process, sourceitem.getItemId(), count, actor, reference);
			}
			
			// Updates database
			sourceitem.updateDatabase();
			
			if (targetitem != sourceitem && targetitem != null)
				targetitem.updateDatabase();
			
			if (sourceitem.isAugmented())
				sourceitem.getAugmentation().removeBonus(actor);
			
			refreshWeight();
			target.refreshWeight();
		}
		return targetitem;
	}
	
	/**
	 * Destroy item from inventory and updates database
	 * @param process : String Identifier of process triggering this action
	 * @param item : L2ItemInstance to be destroyed
	 * @param actor : L2PcInstance Player requesting the item destroy
	 * @param reference : L2Object Object referencing current action like NPC selling item or previous item in transformation
	 * @return L2ItemInstance corresponding to the destroyed item or the updated item in inventory
	 */
	public L2ItemInstance destroyItem(String process, L2ItemInstance item, L2PcInstance actor, L2Object reference)
	{
		return this.destroyItem(process, item, item.getCount(), actor, reference);
	}
	
	/**
	 * Destroy item from inventory and updates database
	 * @param process : String Identifier of process triggering this action
	 * @param item : L2ItemInstance to be destroyed
	 * @param count
	 * @param actor : L2PcInstance Player requesting the item destroy
	 * @param reference : L2Object Object referencing current action like NPC selling item or previous item in transformation
	 * @return L2ItemInstance corresponding to the destroyed item or the updated item in inventory
	 */
	public L2ItemInstance destroyItem(String process, L2ItemInstance item, int count, L2PcInstance actor, L2Object reference)
	{
		synchronized (item)
		{
			// Adjust item quantity
			if (item.getCount() > count)
			{
				item.changeCount(process, -count, actor, reference);
				item.setLastChange(L2ItemInstance.MODIFIED);
				
				// don't update often for untraced items
				if (process != null || GameTimeController.getGameTicks() % 10 == 0)
				{
					item.updateDatabase();
				}
				
				refreshWeight();
				
				return item;
			}
			
			if (item.getCount() < count)
				return null;
			
			boolean removed = removeItem(item);
			if (!removed)
				return null;
			
			ItemTable.getInstance().destroyItem(process, item, actor, reference);
			
			item.updateDatabase();
			refreshWeight();
		}
		return item;
	}
	
	/**
	 * Destroy item from inventory by using its <B>objectID</B> and updates database
	 * @param process : String Identifier of process triggering this action
	 * @param objectId : int Item Instance identifier of the item to be destroyed
	 * @param count : int Quantity of items to be destroyed
	 * @param actor : L2PcInstance Player requesting the item destroy
	 * @param reference : L2Object Object referencing current action like NPC selling item or previous item in transformation
	 * @return L2ItemInstance corresponding to the destroyed item or the updated item in inventory
	 */
	public L2ItemInstance destroyItem(String process, int objectId, int count, L2PcInstance actor, L2Object reference)
	{
		L2ItemInstance item = getItemByObjectId(objectId);
		if (item == null)
			return null;
		
		return this.destroyItem(process, item, count, actor, reference);
	}
	
	/**
	 * Destroy item from inventory by using its <B>itemId</B> and updates database
	 * @param process : String Identifier of process triggering this action
	 * @param itemId : int Item identifier of the item to be destroyed
	 * @param count : int Quantity of items to be destroyed
	 * @param actor : L2PcInstance Player requesting the item destroy
	 * @param reference : L2Object Object referencing current action like NPC selling item or previous item in transformation
	 * @return L2ItemInstance corresponding to the destroyed item or the updated item in inventory
	 */
	public L2ItemInstance destroyItemByItemId(String process, int itemId, int count, L2PcInstance actor, L2Object reference)
	{
		L2ItemInstance item = getItemByItemId(itemId);
		if (item == null)
			return null;
		
		return this.destroyItem(process, item, count, actor, reference);
	}
	
	/**
	 * Destroy all items from inventory and updates database
	 * @param process : String Identifier of process triggering this action
	 * @param actor : L2PcInstance Player requesting the item destroy
	 * @param reference : L2Object Object referencing current action like NPC selling item or previous item in transformation
	 */
	public synchronized void destroyAllItems(String process, L2PcInstance actor, L2Object reference)
	{
		for (L2ItemInstance item : _items)
		{
			if (item != null)
				destroyItem(process, item, actor, reference);
		}
	}
	
	/**
	 * Get warehouse adena
	 * @return
	 */
	public int getAdena()
	{
		int count = 0;
		
		for (L2ItemInstance item : _items)
		{
			if (item != null && item.getItemId() == 57)
			{
				count = item.getCount();
				return count;
			}
		}
		return count;
	}
	
	/**
	 * Adds item to inventory for further adjustments.
	 * @param item : L2ItemInstance to be added from inventory
	 */
	protected void addItem(L2ItemInstance item)
	{
		synchronized (_items)
		{
			_items.add(item);
		}
	}
	
	/**
	 * Removes item from inventory for further adjustments.
	 * @param item : L2ItemInstance to be removed from inventory
	 * @return
	 */
	protected boolean removeItem(L2ItemInstance item)
	{
		synchronized (_items)
		{
			return _items.remove(item);
		}
	}
	
	/**
	 * Refresh the weight of equipment loaded
	 */
	protected void refreshWeight()
	{
	}
	
	/**
	 * Delete item object from world
	 */
	public void deleteMe()
	{
		try
		{
			updateDatabase();
		}
		catch (Exception e)
		{
			_log.log(Level.SEVERE, "deletedMe()", e);
		}
		List<L2Object> items = new ArrayList<L2Object>(_items);
		_items.clear();
		
		L2World.getInstance().removeObjects(items);
	}
	
	/**
	 * Update database with items in inventory
	 */
	public void updateDatabase()
	{
		if (getOwner() != null)
		{
			for (L2ItemInstance item : _items)
			{
				if (item != null)
					item.updateDatabase();
			}
		}
	}
	
	/**
	 * Get back items in container from database
	 */
	public void restore()
	{
		try (Connection con = L2DatabaseFactory.getInstance().getConnection())
		{
			PreparedStatement statement = con.prepareStatement("SELECT object_id, item_id, count, enchant_level, loc, loc_data, custom_type1, custom_type2, mana_left, time FROM items WHERE owner_id=? AND (loc=?)");
			statement.setInt(1, getOwnerId());
			statement.setString(2, getBaseLocation().name());
			ResultSet inv = statement.executeQuery();
			
			L2ItemInstance item;
			while (inv.next())
			{
				item = L2ItemInstance.restoreFromDb(getOwnerId(), inv);
				if (item == null)
					continue;
				
				L2World.getInstance().storeObject(item);
				
				L2PcInstance owner = getOwner() == null ? null : getOwner().getActingPlayer();
				
				// If stackable item is found in inventory just add to current quantity
				if (item.isStackable() && getItemByItemId(item.getItemId()) != null)
					addItem("Restore", item, owner, null);
				else
					addItem(item);
			}
			inv.close();
			statement.close();
			refreshWeight();
		}
		catch (Exception e)
		{
			_log.log(Level.WARNING, "could not restore container:", e);
		}
	}
	
	public boolean validateCapacity(int slots)
	{
		return true;
	}
	
	public boolean validateWeight(int weight)
	{
		return true;
	}
}