/*
 * This file is part of Applied Energistics 2.
 * Copyright (c) 2013 - 2014, AlgorithmX2, All rights reserved.
 *
 * Applied Energistics 2 is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Applied Energistics 2 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with Applied Energistics 2.  If not, see <http://www.gnu.org/licenses/lgpl>.
 */

package appeng.integration.modules.waila.tile;


import java.util.List;

import net.minecraft.entity.player.EntityPlayerMP;
import net.minecraft.item.ItemStack;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.tileentity.TileEntity;
import net.minecraft.util.math.BlockPos;
import net.minecraft.world.World;

import gnu.trove.map.TObjectLongMap;
import gnu.trove.map.hash.TObjectLongHashMap;
import mcp.mobius.waila.api.ITaggedList;
import mcp.mobius.waila.api.IWailaConfigHandler;
import mcp.mobius.waila.api.IWailaDataAccessor;

import appeng.api.networking.energy.IAEPowerStorage;
import appeng.core.localization.WailaText;
import appeng.integration.modules.waila.BaseWailaDataProvider;
import appeng.util.Platform;


/**
 * Power storage provider for WAILA
 *
 * @author thatsIch
 * @version rv2
 * @since rv2
 */
public final class PowerStorageWailaDataProvider extends BaseWailaDataProvider
{
	/**
	 * Power key used for the transferred {@link net.minecraft.nbt.NBTTagCompound}
	 */
	private static final String ID_CURRENT_POWER = "currentPower";

	/**
	 * Used cache for power if the power was not transmitted through the server.
	 * <p/>
	 * This is useful, when a player just started to look at a tile and thus just requested the new information from the
	 * server.
	 * <p/>
	 * The cache will be updated from the server.
	 */
	private final TObjectLongMap<TileEntity> cache = new TObjectLongHashMap<TileEntity>();

	/**
	 * Adds the current and max power to the tool tip
	 * Will ignore if the tile has an energy buffer ( > 0 )
	 *
	 * @param itemStack stack of power storage
	 * @param currentToolTip current tool tip
	 * @param accessor wrapper for various world information
	 * @param config config to react to various settings
	 *
	 * @return modified tool tip
	 */
	@Override
	public List<String> getWailaBody( final ItemStack itemStack, final List<String> currentToolTip, final IWailaDataAccessor accessor, final IWailaConfigHandler config )
	{
		// Removes RF tooltip on WAILA 1.5.9+
		( (ITaggedList<String, String>) currentToolTip ).removeEntries( "RFEnergyStorage" );

		final TileEntity te = accessor.getTileEntity();
		if( te instanceof IAEPowerStorage )
		{
			final IAEPowerStorage storage = (IAEPowerStorage) te;

			final double maxPower = storage.getAEMaxPower();
			if( maxPower > 0 )
			{
				final NBTTagCompound tag = accessor.getNBTData();

				final long internalCurrentPower = this.getInternalCurrentPower( tag, te );

				if( internalCurrentPower >= 0 )
				{
					final long internalMaxPower = (long) ( 100 * maxPower );

					final String formatCurrentPower = Platform.formatPowerLong( internalCurrentPower, false );
					final String formatMaxPower = Platform.formatPowerLong( internalMaxPower, false );

					currentToolTip.add( WailaText.Contains.getLocal() + ": " + formatCurrentPower + " / " + formatMaxPower );
				}
			}
		}

		return currentToolTip;
	}

	/**
	 * Called on server to transfer information from server to client.
	 * <p/>
	 * If the {@link net.minecraft.tileentity.TileEntity} is a {@link appeng.api.networking.energy.IAEPowerStorage}, it
	 * writes the power information to the {@code #tag} using the {@code #ID_CURRENT_POWER} key.
	 *
	 * @param player player looking at the power storage
	 * @param te power storage
	 * @param tag transferred tag which is send to the client
	 * @param world world of the power storage
	 * @param pos pos of the power storage
	 *
	 * @return tag send to the client
	 */
	@Override
	public NBTTagCompound getNBTData( EntityPlayerMP player, TileEntity te, NBTTagCompound tag, World world, BlockPos pos )
	{
		if( te instanceof IAEPowerStorage )
		{
			final IAEPowerStorage storage = (IAEPowerStorage) te;

			if( storage.getAEMaxPower() > 0 )
			{
				final long internalCurrentPower = (long) ( 100 * storage.getAECurrentPower() );

				tag.setLong( ID_CURRENT_POWER, internalCurrentPower );
			}
		}

		return tag;
	}

	/**
	 * Determines the current power.
	 * <p/>
	 * If the client received power information on the server, they are used, else if the cache contains a previous
	 * stored value, this will be used. Default value is 0.
	 *
	 * @param te te to be looked at
	 * @param tag tag maybe containing the channel information
	 *
	 * @return used channels on the cable
	 */
	private long getInternalCurrentPower( final NBTTagCompound tag, final TileEntity te )
	{
		final long internalCurrentPower;

		if( tag.hasKey( ID_CURRENT_POWER ) )
		{
			internalCurrentPower = tag.getLong( ID_CURRENT_POWER );
			this.cache.put( te, internalCurrentPower );
		}
		else if( this.cache.containsKey( te ) )
		{
			internalCurrentPower = this.cache.get( te );
		}
		else
		{
			internalCurrentPower = -1;
		}

		return internalCurrentPower;
	}
}