/*
 * 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.items.tools.powered.powersink;


import javax.annotation.Nullable;

import net.darkhax.tesla.api.ITeslaConsumer;
import net.darkhax.tesla.api.ITeslaHolder;
import net.minecraft.item.ItemStack;
import net.minecraft.util.EnumFacing;
import net.minecraftforge.common.capabilities.Capability;
import net.minecraftforge.common.capabilities.ICapabilityProvider;
import net.minecraftforge.energy.CapabilityEnergy;
import net.minecraftforge.energy.IEnergyStorage;

import appeng.api.config.PowerUnits;
import appeng.api.implementations.items.IAEItemPowerStorage;
import appeng.capabilities.Capabilities;


/**
 * The capability provider to expose chargable items to other mods.
 */
class PoweredItemCapabilities implements ICapabilityProvider, IEnergyStorage
{

	private final ItemStack is;

	private final IAEItemPowerStorage item;

	private final Object teslaAdapter;

	PoweredItemCapabilities( ItemStack is, IAEItemPowerStorage item )
	{
		this.is = is;
		this.item = item;
		if( Capabilities.TESLA_CONSUMER != null || Capabilities.TESLA_HOLDER != null )
		{
			this.teslaAdapter = new TeslaAdapter();
		}
		else
		{
			this.teslaAdapter = null;
		}
	}

	@Override
	public boolean hasCapability( Capability<?> capability, @Nullable EnumFacing facing )
	{
		return capability == CapabilityEnergy.ENERGY || capability == Capabilities.TESLA_CONSUMER || capability == Capabilities.TESLA_HOLDER;
	}

	@SuppressWarnings( "unchecked" )
	@Override
	public <T> T getCapability( Capability<T> capability, @Nullable EnumFacing facing )
	{
		if( capability == CapabilityEnergy.ENERGY )
		{
			return (T) this;
		}
		else if( capability == Capabilities.TESLA_CONSUMER || capability == Capabilities.TESLA_HOLDER )
		{
			return (T) teslaAdapter;
		}
		return null;
	}

	@Override
	public int receiveEnergy( int maxReceive, boolean simulate )
	{

		if( simulate )
		{
			final int required = (int) PowerUnits.AE.convertTo( PowerUnits.RF, item.getAEMaxPower( is ) - item.getAECurrentPower( is ) );
			if( maxReceive < required )
			{
				return 0;
			}
			return maxReceive - required;
		}
		else
		{
			final double powerRemainder = item.injectAEPower( is, PowerUnits.RF.convertTo( PowerUnits.AE, maxReceive ) );
			return (int) PowerUnits.AE.convertTo( PowerUnits.RF, powerRemainder );
		}
	}

	@Override
	public int extractEnergy( int maxExtract, boolean simulate )
	{
		return 0;
	}

	@Override
	public int getEnergyStored()
	{
		return (int) PowerUnits.AE.convertTo( PowerUnits.RF, item.getAECurrentPower( is ) );
	}

	@Override
	public int getMaxEnergyStored()
	{
		return (int) PowerUnits.AE.convertTo( PowerUnits.RF, item.getAEMaxPower( is ) );
	}

	@Override
	public boolean canExtract()
	{
		return false;
	}

	@Override
	public boolean canReceive()
	{
		return true;
	}

	private class TeslaAdapter implements ITeslaConsumer, ITeslaHolder
	{

		@Override
		public long givePower( long power, boolean simulated )
		{
			return receiveEnergy( (int) power, simulated );
		}

		@Override
		public long getStoredPower()
		{
			return getEnergyStored();
		}

		@Override
		public long getCapacity()
		{
			return getMaxEnergyStored();
		}
	}
}