/*
 * 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.tile.networking;


import net.minecraft.nbt.NBTTagCompound;

import appeng.api.config.AccessRestriction;
import appeng.api.config.Actionable;
import appeng.api.config.PowerMultiplier;
import appeng.api.networking.energy.IAEPowerStorage;
import appeng.api.networking.events.MENetworkPowerStorage;
import appeng.api.networking.events.MENetworkPowerStorage.PowerEventType;
import appeng.api.util.AECableType;
import appeng.api.util.AEPartLocation;
import appeng.block.networking.BlockEnergyCell;
import appeng.me.GridAccessException;
import appeng.tile.TileEvent;
import appeng.tile.events.TileEventType;
import appeng.tile.grid.AENetworkTile;
import appeng.util.SettingsFrom;


public class TileEnergyCell extends AENetworkTile implements IAEPowerStorage
{

	private double internalCurrentPower = 0.0;
	private double internalMaxPower = 200000.0;

	private byte currentMeta = -1;

	public TileEnergyCell()
	{
		this.getProxy().setIdlePowerUsage( 0 );
	}

	@Override
	public AECableType getCableConnectionType( final AEPartLocation dir )
	{
		return AECableType.COVERED;
	}

	@Override
	public void onReady()
	{
		super.onReady();
		final int value = this.worldObj.getBlockState( this.pos ).getValue( BlockEnergyCell.ENERGY_STORAGE );
		this.currentMeta = (byte) value;
		this.changePowerLevel();
	}

	/**
	 * Given a fill factor, return the storage level (0-7) used for the state of the block.
	 * This is also used for determining the item model.
	 */
	public static int getStorageLevelFromFillFactor( double fillFactor ) {
		byte boundMetadata = (byte) ( 8.0 * ( fillFactor ) );

		if( boundMetadata > 7 )
		{
			boundMetadata = 7;
		}
		if( boundMetadata < 0 )
		{
			boundMetadata = 0;
		}
		return boundMetadata;
	}

	private void changePowerLevel()
	{
		if( this.notLoaded() )
		{
			return;
		}

		int storageLevel = getStorageLevelFromFillFactor( this.internalCurrentPower / this.getInternalMaxPower() );

		if( this.currentMeta != storageLevel )
		{
			this.currentMeta = (byte) storageLevel;
			this.worldObj.setBlockState( this.pos, this.worldObj.getBlockState( this.pos ).withProperty( BlockEnergyCell.ENERGY_STORAGE, storageLevel ) );
		}
	}

	@TileEvent( TileEventType.WORLD_NBT_WRITE )
	public void writeToNBT_TileEnergyCell( final NBTTagCompound data )
	{
		if( !this.worldObj.isRemote )
		{
			data.setDouble( "internalCurrentPower", this.internalCurrentPower );
		}
	}

	@TileEvent( TileEventType.WORLD_NBT_READ )
	public void readFromNBT_TileEnergyCell( final NBTTagCompound data )
	{
		this.internalCurrentPower = data.getDouble( "internalCurrentPower" );
	}

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

	@Override
	public void uploadSettings( final SettingsFrom from, final NBTTagCompound compound )
	{
		if( from == SettingsFrom.DISMANTLE_ITEM )
		{
			this.internalCurrentPower = compound.getDouble( "internalCurrentPower" );
		}
	}

	@Override
	public NBTTagCompound downloadSettings( final SettingsFrom from )
	{
		if( from == SettingsFrom.DISMANTLE_ITEM )
		{
			final NBTTagCompound tag = new NBTTagCompound();
			tag.setDouble( "internalCurrentPower", this.internalCurrentPower );
			tag.setDouble( "internalMaxPower", this.getInternalMaxPower() ); // used for tool tip.
			return tag;
		}
		return null;
	}

	@Override
	public final double injectAEPower( double amt, final Actionable mode )
	{
		if( mode == Actionable.SIMULATE )
		{
			final double fakeBattery = this.internalCurrentPower + amt;
			if( fakeBattery > this.getInternalMaxPower() )
			{
				return fakeBattery - this.getInternalMaxPower();
			}

			return 0;
		}

		if( this.internalCurrentPower < 0.01 && amt > 0.01 )
		{
			this.getProxy().getNode().getGrid().postEvent( new MENetworkPowerStorage( this, PowerEventType.PROVIDE_POWER ) );
		}

		this.internalCurrentPower += amt;
		if( this.internalCurrentPower > this.getInternalMaxPower() )
		{
			amt = this.internalCurrentPower - this.getInternalMaxPower();
			this.internalCurrentPower = this.getInternalMaxPower();

			this.changePowerLevel();
			return amt;
		}

		this.changePowerLevel();
		return 0;
	}

	@Override
	public double getAEMaxPower()
	{
		return this.getInternalMaxPower();
	}

	@Override
	public double getAECurrentPower()
	{
		return this.internalCurrentPower;
	}

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

	@Override
	public AccessRestriction getPowerFlow()
	{
		return AccessRestriction.READ_WRITE;
	}

	@Override
	public final double extractAEPower( final double amt, final Actionable mode, final PowerMultiplier pm )
	{
		return pm.divide( this.extractAEPower( pm.multiply( amt ), mode ) );
	}

	private double extractAEPower( double amt, final Actionable mode )
	{
		if( mode == Actionable.SIMULATE )
		{
			if( this.internalCurrentPower > amt )
			{
				return amt;
			}
			return this.internalCurrentPower;
		}

		final boolean wasFull = this.internalCurrentPower >= this.getInternalMaxPower() - 0.001;

		if( wasFull && amt > 0.001 )
		{
			try
			{
				this.getProxy().getGrid().postEvent( new MENetworkPowerStorage( this, PowerEventType.REQUEST_POWER ) );
			}
			catch( final GridAccessException ignored )
			{

			}
		}

		if( this.internalCurrentPower > amt )
		{
			this.internalCurrentPower -= amt;

			this.changePowerLevel();
			return amt;
		}

		amt = this.internalCurrentPower;
		this.internalCurrentPower = 0;

		this.changePowerLevel();
		return amt;
	}

	private double getInternalMaxPower()
	{
		return this.internalMaxPower;
	}

	void setInternalMaxPower( final double internalMaxPower )
	{
		this.internalMaxPower = internalMaxPower;
	}
}