package appeng.fluids.parts;


import java.util.Random;

import net.minecraft.entity.player.PlayerEntity;
import net.minecraft.item.ItemStack;
import net.minecraft.nbt.CompoundNBT;
import net.minecraft.tileentity.TileEntity;
import net.minecraft.util.Hand;
import net.minecraft.util.EnumParticleTypes;
import net.minecraft.util.ResourceLocation;
import net.minecraft.util.math.BlockPos;
import net.minecraft.util.math.Vec3d;
import net.minecraft.world.World;

import appeng.api.AEApi;
import appeng.api.config.RedstoneMode;
import appeng.api.config.Settings;
import appeng.api.networking.events.MENetworkChannelsChanged;
import appeng.api.networking.events.MENetworkEventSubscribe;
import appeng.api.networking.events.MENetworkPowerStatusChange;
import appeng.api.networking.security.IActionSource;
import appeng.api.networking.storage.IBaseMonitor;
import appeng.api.networking.storage.IStackWatcher;
import appeng.api.networking.storage.IStackWatcherHost;
import appeng.api.parts.IPartCollisionHelper;
import appeng.api.parts.IPartModel;
import appeng.api.storage.IMEMonitor;
import appeng.api.storage.IMEMonitorHandlerReceiver;
import appeng.api.storage.IStorageChannel;
import appeng.api.storage.channels.IFluidStorageChannel;
import appeng.api.storage.data.IAEFluidStack;
import appeng.api.storage.data.IAEStack;
import appeng.api.storage.data.IItemList;
import appeng.api.util.AECableType;
import appeng.api.util.AEPartLocation;
import appeng.api.util.IConfigManager;
import appeng.core.AppEng;
import appeng.core.sync.GuiBridge;
import appeng.fluids.util.AEFluidInventory;
import appeng.fluids.util.IAEFluidInventory;
import appeng.fluids.util.IAEFluidTank;
import appeng.items.parts.PartModels;
import appeng.me.GridAccessException;
import appeng.parts.PartModel;
import appeng.parts.automation.PartUpgradeable;
import appeng.util.IConfigManagerHost;
import appeng.util.Platform;


public class PartFluidLevelEmitter extends PartUpgradeable implements IStackWatcherHost, IConfigManagerHost, IAEFluidInventory, IMEMonitorHandlerReceiver<IAEFluidStack>
{
	@PartModels
	public static final ResourceLocation MODEL_BASE_OFF = new ResourceLocation( AppEng.MOD_ID, "part/level_emitter_base_off" );
	@PartModels
	public static final ResourceLocation MODEL_BASE_ON = new ResourceLocation( AppEng.MOD_ID, "part/level_emitter_base_on" );
	@PartModels
	public static final ResourceLocation MODEL_STATUS_OFF = new ResourceLocation( AppEng.MOD_ID, "part/level_emitter_status_off" );
	@PartModels
	public static final ResourceLocation MODEL_STATUS_ON = new ResourceLocation( AppEng.MOD_ID, "part/level_emitter_status_on" );
	@PartModels
	public static final ResourceLocation MODEL_STATUS_HAS_CHANNEL = new ResourceLocation( AppEng.MOD_ID, "part/level_emitter_status_has_channel" );

	public static final PartModel MODEL_OFF_OFF = new PartModel( MODEL_BASE_OFF, MODEL_STATUS_OFF );
	public static final PartModel MODEL_OFF_ON = new PartModel( MODEL_BASE_OFF, MODEL_STATUS_ON );
	public static final PartModel MODEL_OFF_HAS_CHANNEL = new PartModel( MODEL_BASE_OFF, MODEL_STATUS_HAS_CHANNEL );
	public static final PartModel MODEL_ON_OFF = new PartModel( MODEL_BASE_ON, MODEL_STATUS_OFF );
	public static final PartModel MODEL_ON_ON = new PartModel( MODEL_BASE_ON, MODEL_STATUS_ON );
	public static final PartModel MODEL_ON_HAS_CHANNEL = new PartModel( MODEL_BASE_ON, MODEL_STATUS_HAS_CHANNEL );

	private static final int FLAG_ON = 4;

	private boolean prevState = false;
	private long lastReportedValue = 0;
	private long reportingValue = 0;
	private IStackWatcher stackWatcher = null;
	private final AEFluidInventory config = new AEFluidInventory( this, 1 );

	public PartFluidLevelEmitter( ItemStack is )
	{
		super( is );

		this.getConfigManager().registerSetting( Settings.REDSTONE_EMITTER, RedstoneMode.HIGH_SIGNAL );
	}

	public long getReportingValue()
	{
		return this.reportingValue;
	}

	public void setReportingValue( final long v )
	{
		this.reportingValue = v;
		this.updateState();
	}

	@Override
	public void updateSetting( IConfigManager manager, Enum settingName, Enum newValue )
	{
		this.configureWatchers();
	}

	@Override
	public void updateWatcher( IStackWatcher newWatcher )
	{
		this.stackWatcher = newWatcher;
		this.configureWatchers();
	}

	@Override
	public void onStackChange( IItemList<?> o, IAEStack<?> fullStack, IAEStack<?> diffStack, IActionSource src, IStorageChannel<?> chan )
	{
		if( chan == Api.INSTANCE.storage().getStorageChannel( IFluidStorageChannel.class ) && fullStack.equals( this.config.getFluidInSlot( 0 ) ) )
		{
			this.lastReportedValue = fullStack.getStackSize();
			this.updateState();
		}
	}

	@Override
	public void onFluidInventoryChanged( IAEFluidTank inv, int slot )
	{
		this.configureWatchers();
	}

	@MENetworkEventSubscribe
	public void channelChanged( final MENetworkChannelsChanged c )
	{
		this.updateState();
	}

	@MENetworkEventSubscribe
	public void powerChanged( final MENetworkPowerStatusChange c )
	{
		this.updateState();
	}

	@Override
	public int isProvidingStrongPower()
	{
		return this.prevState ? 15 : 0;
	}

	@Override
	public int isProvidingWeakPower()
	{
		return this.prevState ? 15 : 0;
	}

	@Override
	protected int populateFlags( final int cf )
	{
		return cf | ( this.prevState ? FLAG_ON : 0 );
	}

	@Override
	public boolean isValid( final Object effectiveGrid )
	{
		try
		{
			return this.getProxy().getGrid() == effectiveGrid;
		}
		catch( final GridAccessException e )
		{
			return false;
		}
	}

	@Override
	public void postChange( final IBaseMonitor<IAEFluidStack> monitor, final Iterable<IAEFluidStack> change, final IActionSource actionSource )
	{
		this.updateReportingValue( (IMEMonitor<IAEFluidStack>) monitor );
	}

	@Override
	public void onListUpdate()
	{
		try
		{
			final IStorageChannel<IAEFluidStack> channel = Api.INSTANCE.storage().getStorageChannel( IFluidStorageChannel.class );
			final IMEMonitor<IAEFluidStack> inventory = this.getProxy().getStorage().getInventory( channel );

			this.updateReportingValue( inventory );
		}
		catch( final GridAccessException e )
		{
			// ;P
		}
	}

	private void updateState()
	{
		final boolean isOn = this.isLevelEmitterOn();
		if( this.prevState != isOn )
		{
			this.getHost().markForUpdate();
			final TileEntity te = this.getHost().getTile();
			this.prevState = isOn;
			Platform.notifyBlocksOfNeighbors( te.getWorld(), te.getPos() );
			Platform.notifyBlocksOfNeighbors( te.getWorld(), te.getPos().offset( this.getSide().getFacing() ) );
		}
	}

	private void configureWatchers()
	{
		final IFluidStorageChannel channel = Api.INSTANCE.storage().getStorageChannel( IFluidStorageChannel.class );

		if( this.stackWatcher != null )
		{
			this.stackWatcher.reset();

			final IAEFluidStack myStack = this.config.getFluidInSlot( 0 );

			try
			{
				if( myStack != null )
				{
					this.getProxy().getStorage().getInventory( channel ).removeListener( this );
					this.stackWatcher.add( myStack );
				}
				else
				{
					this.getProxy()
							.getStorage()
							.getInventory( channel )
							.addListener( this, this.getProxy().getGrid() );
				}

				final IMEMonitor<IAEFluidStack> inventory = this.getProxy().getStorage().getInventory( channel );

				this.updateReportingValue( inventory );
			}
			catch( GridAccessException e )
			{
				// NOP
			}
		}
	}

	private void updateReportingValue( final IMEMonitor<IAEFluidStack> monitor )
	{
		final IAEFluidStack myStack = this.config.getFluidInSlot( 0 );

		if( myStack == null )
		{
			this.lastReportedValue = 0;
			for( final IAEFluidStack st : monitor.getStorageList() )
			{
				this.lastReportedValue += st.getStackSize();
			}
		}
		else
		{
			final IAEFluidStack r = monitor.getStorageList().findPrecise( myStack );
			if( r == null )
			{
				this.lastReportedValue = 0;
			}
			else
			{
				this.lastReportedValue = r.getStackSize();
			}
		}
		this.updateState();
	}

	private boolean isLevelEmitterOn()
	{
		if( Platform.isClient() )
		{
			return ( this.getClientFlags() & FLAG_ON ) == FLAG_ON;
		}

		if( !this.getProxy().isActive() )
		{
			return false;
		}

		final boolean flipState = this.getConfigManager().getSetting( Settings.REDSTONE_EMITTER ) == RedstoneMode.LOW_SIGNAL;
		return flipState ? this.reportingValue > this.lastReportedValue : this.reportingValue <= this.lastReportedValue;
	}

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

	@Override
	public float getCableConnectionLength( AECableType cable )
	{
		return 16;
	}

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

	@Override
	public void getBoxes( final IPartCollisionHelper bch )
	{
		bch.addBox( 7, 7, 11, 9, 9, 16 );
	}

	@Override
	public void animateTick( final World world, final BlockPos pos, final Random r )
	{
		if( this.isLevelEmitterOn() )
		{
			final AEPartLocation d = this.getSide();

			final double d0 = d.xOffset * 0.45F + ( r.nextFloat() - 0.5F ) * 0.2D;
			final double d1 = d.yOffset * 0.45F + ( r.nextFloat() - 0.5F ) * 0.2D;
			final double d2 = d.zOffset * 0.45F + ( r.nextFloat() - 0.5F ) * 0.2D;

			world.spawnParticle( EnumParticleTypes.REDSTONE, 0.5 + pos.getX() + d0, 0.5 + pos.getY() + d1, 0.5 + pos.getZ() + d2, 0.0D, 0.0D, 0.0D,
					new int[0] );
		}
	}

	@Override
	public boolean onPartActivate( final PlayerEntity player, final Hand hand, final Vec3d pos )
	{
		if( Platform.isServer() )
		{
			Platform.openGUI( player, this.getHost().getTile(), this.getSide(), GuiBridge.GUI_FLUID_LEVEL_EMITTER );
		}
		return true;
	}

	@Override
	public IPartModel getStaticModels()
	{
		if( this.isActive() && this.isPowered() )
		{
			return this.isLevelEmitterOn() ? MODEL_ON_HAS_CHANNEL : MODEL_OFF_HAS_CHANNEL;
		}
		else if( this.isPowered() )
		{
			return this.isLevelEmitterOn() ? MODEL_ON_ON : MODEL_OFF_ON;
		}
		else
		{
			return this.isLevelEmitterOn() ? MODEL_ON_OFF : MODEL_OFF_OFF;
		}
	}

	public IAEFluidTank getConfig()
	{
		return this.config;
	}

	@Override
	public void readFromNBT( final CompoundNBT data )
	{
		super.readFromNBT( data );
		this.lastReportedValue = data.getLong( "lastReportedValue" );
		this.reportingValue = data.getLong( "reportingValue" );
		this.prevState = data.getBoolean( "prevState" );
		this.config.readFromNBT( data, "config" );
	}

	@Override
	public void writeToNBT( final CompoundNBT data )
	{
		super.writeToNBT( data );
		data.putLong( "lastReportedValue", this.lastReportedValue );
		data.putLong( "reportingValue", this.reportingValue );
		data.putBoolean("prevState", this.prevState);
		this.config.writeToNBT( data, "config" );
	}

}