package appeng.parts.automation;


import net.minecraft.item.ItemStack;
import net.minecraft.nbt.CompoundNBT;
import net.minecraft.tileentity.TileEntity;
import net.minecraft.util.Direction;
import net.minecraft.util.math.BlockPos;
import net.minecraft.world.IBlockReader;

import appeng.api.config.Actionable;
import appeng.api.networking.security.IActionSource;
import appeng.api.parts.IPart;
import appeng.api.parts.IPartCollisionHelper;
import appeng.api.parts.IPartHost;
import appeng.api.storage.ICellContainer;
import appeng.api.storage.ICellInventory;
import appeng.api.storage.IMEInventory;
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.helpers.IPriorityHost;


public abstract class PartAbstractFormationPlane<T extends IAEStack<T>> extends PartUpgradeable implements ICellContainer, IPriorityHost, IMEInventory<T>
{

	private boolean wasActive = false;
	private int priority = 0;
	protected boolean blocked = false;

	public PartAbstractFormationPlane( ItemStack is )
	{
		super( is );
	}

	protected abstract void updateHandler();

	@Override
	protected int getUpgradeSlots()
	{
		return 5;
	}

	@Override
	public void upgradesChanged()
	{
		this.updateHandler();
	}

	@Override
	public void updateSetting( final IConfigManager manager, final Enum settingName, final Enum newValue )
	{
		this.updateHandler();
		this.getHost().markForSave();
	}

	public void stateChanged()
	{
		final boolean currentActive = this.getProxy().isActive();
		if( this.wasActive != currentActive )
		{
			this.wasActive = currentActive;
			this.updateHandler();
			this.getHost().markForUpdate();
		}
	}

	@Override
	public void getBoxes( final IPartCollisionHelper bch )
	{
		int minX = 1;
		int minY = 1;
		int maxX = 15;
		int maxY = 15;

		final IPartHost host = this.getHost();
		if( host != null )
		{
			final TileEntity te = host.getTile();

			final BlockPos pos = te.getPos();

			final Direction e = bch.getWorldX();
			final Direction u = bch.getWorldY();

			if( this.isTransitionPlane( te.getWorld().getTileEntity( pos.offset( e.getOpposite() ) ), this.getSide() ) )
			{
				minX = 0;
			}

			if( this.isTransitionPlane( te.getWorld().getTileEntity( pos.offset( e ) ), this.getSide() ) )
			{
				maxX = 16;
			}

			if( this.isTransitionPlane( te.getWorld().getTileEntity( pos.offset( u.getOpposite() ) ), this.getSide() ) )
			{
				minY = 0;
			}

			if( this.isTransitionPlane( te.getWorld().getTileEntity( pos.offset( u ) ), this.getSide() ) )
			{
				maxY = 16;
			}
		}

		bch.addBox( 5, 5, 14, 11, 11, 15 );
		bch.addBox( minX, minY, 15, maxX, maxY, 16 );
	}

	public PlaneConnections getConnections()
	{

		final Direction facingRight, facingUp;
		AEPartLocation location = this.getSide();
		switch( location )
		{
			case UP:
				facingRight = Direction.EAST;
				facingUp = Direction.NORTH;
				break;
			case DOWN:
				facingRight = Direction.WEST;
				facingUp = Direction.NORTH;
				break;
			case NORTH:
				facingRight = Direction.WEST;
				facingUp = Direction.UP;
				break;
			case SOUTH:
				facingRight = Direction.EAST;
				facingUp = Direction.UP;
				break;
			case WEST:
				facingRight = Direction.SOUTH;
				facingUp = Direction.UP;
				break;
			case EAST:
				facingRight = Direction.NORTH;
				facingUp = Direction.UP;
				break;
			default:
			case INTERNAL:
				return PlaneConnections.of( false, false, false, false );
		}

		boolean left = false, right = false, down = false, up = false;

		final IPartHost host = this.getHost();
		if( host != null )
		{
			final TileEntity te = host.getTile();

			final BlockPos pos = te.getPos();

			if( this.isTransitionPlane( te.getWorld().getTileEntity( pos.offset( facingRight.getOpposite() ) ), this.getSide() ) )
			{
				left = true;
			}

			if( this.isTransitionPlane( te.getWorld().getTileEntity( pos.offset( facingRight ) ), this.getSide() ) )
			{
				right = true;
			}

			if( this.isTransitionPlane( te.getWorld().getTileEntity( pos.offset( facingUp.getOpposite() ) ), this.getSide() ) )
			{
				down = true;
			}

			if( this.isTransitionPlane( te.getWorld().getTileEntity( pos.offset( facingUp ) ), this.getSide() ) )
			{
				up = true;
			}
		}

		return PlaneConnections.of( up, right, down, left );
	}

	@Override
	public void onNeighborChanged( IBlockReader w, BlockPos pos, BlockPos neighbor )
	{
		if( pos.offset( this.getSide().getFacing() ).equals( neighbor ) )
		{
			final TileEntity te = this.getHost().getTile();
			final AEPartLocation side = this.getSide();

			final BlockPos tePos = te.getPos().offset( side.getFacing() );

			this.blocked = !w.getBlockState( tePos ).getBlock().isReplaceable( w, tePos );
		}
	}

	@Override
	public float getCableConnectionLength( AECableType cable )
	{
		return 1;
	}

	protected boolean isTransitionPlane( final TileEntity blockTileEntity, final AEPartLocation side )
	{
		if( blockTileEntity instanceof IPartHost )
		{
			final IPart p = ( (IPartHost) blockTileEntity ).getPart( side );
			return p != null && this.getClass() == p.getClass();
		}
		return false;
	}

	@Override
	public T extractItems( final T request, final Actionable mode, final IActionSource src )
	{
		return null;
	}

	@Override
	public IItemList<T> getAvailableItems( final IItemList<T> out )
	{
		return out;
	}

	@Override
	public void readFromNBT( final CompoundNBT data )
	{
		super.readFromNBT( data );
		this.priority = data.getInt( "priority" );
	}

	@Override
	public void writeToNBT( final CompoundNBT data )
	{
		super.writeToNBT( data );
		data.putInt( "priority", this.getPriority() );
	}

	@Override
	public int getPriority()
	{
		return this.priority;
	}

	@Override
	public void setPriority( final int newValue )
	{
		this.priority = newValue;
		this.getHost().markForSave();
		this.updateHandler();
	}

	@Override
	public void blinkCell( final int slot )
	{
		// :P
	}

	@Override
	public void saveChanges( final ICellInventory<?> cell )
	{
		// nope!
	}
}