/*
 * 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.block.misc;


import appeng.api.util.IOrientable;
import appeng.api.util.IOrientableBlock;
import appeng.block.AEBaseTileBlock;
import appeng.helpers.MetaRotation;
import appeng.tile.misc.TileLightDetector;
import net.minecraft.block.Block;
import net.minecraft.block.BlockState;
import net.minecraft.block.material.Material;
import net.minecraft.state.BooleanProperty;
import net.minecraft.state.StateContainer;
import net.minecraft.state.properties.BlockStateProperties;
import net.minecraft.util.Direction;
import net.minecraft.util.math.AxisAlignedBB;
import net.minecraft.util.math.BlockPos;
import net.minecraft.util.math.shapes.ISelectionContext;
import net.minecraft.util.math.shapes.VoxelShape;
import net.minecraft.util.math.shapes.VoxelShapes;
import net.minecraft.world.IBlockReader;
import net.minecraft.world.IWorld;
import net.minecraft.world.IWorldReader;
import net.minecraft.world.World;

import java.util.Random;


public class BlockLightDetector extends AEBaseTileBlock<TileLightDetector> implements IOrientableBlock
{

	// Used to alternate between two variants of the fixture on adjacent blocks
	public static final BooleanProperty ODD = BooleanProperty.create( "odd" );

	public BlockLightDetector()
	{
		super( defaultProps(Material.MISCELLANEOUS).notSolid() );

		this.setDefaultState( this.getDefaultState().with(BlockStateProperties.FACING, Direction.UP ).with( ODD, false ) );
	}

	@Override
	protected void fillStateContainer(StateContainer.Builder<Block, BlockState> builder) {
		super.fillStateContainer(builder);
		builder.add(BlockStateProperties.FACING);
		builder.add(ODD);
	}

	@Override
	public int getWeakPower( final BlockState state, final IBlockReader w, final BlockPos pos, final Direction side )
	{
		if( w instanceof World && this.getTileEntity( w, pos ).isReady() )
		{
			// FIXME: This is ... uhm... fishy
			return ( (World) w ).getLight( pos ) - 6;
		}

		return 0;
	}

	@Override
	public void onNeighborChange(BlockState state, IWorldReader world, BlockPos pos, BlockPos neighbor) {
		super.onNeighborChange( state, world, pos, neighbor );

		final TileLightDetector tld = this.getTileEntity( world, pos );
		if( tld != null )
		{
			tld.updateLight();
		}
	}

	@Override
	public void animateTick( final BlockState state, final World worldIn, final BlockPos pos, final Random rand )
	{
		// cancel out lightning
	}

	@Override
	public boolean isValidOrientation(final IWorld w, final BlockPos pos, final Direction forward, final Direction up )
	{
		return this.canPlaceAt( w, pos, up.getOpposite() );
	}

	private boolean canPlaceAt( final IBlockReader w, final BlockPos pos, final Direction dir )
	{
		final BlockPos test = pos.offset( dir );
		BlockState blockstate = w.getBlockState(test);
		return blockstate.isSolidSide(w, test, dir.getOpposite());
	}

	@Override
	public VoxelShape getShape(BlockState state, IBlockReader w, BlockPos pos, ISelectionContext context) {

		// FIXME: We should / rather MUST use state here because at startup, this gets called without a world

		final Direction up = this.getOrientable( w, pos ).getUp();
		final double xOff = -0.3 * up.getXOffset();
		final double yOff = -0.3 * up.getYOffset();
		final double zOff = -0.3 * up.getZOffset();
		return VoxelShapes.create( new AxisAlignedBB( xOff + 0.3, yOff + 0.3, zOff + 0.3, xOff + 0.7, yOff + 0.7, zOff + 0.7 ) );
	}

	@Override
	public VoxelShape getCollisionShape(BlockState state, IBlockReader worldIn, BlockPos pos, ISelectionContext context) {
		return VoxelShapes.empty();
	}

	@Override
	public void neighborChanged( BlockState state, World world, BlockPos pos, Block blockIn, BlockPos fromPos, boolean isMoving )
	{
		final Direction up = this.getOrientable( world, pos ).getUp();
		if( !this.canPlaceAt( world, pos, up.getOpposite() ) )
		{
			this.dropTorch( world, pos );
		}
	}

	private void dropTorch( final World w, final BlockPos pos )
	{
		final BlockState prev = w.getBlockState( pos );
		w.destroyBlock( pos, true );
		w.notifyBlockUpdate( pos, prev, w.getBlockState( pos ), 3 );
	}

	@Override
	public boolean isValidPosition(BlockState state, IWorldReader w, BlockPos pos)
	{
		for( final Direction dir : Direction.values() )
		{
			if( this.canPlaceAt( w, pos, dir ) )
			{
				return true;
			}
		}
		return false;
	}

	@Override
	public IOrientable getOrientable( final IBlockReader w, final BlockPos pos )
	{
		return new MetaRotation( w, pos, BlockStateProperties.FACING );
	}

}