/*
 * 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.parts;


import java.util.List;

import net.minecraft.entity.Entity;
import net.minecraft.util.EnumFacing;
import net.minecraft.util.math.AxisAlignedBB;

import appeng.api.parts.IPartCollisionHelper;
import appeng.api.util.AEPartLocation;


public class BusCollisionHelper implements IPartCollisionHelper
{

	private final List<AxisAlignedBB> boxes;

	private final EnumFacing x;
	private final EnumFacing y;
	private final EnumFacing z;

	private final Entity entity;
	private final boolean isVisual;

	public BusCollisionHelper( final List<AxisAlignedBB> boxes, final EnumFacing x, final EnumFacing y, final EnumFacing z, final Entity e, final boolean visual )
	{
		this.boxes = boxes;
		this.x = x;
		this.y = y;
		this.z = z;
		this.entity = e;
		this.isVisual = visual;
	}

	public BusCollisionHelper( final List<AxisAlignedBB> boxes, final AEPartLocation s, final Entity e, final boolean visual )
	{
		this.boxes = boxes;
		this.entity = e;
		this.isVisual = visual;

		switch( s )
		{
			case DOWN:
				this.x = EnumFacing.EAST;
				this.y = EnumFacing.NORTH;
				this.z = EnumFacing.DOWN;
				break;
			case UP:
				this.x = EnumFacing.EAST;
				this.y = EnumFacing.SOUTH;
				this.z = EnumFacing.UP;
				break;
			case EAST:
				this.x = EnumFacing.SOUTH;
				this.y = EnumFacing.UP;
				this.z = EnumFacing.EAST;
				break;
			case WEST:
				this.x = EnumFacing.NORTH;
				this.y = EnumFacing.UP;
				this.z = EnumFacing.WEST;
				break;
			case NORTH:
				this.x = EnumFacing.WEST;
				this.y = EnumFacing.UP;
				this.z = EnumFacing.NORTH;
				break;
			case SOUTH:
				this.x = EnumFacing.EAST;
				this.y = EnumFacing.UP;
				this.z = EnumFacing.SOUTH;
				break;
			case INTERNAL:
			default:
				this.x = EnumFacing.EAST;
				this.y = EnumFacing.UP;
				this.z = EnumFacing.SOUTH;
				break;
		}
	}

	/**
	 * pretty much useless...
	 */
	public Entity getEntity()
	{
		return this.entity;
	}

	@Override
	public void addBox( double minX, double minY, double minZ, double maxX, double maxY, double maxZ )
	{
		minX /= 16.0;
		minY /= 16.0;
		minZ /= 16.0;
		maxX /= 16.0;
		maxY /= 16.0;
		maxZ /= 16.0;

		double aX = minX * this.x.getFrontOffsetX() + minY * this.y.getFrontOffsetX() + minZ * this.z.getFrontOffsetX();
		double aY = minX * this.x.getFrontOffsetY() + minY * this.y.getFrontOffsetY() + minZ * this.z.getFrontOffsetY();
		double aZ = minX * this.x.getFrontOffsetZ() + minY * this.y.getFrontOffsetZ() + minZ * this.z.getFrontOffsetZ();

		double bX = maxX * this.x.getFrontOffsetX() + maxY * this.y.getFrontOffsetX() + maxZ * this.z.getFrontOffsetX();
		double bY = maxX * this.x.getFrontOffsetY() + maxY * this.y.getFrontOffsetY() + maxZ * this.z.getFrontOffsetY();
		double bZ = maxX * this.x.getFrontOffsetZ() + maxY * this.y.getFrontOffsetZ() + maxZ * this.z.getFrontOffsetZ();

		if( this.x.getFrontOffsetX() + this.y.getFrontOffsetX() + this.z.getFrontOffsetX() < 0 )
		{
			aX += 1;
			bX += 1;
		}

		if( this.x.getFrontOffsetY() + this.y.getFrontOffsetY() + this.z.getFrontOffsetY() < 0 )
		{
			aY += 1;
			bY += 1;
		}

		if( this.x.getFrontOffsetZ() + this.y.getFrontOffsetZ() + this.z.getFrontOffsetZ() < 0 )
		{
			aZ += 1;
			bZ += 1;
		}

		minX = Math.min( aX, bX );
		minY = Math.min( aY, bY );
		minZ = Math.min( aZ, bZ );
		maxX = Math.max( aX, bX );
		maxY = Math.max( aY, bY );
		maxZ = Math.max( aZ, bZ );

		this.boxes.add( new AxisAlignedBB( minX, minY, minZ, maxX, maxY, maxZ ) );
	}

	@Override
	public EnumFacing getWorldX()
	{
		return this.x;
	}

	@Override
	public EnumFacing getWorldY()
	{
		return this.y;
	}

	@Override
	public EnumFacing getWorldZ()
	{
		return this.z;
	}

	@Override
	public boolean isBBCollision()
	{
		return !this.isVisual;
	}
}