/*
 * This file is part of Applied Energistics 2.
 * Copyright (c) 2013 - 2015, 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.services.compass;


import java.io.File;
import java.util.HashMap;
import java.util.Map;

import javax.annotation.Nonnull;

import com.google.common.base.Preconditions;


public final class CompassReader
{
	private final Map<Long, CompassRegion> regions = new HashMap<Long, CompassRegion>( 100 );
	private final int dimensionId;
	private final File worldCompassFolder;

	public CompassReader( final int dimensionId, @Nonnull final File worldCompassFolder )
	{
		Preconditions.checkNotNull( worldCompassFolder );
		Preconditions.checkArgument( worldCompassFolder.isDirectory() );

		this.dimensionId = dimensionId;
		this.worldCompassFolder = worldCompassFolder;
	}

	public void close()
	{
		for( final CompassRegion r : this.regions.values() )
		{
			r.close();
		}

		this.regions.clear();
	}

	public void setHasBeacon( final int cx, final int cz, final int cdy, final boolean hasBeacon )
	{
		final CompassRegion r = this.getRegion( cx, cz );

		r.setHasBeacon( cx, cz, cdy, hasBeacon );
	}

	public boolean hasBeacon( final int cx, final int cz )
	{
		final CompassRegion r = this.getRegion( cx, cz );

		return r.hasBeacon( cx, cz );
	}

	private CompassRegion getRegion( final int cx, final int cz )
	{
		long pos = cx >> 10;
		pos <<= 32;
		pos |= ( cz >> 10 );

		CompassRegion cr = this.regions.get( pos );

		if( cr == null )
		{
			cr = new CompassRegion( cx, cz, this.dimensionId, this.worldCompassFolder );
			this.regions.put( pos, cr );
		}

		return cr;
	}
}