/*******************************************************************************
 * Copyright (c) 2012 Association for Decentralized Information Management
 * in Industry THTH ry.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     VTT Technical Research Centre of Finland - initial API and implementation
 *******************************************************************************/
package org.simantics.maps.eclipse;

import java.awt.Image;
import java.util.HashSet;
import java.util.Hashtable;
import java.util.Map;
import java.util.Set;

import org.simantics.maps.query.IQueryListener;
import org.simantics.maps.query.Query;
import org.simantics.maps.tile.IFilter;
import org.simantics.maps.tile.ITileJobQueue;
import org.simantics.maps.tile.ITileListener;
import org.simantics.maps.tile.ITileProvider;
import org.simantics.maps.tile.TileKey;

/**
 * @author Tuukka Lehtonen
 * @see TileJob
 */
public class TileJobQueue implements ITileJobQueue {

    private ITileProvider provider;

    private Map<TileKey, TileJob> queries = new Hashtable<TileKey, TileJob>();

    public TileJobQueue() {
    }

    public void setTileProvider(ITileProvider provider) {
        this.provider = provider;
    }

    public void addJob(Query<TileKey, Image> job) {
        TileJob tj = new TileJob(job, provider);
        queries.put(job.source, tj);
        tj.schedule();
    }

    public void addAsFirstJob(Query<TileKey, Image> job) {
        TileJob tj = new TileJob(job, provider);
        queries.put(job.source, tj);
        tj.schedule();
    }

    public void removeJob(Query<TileKey, Image> job) {
        TileJob t = queries.remove(job.source);
        if(t != null) {
            t.cancel();
        }
    }

    @Override
    public void addJob(final TileKey key, final ITileListener listener) {
        addJob(new Query<TileKey, Image>(key, new IQueryListener<TileKey, Image>() {
            @Override
            public void queryCanceled(Query<TileKey, Image> job) {
                listener.tileCanceled(key);
            }
            @Override
            public void queryFailed(Query<TileKey, Image> job, Exception error) {
                listener.tileFailed(key, error);
            }
            @Override
            public void queryComplete(Query<TileKey, Image> job, Image result) {
                listener.tileUpdated(key, result);
            }
        }));
    }

    @Override
    public void filterQueries(IFilter<TileKey> filter) {
        Set<TileKey> keys = new HashSet<TileKey>(queries.keySet());
        for(TileKey key : keys) {
            if (!filter.select(key)) {
                TileJob t = queries.remove(key);
                if(t != null) {
                    t.cancel();
                    t.getQuery().listener.queryCanceled(t.getQuery());
                }
            }
        }
    }

}