/* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde
 * Software engineering by Intevation GmbH
 *
 * This file is Free Software under the GNU AGPL (>=v3)
 * and comes with ABSOLUTELY NO WARRANTY! Check out the
 * documentation coming with Dive4Elements River for details.
 */

package org.dive4elements.river.artifacts.states.sq;

import java.util.Date;
import java.util.List;
import java.util.Collections;

import org.apache.log4j.Logger;

import org.w3c.dom.Element;

import org.dive4elements.river.artifacts.states.PeriodsSelect;
import org.dive4elements.river.artifacts.access.RangeAccess;
import org.dive4elements.river.artifacts.D4EArtifact;
import org.dive4elements.river.artifacts.model.SQOverview;
import org.dive4elements.river.artifacts.model.SQOverviewFactory;
import org.dive4elements.river.artifacts.model.SQOverview.KmFilter;

import org.dive4elements.river.utils.KMIndex;

import org.dive4elements.artifacts.common.utils.XMLUtils;
import org.dive4elements.artifacts.Artifact;
import org.dive4elements.artifacts.CallContext;

import org.dive4elements.artifactdatabase.data.StateData;

public class SQPeriodSelect extends PeriodsSelect {

    private static Logger log = Logger.getLogger(SQPeriodSelect.class);

    public static final String UI_PROVIDER = "sq.period.select";

    private static final long serialVersionUID = 1L;

    /** Get either the start date of the data or the end. */
    protected long getDataMinMaxDate(Artifact artifact, boolean minDate) {
        D4EArtifact arti = (D4EArtifact) artifact;
        RangeAccess access = new RangeAccess(arti);
        double km = access.getLocations()[0];

        /* Bit of an overkill here but it will be cached and accessed
         * in the next state anyway. */
        SQOverview overview = SQOverviewFactory.getOverview(access.getRiverName());

        KMIndex<List<Date>> entries = overview.filter(new KmFilter(km));
        if (entries.size() == 0) {
            return 0;
        }
        List<Date> dates = entries.get(0).getValue();
        if (dates.isEmpty()) {
            return 0;
        }
        Collections.sort(dates);

        return minDate ? dates.get(0).getTime() : dates.get(dates.size() - 1).getTime();
    }

    @Override
    protected Element[] createItems(
        XMLUtils.ElementCreator cr,
        Artifact    artifact,
        String      name,
        CallContext context)
    {
        if (!name.equals("start") && !name.equals("end")) {
            return null;
        }
        Element def = createItem(
            cr,
            new String[] {"default", Long.toString(
                getDataMinMaxDate(artifact, name.equals("start")))});

        return new Element[] { def };
    }

    @Override
    public String getUIProvider() {
        return UI_PROVIDER;
    }
}
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