/* 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.importer;

import java.util.List;

import org.dive4elements.river.importer.common.StoreMode;
import org.dive4elements.river.model.SedimentLoadLS;
import org.dive4elements.river.model.SedimentLoadLSValue;
import org.hibernate.Query;
import org.hibernate.Session;


public class ImportSedimentLoadLSValue {

    private final Double station;
    private final Double value;

    private SedimentLoadLSValue peer;


    public ImportSedimentLoadLSValue(final Double station, final Double value) {
        this.station = station;
        this.value   = value;
    }


    public void storeDependencies(final SedimentLoadLS sedimentLoadLS, final StoreMode parentStoreMode) {
        getPeer(sedimentLoadLS, parentStoreMode);
    }


    public SedimentLoadLSValue getPeer(final SedimentLoadLS sedimentLoadLS, final StoreMode parentStoreMode) {
        if (this.peer == null) {
            List<SedimentLoadLSValue> values;
            final Session session = ImporterSession.getInstance().getDatabaseSession();
            if (parentStoreMode == StoreMode.INSERT)
                values = null;
            else {
                final Query query = session.createQuery(
                        "from SedimentLoadLSValue where " +
                                "   sedimentLoadLS=:sedimentLoadLS and " +
                                "   station=:station and " +
                                "   value=:value"
                        );
                query.setParameter("sedimentLoadLS", sedimentLoadLS);
                query.setParameter("station", this.station);
                query.setParameter("value", this.value);
                values = query.list();
            }
            if ((values == null) || values.isEmpty()) {
                this.peer = new SedimentLoadLSValue(sedimentLoadLS, this.station, this.value);
                session.save(this.peer);
            }
            else {
                this.peer = values.get(0);
            }
        }

        return this.peer;
    }
}
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