/* 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.apache.log4j.Logger;
import org.dive4elements.river.model.ElevationModel;
import org.hibernate.Query;
import org.hibernate.Session;


public class ImportElevationModel {

    private static final Logger log =
            Logger.getLogger(ImportElevationModel.class);

    protected String name;

    protected ImportUnit unit;

    protected ElevationModel peer;


    public ImportElevationModel(final String name, final ImportUnit unit) {
        this.name = name;
        this.unit = unit;
    }


    public void storeDependencies() {
        final ElevationModel model = getPeer();
    }

    public ElevationModel getPeer() {
        if (this.unit == null) {
            log.warn("No elevation model specified.");
            return null;
        }
        if (this.peer != null)
            return this.peer;

        final Session session = ImporterSession.getInstance().getDatabaseSession();
        final Query query = session.createQuery("FROM ElevationModel WHERE (trim(name)=:name) AND (unit=:unit)");
        query.setParameter("name", this.name);
        query.setParameter("unit", this.unit.getPeer());
        final List<ElevationModel> models = query.list();

        if (models.isEmpty()) {
            log.info("Create new ElevationModel DB instance.");

            this.peer = new ElevationModel(this.name, this.unit.getPeer());
            session.save(this.peer);
        }
        else {
            this.peer = models.get(0);
        }
        return this.peer;
    }
}
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