package de.intevation.flys.importer;

import java.util.List;

import org.apache.log4j.Logger;

import org.hibernate.Session;
import org.hibernate.Query;

import de.intevation.flys.model.WaterlevelDifferenceColumn;
import de.intevation.flys.model.WaterlevelDifferenceValue;


public class ImportWaterlevelDifferenceValue {

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


    private Double station;
    private Double value;

    private WaterlevelDifferenceValue peer;


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


    public void storeDependencies(WaterlevelDifferenceColumn column) {
        getPeer(column);
    }


    /** Get the (usually W/cm) value. */
    public Double getValue() {
        return value;
    }


    /** Get the (km) station. */
    public Double getStation() {
        return station;
    }


    public WaterlevelDifferenceValue getPeer(WaterlevelDifferenceColumn column) {
        if (peer == null) {
            Session session = ImporterSession.getInstance().getDatabaseSession();
            Query query = session.createQuery(
                "from WaterlevelDifferenceValue where " +
                "   column=:column and " +
                "   station=:station and " +
                "   value=:value"
            );

            query.setParameter("column", column);
            query.setParameter("station", station);
            query.setParameter("value", value);

            List<WaterlevelDifferenceValue> values = query.list();
            if (values.isEmpty()) {
                peer = new WaterlevelDifferenceValue(column, station, value);
                session.save(peer);
            }
            else {
                peer = values.get(0);
            }
        }

        return peer;
    }
}
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