package de.intevation.flys.importer;

import java.math.BigDecimal;
import java.sql.SQLException;
import java.util.List;

import org.hibernate.Session;
import org.hibernate.Query;
import org.hibernate.exception.ConstraintViolationException;

import de.intevation.flys.model.FlowVelocityModel;
import de.intevation.flys.model.FlowVelocityModelValue;


public class ImportFlowVelocityModelValue {

    private BigDecimal station;
    private BigDecimal totalChannel;
    private BigDecimal mainChannel;
    private BigDecimal shearStress;

    private FlowVelocityModelValue peer;


    public ImportFlowVelocityModelValue(
        BigDecimal station,
        BigDecimal totalChannel,
        BigDecimal mainChannel,
        BigDecimal shearStress
    ) {
        this.station      = station;
        this.totalChannel = totalChannel;
        this.mainChannel  = mainChannel;
        this.shearStress  = shearStress;
    }


    public void storeDependencies(FlowVelocityModel model)
    throws SQLException, ConstraintViolationException
    {
        getPeer(model);
    }


    public FlowVelocityModelValue getPeer(FlowVelocityModel model) {
        if (peer == null) {
            Session session = ImporterSession.getInstance().getDatabaseSession();

            Query query = session.createQuery(
                "from FlowVelocityModelValue where " +
                "   model:=model and " +
                "   station=:station"
            );

            query.setParameter("model", model);
            query.setParameter("station", station);

            List<FlowVelocityModelValue> values = query.list();

            if (values.isEmpty()) {
                peer = new FlowVelocityModelValue(
                    model, station, totalChannel, mainChannel, shearStress);

                session.save(peer);
            }
            else {
                peer = values.get(0);
            }
        }

        return peer;
    }
}
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