/* Copyright (C) 2017 by Bundesanstalt für Gewässerkunde
 * Software engineering by
 *  Björnsen Beratende Ingenieure GmbH
 *  Dr. Schumacher Ingenieurbüro für Wasser und Umwelt
 *
 * 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.model.sinfo;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import org.dive4elements.river.backend.SessionHolder;
import org.hibernate.SQLQuery;
import org.hibernate.Session;
import org.hibernate.type.StandardBasicTypes;


/**
 * Aggregation of collision_values
 *
 * @author Matthias Schäfer
 *
 */
public class CollisionAggregateValue implements Serializable {

    /***** FIELDS *****/

    private static final long serialVersionUID = 1;

    private Collision parent;

    private double station;

    // private CollisionType collisionType;

    private Date minDate;

    private Date maxDate;

    private int count;

    private double gaugeW;


    /***** CONSTRUCTORS *****/

    public CollisionAggregateValue() {
    }

    public CollisionAggregateValue(final Collision collision, final double station, final Date minDate, final Date maxDate, final int count,
            final double gaugeW) {
        this.parent = collision;
        this.station = station;
        // this.collisionType = collisionType;
        this.minDate = minDate;
        this.maxDate = maxDate;
        this.count = count;
        this.gaugeW = gaugeW;
    }


    /***** METHODS *****/

    public int getCount() {
        return this.count;
    }

    public Collision getCollision() {
        return this.parent;
    }

    public double getStation() {
        return this.station;
    }

    // public CollisionType getCollisionType() {
    // return this.collisionType;
    // }

    public Date getMinDate() {
        return this.minDate;
    }

    public Date getMaxDate() {
        return this.maxDate;
    }

    public Double getGaugeW() {
        return this.gaugeW;
    }

    /**
     * Selects the collision aggregate values of a data series in a km range from the database
     */
    public static List<CollisionAggregateValue> getValuesByKm(final Collision parent, final double kmLo, final double kmHi) {
        final Session session = SessionHolder.HOLDER.get();
        final SQLQuery query = session.createSQLQuery("SELECT FLOOR(station+0.4999) AS station, COUNT(*) AS count,"
                + " MIN(event_date) AS date_min, MAX(event_date) AS date_max,"
                + "  AVG(gauge_w) AS gauge_w"
                + " FROM collision_values v INNER JOIN collision s ON v.collision_id=s.id"
                + " WHERE (collision_id=:parent)"
                + " AND (station BETWEEN (:kmLo - 0.0001) AND (:kmHi + 0.0001))"
                + " GROUP BY FLOOR(station+0.4999);").addScalar("station", StandardBasicTypes.DOUBLE)
                .addScalar("count", StandardBasicTypes.INTEGER).addScalar("date_min", StandardBasicTypes.DATE)
                .addScalar("date_max", StandardBasicTypes.DATE).addScalar("gauge_w", StandardBasicTypes.DOUBLE);
        query.setInteger("parent", parent.getId());
        query.setDouble("kmLo", new Double(kmLo));
        query.setDouble("kmHi", new Double(kmHi));
        final List<CollisionAggregateValue> values = new ArrayList();
        final List<Object[]> rows = query.list();
        if (rows != null) {
            for (int i = 0; i <= rows.size() - 1; i++) {
                values.add(new CollisionAggregateValue(parent, (double) rows.get(i)[0], (Date) rows.get(i)[2], (Date) rows.get(i)[3],
                        (int) rows.get(i)[1], (double) rows.get(i)[4]));
            }
        }
        return values;
    }
}