package de.intevation.gnv.statistics;

import com.vividsolutions.jts.geom.Point;
import com.vividsolutions.jts.io.ParseException;
import com.vividsolutions.jts.io.WKTReader;

import de.intevation.gnv.geobackend.base.Result;
import de.intevation.gnv.geobackend.base.ResultDescriptor;

import de.intevation.gnv.utils.DistanceCalculator;

import java.sql.SQLException;

import org.apache.log4j.Logger;

/**
 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
 */
public class HorizontalProfileVectorStatistics
extends      VectorStatistics
{

    private static Logger logger =
        Logger.getLogger(HorizontalProfileVectorStatistics.class);

    private WKTReader wktReader = new WKTReader();

    private double distance;


    public HorizontalProfileVectorStatistics() {
        distance = 0;
    }


    protected void clear() {
        distance = 0;
    }


    protected int getValueIdx(ResultDescriptor rd) {
        return rd.getColumnIndex("YORDINATE");
    }


    protected double calculateXOrdinateValue(Result prev, Result row)
    throws SQLException
    {
        try {
            Point start   = (Point) wktReader.read(prev.getString("SHAPE"));
            Point current = (Point) wktReader.read(row.getString("SHAPE"));

            double delta = DistanceCalculator.calculateDistance(start, current);

            distance = !Double.isNaN(delta) ? distance + delta : distance;
        }
        catch (ParseException e) {
            logger.error(e,e);
        }
        return distance;
    }
}
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