package de.intevation.aft;

import org.w3c.dom.Element;
import org.w3c.dom.NodeList;

import java.util.ArrayList;
import java.util.List;
import java.util.Date;
import java.util.Calendar;
import java.util.Collections;
import java.util.Comparator;

import java.util.regex.Pattern;
import java.util.regex.Matcher;

import org.apache.log4j.Logger;

public class DIPSGauge
{
    private static Logger log = Logger.getLogger(DIPSGauge.class);

    public static final Pattern DATE_PATTERN = Pattern.compile(
        "(\\d{4})-(\\d{2})-(\\d{2})\\s+(\\d{2}):(\\d{2}):(\\d{2})");

    public static final Comparator<Datum> DATE_CMP = new Comparator<Datum>() {
        public int compare(Datum a, Datum b) {
            return a.date.compareTo(b.date);
        }
    };

    public static class Datum {

        protected double value;
        protected Date   date;

        public Datum() {
        }

        public Datum(Element element) {
            value = Double.parseDouble(element.getAttribute("WERT"));
            String dateString = element.getAttribute("GUELTIGAB");
            if (dateString.length() == 0) {
                throw 
                    new IllegalArgumentException("missing GUELTIGAB attribute");
            }
            Matcher m = DATE_PATTERN.matcher(dateString);
            if (!m.matches()) {
                throw
                    new IllegalArgumentException("GUELTIGAB does not match");
            }

            int year  = Integer.parseInt(m.group(1));
            int month = Integer.parseInt(m.group(2));
            int day   = Integer.parseInt(m.group(3));
            int hours = Integer.parseInt(m.group(4));
            int mins  = Integer.parseInt(m.group(5));
            int secs  = Integer.parseInt(m.group(6));

            Calendar cal = Calendar.getInstance();
            cal.set(year, month, day, hours, mins, secs);

            date = cal.getTime();
        }
    } // class datum

    protected double aeo;

    protected List<Datum> datums;

    public DIPSGauge() {
    }

    public DIPSGauge(Element element) {
        String aeoString = element.getAttribute("EINZUGSGEBIET_AEO");
        if (aeoString.length() == 0) {
            log.warn("WARN: setting AEO to zero");
            aeoString = "0";
        }
        aeo = Double.parseDouble(aeoString);

        datums = new ArrayList<Datum>();
        NodeList nodes = element.getElementsByTagName("PNP");
        for (int i = 0, N = nodes.getLength(); i < N; ++i) {
            Element e = (Element)nodes.item(i);
            Datum datum = new Datum(e);
            datums.add(datum);
        }
        Collections.sort(datums, DATE_CMP);
    }

    public List<Datum> getDatums() {
        return datums;
    }
}
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