package de.intevation.flys.exports.fixings;

import au.com.bytecode.opencsv.CSVWriter;

import de.intevation.artifacts.CallContext;
import de.intevation.artifacts.CallMeta;

import de.intevation.flys.artifacts.model.CalculationResult;

import de.intevation.flys.artifacts.model.fixings.AnalysisPeriod;
import de.intevation.flys.artifacts.model.fixings.FixResult;
import de.intevation.flys.artifacts.model.fixings.QWD;

import de.intevation.flys.artifacts.resources.Resources;

import de.intevation.flys.exports.AbstractExporter;

import de.intevation.flys.utils.Formatter;
import de.intevation.flys.utils.KMIndex;

import java.io.IOException;
import java.io.OutputStream;

import java.text.DateFormat;
import java.text.NumberFormat;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Locale;

import org.apache.log4j.Logger;

import org.w3c.dom.Document;

public class DeltaWtExporter
extends      AbstractExporter
{
    private static Logger log = Logger.getLogger(DeltaWtExporter.class);

    public static final String CSV_KM_HEADER =
        "export.fixings.deltawt.csv.header.km";

    public static final String CSV_DELTA_W_HEADER =
        "export.fixings.deltawt.csv.header.deltaw";

    public static final String CSV_T_HEADER =
        "export.fixings.deltawt.csv.header.t";

    public static final String CSV_T_DESC_HEADER =
        "export.fixings.deltawt.csv.header.description";

    public static final String DEFAULT_CSV_KM_HEADER = "km";

    public static final String DEFAULT_CSV_DELTA_W_HEADER = "\u0394 W [cm]";

    public static final String DEFAULT_CSV_T_HEADER = "Datum";

    public static final String DEFAULT_CSV_T_DESC_HEADER = "Beschreibung";

    protected List<KMIndex<AnalysisPeriod []>> analysisPeriods;

    protected List<KMIndex<QWD[]>> referenceEvents;

    @Override
    public void init(Document request, OutputStream out, CallContext context) {
        log.debug("DeltaWtExporter.init");
        super.init(request, out, context);
        analysisPeriods = new ArrayList<KMIndex<AnalysisPeriod []>>();
        referenceEvents = new ArrayList<KMIndex<QWD[]>>();
    }

    @Override
    protected void addData(Object d) {
        log.debug("DeltaWtExporter.addData");
        if (!(d instanceof CalculationResult)) {
            log.warn("Invalid data type");
            return;
        }

        Object data = ((CalculationResult)d).getData();
        if (!(data instanceof FixResult)) {
            log.warn("Invalid data stored in result.");
        }
        FixResult result = (FixResult)data;
        analysisPeriods.add(result.getAnalysisPeriods());
        referenceEvents.add(result.getReferenced());
    }

    @Override
    protected void writeCSVData(CSVWriter writer) throws IOException {

        boolean debug = log.isDebugEnabled();

        writeCSVHeader(writer);

        NumberFormat kmF = getKMFormatter();
        NumberFormat dwF = getDeltaWFormatter();

        CallMeta meta = context.getMeta();
        Locale locale = Resources.getLocale(meta);
        DateFormat dF = DateFormat.getDateInstance(DateFormat.SHORT, locale);

        for (KMIndex<QWD[]> reference: referenceEvents) {

            for (KMIndex.Entry<QWD[]> kmEntry: reference) {

               String kmS = kmF.format(kmEntry.getKm());
               for (QWD qwd: kmEntry.getValue()) {
                    double deltaW = qwd.getDeltaW();
                    Date   date   = qwd.getDate();
                    String desc   = qwd.getDescription();

                    String deltaWS = dwF.format(deltaW);
                    String dateS   = dF.format(date);

                    writer.writeNext(new String[] {
                        kmS,
                        deltaWS,
                        dateS,
                        desc != null ? desc : "" });
               }
            }
        }

        if (debug) {
            log.debug("AnalysisPeriods: " + analysisPeriods.size());
        }

        for (KMIndex<AnalysisPeriod []> periods: analysisPeriods) {

            for (KMIndex.Entry<AnalysisPeriod []> kmEntry: periods) {

                String kmS = kmF.format(kmEntry.getKm());

                for (AnalysisPeriod period: kmEntry.getValue()) {
                    QWD [] qwds = period.getQWDs();
                    if (qwds != null) {
                        for (QWD qwd: qwds) {
                            double deltaW = qwd.getDeltaW();
                            Date   date   = qwd.getDate();
                            String desc   = qwd.getDescription();

                            String deltaWS = dwF.format(deltaW);
                            String dateS   = dF.format(date);

                            writer.writeNext(new String[] {
                                kmS,
                                deltaWS,
                                dateS,
                                desc != null ? desc : "" });
                        }
                    }
                }
            }
        }
        writer.flush();
    }


    protected NumberFormat getKMFormatter() {
        return Formatter.getFixDeltaWKM(context);
    }

    protected NumberFormat getDeltaWFormatter() {
        return Formatter.getFixDeltaWDeltaW(context);
    }

    protected void writeCSVHeader(CSVWriter writer) {
        log.debug("DeltaWtExporter.writeCSVHeader");

        writer.writeNext(new String[] {
            msg(CSV_KM_HEADER,      DEFAULT_CSV_KM_HEADER),
            msg(CSV_DELTA_W_HEADER, DEFAULT_CSV_DELTA_W_HEADER),
            msg(CSV_T_HEADER,       DEFAULT_CSV_T_HEADER),
            msg(CSV_T_DESC_HEADER,  DEFAULT_CSV_T_DESC_HEADER)
        });
    }

    @Override
    protected void writePDF(OutputStream out) {
        // TODO: Implement me!
    }
}
// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :