package de.intevation.flys.exports;

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.DeltaWT;
import de.intevation.flys.artifacts.model.fixings.DeltaWTsKM;
import de.intevation.flys.artifacts.model.fixings.FixResult;

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

import de.intevation.flys.utils.Formatter;

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<DeltaWTsKM> deltaWTsKMs;

    @Override
    public void init(Document request, OutputStream out, CallContext context) {
        log.debug("DeltaWtExporter.init");
        super.init(request, out, context);
        deltaWTsKMs = new ArrayList<DeltaWTsKM>();
    }

    @Override
    public void generate() throws IOException {
        log.debug("DeltaWtExporter.generate");
        if (facet == null) {
            throw new IOException("invalid (null) facet for exporter");
        }
        else if (facet.equals(FACET_CSV)) {
            generateCSV();
        }
        else if (facet.equals(FACET_PDF)) {
            generatePDF();
        }
        else {
            throw new IOException("invalid facet (" + facet + ") for exporter");
        }
    }

    @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;
        deltaWTsKMs.add(result.getDeltaWTsKM());
    }

    @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);

        if (debug) {
            log.debug("DeltaWTsKMs: " + deltaWTsKMs.size());
        }

        for (DeltaWTsKM deltaWTsKM: deltaWTsKMs) {
            List<DeltaWTsKM.KM> dkms = deltaWTsKM.getKms();
            if (debug) {
                log.debug("DeltaWTsKM.KM: " + dkms.size());
            }
            for (DeltaWTsKM.KM dkm: dkms) {
                double km = dkm.getKm();
                String kmS = kmF.format(km);
                List<DeltaWT> deltaWTs = dkm.getDeltaWTs();
                if (debug) {
                    log.debug("deltaWTs: " + deltaWTs.size());
                }
                for (DeltaWT dwt: deltaWTs) {
                    double deltaW = dwt.getDeltaW();
                    Date   date   = dwt.getDate();
                    String desc   = dwt.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 :