/* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde
 * Software engineering by Intevation GmbH
 *
 * 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.artifacts.states.fixation;

import java.text.DateFormat;
import java.util.Collection;
import java.util.List;

import org.apache.commons.lang.math.DoubleRange;
import org.apache.log4j.Logger;
import org.dive4elements.artifactdatabase.state.Facet;
import org.dive4elements.artifacts.CallContext;
import org.dive4elements.artifacts.CallMeta;
import org.dive4elements.river.artifacts.D4EArtifact;
import org.dive4elements.river.artifacts.access.FixRealizingAccess;
import org.dive4elements.river.artifacts.model.CalculationResult;
import org.dive4elements.river.artifacts.model.CrossSectionWaterLineFacet;
import org.dive4elements.river.artifacts.model.DataFacet;
import org.dive4elements.river.artifacts.model.FacetTypes;
import org.dive4elements.river.artifacts.model.ReportFacet;
import org.dive4elements.river.artifacts.model.WQCKms;
import org.dive4elements.river.artifacts.model.WQKms;
import org.dive4elements.river.artifacts.model.fixings.FixRealizingCalculation;
import org.dive4elements.river.artifacts.model.fixings.FixRealizingResult;
import org.dive4elements.river.artifacts.model.fixings.FixReferenceEventsFacet;
import org.dive4elements.river.artifacts.model.fixings.FixResultColumn;
import org.dive4elements.river.artifacts.model.fixings.FixResultColumns;
import org.dive4elements.river.artifacts.model.fixings.FixWQCurveFacet;
import org.dive4elements.river.artifacts.model.fixings.FixWaterlevelFacet;
import org.dive4elements.river.artifacts.resources.Resources;
import org.dive4elements.river.artifacts.states.DefaultState;
import org.dive4elements.river.utils.Formatter;

/**
 * State to compute the fixation realizing (vollmer) results.
 *
 * @author <a href="mailto:raimund.renkert@intevation.de">Raimund Renkert</a>
 */
public class FixRealizingCompute extends DefaultState implements FacetTypes {

    private static final long serialVersionUID = 1L;

    /** The log used in this class. */
    private static Logger log = Logger.getLogger(FixRealizingCompute.class);

    public static final String I18N_WQ_CURVE = "fix.vollmer.wq.curve";

    /**
     * The default constructor that initializes an empty State object.
     */
    public FixRealizingCompute() {
    }

    @Override
    public Object computeAdvance(final D4EArtifact artifact, final String hash, final CallContext context, final List<Facet> facets, final Object old) {
        log.debug("FixRealizingCompute.computeAdvance");

        CalculationResult res;

        final FixRealizingAccess access = new FixRealizingAccess(artifact);

        if (old instanceof CalculationResult) {
            res = (CalculationResult) old;
        } else {
            final FixRealizingCalculation calc = new FixRealizingCalculation(access);
            res = calc.calculate();
        }

        if (facets == null) {
            return res;
        }

        if (res.getReport().hasProblems()) {
            facets.add(new ReportFacet());
        }

        final String stateId = getID();
        final CallMeta meta = context.getMeta();

        final FixRealizingResult fixRes = (FixRealizingResult) res.getData();
        final WQKms[] wqkms = fixRes != null ? fixRes.getWQKms() : new WQKms[0];

        for (int i = 0; i < wqkms.length; i++) {
            String nameW = null;
            String nameQ = null;

            if (access.isQ()) {
                nameQ = wqkms[i].getName();
                nameW = "W(" + nameQ + ")";
            } else {
                nameW = wqkms[i].getName();
                nameQ = "Q(" + nameW + ")";
            }

            facets.add(new FixWaterlevelFacet(i, FIX_WQ_LS, nameW, ComputeType.ADVANCE, hash, stateId));
            facets.add(new FixWaterlevelFacet(i, LONGITUDINAL_W, nameW, ComputeType.ADVANCE, hash, stateId));
            facets.add(new FixWaterlevelFacet(i, LONGITUDINAL_Q, nameQ, ComputeType.ADVANCE, hash, stateId));
            facets.add(new CrossSectionWaterLineFacet(i, nameW, ComputeType.ADVANCE, hash, stateId, Integer.valueOf(i)));

            // XXX: THIS CAN NOT HAPPEN! REMOVE IT!
            if (wqkms[i] instanceof WQCKms) {
                final String nameC = nameW.replace("benutzerdefiniert", "benutzerdefiniert [korrigiert]");
                facets.add(new FixWaterlevelFacet(i, DISCHARGE_LONGITUDINAL_C, nameC));
            }
        }

        int facetIndex = 0;

        if (fixRes != null && wqkms.length > 0) {

            final DateFormat df = Formatter.getDateFormatter(context.getMeta(), "dd.MM.yyyy");
            final UniqueDateFormatter cf = new UniqueDateFormatter(df);

            final FixResultColumns columns = fixRes.getFixResultColumns();
            final Collection<FixResultColumn> fixEvents = columns.getSortedColumns();
            for (final FixResultColumn event : fixEvents) {

                final String facetDescription = cf.format(event.getDate());
                final DoubleRange stationRange = event.getStationRange();

                facets.add(new FixReferenceEventsFacet(facetIndex++, event.getColumnId(), FIX_EVENTS, facetDescription, stationRange));
            }

            facets.add(new DataFacet(CSV, "CSV data", ComputeType.ADVANCE, hash, stateId));
            facets.add(new DataFacet(WST, "WST data", ComputeType.ADVANCE, hash, stateId));
            facets.add(new DataFacet(PDF, "PDF data", ComputeType.ADVANCE, hash, stateId));
        }

        facets.add(new DataFacet(AT, "AT data", ComputeType.ADVANCE, hash, stateId));

        if (fixRes != null)
            facets.add(new FixWQCurveFacet(0, Resources.getMsg(meta, I18N_WQ_CURVE, I18N_WQ_CURVE) + " (" + access.getFunction() + ")"));

        return res;
    }
}