package de.intevation.flys.artifacts.states;

import java.util.List;

import org.w3c.dom.Element;

import org.apache.log4j.Logger;

import de.intevation.artifacts.Artifact;
import de.intevation.artifacts.CallContext;

import de.intevation.artifacts.common.utils.XMLUtils.ElementCreator;

import de.intevation.artifactdatabase.state.Facet;

import de.intevation.flys.artifacts.FLYSArtifact;
import de.intevation.flys.artifacts.WINFOArtifact;
import de.intevation.flys.artifacts.model.CalculationResult;
import de.intevation.flys.artifacts.model.DataFacet;
import de.intevation.flys.artifacts.model.FacetTypes;
import de.intevation.flys.artifacts.model.HistoricalDischargeFacet;
import de.intevation.flys.artifacts.model.HistoricalDischargeDifferenceFacet;
import de.intevation.flys.artifacts.model.HistoricalWQTimerange;
import de.intevation.flys.artifacts.model.ReportFacet;
import de.intevation.flys.artifacts.model.WQTimerange;


/**
 * State to calculate historical discharge curves.
 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
 */
public class HistoricalDischargeComputeState
extends      DefaultState
implements   FacetTypes
{

    private static final Logger logger =
        Logger.getLogger(HistoricalDischargeComputeState.class);

    public static final String DEFAULT_UNIT = "cm";


    @Override
    protected void appendItems(
        Artifact       artifact,
        ElementCreator creator,
        String         name,
        CallContext    context,
        Element        select
    ) {
        // TODO IMPLEMENT ME
    }


    @Override
    public Object computeAdvance(
        FLYSArtifact artifact,
        String       hash,
        CallContext  context,
        List<Facet>  facets,
        Object       old
    ) {
        logger.debug("HistoricalDischargeComputeState.computeAdvance");

        WINFOArtifact winfo = (WINFOArtifact) artifact;

        CalculationResult res = old instanceof CalculationResult
            ? (CalculationResult) old
            : winfo.getHistoricalDischargeData();

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

        if (res.getReport().hasProblems()) {
            facets.add(new ReportFacet(ComputeType.ADVANCE, hash, id));
        }

        WQTimerange[] data = (WQTimerange[]) res.getData();
        if (data == null || data.length == 0) {
            logger.warn("Historical Discharge calculation has no results!");
            return res;
        }

        facets.add(
            new DataFacet(CSV, "CSV data", ComputeType.ADVANCE, hash, id));

        facets.add(
            new DataFacet(PDF, "PDF data", ComputeType.ADVANCE, hash, id));

        prepareFacets(facets, data);

        return res;
    }


    protected void prepareFacets(List<Facet> facets, WQTimerange[] wqts) {
        int i = 0;

        for (WQTimerange wqt: wqts) {
            logger.debug("Prepare facet for: " + wqt.getName());

            // TODO CREATE BETTER TITLE FOR FACETS

            facets.add(new HistoricalDischargeFacet(
                i,
                HISTORICAL_DISCHARGE_Q,
                createFacetTitle(wqt)));

            if (wqt instanceof HistoricalWQTimerange) {
                logger.debug("Create another facet for historical differences.");

                facets.add(new HistoricalDischargeDifferenceFacet(
                    i,
                    HISTORICAL_DISCHARGE_Q_DIFF,
                    "DIFF: " + wqt.getName()));
            }

            i++;
        }
    }


    protected String createFacetTitle(WQTimerange wqt) {
        String name = wqt.getName();

        return name != null && name.indexOf("W") >= 0
            ? createFacetTitleW(wqt)
            : createFacetTitleQ(wqt);
    }


    protected String createFacetTitleW(WQTimerange wqt) {
        String name = wqt.getName();
        return name + " " + DEFAULT_UNIT;
    }


    protected String createFacetTitleQ(WQTimerange wqt) {
        return wqt.getName();
    }
}
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