/* 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;

import java.util.ArrayList;
import java.util.List;

import org.apache.log4j.Logger;

import org.dive4elements.artifacts.CallContext;

import org.dive4elements.artifactdatabase.state.Facet;

import org.dive4elements.river.artifacts.D4EArtifact;
import org.dive4elements.river.artifacts.access.BedHeightAccess;
import org.dive4elements.river.artifacts.model.CalculationResult;
import org.dive4elements.river.artifacts.model.DataFacet;
import org.dive4elements.river.artifacts.model.FacetTypes;
import org.dive4elements.river.artifacts.model.MiddleBedHeightData;
import org.dive4elements.river.artifacts.model.MiddleBedHeightFacet;
import org.dive4elements.river.artifacts.model.MiddleBedHeightCalculation;


/** State in which Middle Bed Heights are generated. */
public class MiddleBedHeight extends DefaultState implements FacetTypes {

    /** Private logger. */
    private static final Logger logger = Logger.getLogger(MiddleBedHeight.class);


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

        List<Facet> newFacets = new ArrayList<Facet>();

        BedHeightAccess access = new BedHeightAccess(artifact);

        CalculationResult res = old instanceof CalculationResult
            ? (CalculationResult) old
            : new MiddleBedHeightCalculation().calculate(access);

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

        MiddleBedHeightData[] data = (MiddleBedHeightData[]) res.getData();

        logger.debug("Calculated " + data.length + " MiddleBedHeightData objects");

        String id  = getID();
        int    idx = 0;

        for (MiddleBedHeightData d: data) {
            if (d.getStartYear() == d.getEndYear()) {
                newFacets.add(new MiddleBedHeightFacet(
                    idx,
                    MIDDLE_BED_HEIGHT_SINGLE,
                    d.getDescription(),
                    ComputeType.ADVANCE,
                    id,
                    hash
                ));
            }
            else {
                newFacets.add(new MiddleBedHeightFacet(
                    idx,
                    MIDDLE_BED_HEIGHT_EPOCH,
                    d.getDescription(),
                    ComputeType.ADVANCE,
                    id,
                    hash
                ));
            }

            idx++;
        }

        Facet csv = new DataFacet(
            CSV, "CSV data", ComputeType.ADVANCE, hash, id);

        // TODO ADD PDF FACET

        newFacets.add(csv);

        logger.debug("Created " + newFacets.size() + " new Facets.");

        facets.addAll(newFacets);

        return res;
    }
}
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