package de.intevation.flys.artifacts.states.extreme;

import de.intevation.artifactdatabase.state.Facet;

import de.intevation.artifacts.CallContext;

import de.intevation.flys.artifacts.FLYSArtifact;

import de.intevation.flys.artifacts.access.ExtremeAccess;

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

import de.intevation.flys.artifacts.model.extreme.ExtremeCalculation;

import de.intevation.flys.artifacts.states.DefaultState;

import java.util.List;

import org.apache.log4j.Logger;

/** State in which to deliver extreme value analysis result. */
public class ExtremeCompute
extends      DefaultState
{
    /** Private logger. */
    private static Logger log = Logger.getLogger(ExtremeCompute.class);

    public ExtremeCompute() {
    }

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

        CalculationResult res;

        ExtremeAccess access = new ExtremeAccess(artifact);

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

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

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

        // TODO: Add more facets.

        return res;
    }
}
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