package de.intevation.flys.artifacts.states;

import java.util.List;

import org.apache.log4j.Logger;

import de.intevation.artifacts.CallContext;
import de.intevation.artifacts.CallMeta;

import de.intevation.artifactdatabase.state.Facet;

import de.intevation.flys.artifacts.FLYSArtifact;
import de.intevation.flys.artifacts.context.FLYSContext;
import de.intevation.flys.artifacts.model.WMSDBLayerFacet;
import de.intevation.flys.artifacts.resources.Resources;
import de.intevation.flys.artifacts.states.DefaultState.ComputeType;
import de.intevation.flys.utils.FLYSUtils;
import de.intevation.flys.utils.GeometryUtils;


public class RiverAxisState extends OutputState {

    public static final String I18N_DESCRIPTION = "floodmap.riveraxis";


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


    @Override
    public Object computeInit(
        FLYSArtifact artifact,
        String       hash,
        Object       context,
        CallMeta     meta,
        List<Facet>  facets
    ) {
        logger.debug("RiverAxisState.computeInit()");

        FLYSContext flysContext = null;

        if (context instanceof FLYSContext) {
            flysContext = (FLYSContext) context;
        }
        else {
            flysContext = (FLYSContext) ((CallContext) context).globalContext();
        }

        String river = artifact.getDataAsString("river");

        if(river == null || river.length() == 0) {
            logger.warn("No river found in the current parameterization.");
            return null;
        }

        String url = FLYSUtils.getUserWMSUrl(artifact.identifier());

        WMSDBLayerFacet facet = new WMSDBLayerFacet(
            0,
            FLOODMAP_RIVERAXIS,
            Resources.getMsg(meta, I18N_DESCRIPTION, I18N_DESCRIPTION),
            ComputeType.INIT,
            getID(), hash,
            url);

        String name = artifact.identifier() + "-" + FLOODMAP_RIVERAXIS;

        facet.addLayer(name);
        facet.setExtent(GeometryUtils.getRiverBoundary(river));
        facet.setSrid(FLYSUtils.getRiverSrid(artifact));
        facet.setData("geom FROM river_axes USING UNIQUE id USING SRID 31466");
        facet.setFilter("river_id=1");
        facet.setGeometryType("LINE");

        facets.add(facet);

        return null;
    }
}
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