package de.intevation.flys.artifacts;

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

import org.apache.log4j.Logger;

import org.w3c.dom.Document;

import de.intevation.artifacts.Artifact;
import de.intevation.artifacts.ArtifactFactory;
import de.intevation.artifacts.CallMeta;

import de.intevation.flys.artifacts.model.AreaFacet;

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

import de.intevation.flys.artifacts.states.AreaCreationState;
import de.intevation.flys.artifacts.states.StaticState;

import de.intevation.artifactdatabase.state.Facet;
import de.intevation.artifactdatabase.state.State;

import de.intevation.flys.utils.FLYSUtils;

/**
 * Artifact describing the area between two WKms.
 */
public class AreaArtifact extends StaticFLYSArtifact {

    /** Access ids of doc. */
    public static final String XPATH_IDS = "/art:action/art:ids/@value";

    /** Name of Artifact. */
    public static final String AREA_ARTIFACT_NAME = "area_artifact";

    /** Name of state. */
    public static final String STATIC_STATE_NAME = "state.area_artifact";

    /** data item name to access upper curve. */
    public static final String AREA_CURVE_OVER = "area.curve_over";

    /** data item name to access lower curve. */
    public static final String AREA_CURVE_UNDER = "area.curve_under";

    /** Own logger. */
    private static final Logger logger =
        Logger.getLogger(AreaArtifact.class);


    /** Return given name. */
    @Override
    public String getName() {
        return AREA_ARTIFACT_NAME;
    }


    /** Store ids, create an AreaFacet. */
    @Override
    public void setup(
        String          identifier,
        ArtifactFactory factory,
        Object          context,
        CallMeta        callMeta,
        Document        data)
    {
        logger.info("AreaArtifact.setup");

        super.setup(identifier, factory, context, callMeta, data);

        // TODO ye unused.
        String ids = XMLUtils.xpathString(
            data, XPATH_IDS, ArtifactNamespaceContext.INSTANCE);

        List<Facet> fs = new ArrayList<Facet>();
        fs.add(new AreaFacet(0, "TODO: I am an AreaFacet"));

        AreaCreationState state = (AreaCreationState) getCurrentState(context);

        if (!fs.isEmpty()) {
            facets.put(getCurrentStateId(), fs);
        }
    }

    // TODO Data is not cached in this way.

    /** Do not copy data from daddyfact. */
    @Override
    protected void initialize(
        Artifact artifact,
        Object   context,
        CallMeta callMeta)
    {
        // do nothing
    }


    /**
     * Get dataprovider key for the 'lower' curve (we got that information fed
     * from the client and store it as data).
     */
    public String getLowerDPKey() {
        return getDataAsString(AREA_CURVE_UNDER);
    }


    /**
     * Get dataprovider key for the 'upper' curve (we got that information fed
     * from the client and store it as data).
     */
    public String getUpperDPKey() {
        return getDataAsString(AREA_CURVE_OVER);
    }


    /**
     * Create and return a new AreaCreationState with charting output.
     */
    @Override
    public State getCurrentState(Object cc) {
        final List<Facet> fs = facets.get(getCurrentStateId());

        AreaCreationState state = new AreaCreationState();

        StaticState.addDefaultChartOutput(state, "cross_section", fs);

        return state;
    }


    /**
     * Get a list containing the one and only State.
     * @param  context ignored.
     * @return list with one and only state.
     */
    @Override
    protected List<State> getStates(Object context) {
        ArrayList<State> states = new ArrayList<State>();
        states.add(getCurrentState(context));

        return states;
    }

    /** Trivia. */
    protected State getState(Object context, String stateID) {
        return getCurrentState(null);
    }
}
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