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.CrossSectionFacet;

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

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

import de.intevation.artifactdatabase.data.DefaultStateData;
import de.intevation.artifactdatabase.state.DefaultOutput;
import de.intevation.artifactdatabase.state.Facet;
import de.intevation.artifactdatabase.state.State;

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


public class CrossSectionArtifact extends StaticFLYSArtifact {

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

    /** Name of Artifact. */
    public static final String CS_ARTIFACT_NAME = "cross_section";

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

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


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


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

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

        String ids = XMLUtils.xpathString(
            data, XPATH_IDS, ArtifactNamespaceContext.INSTANCE);

        if (ids != null && ids.length() > 0) {
            addStringData("ids", ids);
        }
        else {
            throw new IllegalArgumentException("No attribute 'ids' found!");
        }

        List<Facet> fs = new ArrayList<Facet>();
        fs.add(new CrossSectionFacet(0, "TODO GET NAME FROM DB"));

        StaticState state = (StaticState) getCurrentState(context);
        state.computeInit(this, hash(), context, callMeta, fs);

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


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


    /**
     * Create and return a new StaticState with charting output.
     */
    @Override
    public State getCurrentState(Object cc) {
        State state = new StaticState(STATIC_STATE_NAME);

        List<Facet> fs = facets.get(getCurrentStateId());

        DefaultOutput o = new DefaultOutput(
            "cross_section",
            "cross_section",
            "image/png",
            fs,
            "chart");

        state.getOutputs().add(o);

        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;
    }
}
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