package de.intevation.flys.artifacts.states;

import java.util.List;

import org.apache.log4j.Logger;

import de.intevation.artifacts.CallContext;

import de.intevation.artifactdatabase.state.Facet;

import de.intevation.artifacts.Artifact;
import de.intevation.flys.artifacts.FLYSArtifact;
import de.intevation.flys.artifacts.WINFOArtifact;

import de.intevation.flys.artifacts.math.WKmsOperation;

import de.intevation.flys.artifacts.model.FacetTypes;
import de.intevation.flys.artifacts.model.WKms;
import de.intevation.flys.artifacts.model.WQKms;

import de.intevation.flys.artifacts.model.DataFacet;
import de.intevation.artifactdatabase.data.StateData;

import de.intevation.flys.utils.FLYSUtils;


public class WDifferencesState
extends      DefaultState
implements   FacetTypes
{
    /** The logger that is used in this state. */
    private static Logger logger = Logger.getLogger(WDifferencesState.class);


    public WDifferencesState() {
    }


    /** Specify to display nothing (this is kind of a "final" state). */
    @Override
    protected String getUIProvider() {
        return "noinput";
    }


    @Override
    public boolean validate(Artifact artifact)
    throws IllegalArgumentException
    {
        FLYSArtifact flys = (FLYSArtifact) artifact;

        StateData data = flys.getData("diffids");

        if (data == null) {
            throw new IllegalArgumentException("diffids is empty");
        }

        // TODO: Also validate format.

        return true;
    }



    @Override
    public Object computeAdvance(
        FLYSArtifact artifact,
        String       hash,
        CallContext  context,
        List<Facet>  facets,
        Object       old
    ) {
        WINFOArtifact winfo = (WINFOArtifact)artifact;
        String id = getID();

        // Load the Artifacts/facets that we want to subtract and display.
        // Expected format is:
        // [42537f1e-3522-42ef-8968-635b03d8e9c6;longitudinal_section.w;0]#[1231f2-....]
        String datas[] = winfo.getDataAsString("diffids").split("#");

        // Validate the Data-Strings.
        for (String s: datas) {
            if (!WaterlevelSelectState.isValueValid(winfo.getDataAsString("diffids"))) {
                // TODO: escalate.
            }
        }

        if (datas.length != 2) {
            // TODO crash with style
            ;
        }
        String uuid1 = WaterlevelSelectState.strip(datas[0]).split(";")[0];
        String uuid2 = WaterlevelSelectState.strip(datas[1]).split(";")[0];

        WINFOArtifact flys1 = (WINFOArtifact) FLYSUtils.getArtifact(
            uuid1,
            context);
        WINFOArtifact flys2 = (WINFOArtifact) FLYSUtils.getArtifact(
            uuid2,
            context);

        if (flys1 == null) {
            logger.warn("One of the artifacts (1) for diff calculation could not be loaded");
        }
        if (flys2 == null) {
            logger.warn("One of the artifacts (2) for diff calculation could not be loaded");
        }
        WKms wkms = null;
        String facetName = "diff ()";

        if (flys1 != null && flys2 != null) {
            // TODO also check size.
            // TODO also need index of wqkms.
            WQKms[] minuend = (WQKms[]) flys1.getWaterlevelData().getData();
            WQKms[] subtrahend = (WQKms[]) flys2.getWaterlevelData().getData();
            wkms = WKmsOperation.SUBTRACTION.operate(minuend[0], subtrahend[0]);
            facetName = "W ("+minuend[0].getName() + ") - W (" + subtrahend[0].getName()+")";
            logger.warn("Did a WKMSSubtraction");
            // Add these datasets also as facets ("absolutes").
            /*
            Facet minuendAbsFacet = new WaterlevelFacet(0, LONGITUDINAL_W,
                "Minuend: W (_todo_)", ComputeType.ADVANCE, id, hash);
            Facet subtrahendAbsFacet = new WaterlevelFacet(1, LONGITUDINAL_W,
                "Subtrahend: W (_todo_)", ComputeType.ADVANCE, id, hash);
            */
            //facets.add(minuendAbsFacet);
            //facets.add(subtrahendAbsFacet);
        }

        if (facets != null) {
            // TODO: pass computetype and state id.
            //, ComputeType.ADVANCE, getID(), hash));
            facets.add(new DataFacet(W_DIFFERENCES, facetName));
            facets.add(new DataFacet(CSV, "CSV data"));
        }
        else {
            logger.debug("Not adding facets in WDifferencesState.");
        }

        return wkms;
    }
}
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