/**
 *
 */
package de.intevation.gnv.action;

import java.util.Collection;
import java.util.Iterator;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.log4j.Logger;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.w3c.dom.Node;

import de.intevation.gnv.action.sessionmodel.DiagrammOptions;
import de.intevation.gnv.action.sessionmodel.SessionModel;
import de.intevation.gnv.action.sessionmodel.SessionModelFactory;
import de.intevation.gnv.artifactdatabase.client.ArtifactDatabaseClient;
import de.intevation.gnv.artifactdatabase.client.ArtifactDatabaseClientFactory;
import de.intevation.gnv.artifactdatabase.objects.ArtifactDescription;
import de.intevation.gnv.artifactdatabase.objects.OutputMode;
import de.intevation.gnv.artifactdatabase.objects.OutputParameter;
import de.intevation.gnv.util.XMLUtils;
import de.intevation.gnv.util.XSLTransformer;

/**
 * @author Tim Englich <tim.englich@intevation.de>
 * 
 */
public class ChangeOptionsAction extends ArtifactDatabaseActionBase {
    /**
     * the logger, used to log exceptions and additonaly information
     */
    private static Logger log = Logger.getLogger(ChangeOptionsAction.class);

    /**
     * Constructor
     */
    public ChangeOptionsAction() {
        super();
    }

    @Override
    public ActionForward execute(ActionMapping mapping, ActionForm form,
                                 HttpServletRequest request,
                                 HttpServletResponse response) throws Exception {
        log.debug("NextArtifactStepAction.execute");
        try {
            SessionModel sm = SessionModelFactory.getInstance()
                    .getSessionModel(request);

            String target = request.getParameter("target");
            OutputMode outputMode = sm.getOutputMode(target);
            if (outputMode != null) {

                Collection<OutputParameter> op = outputMode
                        .getOutputParameters();
                if (op != null) {
                    Iterator<OutputParameter> it = op.iterator();
                    DiagrammOptions diagrammOptions = new DiagrammOptions();
                    while (it.hasNext()) {
                        OutputParameter parameter = it.next();
                        diagrammOptions.setValue(parameter.getName(), request
                                .getParameter(parameter.getName()));

                    }
                    sm.setDiagrammOptions(diagrammOptions);
                }
            }

            ArtifactDescription ad = sm.getArtifactDescription();
            ArtifactDatabaseClient adc = ArtifactDatabaseClientFactory
                                                .getInstance()
                                                .getArtifactDatabaseClient(getLocale(request));

            ArtifactDescription artifactDescription = adc
                    .getCurrentStepDescription(sm.getSelectedArtifactFactory(),
                            sm.getCurrentArtifact());

            Node currentUI = artifactDescription.getCurrentUI();
            XSLTransformer transformer = new XSLTransformer();
            String ui = transformer.transform(new XMLUtils().getNodeXPath(
                    currentUI, "dynamic"), "UTF-8", request
                    .getRealPath("WEB-INF/config/templates/describe-ui.xsl"));

            request.setAttribute("ui", ui);

            String staticUI = transformer
                    .transform(
                            new XMLUtils().getNodeXPath(currentUI, "static"),
                            "UTF-8",
                            request
                                    .getRealPath("WEB-INF/config/templates/describe-ui-static.xsl"));
            request.setAttribute("staticui", staticUI);
            request.setAttribute("furthertargets",
                    (ad.getReachableStates() != null && !ad
                            .getReachableStates().isEmpty()));

            if (ad.getReachableStates() != null
                && !ad.getReachableStates().isEmpty()) {
            } else {
                request.setAttribute("diagramm", true);
            }
            return super.execute(mapping, form, request, response);
        } catch (Exception e) {
            log.error(e, e);
            request.setAttribute(
                    CommunicationKeys.REQUEST_EXCEPTION_MESSAGE_ID, e
                            .getMessage());
            return super.getExceptionForward(mapping);
        }
    }

}