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

import java.util.ArrayList;
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.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.ArtifactStatisticValue;
import de.intevation.gnv.artifactdatabase.objects.DefaultInputParameter;
import de.intevation.gnv.artifactdatabase.objects.InputParameter;
import de.intevation.gnv.util.XMLUtils;
import de.intevation.gnv.util.XSLTransformer;

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

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

    /**
     * @see de.intevation.gnv.action.ArtifactDatabaseActionBase#execute(org.apache.struts.action.ActionMapping,
     *      org.apache.struts.action.ActionForm,
     *      javax.servlet.http.HttpServletRequest,
     *      javax.servlet.http.HttpServletResponse)
     */
    @Override
    public ActionForward execute(ActionMapping mapping, ActionForm form,
                                 HttpServletRequest request,
                                 HttpServletResponse response) throws Exception {
        try {
            log.debug("NextArtifactStepAction.execute");
            SessionModel sm = SessionModelFactory.getInstance()
                    .getSessionModel(request);
            ArtifactDescription ad = sm.getArtifactDescription();
            Collection<String> inputParameter = ad.getInputParameter();
            Collection<InputParameter> ips = null;
            if (inputParameter != null) {
                ips = new ArrayList<InputParameter>(inputParameter.size());
                Iterator<String> it = inputParameter.iterator();
                while (it.hasNext()) {
                    String name = it.next();
                    String[] values = request.getParameterValues(name);
                    InputParameter ip = new DefaultInputParameter(name, values);
                    ips.add(ip);
                }
            }
            ArtifactDatabaseClient adc = ArtifactDatabaseClientFactory
                    .getInstance().getArtifactDatabaseClient();
            if (ad.getReachableStates() != null
                && !ad.getReachableStates().isEmpty()) {
                // TODO: Woher kommt der zu erreichende Status;
                String target = null;
                if (ad.getReachableStates().size() > 1) {
                    target = request.getParameter("product"); // TODO HACK for
                    // Propducts every
                    // other Step has
                    // currently only
                    // one reachable
                    // state.
                } else {
                    target = ad.getReachableStates().iterator().next();
                }

                ArtifactDescription artifactDescription = adc.doNextStep(sm
                        .getSelectedArtifactFactory(), sm.getCurrentArtifact(),
                        target, ips);

                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()));

            } else {

                adc.doFeed(sm.getSelectedArtifactFactory(), sm
                        .getCurrentArtifact(), ips);

                request.setAttribute("diagramm", true);

                // statistic abholen und in das sessionmodell schreiben.

                Collection<ArtifactStatisticValue> statistics = adc
                        .calculateStatistics(sm.getSelectedArtifactFactory(),
                                sm.getCurrentArtifact());
                sm.setStatistics(statistics);

                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", false);
            }
            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);
        }
    }

}