/**
 *
 */
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);
        }
    }
    

}