/*
 * Copyright (c) 2010 by Intevation GmbH
 *
 * This program is free software under the LGPL (>=v2.1)
 * Read the file LGPL.txt coming with the software for details
 * or visit http://www.gnu.org/licenses/ if it does not exist.
 */

package de.intevation.gnv.action;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.Locale;
import java.util.Map;

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 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.client.exception.ArtifactDatabaseInputException;
import de.intevation.gnv.artifactdatabase.objects.ArtifactDescription;
import de.intevation.gnv.artifactdatabase.objects.DefaultInputParameter;
import de.intevation.gnv.artifactdatabase.objects.InputParameter;

/**
 * This controller feeds the artifact server with the current input data and
 * refreshes the gui with the current artifact description after the next state
 * is reached.
 *
 * @author <a href="mailto:tim.englich@intevation.de">Tim Englich</a>
 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
 */
public class NextArtifactStepAction extends DescribeUIAction {

    /**
     * the logger, used to log exceptions and additonaly information
     */
    private static Logger log = Logger
            .getLogger(SelectArtifactFactoryAction.class);

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

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

            Locale tmp    = sm.getCurrentLocale();
            Locale locale = tmp != null ? tmp : request.getLocale();

            if (ad != null){
                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(locale);

                Map outs = ad.getOutputModes();
                if (outs == null || outs.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();
                    }

                    try {
                        adc.doNextStep(
                            sm.getSelectedArtifactFactory(),
                            sm.getCurrentArtifact(),
                            target,
                            ips
                        );
                    }
                    catch (ArtifactDatabaseInputException e) {
                        log.error(e, e);
                        request.setAttribute(
                            CommunicationKeys.REQUEST_EXCEPTION_INPUT_ID,
                            e.getMessage());
                    }
                    catch (Exception e) {
                        log.error(e, e);
                        request.setAttribute(
                            CommunicationKeys.REQUEST_EXCEPTION_MESSAGE_ID,
                            e.getMessage());
                    }

                    Map tmpOuts = ad.getOutputModes();
                    request.setAttribute(
                        "furthertargets",
                        tmpOuts == null || tmpOuts.isEmpty()
                    );
                } else {
                    try{
                        adc.getCurrentStepDescription(
                            sm.getSelectedArtifactFactory(),
                            sm.getCurrentArtifact(),
                            true
                        );

                        request.setAttribute("diagramm", true);

                    }
                    catch (ArtifactDatabaseInputException e) {
                        log.error(e, e);
                        request.setAttribute(
                            CommunicationKeys.REQUEST_EXCEPTION_INPUT_ID,
                            e.getMessage());
                    }
                    catch (Exception e) {
                        log.error(e, e);
                        request.setAttribute(
                            CommunicationKeys.REQUEST_EXCEPTION_MESSAGE_ID,
                            e.getMessage());
                    }

                    request.setAttribute("furthertargets", false);
                }
            }else{
                log.warn("SessionTimeout has occured");
                return sessionExhaustedForward(mapping, form, request, response);
            }
            return super.execute(mapping, form, request, response);
    }

}
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