/*
 * 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 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.DefaultInputParameter;
import de.intevation.gnv.artifactdatabase.objects.InputParameter;
import de.intevation.gnv.artifactdatabase.objects.OutputMode;
import de.intevation.gnv.artifactdatabase.objects.OutputParameter;

import java.io.OutputStream;

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;

/**
 * This controller calls the out operation of the server directly. Html img-tags
 * in jsp pages use this action to fetch charts and histograms.
 *
 * @author <a href="mailto:tim.englich@intevation.de">Tim Englich</a>
 *
 */
public class DoOutputAction extends ArtifactDatabaseActionBase {

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

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


    @Override
    public ActionForward execute(ActionMapping mapping, ActionForm form,
                                 HttpServletRequest request,
                                 HttpServletResponse response) throws Exception {
        if (isSessionExhausted(request)) {
            return sessionExhaustedForward(mapping, form, request, response);
        }

        log.debug("DoOutputAction.execute");
        try {
            String target   = request.getParameter("target");
            String mimeType = request.getParameter("mimetype");
            String mode     = request.getParameter("mode");

            log.debug("Target: " + target);
            log.debug("MimeType: " + mimeType);
            log.debug("ExportMode: " + mode);

            // TODO Check if is propper;

            SessionModel sm = SessionModelFactory.getInstance()
                    .getSessionModel(request);
            OutputMode outputMode = sm.getOutputMode(target);
            if (outputMode != null && outputMode.getMimeType().equals(mimeType)) {
                Collection<OutputParameter> inputParameter = outputMode
                        .getOutputParameters();
                Collection<InputParameter> ips = null;
                if (inputParameter != null) {
                    ips = new ArrayList<InputParameter>(inputParameter.size()+1);
                    Iterator<OutputParameter> it = inputParameter.iterator();
                    while (it.hasNext()) {
                        String name = it.next().getName();
                        String[] values = request.getParameterValues(name);
                        InputParameter ip = new DefaultInputParameter(name,
                                values);
                        ips.add(ip);
                    }

                    if (request.getParameter("bintype") != null) {
                        InputParameter ip = new DefaultInputParameter(
                            "bintype", request.getParameterValues("bintype"));
                        ips.add(ip);
                    }
                }

                ArtifactDatabaseClient adc = ArtifactDatabaseClientFactory
                        .getInstance()
                        .getArtifactDatabaseClient(getLocale(request));

                this.setHeaders(target, mimeType, response, request);

                OutputStream outputStream = response.getOutputStream();
                adc.doOutput(
                    sm.getSelectedArtifactFactory(),
                    sm.getCurrentArtifact(),
                    outputStream,
                    target,
                    mode,
                    mimeType,
                    ips);

                outputStream.flush();
                outputStream.close();
            } else {
                if (outputMode == null) {
                    log.error("Outputmode is not supported.");
                } else if (!outputMode.getMimeType().equals(mimeType)) {
                    log.error("MimeType " + mimeType
                              + " wis not supported.");
                }
                // TODO FIXME: Fehlerbehandlung
            }
            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);
        }
    }

    protected void setHeaders(String target, String mimeType,
                              HttpServletResponse response,
                              HttpServletRequest request) {
        response.setHeader("Content-Type", mimeType);
    }

}
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