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

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;

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;

/**
 * @author Tim Englich <tim.englich@intevation.de>
 * 
 */
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();
    }

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

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

            // 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());
                    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);
                    }
                }

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

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

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

                outputStream.flush();
                outputStream.close();
            } else {
                if (outputMode == null) {
                    log.error("Outputmode wird nicht unterst�tzt.");
                } else if (!outputMode.getMimeType().equals(mimeType)) {
                    log.error("MimeType " + mimeType
                              + " wird nicht unterst�tzt.");
                }
                // 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);
    }

}