/**
 *
 */
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.ArtifactDescription;
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);
    }
    

}