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

}