/*
 * Created on 11:36:06,28/Fev/2005
 *
 * Author: Goncalo Luiz (goncalo@ist.utl.pt)
 * 
 */
package net.sourceforge.fenixedu.presentationTier.Action.externalServices;

import java.io.IOException;
import java.util.Collection;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import net.sourceforge.fenixedu._development.PropertiesManager;
import net.sourceforge.fenixedu.applicationTier.IUserView;
import net.sourceforge.fenixedu.applicationTier.Filtro.exception.FenixFilterException;
import net.sourceforge.fenixedu.applicationTier.Servico.exceptions.FenixServiceException;
import net.sourceforge.fenixedu.applicationTier.Servico.externalServices.ReadStudentGroupsExternalInformationByExecutionCourseIDAndStudentUsername;
import net.sourceforge.fenixedu.framework.factory.ServiceManagerServiceFactory;
import net.sourceforge.fenixedu.presentationTier.Action.BaseAuthenticationAction;
import net.sourceforge.fenixedu.presentationTier.Action.base.FenixAction;
import net.sourceforge.fenixedu.presentationTier.Action.exceptions.FenixActionException;

import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

import com.linkare.commons.metainfo.Linkare;
import com.thoughtworks.xstream.XStream;

/**
 * @author <a href="mailto:goncalo@ist.utl.pt">Goncalo Luiz </a>
 * 
 *         Created at 11:36:06, 28/Fev/2005
 */
public class InfoGroupsByExecutionCourse extends FenixAction {
    private final String SEPARATOR = ","; //$NON-NLS-1$
    private String studentUsername;
    private String studentPassword;
    private Integer[] executionCourseIds;

    public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response)
	    throws FenixActionException {

	this.readRequestInformation(request);

	StringBuilder buffer = new StringBuilder();
	try {

	    final String requestURL = request.getRequestURL().toString();
	    final String remoteHostName = BaseAuthenticationAction.getRemoteHostName(request);
	    IUserView userView = authenticate(this.studentUsername, this.studentPassword, requestURL, remoteHostName);
	    for (int i = 0; i < this.executionCourseIds.length; i++) {
		buffer.append(this.buildInfo(this.executionCourseIds[i], userView));
	    }
	    if (buffer.toString().equals(""))
		buffer = new StringBuilder("-1");

	} catch (Exception e) {
	    buffer = new StringBuilder();
	    buffer = new StringBuilder();
	    buffer.append("<error><cause>");
	    buffer.append(e.getMessage());
	    buffer.append("</cause></error>");
	}

	try {
	    sendAnswer(response, buffer.toString());
	} catch (IOException ex) {
	    throw new FenixActionException();
	}

	return null;
    }

    private String buildInfo(Integer integer, IUserView userView) throws FenixFilterException, FenixServiceException {

	Collection info = (Collection) ReadStudentGroupsExternalInformationByExecutionCourseIDAndStudentUsername.run(integer,
		userView.getUtilizador()); //$NON-NLS-1$
	XStream xstream = new XStream();
	String data = xstream.toXML(info);

	return data;
    }

    /**
     * @param response
     * @param result
     * @throws IOException
     */
    private void sendAnswer(HttpServletResponse response, String result) throws IOException {
	ServletOutputStream writer = response.getOutputStream();
	response.setContentType("text/plain");
	writer.print(result);
	writer.flush();
	response.flushBuffer();
    }

    /**
     * @param request
     * 
     */
    private void readRequestInformation(HttpServletRequest request) {
	this.studentUsername = request.getParameter("username"); //$NON-NLS-1$
	this.studentPassword = request.getParameter("password"); //$NON-NLS-1$
	String idsString = request.getParameter("ids"); //$NON-NLS-1$
	this.executionCourseIds = buildIdsArray(idsString);
    }

    private IUserView authenticate(String username, String password, String requestURL, String remoteHostName)
	    throws FenixServiceException, FenixFilterException {
	Object argsAutenticacao[] = { username, password, requestURL, remoteHostName };
	IUserView userView = (IUserView) ServiceManagerServiceFactory.executeService(PropertiesManager
		.getProperty("authenticationService"), argsAutenticacao);
	return userView;
    }

    @Linkare(author = "Paulo Zenida", comments = "Used Integer.valueOf() instead of new Integer()")
    private Integer[] buildIdsArray(String idsString) {
	Integer[] coursesIds = { Integer.valueOf(34811), Integer.valueOf(34661), Integer.valueOf(34950) };
	if (idsString != null) {
	    String[] ids = idsString.split(this.SEPARATOR);
	    coursesIds = new Integer[ids.length];
	    for (int i = 0; i < ids.length; i++)
		coursesIds[i] = Integer.valueOf(ids[i]);
	}
	return coursesIds;
    }
}