/*
 * Created on 25/Set/2003, 11:52:14 By Goncalo Luiz gedl [AT] rnl [DOT] ist [DOT] utl [DOT] pt
 */
package net.sourceforge.fenixedu.presentationTier.Action.Seminaries;

import java.util.LinkedList;
import java.util.List;

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

import net.sourceforge.fenixedu.applicationTier.IUserView;
import net.sourceforge.fenixedu.applicationTier.Filtro.exception.FenixFilterException;
import net.sourceforge.fenixedu.applicationTier.Servico.Seminaries.ChangeCandidacyApprovanceStatus;
import net.sourceforge.fenixedu.applicationTier.Servico.exceptions.FenixServiceException;
import net.sourceforge.fenixedu.dataTransferObject.Seminaries.SelectCandidaciesDTO;
import net.sourceforge.fenixedu.presentationTier.Action.base.FenixDispatchAction;
import net.sourceforge.fenixedu.presentationTier.Action.exceptions.FenixActionException;
import net.sourceforge.fenixedu.presentationTier.Action.resourceAllocationManager.utils.ServiceUtils;

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

import pt.ist.fenixWebFramework.security.UserView;

/**
 * @author Goncalo Luiz gedl [AT] rnl [DOT] ist [DOT] utl [DOT] pt Created at
 *         25/Set/2003, 11:52:14
 */
// TODO: this action IS NOT ready to handle multiple seminaries. It will need a
// select box to select which seminary's candidacies to view
public class SelectCandidacies extends FenixDispatchAction {
    public ActionForward prepare(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response)
	    throws FenixActionException, FenixFilterException {
	IUserView userView = UserView.getUser();
	ActionForward destiny = null;
	String seminaryIDString = request.getParameter("seminaryID");
	Integer seminaryID = null;
	Integer wildcard = Integer.valueOf(-1);
	try {
	    seminaryID = Integer.valueOf(seminaryIDString);
	} catch (NumberFormatException ex) {
	    seminaryID = wildcard;
	}

	Object[] args = { Boolean.valueOf(false), seminaryID };
	try {
	    SelectCandidaciesDTO serviceResult = (SelectCandidaciesDTO) ServiceUtils.executeService("SelectCandidaciesService",
		    args);
	    request.setAttribute("seminaries", serviceResult.getSeminaries());
	    request.setAttribute("candidacies", serviceResult.getCandidacies());
	} catch (FenixServiceException e) {
	    throw new FenixActionException(e);
	}

	destiny = mapping.findForward("showSelectCandidacies");
	return destiny;
    }

    public List getNewSelectedStudents(Integer[] selectedStudents, Integer[] previousUnselected) {
	List newSelectedStudents = new LinkedList();
	for (int i = 0; i < selectedStudents.length; i++) {
	    for (int j = 0; j < previousUnselected.length; j++) {
		if (selectedStudents[i].equals(previousUnselected[j])) {
		    newSelectedStudents.add(selectedStudents[i]);
		    break;
		}
	    }
	}
	return newSelectedStudents;
    }

    public List getNewUnselectedStudents(Integer[] selectedStudents, Integer[] previousSelected) {
	List newUnselectedStudents = new LinkedList();
	for (int i = 0; i < previousSelected.length; i++)
	    newUnselectedStudents.add(previousSelected[i]);
	//
	//
	for (int i = 0; i < previousSelected.length; i++) {
	    for (int j = 0; j < selectedStudents.length; j++) {
		if (previousSelected[i].equals(selectedStudents[j])) {
		    newUnselectedStudents.remove(previousSelected[i]);
		    break;
		}
	    }
	}
	return newUnselectedStudents;
    }

    public ActionForward changeSelection(ActionMapping mapping, ActionForm form, HttpServletRequest request,
	    HttpServletResponse response) throws FenixActionException, FenixFilterException {
	IUserView userView = getUserView(request);
	DynaActionForm selectCases = (DynaActionForm) form;
	Integer[] selectedStudents = null;
	Integer[] previousSelected = null;
	Integer[] previousUnselected = null;
	try {
	    selectedStudents = (Integer[]) selectCases.get("selectedStudents");
	    previousSelected = (Integer[]) selectCases.get("previousSelected");
	    previousUnselected = (Integer[]) selectCases.get("previousUnselected");
	} catch (Exception ex) {
	    ex.printStackTrace();
	    throw new FenixActionException();
	}
	if (selectedStudents == null || previousSelected == null || previousUnselected == null) {
	    throw new FenixActionException();
	}
	List changedStatusCandidaciesIds = new LinkedList();
	changedStatusCandidaciesIds.addAll(this.getNewSelectedStudents(selectedStudents, previousUnselected));
	changedStatusCandidaciesIds.addAll(this.getNewUnselectedStudents(selectedStudents, previousSelected));

	ChangeCandidacyApprovanceStatus.run(changedStatusCandidaciesIds);

	// modified by Fernanda Quitério
	// destiny = mapping.findForward("prepareForm");
	// return destiny;
	return prepare(mapping, form, request, response);
    }
}