/*
 * Created on 12/Ago/2003
 *
 */
package net.sourceforge.fenixedu.applicationTier.Servico.teacher;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import net.sourceforge.fenixedu.applicationTier.FenixService;
import net.sourceforge.fenixedu.applicationTier.Servico.exceptions.ExistingServiceException;
import net.sourceforge.fenixedu.dataTransferObject.ISiteComponent;
import net.sourceforge.fenixedu.dataTransferObject.InfoSiteStudentGroup;
import net.sourceforge.fenixedu.dataTransferObject.InfoSiteStudentInformation;
import net.sourceforge.fenixedu.domain.Attends;
import net.sourceforge.fenixedu.domain.Grouping;
import net.sourceforge.fenixedu.domain.Person;
import net.sourceforge.fenixedu.domain.StudentGroup;
import net.sourceforge.fenixedu.domain.student.Registration;

import org.apache.commons.beanutils.BeanComparator;

/**
 * @author ansr and scpo
 * 
 */
public class PrepareCreateStudentGroup extends FenixService {

    public ISiteComponent run(Integer executionCourseCode, Integer groupPropertiesCode) throws ExistingServiceException {

	final Grouping grouping = rootDomainObject.readGroupingByOID(groupPropertiesCode);

	if (grouping == null) {
	    throw new ExistingServiceException();
	}

	final List<StudentGroup> allStudentsGroups = grouping.getStudentGroups();
	final List<Attends> attendsGrouping = new ArrayList(grouping.getAttends());
	for (final StudentGroup studentGroup : allStudentsGroups) {
	    for (Attends attend : studentGroup.getAttends()) {
		attendsGrouping.remove(attend);
	    }
	}

	final List<InfoSiteStudentInformation> infoStudentInformationList = new ArrayList<InfoSiteStudentInformation>(
		attendsGrouping.size());
	for (Attends attend : attendsGrouping) {
	    final Registration registration = attend.getRegistration();
	    final Person person = registration.getPerson();
	    InfoSiteStudentInformation infoSiteStudentInformation = new InfoSiteStudentInformation();
	    infoSiteStudentInformation.setEmail(person.getEmail());
	    infoSiteStudentInformation.setName(person.getName());
	    infoSiteStudentInformation.setNumber(registration.getNumber());
	    infoSiteStudentInformation.setUsername(person.getUsername());
	    infoSiteStudentInformation.setPersonID(person.getIdInternal());
	    infoStudentInformationList.add(infoSiteStudentInformation);
	}

	Collections.sort(infoStudentInformationList, new BeanComparator("number"));

	InfoSiteStudentGroup infoSiteStudentGroup = new InfoSiteStudentGroup();
	infoSiteStudentGroup.setInfoSiteStudentInformationList(infoStudentInformationList);

	final int groupNumber = grouping.findMaxGroupNumber() + 1;
	infoSiteStudentGroup.setNrOfElements(Integer.valueOf(groupNumber));

	return infoSiteStudentGroup;

    }

}