/*
 * Created on 04/Sep/2004
 *
 */
package net.sourceforge.fenixedu.applicationTier.Servico.teacher;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import net.sourceforge.fenixedu.applicationTier.FenixService;
import net.sourceforge.fenixedu.applicationTier.Servico.exceptions.ExistingServiceException;
import net.sourceforge.fenixedu.applicationTier.Servico.exceptions.FenixServiceException;
import net.sourceforge.fenixedu.applicationTier.Servico.exceptions.InvalidSituationServiceException;
import net.sourceforge.fenixedu.domain.Attends;
import net.sourceforge.fenixedu.domain.ExecutionCourse;
import net.sourceforge.fenixedu.domain.Grouping;
import net.sourceforge.fenixedu.domain.StudentGroup;
import net.sourceforge.fenixedu.domain.student.Registration;

/**
 * @author joaosa & rmalo
 * 
 */

public class DeleteGroupingMembersByExecutionCourseID extends FenixService {

    public Boolean run(Integer executionCourseCode, Integer groupingCode) throws FenixServiceException {
	Grouping grouping = rootDomainObject.readGroupingByOID(groupingCode);

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

	ExecutionCourse executionCourse = rootDomainObject.readExecutionCourseByOID(executionCourseCode);

	if (executionCourse == null) {
	    throw new InvalidSituationServiceException();
	}

	List executionCourseStudentNumbers = new ArrayList();
	final List<Attends> attends = executionCourse.getAttends();
	for (final Attends attend : attends) {
	    final Registration registration = attend.getRegistration();
	    executionCourseStudentNumbers.add(registration.getNumber());
	}

	List attendsElements = new ArrayList();
	attendsElements.addAll(grouping.getAttends());
	Iterator iterator = attendsElements.iterator();
	while (iterator.hasNext()) {
	    Attends attend = (Attends) iterator.next();
	    if (executionCourseStudentNumbers.contains(attend.getRegistration().getNumber())) {
		boolean found = false;
		Iterator iterStudentsGroups = grouping.getStudentGroups().iterator();
		while (iterStudentsGroups.hasNext() && !found) {
		    final StudentGroup studentGroup = (StudentGroup) iterStudentsGroups.next();
		    if (studentGroup != null) {
			studentGroup.removeAttends(attend);
			found = true;
		    }
		}
		grouping.removeAttends(attend);
	    }
	}
	return true;
    }
}