package net.sourceforge.fenixedu.applicationTier.Servico.teacher;

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.InvalidArgumentsServiceException;
import net.sourceforge.fenixedu.applicationTier.Servico.exceptions.InvalidSituationServiceException;
import net.sourceforge.fenixedu.applicationTier.strategy.groupEnrolment.strategys.GroupEnrolmentStrategyFactory;
import net.sourceforge.fenixedu.applicationTier.strategy.groupEnrolment.strategys.IGroupEnrolmentStrategy;
import net.sourceforge.fenixedu.applicationTier.strategy.groupEnrolment.strategys.IGroupEnrolmentStrategyFactory;
import net.sourceforge.fenixedu.domain.Attends;
import net.sourceforge.fenixedu.domain.Grouping;
import net.sourceforge.fenixedu.domain.StudentGroup;

public class InsertStudentGroupMembers extends FenixService {

    public Boolean run(Integer executionCourseID, Integer studentGroupID, Integer groupPropertiesID, List<String> studentUsernames)
	    throws FenixServiceException {

	final StudentGroup studentGroup = rootDomainObject.readStudentGroupByOID(studentGroupID);
	if (studentGroup == null) {
	    throw new ExistingServiceException();
	}

	final Grouping grouping = studentGroup.getGrouping();
	final IGroupEnrolmentStrategyFactory enrolmentGroupPolicyStrategyFactory = GroupEnrolmentStrategyFactory.getInstance();
	final IGroupEnrolmentStrategy strategy = enrolmentGroupPolicyStrategyFactory.getGroupEnrolmentStrategyInstance(grouping);

	if (!strategy.checkStudentsUserNamesInGrouping(studentUsernames, grouping)) {
	    throw new InvalidArgumentsServiceException("error.editStudentGroupMembers");
	}

	for (final String studentUsername : studentUsernames) {
	    if (strategy.checkAlreadyEnroled(grouping, studentUsername)) {
		throw new InvalidSituationServiceException();
	    }
	    final Attends attend = grouping.getStudentAttend(studentUsername);
	    studentGroup.addAttends(attend);
	}

	return Boolean.TRUE;
    }

}