/*
 * Created on 28/Ago/2003
 *  
 */
package net.sourceforge.fenixedu.applicationTier.Servico.student;

import pt.ist.fenixWebFramework.services.Service;

import pt.ist.fenixWebFramework.security.accessControl.Checked;

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

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.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.dataTransferObject.InfoShift;
import net.sourceforge.fenixedu.dataTransferObject.InfoSiteShifts;
import net.sourceforge.fenixedu.domain.ExecutionCourse;
import net.sourceforge.fenixedu.domain.Grouping;
import net.sourceforge.fenixedu.domain.Shift;
import net.sourceforge.fenixedu.domain.StudentGroup;

/**
 * @author asnr and scpo
 * 
 */
public class ReadGroupingShifts extends FenixService {

    @Checked("RolePredicates.STUDENT_PREDICATE")
    @Service
    public static InfoSiteShifts run(Integer groupingCode, Integer studentGroupCode) throws FenixServiceException {

	InfoSiteShifts infoSiteShifts = new InfoSiteShifts();
	List infoShifts = new ArrayList();
	Grouping grouping = null;
	boolean result = false;

	StudentGroup studentGroup = null;
	grouping = rootDomainObject.readGroupingByOID(groupingCode);
	if (grouping == null) {
	    throw new ExistingServiceException();
	}
	if (studentGroupCode != null) {

	    studentGroup = rootDomainObject.readStudentGroupByOID(studentGroupCode);

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

	    infoSiteShifts.setOldShift(InfoShift.newInfoFromDomain(studentGroup.getShift()));
	}

	IGroupEnrolmentStrategyFactory enrolmentGroupPolicyStrategyFactory = GroupEnrolmentStrategyFactory.getInstance();
	IGroupEnrolmentStrategy strategy = enrolmentGroupPolicyStrategyFactory.getGroupEnrolmentStrategyInstance(grouping);

	if (strategy.checkHasShift(grouping)) {
	    List executionCourses = new ArrayList();
	    executionCourses = grouping.getExecutionCourses();

	    Iterator iterExecutionCourses = executionCourses.iterator();
	    List executionCourseShifts = new ArrayList();
	    while (iterExecutionCourses.hasNext()) {
		ExecutionCourse executionCourse = (ExecutionCourse) iterExecutionCourses.next();

		Set<Shift> someShifts = executionCourse.getAssociatedShifts();

		executionCourseShifts.addAll(someShifts);
	    }

	    List shifts = strategy.checkShiftsType(grouping, executionCourseShifts);
	    if (shifts == null || shifts.isEmpty()) {

	    } else {

		for (int i = 0; i < shifts.size(); i++) {
		    Shift shift = (Shift) shifts.get(i);
		    result = strategy.checkNumberOfGroups(grouping, shift);

		    if (result) {
			infoShifts.add(InfoShift.newInfoFromDomain(shift));
		    }
		}
	    }
	}

	infoSiteShifts.setShifts(infoShifts);
	return infoSiteShifts;

    }

}