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.Collections;
import java.util.List;

import net.sourceforge.fenixedu.applicationTier.FenixService;
import net.sourceforge.fenixedu.applicationTier.Servico.exceptions.FenixServiceException;
import net.sourceforge.fenixedu.applicationTier.Servico.exceptions.InvalidSituationServiceException;
import net.sourceforge.fenixedu.applicationTier.Servico.exceptions.NotAuthorizedException;
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.ISiteComponent;
import net.sourceforge.fenixedu.dataTransferObject.InfoGrouping;
import net.sourceforge.fenixedu.dataTransferObject.InfoShift;
import net.sourceforge.fenixedu.dataTransferObject.InfoSiteGroupsByShift;
import net.sourceforge.fenixedu.dataTransferObject.InfoSiteShift;
import net.sourceforge.fenixedu.dataTransferObject.InfoSiteShiftsAndGroups;
import net.sourceforge.fenixedu.dataTransferObject.InfoSiteStudentGroup;
import net.sourceforge.fenixedu.dataTransferObject.InfoStudentGroup;
import net.sourceforge.fenixedu.domain.ExecutionCourse;
import net.sourceforge.fenixedu.domain.ExportGrouping;
import net.sourceforge.fenixedu.domain.Grouping;
import net.sourceforge.fenixedu.domain.Shift;
import net.sourceforge.fenixedu.domain.StudentGroup;

import org.apache.commons.beanutils.BeanComparator;

public class ReadShiftsAndGroups extends FenixService {

    @Checked("RolePredicates.STUDENT_AND_TEACHER_PREDICATE")
    @Service
    public static ISiteComponent run(Integer groupingCode, String username) throws FenixServiceException {
	final Grouping grouping = rootDomainObject.readGroupingByOID(groupingCode);
	if (grouping == null) {
	    throw new InvalidSituationServiceException();
	}

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

	if (!strategy.checkStudentInGrouping(grouping, username)) {
	    throw new NotAuthorizedException();
	}

	return run(grouping);
    }

    @Checked("RolePredicates.STUDENT_AND_TEACHER_PREDICATE")
    @Service
    public static InfoSiteShiftsAndGroups run(Grouping grouping) throws FenixServiceException {
	final InfoSiteShiftsAndGroups infoSiteShiftsAndGroups = new InfoSiteShiftsAndGroups();

	final List<InfoSiteGroupsByShift> infoSiteGroupsByShiftList = new ArrayList<InfoSiteGroupsByShift>();
	infoSiteShiftsAndGroups.setInfoSiteGroupsByShiftList(infoSiteGroupsByShiftList);
	infoSiteShiftsAndGroups.setInfoGrouping(InfoGrouping.newInfoFromDomain(grouping));

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

	if (strategy.checkHasShift(grouping)) {
	    for (final ExportGrouping exportGrouping : grouping.getExportGroupings()) {
		final ExecutionCourse executionCourse = exportGrouping.getExecutionCourse();
		for (final Shift shift : executionCourse.getAssociatedShifts()) {
		    if (shift.containsType(grouping.getShiftType())) {
			infoSiteGroupsByShiftList.add(createInfoSiteGroupByShift(shift, grouping));
		    }
		}
	    }
	    Collections.sort(infoSiteGroupsByShiftList, new BeanComparator("infoSiteShift.infoShift.nome"));

	    if (!grouping.getStudentGroupsWithoutShift().isEmpty()) {
		infoSiteGroupsByShiftList.add(createInfoSiteGroupByShift(grouping));
	    }
	} else {
	    infoSiteGroupsByShiftList.add(createInfoSiteGroupByShift(grouping));
	}

	return infoSiteShiftsAndGroups;

    }

    private static InfoSiteGroupsByShift createInfoSiteGroupByShift(final Shift shift, final Grouping grouping) {
	final InfoSiteGroupsByShift infoSiteGroupsByShift = new InfoSiteGroupsByShift();

	final InfoSiteShift infoSiteShift = new InfoSiteShift();
	infoSiteGroupsByShift.setInfoSiteShift(infoSiteShift);
	infoSiteShift.setInfoShift(InfoShift.newInfoFromDomain(shift));
	Collections.sort(infoSiteShift.getInfoShift().getInfoLessons());
	final List<StudentGroup> studentGroups = grouping.readAllStudentGroupsBy(shift);
	infoSiteShift.setNrOfGroups(calculateVacancies(grouping.getGroupMaximumNumber(), studentGroups.size()));

	infoSiteGroupsByShift.setInfoSiteStudentGroupsList(createInfoStudentGroupsList(studentGroups));

	return infoSiteGroupsByShift;
    }

    private static InfoSiteGroupsByShift createInfoSiteGroupByShift(final Grouping grouping) {
	final InfoSiteGroupsByShift infoSiteGroupsByShift = new InfoSiteGroupsByShift();

	final InfoSiteShift infoSiteShift = new InfoSiteShift();
	infoSiteGroupsByShift.setInfoSiteShift(infoSiteShift);
	final List<StudentGroup> studentGroups = grouping.getStudentGroupsWithoutShift();
	infoSiteShift.setNrOfGroups(calculateVacancies(grouping.getGroupMaximumNumber(), studentGroups.size()));

	infoSiteGroupsByShift.setInfoSiteStudentGroupsList(createInfoStudentGroupsList(studentGroups));

	return infoSiteGroupsByShift;
    }

    private static Object calculateVacancies(Integer groupMaximumNumber, int studentGroupsCount) {
	return (groupMaximumNumber != null) ? Integer.valueOf((groupMaximumNumber.intValue() - studentGroupsCount))
		: "Sem limite";
    }

    private static List<InfoSiteStudentGroup> createInfoStudentGroupsList(final List<StudentGroup> studentGroups) {
	final List<InfoSiteStudentGroup> infoSiteStudentGroups = new ArrayList<InfoSiteStudentGroup>();
	for (final StudentGroup studentGroup : studentGroups) {
	    final InfoSiteStudentGroup infoSiteStudentGroup = new InfoSiteStudentGroup();
	    infoSiteStudentGroup.setInfoStudentGroup(InfoStudentGroup.newInfoFromDomain(studentGroup));
	    infoSiteStudentGroups.add(infoSiteStudentGroup);
	}
	Collections.sort(infoSiteStudentGroups, new BeanComparator("infoStudentGroup.groupNumber"));
	return infoSiteStudentGroups;
    }

}