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.Calendar;
import java.util.List;

import net.sourceforge.fenixedu.applicationTier.FenixService;
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.ExecutionCourse;
import net.sourceforge.fenixedu.domain.ExecutionSemester;
import net.sourceforge.fenixedu.domain.Grouping;
import net.sourceforge.fenixedu.domain.student.Registration;

public class ReadEnroledExecutionCourses extends FenixService {

    @Checked("RolePredicates.STUDENT_PREDICATE")
    @Service
    public static List<ExecutionCourse> run(final Registration registration) {

	final ExecutionSemester executionSemester = ExecutionSemester.readActualExecutionSemester();
	final List<ExecutionCourse> result = new ArrayList<ExecutionCourse>();

	for (final Attends attend : registration.getAssociatedAttendsSet()) {
	    final ExecutionCourse executionCourse = attend.getExecutionCourse();

	    if (executionCourse.getExecutionPeriod() == executionSemester) {
		final List<Grouping> groupings = executionCourse.getGroupings();

		if (checkPeriodEnrollment(groupings) && checkStudentInAttendsSet(groupings, registration)) {
		    result.add(executionCourse);
		}
	    }
	}
	return result;
    }

    private static boolean checkPeriodEnrollment(final Grouping grouping) {
	final IGroupEnrolmentStrategyFactory enrolmentGroupPolicyStrategyFactory = GroupEnrolmentStrategyFactory.getInstance();
	final IGroupEnrolmentStrategy strategy = enrolmentGroupPolicyStrategyFactory.getGroupEnrolmentStrategyInstance(grouping);
	return strategy.checkEnrolmentDate(grouping, Calendar.getInstance());
    }

    private static boolean checkPeriodEnrollment(final List<Grouping> allGroupProperties) {
	for (final Grouping grouping : allGroupProperties) {
	    if (checkPeriodEnrollment(grouping)) {
		return true;
	    }
	}
	return false;
    }

    private static boolean checkStudentInAttendsSet(final List<Grouping> allGroupProperties, final Registration registration) {
	for (final Grouping grouping : allGroupProperties) {
	    if (grouping.getStudentAttend(registration) != null) {
		return true;
	    }
	}
	return false;
    }

}