package net.sourceforge.fenixedu.domain.studentCurriculum;

import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

import net.sourceforge.fenixedu.domain.CurricularCourse;
import net.sourceforge.fenixedu.domain.Enrolment;
import net.sourceforge.fenixedu.domain.Person;
import net.sourceforge.fenixedu.domain.accessControl.PermissionType;
import net.sourceforge.fenixedu.domain.accessControl.academicAdminOffice.AdministrativeOfficePermission;
import net.sourceforge.fenixedu.domain.accounting.events.AccountingEventsManager;
import net.sourceforge.fenixedu.domain.curricularRules.ICurricularRule;
import net.sourceforge.fenixedu.domain.curricularRules.MaximumNumberOfEctsInStandaloneCurriculumGroup;
import net.sourceforge.fenixedu.domain.curricularRules.executors.RuleResult;
import net.sourceforge.fenixedu.domain.curricularRules.executors.ruleExecutors.CurricularRuleLevel;
import net.sourceforge.fenixedu.domain.curricularRules.executors.ruleExecutors.EnrolmentResultType;
import net.sourceforge.fenixedu.domain.curriculum.EnrollmentCondition;
import net.sourceforge.fenixedu.domain.enrolment.EnroledCurriculumModuleWrapper;
import net.sourceforge.fenixedu.domain.enrolment.EnrolmentContext;
import net.sourceforge.fenixedu.domain.enrolment.IDegreeModuleToEvaluate;
import net.sourceforge.fenixedu.domain.exceptions.DomainException;

public class StudentCurricularPlanStandaloneEnrolmentManager extends StudentCurricularPlanEnrolment {

    public StudentCurricularPlanStandaloneEnrolmentManager(final EnrolmentContext enrolmentContext) {
	super(enrolmentContext);
    }

    @Override
    protected void assertEnrolmentPreConditions() {
	if (isResponsiblePersonManager()) {
	    return;
	}

	if (!isResponsiblePersonAcademicAdminOffice() && !isResponsibleInternationalRelationOffice()) {
	    throw new DomainException("error.StudentCurricularPlan.cannot.enrol.in.propaeudeutics");
	}

	final AdministrativeOfficePermission permission1 = getEnrolmentWithoutRulesPermission();
	if (permission1 == null || !permission1.isAppliable(getRegistration()) || !permission1.isMember(getResponsiblePerson())) {
	    checkRegistrationRegime();
	}

	final AdministrativeOfficePermission permission2 = getUpdateRegistrationAfterConclusionProcessPermission();
	if (permission2 != null && permission2.isAppliable(getRegistration())) {
	    if (!permission2.isMember(getResponsiblePerson())) {
		throw new DomainException("error.permissions.cannot.update.registration.after.conclusion.process");
	    }
	}

	checkEnrolingDegreeModules();
    }

    private void checkRegistrationRegime() {
	if (getRegistration().isPartialRegime(getExecutionYear())) {
	    throw new DomainException("error.StudentCurricularPlan.with.part.time.regime.cannot.enrol");
	}
    }

    private AdministrativeOfficePermission getEnrolmentWithoutRulesPermission() {
	final Person person = getResponsiblePerson();
	return person.getEmployeeAdministrativeOffice().getPermission(PermissionType.ENROLMENT_WITHOUT_RULES,
		person.getEmployeeCampus());
    }

    private void checkEnrolingDegreeModules() {
	for (final IDegreeModuleToEvaluate degreeModuleToEvaluate : enrolmentContext.getDegreeModulesToEvaluate()) {
	    if (degreeModuleToEvaluate.isEnroling()) {
		if (!degreeModuleToEvaluate.getDegreeModule().isCurricularCourse()) {
		    throw new DomainException(
			    "error.StudentCurricularPlanPropaeudeuticsEnrolmentManager.can.only.enrol.in.curricularCourses");
		}
		checkIDegreeModuleToEvaluate((CurricularCourse) degreeModuleToEvaluate.getDegreeModule());
	    }
	}
    }

    private void checkIDegreeModuleToEvaluate(final CurricularCourse curricularCourse) {
	if (getStudentCurricularPlan().isApproved(curricularCourse, getExecutionSemester())) {
	    throw new DomainException("error.already.aproved", curricularCourse.getName());
	}

	if (getStudentCurricularPlan().isEnroledInExecutionPeriod(curricularCourse, getExecutionSemester())) {
	    throw new DomainException("error.already.enroled.in.executionPeriod", curricularCourse.getName(),
		    getExecutionSemester().getQualifiedName());
	}
    }

    @Override
    protected void addEnroled() {
	if (!isEmptyDegree()) {
	    addEnroledFromStudentCurricularPlan();
	}
	addEnroledFromStandaloneGroup();
	changeCurricularRuleLevel();
    }

    /*
     * Change level accordding to current level
     */
    private void changeCurricularRuleLevel() {
	final CurricularRuleLevel currentLevel = enrolmentContext.getCurricularRuleLevel();

	if (currentLevel.equals(CurricularRuleLevel.STANDALONE_ENROLMENT_NO_RULES)) {
	    enrolmentContext.setCurricularRuleLevel(CurricularRuleLevel.ENROLMENT_NO_RULES);
	} else {
	    enrolmentContext.setCurricularRuleLevel(CurricularRuleLevel.ENROLMENT_WITH_RULES);
	}
    }

    private void addEnroledFromStudentCurricularPlan() {
	for (final IDegreeModuleToEvaluate degreeModuleToEvaluate : getStudentCurricularPlan().getDegreeModulesToEvaluate(
		getExecutionSemester())) {
	    enrolmentContext.addDegreeModuleToEvaluate(degreeModuleToEvaluate);
	}
    }

    private void addEnroledFromStandaloneGroup() {
	final StandaloneCurriculumGroup group = getStudentCurricularPlan().getStandaloneCurriculumGroup();
	for (final CurriculumLine curriculumLine : group.getChildCurriculumLines()) {
	    for (final IDegreeModuleToEvaluate module : curriculumLine.getDegreeModulesToEvaluate(getExecutionSemester())) {
		enrolmentContext.addDegreeModuleToEvaluate(module);
	    }
	}
    }

    @Override
    protected Map<IDegreeModuleToEvaluate, Set<ICurricularRule>> getRulesToEvaluate() {
	if (!enrolmentContext.hasDegreeModulesToEvaluate()) {
	    return Collections.emptyMap();
	}

	final Map<IDegreeModuleToEvaluate, Set<ICurricularRule>> result = new HashMap<IDegreeModuleToEvaluate, Set<ICurricularRule>>();
	for (final IDegreeModuleToEvaluate degreeModuleToEvaluate : enrolmentContext.getDegreeModulesToEvaluate()) {
	    if (degreeModuleToEvaluate.isEnroling() && degreeModuleToEvaluate.getDegreeModule().isCurricularCourse()) {
		result.put(degreeModuleToEvaluate, Collections.EMPTY_SET);
	    }
	}

	return result;
    }

    @Override
    protected RuleResult evaluateExtraRules(RuleResult actualResult) {
	if (actualResult.isFalse()) {
	    return actualResult;
	}

	if (isEmptyDegree()) {
	    return actualResult.and(new MaximumNumberOfEctsInStandaloneCurriculumGroup(getStandaloneCurriculumGroup()).evaluate(
		    getEnroledCurriculumGroup(), enrolmentContext));
	} else {
	    return actualResult;
	}
    }

    private boolean isEmptyDegree() {
	return getStudentCurricularPlan().isEmptyDegree();
    }

    private IDegreeModuleToEvaluate getEnroledCurriculumGroup() {
	return new EnroledCurriculumModuleWrapper(getRoot(), getExecutionSemester());
    }

    private StandaloneCurriculumGroup getStandaloneCurriculumGroup() {
	return getStudentCurricularPlan().getStandaloneCurriculumGroup();
    }

    @Override
    protected void performEnrolments(Map<EnrolmentResultType, List<IDegreeModuleToEvaluate>> degreeModulesToEnrolMap) {
	for (final Entry<EnrolmentResultType, List<IDegreeModuleToEvaluate>> entry : degreeModulesToEnrolMap.entrySet()) {
	    for (final IDegreeModuleToEvaluate degreeModuleToEvaluate : entry.getValue()) {
		if (degreeModuleToEvaluate.isEnroling() && degreeModuleToEvaluate.getDegreeModule().isCurricularCourse()) {
		    final CurricularCourse curricularCourse = (CurricularCourse) degreeModuleToEvaluate.getDegreeModule();

		    checkIDegreeModuleToEvaluate(curricularCourse);
		    new Enrolment(getStudentCurricularPlan(), degreeModuleToEvaluate.getCurriculumGroup(), curricularCourse,
			    getExecutionSemester(), EnrollmentCondition.VALIDATED, getResponsiblePerson().getIstUsername());
		}
	    }
	}

	new AccountingEventsManager().createStandaloneEnrolmentGratuityEvent(getStudentCurricularPlan(), getExecutionYear());
    }

    @Override
    protected void unEnrol() {

	// First remove Enrolments
	for (final CurriculumModule curriculumModule : enrolmentContext.getToRemove()) {
	    if (curriculumModule.isLeaf()) {
		curriculumModule.delete();
	    }
	}

	// After, remove CurriculumGroups
	for (final CurriculumModule curriculumModule : enrolmentContext.getToRemove()) {
	    if (!curriculumModule.isLeaf()) {
		curriculumModule.delete();
	    }
	}
    }

}