package net.sourceforge.fenixedu.domain.studentCurriculum;

import java.math.BigDecimal;
import java.math.RoundingMode;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;

import net.sourceforge.fenixedu.domain.IEnrolment;
import net.sourceforge.fenixedu.domain.student.curriculum.ICurriculumEntry;

/**
 * 
 * @author rjmvo
 * 
 */
public final class ISCTEEnrolmentWrapperUtils {

    private ISCTEEnrolmentWrapperUtils() {
    }

    public static boolean hasEnrolmentWrappers(ICurriculumEntry entry, CurriculumGroup curriculumGroup) {
	return !getEnrolmentWrappers(entry, curriculumGroup).isEmpty();
    }

    private static Set<ISCTECurriculumEntryWrapper> getEnrolmentWrappers(ICurriculumEntry entry, CurriculumGroup curriculumGroup) {
	final Set<ISCTECurriculumEntryWrapper> result = new HashSet<ISCTECurriculumEntryWrapper>();

	for (final EnrolmentWrapper wrapper : getEnrolmentWrappers(entry)) {
	    if (wrapper instanceof ISCTECurriculumEntryWrapper && wrapper.hasCredits()
		    && !(wrapper.getCredits() instanceof ISCTETransitionCredits) && !wrapper.getCredits().isEquivalence()
		    && wrapper.getCredits().hasAnyDismissalFor(curriculumGroup)) {

		result.add((ISCTECurriculumEntryWrapper) wrapper);
	    }
	}

	return result;
    }

    public static BigDecimal getEnrolmentWrappersWeight(ICurriculumEntry entry, CurriculumGroup curriculumGroup) {
	BigDecimal credits = BigDecimal.ZERO;
	for (ISCTECurriculumEntryWrapper wrapper : getEnrolmentWrappers(entry, curriculumGroup)) {
	    credits = credits.add(wrapper.getWeight());
	}
	return credits.setScale(1, RoundingMode.HALF_EVEN);
    }

    public static BigDecimal getEnrolmentWrappersEctsCredits(ICurriculumEntry entry, CurriculumGroup curriculumGroup) {
	BigDecimal credits = BigDecimal.ZERO;
	for (ISCTECurriculumEntryWrapper wrapper : getEnrolmentWrappers(entry, curriculumGroup)) {
	    credits = credits.add(wrapper.getEctsCredits());
	}
	return credits.setScale(1, RoundingMode.HALF_EVEN);
    }

    private static Collection<? extends EnrolmentWrapper> getEnrolmentWrappers(ICurriculumEntry entry) {
	if (entry instanceof IEnrolment) {
	    return ((IEnrolment) entry).getEnrolmentWrappers();
	} else if (entry instanceof Dismissal) {
	    return ((Dismissal) entry).getDismissalWrappers();
	}
	return Collections.emptySet();
    }

}