/**
 * 
 */
package net.sourceforge.fenixedu.predicates;

import java.util.ArrayList;
import java.util.Collection;

import com.linkare.commons.metainfo.Linkare;

import net.sourceforge.fenixedu.domain.CompetenceCourse;
import net.sourceforge.fenixedu.domain.DegreeCurricularPlan;
import net.sourceforge.fenixedu.domain.Person;
import net.sourceforge.fenixedu.domain.accessControl.Group;
import net.sourceforge.fenixedu.domain.accessControl.GroupUnion;
import net.sourceforge.fenixedu.domain.person.RoleType;
import net.sourceforge.fenixedu.injectionCode.AccessControl;
import net.sourceforge.fenixedu.injectionCode.AccessControlPredicate;
import net.sourceforge.fenixedu.injectionCode.IGroup;

/**
 * @author - Shezad Anavarali (shezad@ist.utl.pt)
 * 
 */
public class CompetenceCoursePredicates {

    public static final AccessControlPredicate<CompetenceCourse> readPredicate = new AccessControlPredicate<CompetenceCourse>() {

	public boolean evaluate(CompetenceCourse competenceCourse) {

	    if (!competenceCourse.isBolonha()) {
		return true;
	    }

	    Person person = AccessControl.getPerson();
	    if (person.hasRole(RoleType.SCIENTIFIC_COUNCIL)) {
		return true;
	    }

	    boolean isDegreeCurricularPlansMember = false;
	    isDegreeCurricularPlansMember = isMemberOfDegreeCurricularPlansGroup(person);

	    boolean isCompetenceGroupMember = isMemberOfCompetenceCourseGroup(competenceCourse, person);

	    switch (competenceCourse.getCurricularStage()) {
	    case DRAFT:
		return isCompetenceGroupMember;
	    case PUBLISHED:
		return isCompetenceGroupMember || isDegreeCurricularPlansMember;
	    case APPROVED:
		return true;
	    default:
		return false;
	    }

	}

    };

    public static final AccessControlPredicate<CompetenceCourse> writePredicate = new AccessControlPredicate<CompetenceCourse>() {

	public boolean evaluate(CompetenceCourse competenceCourse) {

	    if (!competenceCourse.isBolonha()) {
		return true;
	    }

	    Person person = AccessControl.getPerson();

	    if (person.hasRole(RoleType.MANAGER)) {
		return true;
	    }

	    boolean isDegreeCurricularPlansMember = false;
	    isDegreeCurricularPlansMember = isMemberOfDegreeCurricularPlansGroup(person);

	    boolean isCompetenceGroupMember = isMemberOfCompetenceCourseGroup(competenceCourse, person);

	    switch (competenceCourse.getCurricularStage()) {
	    case DRAFT:
		return isCompetenceGroupMember;
	    case PUBLISHED:
		return isCompetenceGroupMember || isDegreeCurricularPlansMember;
	    case APPROVED:
		return person.hasRole(RoleType.SCIENTIFIC_COUNCIL);
	    default:
		return false;
	    }

	}
    };

    public static final AccessControlPredicate<CompetenceCourse> editCurricularStagePredicate = new AccessControlPredicate<CompetenceCourse>() {

	@Linkare(author = "Paulo Zenida", comments = "Included skip operation for manager roles")
	public boolean evaluate(CompetenceCourse competenceCourse) {

	    Person person = AccessControl.getPerson();
	    if (person.hasRole(RoleType.MANAGER)) {
		return true;
	    }

	    boolean isCompetenceGroupMember = isMemberOfCompetenceCourseGroup(competenceCourse, person);

	    switch (competenceCourse.getCurricularStage()) {
	    case DRAFT:
		return isCompetenceGroupMember;
	    case PUBLISHED:
		return isCompetenceGroupMember || person.hasRole(RoleType.SCIENTIFIC_COUNCIL);
	    case APPROVED:
		return person.hasRole(RoleType.SCIENTIFIC_COUNCIL);
	    default:
		return false;
	    }

	}

    };

    private static boolean isMemberOfDegreeCurricularPlansGroup(Person person) {
	Collection<DegreeCurricularPlan> degreeCurricularPlans = DegreeCurricularPlan.readNotEmptyDegreeCurricularPlans();

	Collection<IGroup> groups = new ArrayList<IGroup>();
	for (DegreeCurricularPlan plan : degreeCurricularPlans) {
	    Group curricularPlanMembersGroup = plan.getCurricularPlanMembersGroup();
	    if (curricularPlanMembersGroup != null) {
		groups.add(curricularPlanMembersGroup);
	    }
	}

	return new GroupUnion(groups).isMember(person);
    }

    private static boolean isMemberOfCompetenceCourseGroup(CompetenceCourse competenceCourse, Person person) {
	Group competenceCourseMembersGroup = competenceCourse.getDepartmentUnit().getDepartment()
		.getCompetenceCourseMembersGroup();
	if (competenceCourseMembersGroup != null) {
	    return competenceCourseMembersGroup.isMember(person);
	}
	return false;
    }

}