package net.sourceforge.fenixedu.domain.accessControl;

import java.util.Set;

import net.sourceforge.fenixedu.domain.Attends;
import net.sourceforge.fenixedu.domain.Person;
import net.sourceforge.fenixedu.domain.StudentGroup;
import net.sourceforge.fenixedu.domain.accessControl.groups.language.Argument;
import net.sourceforge.fenixedu.domain.accessControl.groups.language.GroupBuilder;
import net.sourceforge.fenixedu.domain.accessControl.groups.language.exceptions.GroupDynamicExpressionException;
import net.sourceforge.fenixedu.domain.accessControl.groups.language.operators.IdOperator;

public class StudentGroupStudentsGroup extends DomainBackedGroup<StudentGroup> {

    private static final long serialVersionUID = -7462413677592415379L;

    public StudentGroupStudentsGroup(StudentGroup object) {
	super(object);
    }

    private StudentGroup getStudentGroup() {
	return this.getObject();
    }

    @Override
    public Set<Person> getElements() {
	Set<Person> elements = super.buildSet();

	for (Attends attends : getStudentGroup().getAttends()) {
	    elements.add(attends.getRegistration().getPerson());
	}

	return super.freezeSet(elements);
    }

    @Override
    public boolean isMember(Person person) {
	if (person != null && person.hasStudent()) {
	    for (final Attends attends : getStudentGroup().getAttendsSet()) {
		if (attends.getRegistration().getStudent().getPerson() == person) {
		    return true;
		}
	    }
	}

	return false;
    }

    @Override
    protected Argument[] getExpressionArguments() {
	return new Argument[] { new IdOperator(getObject()) };
    }

    public static class Builder implements GroupBuilder {

	public Group build(Object[] arguments) {
	    try {
		return new StudentGroupStudentsGroup((StudentGroup) arguments[0]);
	    } catch (ClassCastException e) {
		throw new GroupDynamicExpressionException("accessControl.group.builder.studentGroupStudents.notStudentGroup",
			arguments[0].toString());
	    }
	}

	public int getMinArguments() {
	    return 0;
	}

	public int getMaxArguments() {
	    return 1;
	}

    }
}