from vbv_lernwelt.course.models import CourseSession, CourseSessionUser


def has_course_access_by_page_request(request, obj):
    return has_course_access(request.user, obj.specific.get_course())


def has_course_access(user, course):
    if user.is_superuser:
        return True

    # attached to CourseSession
    course_session = CourseSessionUser.objects.filter(
        course_session__course_id=course.id, user=user
    ).exists()

    if course_session:
        return True

    # TODO is trainer/expert of session

    # TODO check school class access
    return False


def course_sessions_for_user_qs(user):
    if user.is_superuser:
        return CourseSession.objects.all()

    course_sessions = CourseSession.objects.filter(
        course_session_user__user=user
    ).distinct()

    return course_sessions