from vbv_lernwelt.course.models import CourseSession, CourseSessionUser
from vbv_lernwelt.learnpath.models import LearningSequence


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

    if CourseSessionUser.objects.filter(
        course_session__course_id=course.id, user=user
    ).exists():
        return True

    return False


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

    course_sessions = CourseSession.objects.filter(coursesessionuser__user=user)

    return course_sessions


def is_circle_expert(user, learning_sequence, course) -> bool:
    if user.is_superuser:
        return True

    try:
        learning_sequence = LearningSequence.objects.get(id=learning_sequence)
    except LearningSequence.DoesNotExist:
        return False

    circle_id = learning_sequence.get_parent().circle.id

    try:
        CourseSessionUser.objects.get(
            course_session__id=course,
            user_id=user.id,
            role=CourseSessionUser.Role.EXPERT,
            expert__id=circle_id,
        )
    except CourseSessionUser.DoesNotExist:
        return False

    return True