from apps.course.models import Participant


def user_has_course_access(user, course):
    if not user or not getattr(user, 'is_authenticated', False):
        return False

    if user.is_staff or user.is_superuser:
        return True

    if course.professor_id == user.id:
        return True

    return Participant.objects.filter(
        student_id=user.id,
        course=course,
        is_active=True,
    ).exists()