from rest_framework.decorators import api_view
from rest_framework.generics import get_object_or_404
from rest_framework.response import Response

from vbv_lernwelt.core.serializers import UserSerializer
from vbv_lernwelt.course.models import CourseSession
from vbv_lernwelt.learning_mentor.content.praxis_assignment import (
    get_praxis_assignments,
)
from vbv_lernwelt.learning_mentor.models import LearningMentor
from vbv_lernwelt.learning_mentor.serializers import PraxisAssignmentStatusSerializer


@api_view(["GET"])
def mentor_summary(request, course_session_id: int):
    if not request.user.is_authenticated:
        return Response(status=403)

    if request.method == "GET":
        course_session = CourseSession.objects.get(id=course_session_id)

        mentor = get_object_or_404(
            LearningMentor, mentor=request.user, course=course_session.course
        )

        participants = mentor.participants.filter(course_session=course_session)
        users = [p.user for p in participants]

        praxis_assignments = get_praxis_assignments(course_session, users)

        return Response(
            {
                "participants": [UserSerializer(user).data for user in users],
                "praxis_assignments": PraxisAssignmentStatusSerializer(
                    praxis_assignments, many=True
                ).data,
            }
        )