from django.shortcuts import get_object_or_404
from rest_framework.decorators import api_view, permission_classes
from rest_framework.exceptions import PermissionDenied
from rest_framework.permissions import IsAuthenticated
from rest_framework.response import Response

from vbv_lernwelt.core.models import User
from vbv_lernwelt.learning_mentor.models import LearningMentor
from vbv_lernwelt.learnpath.models import LearningUnit
from vbv_lernwelt.self_evaluation_feedback.models import SelfEvaluationFeedback


@api_view(["POST"])
@permission_classes([IsAuthenticated])
def start_self_evaluation_feedback(request):
    learning_unit_id = request.data.get("learning_unit_id")
    feedback_provider_user_id = request.data.get("feedback_provider_user_id")

    learning_unit = get_object_or_404(LearningUnit, id=learning_unit_id)
    feedback_provider_user = get_object_or_404(User, id=feedback_provider_user_id)

    if not LearningMentor.objects.filter(
        course=learning_unit.get_course(),
        mentor=feedback_provider_user,
        participants__user=request.user,
    ).exists():
        raise PermissionDenied()

    SelfEvaluationFeedback.objects.create(
        feedback_requester_user=request.user,
        feedback_provider_user=feedback_provider_user,
        learning_unit=learning_unit,
    )

    # TODO: Create notification for feedback_provider_user

    return Response({"success": True})


@api_view(["GET"])
@permission_classes([IsAuthenticated])
def list_self_evaluation_feedback(request):
    feedbacks = SelfEvaluationFeedback.objects.filter(
        feedback_provider_user=request.user
    )

    # TODO continue here

    return Response({"success": True})