from rest_framework import serializers

from apps.quiz.models import QuizParticipant, ParticipantAnswer


class ParticipantAnswerSerializer(serializers.ModelSerializer):
    class Meta:
        model = ParticipantAnswer
        fields = ['question', 'option_num', 'at_time', 'answer_timing']



class QuizParticipantSerializer(serializers.ModelSerializer):
    user = serializers.HiddenField(default=serializers.CurrentUserDefault())
    answers = ParticipantAnswerSerializer(many=True)

    def validate_quiz(self, obj):
        if QuizParticipant.objects.filter(quiz=obj, user=self.context['request'].user).exists():
            raise serializers.ValidationError('you have already participated in the quiz')

        return obj

    class Meta:
        model = QuizParticipant
        fields = [
            'quiz', 'user', 'started_at', 'ended_at', 'total_timing',
            'question_score', 'timing_score', 'total_score',
            'answers',
        ]

    def create(self, validated_data):
        answers = validated_data.pop('answers', [])
        obj = super().create(validated_data)
        answers_objs = []
        for ans in answers:
            answers_objs.append(
                ParticipantAnswer(
                    participant=obj,
                    **ans,
                )
            )

        ParticipantAnswer.objects.bulk_create(answers_objs)

        return obj