from rest_framework import serializers

from apps.course.access import user_has_course_access
from apps.course.models.course import get_localized_field
from apps.quiz.models import Question, Quiz, QuizParticipant







class QuizListSerializer(serializers.ModelSerializer):
    is_complated = serializers.SerializerMethodField()
    permission = serializers.SerializerMethodField()
    title = serializers.SerializerMethodField()
    description = serializers.SerializerMethodField()

    class Meta:
        model = Quiz
        fields = ['id', 'title', 'description', 'permission', 'each_question_timing', 'is_complated']

    def get_title(self, obj):
        request = self.context.get('request')
        lang = getattr(request, 'LANGUAGE_CODE', None) or 'en'
        return get_localized_field(lang, obj.title)

    def get_description(self, obj):
        request = self.context.get('request')
        lang = getattr(request, 'LANGUAGE_CODE', None) or 'en'
        return get_localized_field(lang, obj.description)

    def get_permission(self, obj):
        request = self.context.get('request')
        if not request or not request.user.is_authenticated:
            return False 
        user = request.user
        
        course = obj.course
        if not course:
            course_lesson = obj.lesson_computed
            if course_lesson:
                course = course_lesson.course
                
        if not course:
            return False
           
        if not user_has_course_access(user, course):
            return False
        
        participated = QuizParticipant.objects.filter(user=user, quiz=obj).exists()
        return not participated

    def get_is_complated(self, obj):
        request = self.context.get('request')
        if not request or not request.user.is_authenticated:
            return False 
        user = request.user
        return QuizParticipant.objects.filter(user=user, quiz=obj).exists()
        




class QuestionSerializer(serializers.ModelSerializer):
    options = serializers.SerializerMethodField()
    question = serializers.SerializerMethodField()

    def get_question(self, obj):
        request = self.context.get('request')
        lang = getattr(request, 'LANGUAGE_CODE', None) or 'en'
        return get_localized_field(lang, obj.question)

    def get_options(self, obj) -> list:
        request = self.context.get('request')
        lang = getattr(request, 'LANGUAGE_CODE', None) or 'en'
        return [
            {
                'id': i,
                'title': get_localized_field(lang, getattr(obj, f"option{i}"))
            } for i in range(1, 5)
        ]


    class Meta:
        model = Question
        fields = ['id', 'question', 'options', 'correct_answer']


class QuizSerializer(serializers.ModelSerializer):
    lesson = serializers.SerializerMethodField()
    questions = QuestionSerializer(many=True)
    permission = serializers.SerializerMethodField()
    title = serializers.SerializerMethodField()
    description = serializers.SerializerMethodField()

    class Meta:
        model = Quiz
        fields = ['id', 'permission', 'lesson', 'lesson_number', 'title', 'description', 'each_question_timing', 'questions']

    def get_title(self, obj):
        request = self.context.get('request')
        lang = getattr(request, 'LANGUAGE_CODE', None) or 'en'
        return get_localized_field(lang, obj.title)

    def get_description(self, obj):
        request = self.context.get('request')
        lang = getattr(request, 'LANGUAGE_CODE', None) or 'en'
        return get_localized_field(lang, obj.description)

    def get_lesson(self, obj):
        computed = obj.lesson_computed
        return computed.id if computed else None

    def get_permission(self, obj):
        request = self.context.get('request')
        if not request or not request.user.is_authenticated:
            return False 
        user = request.user
        
        course = obj.course
        if not course:
            course_lesson = obj.lesson_computed
            if course_lesson:
                course = course_lesson.course
                
        if not course:
            return False
            
        return user_has_course_access(user, course)