from rest_framework import serializers
from rest_framework.exceptions import ValidationError

from users.serializers import PublicUserSerializer
from .models import Publication, Rating, Category

class CategorySerializer(serializers.ModelSerializer):
    class Meta:
        model = Category
        fields = ('pk', 'name')

class PublicationSerializer(serializers.ModelSerializer):
    category_detail = CategorySerializer(source="category", read_only=True)
    user_detail = PublicUserSerializer(source="user", read_only=True)
    average_score = serializers.IntegerField(read_only=True)

    class Meta:
        model = Publication
        fields = ('pk', 'image', 'video', 'content_type', 'status', 'average_score', 'description', 'is_pinned', 'user', 'user_detail', 'category', 'category_detail','time_created', 'time_updated')

        read_only_fields = ('time_created', 'time_updated', 'is_pinned', 'user', 'status')

class AdminPublicationSerializer(PublicationSerializer):
    class Meta(PublicationSerializer.Meta):
        read_only_fields = ('time_created', 'time_updated', 'user')

class RatePublicationSerializer(serializers.Serializer):
    score = serializers.IntegerField()
    publication = serializers.PrimaryKeyRelatedField(queryset=Publication.objects.only_publish())

    def validate_score(self, value):
        if value > 5 or value < 1:
            raise ValidationError('Score must be between 1 and 5')
        
        return value