class UserSerializer(serializers.ModelSerializer):
    email = serializers.EmailField(max_length=50, allow_blank=False, required=True)
    full_name = serializers.CharField(max_length=150, allow_blank=False, required=True)
    password = serializers.CharField(allow_blank=False, write_only=True, required=True)
    is_active = serializers.BooleanField(required=False)
    # category_tags = ??

    class Meta:
        model = User
        fields = ('id', 'email', 'full_name', 'is_active', 'is_online', 'joined', 'category_tags', 'password')
        write_only_fields = ('password',)
        read_only_fields = ('id', 'joined', 'is_online')

        validators = [
            UniqueTogetherValidator(
                queryset = User.objects.all(),
                fields = ('email',),
                message= "This email is already registered"
            )
        ]

    def create(self, validated_data):
        generated_password = get_random_string(length=8)

        user = User.objects.create(
            email = validated_data['email'],
            full_name = validated_data['full_name']
        )

        user.set_password(generated_password)
        user.save()
        return user

    def update(self, instance, validated_data):
        instance.email = validated_data.get('email', instance.email)
        instance.full_name = validated_data.get('full_name', instance.full_name)
        instance.is_active = validated_data.get('is_active', instance.is_active)


        if is_password_usable(validated_data.get('password', instance.password)) != True:
            instance.set_password(validated_data.get('password', instance.password))

        instance.save()
        return instance