# simple class with no models mappings
class LayerAuthSerializer(serializers.Serializer):
    nonce = serializers.CharField()
    display_name = serializers.CharField(required=False)
    avatar_url=serializers.CharField(required=False)


# a complex class definition
class CreateUserSerializer(serializers.Serializer):
	"""
	Serializer for create user request
	"""
	email = serializers.CharField(required=True)
	password = serializers.CharField(required=True)
	gravatar_url = serializers.CharField(required=False)

	def create(self, validated_data):
		# if user has used this number previously to authenticate,
		# then change validation code and and set number as validated = false
		user = User.objects.create_user(email=validated_data['email'], password=validated_data['password'])

		# we detect if user has a profile picture from gravatar
		gravatar_url = validated_data.pop('gravatar_url', None)
		if gravatar_url is not None:
			photo = download_gravatar(gravatar_url)
			user.profile_avatar = photo
			user.save()
		return user

	def to_internal_value(self, data):
		super(CreateUserSerializer, self).to_internal_value(data)
		if not data.get('password'):
			raise serializers.ValidationError({
                'error': 'Password is required',
                'code' : exception_handler.ERROR_DATA_INCONSISTENCY
            })
		email = data.get('email')
		if not email:
			raise serializers.ValidationError({
	            'error': 'Email is required',
	            'code' : exception_handler.ERROR_DATA_INCONSISTENCY
		        })

		return data