AWSTemplateFormatVersion: "2010-09-09"
Transform: AWS::Serverless-2016-10-31
Description: Serverless patterns - SNS to Lambda

Resources:
  # Define the SNS topic
  MySnsTopic:
    Type: AWS::SNS::Topic
    Properties:
      Subscription:
        - Protocol: lambda
          Endpoint: !GetAtt LambdaFn.Arn

  # Provide permission for SNS to invoke the Lambda function
  TopicConsumerFunction1Permission:
    Type: "AWS::Lambda::Permission"
    Properties:
      Action: "lambda:InvokeFunction"
      FunctionName: !Ref LambdaFn
      Principal: sns.amazonaws.com

  # Define the consumer Lambda function
  LambdaFn:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: hello_world/
      Handler: app.handler
      Runtime: python3.10

Outputs:
  TopicConsumerFunction1Name:
    Description: LambdaFn function name
    Value: !Ref LambdaFn

  SNStopicName:
    Description: SNS topic name
    Value: !GetAtt MySnsTopic.TopicName

  SNStopicARN:
    Description: SNS topic ARN
    Value: !Ref MySnsTopic