AWSTemplateFormatVersion: "2010-09-09"
Transform: AWS::Serverless-2016-10-31
Description: >
  orders-app

  Stack containing Order Workflow Step Function and Tasks

Globals:
  Function:
    Timeout: 5
    Runtime: python3.9

Parameters:
  OrderTableName:
    Type: String
    Description: DynamoDB Order Table

  SubscriptionEmail:
    Type: String
    Description: Email endpoint for Order Notifications

Resources:
  ProcessPayment:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: src/process_payment/
      Handler: app.handler

  InitializeOrder:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: src/initialize_order/
      Handler: app.handler
      Environment:
        Variables:
          ORDER_TABLE: !Ref OrderTableName
          TOPIC_ARN: !Ref OrderNotificationTopic
      Policies:
        - DynamoDBWritePolicy:
            TableName: !Ref OrderTableName
        - SNSPublishMessagePolicy:
            TopicName: !GetAtt OrderNotificationTopic.TopicName

  CompleteOrder:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: src/complete_order/
      Handler: app.handler
      Environment:
        Variables:
          ORDER_TABLE: !Ref OrderTableName
          TOPIC_ARN: !Ref OrderNotificationTopic
      Policies:
        - DynamoDBWritePolicy:
            TableName: !Ref OrderTableName
        - SNSPublishMessagePolicy:
            TopicName: !GetAtt OrderNotificationTopic.TopicName

  CancelFailedOrder:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: src/cancel_failed_order/
      Handler: app.handler
      Environment:
        Variables:
          ORDER_TABLE: !Ref OrderTableName
          TOPIC_ARN: !Ref OrderNotificationTopic
      Policies:
        - DynamoDBWritePolicy:
            TableName: !Ref OrderTableName
        - SNSPublishMessagePolicy:
            TopicName: !GetAtt OrderNotificationTopic.TopicName

  OrderWorkflowSfn:
    Type: AWS::Serverless::StateMachine
    Properties:
      DefinitionUri: statemachine/order_workflow.asl.json
      DefinitionSubstitutions:
        InitializeOrderArn: !GetAtt InitializeOrder.Arn
        ProcessPaymentArn: !GetAtt ProcessPayment.Arn
        CompleteOrderArn: !GetAtt CompleteOrder.Arn
        CancelFailedOrderArn: !GetAtt CancelFailedOrder.Arn
      Policies:
        - LambdaInvokePolicy:
            FunctionName: !Ref InitializeOrder
        - LambdaInvokePolicy:
            FunctionName: !Ref ProcessPayment
        - LambdaInvokePolicy:
            FunctionName: !Ref CancelFailedOrder
        - LambdaInvokePolicy:
            FunctionName: !Ref CompleteOrder

  OrderNotificationTopic:
    Type: AWS::SNS::Topic
    Properties:
      Subscription:
        - Endpoint: !Ref SubscriptionEmail
          Protocol: "email"
      TopicName: !Join ["-", ["order-topic", !Select [2, !Split ["/", !Ref "AWS::StackId"]]]]

Outputs:
  OrderWorkflowSfnArn:
    Description: Order Workflow Step Function ARN
    Value: !Ref OrderWorkflowSfn
  OrderWorkflowSfnName:
    Description: Order Workflow Step Function Name
    Value: !GetAtt OrderWorkflowSfn.Name