AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: Innovator Island - Flow & Traffic Controller (ride queue times service).

Resources:

  # Ride times are published to this topic
  FATcontroller:
    Type: AWS::SNS::Topic

  # Table to hold state between Lambda invocations
  DDBtable:
    Type: AWS::DynamoDB::Table
    Properties:
      AttributeDefinitions:
      - AttributeName: ID
        AttributeType: S
      KeySchema:
      - AttributeName: ID
        KeyType: HASH
      BillingMode: PROVISIONED
      ProvisionedThroughput:
        ReadCapacityUnits: 2
        WriteCapacityUnits: 2     
        
  # Function to simulate ride times and closures
  UpdateRides:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: fatController/
      Handler: app.handler
      Runtime: nodejs16.x
      MemorySize: 128
      Environment:
        Variables:
          DDBtable: !Ref DDBtable
          TopicArn: !Ref FATcontroller      
      Policies:
        - DynamoDBCrudPolicy:
            TableName: !Ref DDBtable  
        - Statement:
          - Effect: Allow
            Resource: !Ref FATcontroller
            Action:
              - sns:Publish                 
      Events:
        UpdateRidesEvent:
          Type: Schedule
          Properties:
            Schedule: rate(1 minute)

  # Lambda function for initializing DDB table content
  AppConfigurationLambda:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: initDB/
      Handler: app.handler
      Runtime: nodejs16.x
      Timeout: 15
      MemorySize: 128
      Environment:
        Variables:
          DDBtable: !Ref DDBtable
      Policies:
        - DynamoDBCrudPolicy:
            TableName: !Ref DDBtable                 

  # Triggers Lambda function after stack creation to add rides to DDB
  DeploymentCustomResource:
    Type: Custom::AppConfiguration
    Properties:
      ServiceToken: !GetAtt AppConfigurationLambda.Arn

Outputs:
  RideUpdatesSNStopic:
      Description: "SNS topic to receive ride uptime updates"
      Value: !Ref FATcontroller