AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: Step function workflow that replays events the same time they happened

Parameters:
  EventBusName:
    Description: 'Required event bus name to send events to'
    Type: String
    Default: default

Resources:

  TransformEvents:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: src/
      Handler: app.handler
      Runtime: nodejs14.x
      Timeout: 3
      Policies: 
        - CloudWatchPutMetricPolicy: {}
        
  EventBridgeReplayTimer:
    Type: AWS::Serverless::StateMachine
    Properties:
      DefinitionUri: statemachine/statemachine.asl.json
      DefinitionSubstitutions:
        functionArn: !GetAtt TransformEvents.Arn
        EventBusName: !Ref EventBusName
      Role: !GetAtt WorkflowExecutionRole.Arn

  WorkflowExecutionRole:
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument:
        Version: 2012-10-17
        Statement:
          - Effect: Allow
            Principal:
              Service: states.amazonaws.com
            Action: sts:AssumeRole
      Policies:
        - PolicyName: AllowEventBridgePutEvents
          PolicyDocument:
            Version: 2012-10-17
            Statement:
              - Effect: Allow
                Action: events:PutEvents
                Resource: !Sub arn:aws:events:${AWS::Region}:${AWS::AccountId}:event-bus/${EventBusName}
        - PolicyName: LambdaExecute
          PolicyDocument:
            Version: "2012-10-17"
            Statement:
              - Effect: Allow
                Action:
                  - "lambda:InvokeFunction"
                Resource: !GetAtt TransformEvents.Arn        

Outputs:
  EventBridgeReplayTimerArn:
    Value: !Ref EventBridgeReplayTimer