AWSTemplateFormatVersion: "2010-09-09"
Transform: AWS::Serverless-2016-10-31
Description: >
  order-journey-service
  Sample SAM Template for order-journey-service
Parameters:
  CoreEventBusName:
    Type: String
    Description: Event bus used by application
    Default: Serverlesspresso
  Source:
    Type: String
    Description: Event bus source by application
    Default: 'awsserverlessda.serverlesspresso'

  JourneyBucket:
    Type: String
    Description: S3 Bucket for html files
    Default: 'serverlesspresso-order-journey-journeybucket-1lc9wg7eac1f4'
    
Globals:
  Function:
    Timeout: 3
    Runtime: nodejs14.x
    MemorySize: 128
    Environment:
      Variables:
        TableName: !Ref OrderJourneyEventsTable
        CoreEventBusName: !Ref CoreEventBusName


Resources:
  OrderJourneyService:
    Type: AWS::Serverless::StateMachine # More info about State Machine Resource: https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/sam-resource-statemachine.html
    Properties:
      DefinitionUri: statemachine/StepFunction.asl.json
      DefinitionSubstitutions:
        GenerateHtmlArn: !GetAtt GenerateHtml.Arn
        DDBPutItem: !Sub arn:${AWS::Partition}:states:::dynamodb:putItem
        DDBQuery: !Sub arn:${AWS::Partition}:states:::aws-sdk:dynamodb:query
        DDBTable: !Ref OrderJourneyEventsTable
        S3Bucket: !Ref JourneyBucket
        S3BucketPut: arn:aws:states:::aws-sdk:s3:putObject
      Policies: # Find out more about SAM policy templates: https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/serverless-policy-templates.html
        - LambdaInvokePolicy:
            FunctionName: !Ref GenerateHtml
        - DynamoDBWritePolicy:
            TableName: !Ref OrderJourneyEventsTable
        - DynamoDBReadPolicy:
            TableName: !Ref OrderJourneyEventsTable
        - S3WritePolicy:
            BucketName: !Ref JourneyBucket


            
   #RULE 1: Routes new order events to SFN
  EventRuleStartOrderJourneySFN:
    Type: AWS::Events::Rule
    Properties:
      Description: "Routes Start orderJourney SFN"
      EventBusName: !Ref CoreEventBusName
      State: "ENABLED"
      EventPattern:
        source:
          - !Ref Source
      Targets:
        - Arn: !Ref OrderJourneyService
          Id: "OrderJourneyService"
          RoleArn: !GetAtt EventBridgeIAMrole.Arn
  
  EventBridgeIAMrole:
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument:
        Version: 2012-10-17
        Statement:
        - Effect: Allow
          Principal:
            Service:
              !Sub events.amazonaws.com
          Action: sts:AssumeRole
      Path: /
      Policies:
      - PolicyName: OrderJourneyServiceStepFuntions
        PolicyDocument:
          Version: 2012-10-17
          Statement:
          - Effect: Allow
            Action:
            - states:StartExecution
            Resource:
            - !Ref OrderJourneyService

  GenerateHtml:
    Type: AWS::Serverless::Function # More info about Function Resource: https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/sam-resource-function.html
    Properties:
      CodeUri: functions/GenerateHtml/
      Handler: app.lambdaHandler
      Environment:
        Variables:
          s3Bucket: !Ref JourneyBucket
      Policies:
        - S3WritePolicy:
            BucketName: !Ref JourneyBucket


  OrderJourneyEventsTable:
    Type: AWS::DynamoDB::Table
    Properties:
      AttributeDefinitions:
      - AttributeName: PK
        AttributeType: S
      - AttributeName: SK
        AttributeType: S
      KeySchema:
      - AttributeName: PK
        KeyType: HASH
      - AttributeName: SK
        KeyType: RANGE
      BillingMode: PAY_PER_REQUEST    
      StreamSpecification:
        StreamViewType: NEW_AND_OLD_IMAGES   

  # Cloud front stuff      
  JourneyCloudFront:
    Type: AWS::CloudFront::Distribution
    Properties:
      DistributionConfig: 
        Enabled: true
        Comment: !Ref 'AWS::StackName'
        Origins:
          -   
            Id: JourneyBucket
            DomainName: !Sub ${JourneyBucket}.s3.${AWS::Region}.amazonaws.com
            S3OriginConfig:
              OriginAccessIdentity: !Sub 'origin-access-identity/cloudfront/${OriginAccessIdentity}'
        DefaultCacheBehavior:
          AllowedMethods: ["GET", "HEAD"]
          CachedMethods: ["GET", "HEAD"]
          ForwardedValues:
            Headers:
            - Access-Control-Request-Headers
            - Access-Control-Request-Method
            - Origin
            QueryString: true
          TargetOriginId: JourneyBucket
          ViewerProtocolPolicy: https-only
          Compress: true
          DefaultTTL: 5

  OriginAccessIdentity:
    Type: 'AWS::CloudFront::CloudFrontOriginAccessIdentity'
    Properties:
      CloudFrontOriginAccessIdentityConfig:
        Comment: 'Access S3 bucket content only through CloudFront'

Outputs:
  # Find out more about other implicit resources you can reference within SAM
  # https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/sam-specification-generated-resources.html
  OrderJourneyServiceArn:
    Description: "OrderJourneyService"
    Value: !Ref OrderJourneyService
  OrderJourneyServiceRole:
    Description: "IAM Role created for Stock Trading state machine based on the specified SAM Policy Templates"
    Value: !GetAtt OrderJourneyServiceRole.Arn