AWSTemplateFormatVersion: "2010-09-09"
Transform: AWS::Serverless-2016-10-31
Description: feedback-app-backend serverless application
Globals:
  Function:
    Runtime: nodejs12.x
    MemorySize: 128
    Timeout: 100
    Tracing: Active

Resources:
  FeedbackStateMachine:
    Type: AWS::Serverless::StateMachine
    Properties:
      DefinitionUri: statemachine/feedback-sm.json
      DefinitionSubstitutions:
        SubmitFeedbackServiceFunctionArn: !GetAtt SubmitFeedbackServiceFunction.Arn
        WebHookNotificationServiceFunctionArn: !GetAtt WebHookNotificationServiceFunction.Arn
        SentimentAnalysisServiceFunctionArn: !GetAtt SentimentAnalysisServiceFunction.Arn
      Events:
        Service:
          Type: Api
          Properties:
            Path: /submit-feedback
            Method: POST
            RestApiId:
              Ref: FeedbackAPI
      Tracing:
        Enabled: True
      Policies:
        - LambdaInvokePolicy:
            FunctionName: !Ref SentimentAnalysisServiceFunction
        - LambdaInvokePolicy:
            FunctionName: !Ref SubmitFeedbackServiceFunction
        - LambdaInvokePolicy:
            FunctionName: !Ref WebHookNotificationServiceFunction
        - Statement:
            - Sid: EnableXRayOnExistingStateMachinePolicy
              Effect: Allow
              Action:
                - xray:PutTraceSegments
                - xray:PutTelemetryRecords
                - xray:GetSamplingRules
                - xray:GetSamplingTargets
              Resource: "*"

  FeedbackAPI:
    Type: AWS::Serverless::Api
    Properties:
      StageName: Prod
      Cors:
        AllowMethods: "'POST, GET, OPTIONS'"
        AllowOrigin: "'*'"
        AllowHeaders: "'Content-Type,x-requested-with,Access-Control-Allow-Origin,Access-Control-Allow-Headers,Access-Control-Allow-Methods'"
        AllowCredentials: False
      EndpointConfiguration: EDGE
      Name: feedback-app-backend-api
      TracingEnabled: True

  WebHookNotificationServiceFunction:
    Type: AWS::Serverless::Function
    Properties:
      Description: The lambda function to process webhook notification
      Handler: app.webHookNotificationHandler
      CodeUri: webhooknotification-service/
      Environment:
        Variables:
          WEBHOOK_PARAM: !Ref WebhookURLSSMParameter
      Policies:
        - SSMParameterReadPolicy:
            ParameterName: !Ref WebhookURLSSMParameter
        - AWSXRayDaemonWriteAccess

  SentimentAnalysisServiceFunction:
    Type: AWS::Serverless::Function
    Properties:
      Description: This lambda function will carry out a sentitment analysis of the feedback text
      Handler: app.sentimentAnalysisHandler
      CodeUri: sentimentanalysis-service/
      Policies:
        - ComprehendBasicAccessPolicy: {}
        - AWSXRayDaemonWriteAccess

  SubmitFeedbackServiceFunction:
    Type: AWS::Serverless::Function
    Properties:
      Description: The lambda function to process feedback and add the feedback as an item in a DynamoDB table
      Handler: app.submitFeedbackHandler
      CodeUri: submitfeedback-service/
      Policies:
        - DynamoDBCrudPolicy:
            TableName: !Ref FeedbackDB
        - AWSXRayDaemonWriteAccess
      Environment:
        Variables:
          FEEDBACK_DB: !Ref FeedbackDB

  GetAllFeedbackServiceFunction:
    Type: AWS::Serverless::Function
    Properties:
      Description: The lambda function to get submitted feedbacks from the database
      Handler: app.getAllFeedbackHandler
      CodeUri: getallfeedback-service/
      Policies:
        - DynamoDBCrudPolicy:
            TableName: !Ref FeedbackDB
        - AWSXRayDaemonWriteAccess
      Environment:
        Variables:
          FEEDBACK_DB: !Ref FeedbackDB
      Events:
        GetAllFeedbackEvent:
          Type: Api
          Properties:
            Path: /get-all-feedback
            Method: GET
            RestApiId:
              Ref: FeedbackAPI

  GetFeedbackByShareStatusServiceFunction:
    Type: AWS::Serverless::Function
    Properties:
      Description: The lambda function to get submitted feedbacks by share status
      Handler: app.getFeedbackByShareStatusHandler
      CodeUri: getfeedbackbysharestatus-service/
      Policies:
        - DynamoDBCrudPolicy:
            TableName: !Ref FeedbackDB
        - AWSXRayDaemonWriteAccess
      Environment:
        Variables:
          FEEDBACK_DB: !Ref FeedbackDB
      Events:
        GetFeedbackByShareStatusEvent:
          Type: Api
          Properties:
            Path: /get-feedback-by-sharestatus
            Method: GET
            RestApiId:
              Ref: FeedbackAPI

  FeedbackDB:
    Type: AWS::DynamoDB::Table
    Properties:
      TableName: feedback-app-backend
      AttributeDefinitions:
        - AttributeName: feedback_id
          AttributeType: S
        - AttributeName: feedback_date
          AttributeType: S
        - AttributeName: share_feedback
          AttributeType: S
      KeySchema:
        - AttributeName: feedback_id
          KeyType: HASH
        - AttributeName: feedback_date
          KeyType: RANGE
      BillingMode: PAY_PER_REQUEST
      GlobalSecondaryIndexes:
        - IndexName: ShareFeedbackStatusIndex
          KeySchema:
            - AttributeName: share_feedback
              KeyType: HASH
            - AttributeName: feedback_date
              KeyType: RANGE
          Projection:
            ProjectionType: ALL

  WebhookURLSSMParameter:
    Type: AWS::SSM::Parameter
    Properties:
      Name: feedback-app-chime-webhook-url
      Description: "parameter store for webhook urls to send feedback notifications"
      Type: String
      Value: https://hooks.chime.aws/incomingwebhooks/replace_with_your_chime_webhook_url_details

Outputs:
  ServiceApi:
    Description: "API Gateway endpoint URL for Prod stage for service function"
    Value: !Sub "https://${FeedbackAPI}.execute-api.${AWS::Region}.amazonaws.com/Prod/"