AWSTemplateFormatVersion: "2010-09-09"
Transform: "AWS::Serverless-2016-10-31"
Description: Amazon IVS Simple Chat Backend

Globals:
  Api:
    Cors:
      AllowMethods: "'GET,POST,OPTIONS'"
      AllowHeaders: "'*'"
      AllowOrigin: "'*'"
  Function:
    Runtime: nodejs18.x
    Timeout: 30
    MemorySize: 128

Resources:
  IvsChatLambdaRefLayer:
    Type: AWS::Serverless::LayerVersion
    Properties:
      LayerName: sam-app-dependencies
      Description: Dependencies for sam app [ivs-simple-chat-backend]
      ContentUri: dependencies/
      CompatibleRuntimes:
        - nodejs18.x
      LicenseInfo: "MIT"
      RetentionPolicy: Retain
  # This is a Lambda function config associated with the source code: chat-auth.js
  chatAuthFunction:
    Type: AWS::Serverless::Function
    Properties:
      Handler: src/chat-auth.chatAuthHandler
      Description: A function that generates an IVS chat authentication token based on the request parameters.
      Layers:
        - !Ref IvsChatLambdaRefLayer
      Policies:
        - Statement:
            Effect: Allow
            Action:
              - ivschat:*
            Resource: "*"
      Events:
        Api:
          Type: Api
          Properties:
            Path: /auth
            Method: POST

  # This is a Lambda function config associated with the source code: chat-event.js
  chatEventFunction:
    Type: AWS::Serverless::Function
    Properties:
      Handler: src/chat-event.chatEventHandler
      Description: A function that sends an event to a specified IVS chat room
      Layers:
        - !Ref IvsChatLambdaRefLayer
      Policies:
        - Statement:
            Effect: Allow
            Action:
              - ivschat:*
            Resource: "*"
      Events:
        Api:
          Type: Api
          Properties:
            Path: /event
            Method: POST

  # This is a Lambda function config associated with the source code: chat-event.js
  chatListFunction:
    Type: AWS::Serverless::Function
    Properties:
      Handler: src/chat-list.chatListHandler
      Description: A function that returns a list of available chat rooms
      Layers:
        - !Ref IvsChatLambdaRefLayer
      Policies:
        - Statement:
            Effect: Allow
            Action:
              - ivschat:*
            Resource: "*"
      Events:
        Api:
          Type: Api
          Properties:
            Path: /list
            Method: GET

Outputs:
  ApiURL:
    Description: "API endpoint URL for Prod environment"
    Value: !Sub "https://${ServerlessRestApi}.execute-api.${AWS::Region}.amazonaws.com/Prod/"