AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Parameters:
  ConnectInstanceArn:
    Type: String
    Default: "AMAZON_CONNECT_INSTANCE_ARN"
  SAMAlias:
    Type: String
    Default: "PROD"
     
Globals:
  Function:
    Timeout: 3
    AutoPublishAlias: !Ref SAMAlias
    DeploymentPreference:
      Type: Linear10PercentEvery1Minute
      Alarms:
        - !Ref AliasErrorMetricGreaterThanZeroAlarm

Resources:
  ConnectLambdaFunction:
    Type: AWS::Serverless::Function 
    Properties:
      Handler: index.handler
      Runtime: nodejs12.x
      InlineCode: |
        "use strict";

        exports.handler = (event, context, callback) => {
            callback(null,{"version": context.functionVersion });
        };
        
  AliasErrorMetricGreaterThanZeroAlarm:
    Type: AWS::CloudWatch::Alarm
    DependsOn: ConnectLambdaFunction
    Properties:
      ComparisonOperator: GreaterThanOrEqualToThreshold
      Dimensions:
        - Name: FunctionName
          Value: !Ref ConnectLambdaFunction
      EvaluationPeriods: 1
      MetricName: Errors
      Namespace: AWS/Lambda
      Period: '60'
      Statistic: Sum
      Threshold: '5'

  ConnectLambdaFunctionPermission:
    Type: AWS::Lambda::Permission
    DependsOn: ConnectLambdaFunction
    Properties:
      FunctionName: !Ref ConnectLambdaFunction.Alias
      Action: 'lambda:InvokeFunction'
      Principal: 'connect.amazonaws.com'
      SourceAccount: !Ref 'AWS::AccountId'
      SourceArn: !Ref ConnectInstanceArn
      
Outputs:
  ConnectLambdaFunctionAlias:
    Description: "Connect Lambda Function Alias"
    Value: !Ref ConnectLambdaFunction.Alias