# Copyright 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
# SPDX-License-Identifier: MIT-0

AWSTemplateFormatVersion: 2010-09-09
Description: >
  This template deploys The EcsFargate service.
Metadata:
  version: 1.0.0
Parameters:
  pApp:
    Description: Name of the Application to which the resource belongs
    Type: String
  pClusterName:
    Description: The short name or full Amazon Resource Name (ARN) of the cluster on which to run your service. .
    Type: String
  pDesiredCount:
    Description: Provide the desired number of task definition instances to run in cluster
    Type: Number
  pEcsFargateTargetGroupArn:
    Description: The short name or full Amazon Resource Name (ARN) of the Target Group
    Type: String
  pFargateServiceSecurityGroup:
    Description: Security group for Fargate Service from security-groups.yaml
    Type: String
  pPrivateSubnetIdentifiera:
    Type: 'AWS::EC2::Subnet::Id'
    Description: ID of the subnet where ECS resources will be created.
  pPrivateSubnetIdentifierb:
    Type: 'AWS::EC2::Subnet::Id'
    Description: ID of the subnet where ECS resources will be created.
  pTaskDefinitionArn:
    Description: The short name or full Amazon Resource Name (ARN) of the Task Definition
    Type: String

Resources:
  rEcsFargateService:
    Type: AWS::ECS::Service
    Properties:
      Cluster: !Ref pClusterName
      DesiredCount: !Ref pDesiredCount
      DeploymentController:
        Type: CODE_DEPLOY
      TaskDefinition: !GetAtt rECSTaskDefinitionResource.TaskDefinition
      LaunchType: FARGATE
      HealthCheckGracePeriodSeconds: 60 #The grace time allowed for task to start before health check gives an error
      NetworkConfiguration:
        AwsvpcConfiguration:
          AssignPublicIp: DISABLED
          SecurityGroups:
            - !Ref pFargateServiceSecurityGroup
          Subnets:
            - !Ref pPrivateSubnetIdentifiera
            - !Ref pPrivateSubnetIdentifierb
      LoadBalancers:
        - ContainerName: !Sub '${pApp}'
          ContainerPort: 8080
          TargetGroupArn:
            !Ref pEcsFargateTargetGroupArn
      ServiceName: !Sub '${pApp}-fargateservice'
      SchedulingStrategy: REPLICA

  rECSTaskDefinitionFunctionRole:
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument:
        Version: '2012-10-17'
        Statement:
          - Action: sts:AssumeRole
            Effect: Allow
            Principal:
              Service: lambda.amazonaws.com
      ManagedPolicyArns:
        - arn:aws:iam::aws:policy/service-role/AWSLambdaBasicExecutionRole

  rECSTaskDefinitionFunction:
    Type: AWS::Lambda::Function
    Properties:
      Code: ./../../code-deploy/custom-resource/taskdef
      Description: Function to return initial task definition for the ECS Service
      Handler: TaskDefinitionLambda.lambda_handler
      MemorySize: 128
      Role: !GetAtt rECSTaskDefinitionFunctionRole.Arn
      Runtime: python3.7
      Timeout: 30

  rECSTaskDefinitionResource:
    Type: Custom::ECSTaskDefinitionResource
    Properties:
      ServiceToken: !GetAtt rECSTaskDefinitionFunction.Arn
      TaskDefinition: !Ref pTaskDefinitionArn
      
Outputs:
  oEcsFargateServiceArn:
    Description: rEcsFargateService Arn
    Value: !Ref rEcsFargateService
  oEcsFargateServiceName:
    Description: rEcsFargateService Name
    Value: !GetAtt rEcsFargateService.Name