Description: >
  Create ECS Service for Blue/Green Deployment on ECS. For further reference, please review BluegreenRepo ==> https://github.com/awslabs/ecs-blue-green-deployment

Parameters:
  DesiredCount:
    Type: Number
    Default: 0

  VpcId:
    Type: AWS::EC2::VPC::Id

  Cluster:
    Type: String

  LoadBalancer:
    Type: String

  Repository:
    Type: String

  Tag:
    Type: String
    Default: latest

  Port:
    Type: Number

  Identifier:
    Type: String

  IsProduction:
    Type: String


Resources:

  LoadBalancerListener:
    Type: AWS::ElasticLoadBalancingV2::Listener
    Properties:
      LoadBalancerArn: !Ref LoadBalancer
      Port: !Ref Port
      Protocol: HTTP
      DefaultActions:
        - Type: forward
          TargetGroupArn: !Ref TargetGroup

  TargetGroup:
    Type: AWS::ElasticLoadBalancingV2::TargetGroup
    Properties:
      VpcId: !Ref VpcId
      Port: !Ref Port
      Protocol: HTTP
      Matcher:
        HttpCode: 200-299
      HealthCheckIntervalSeconds: 10
      HealthCheckPath: /
      HealthCheckProtocol: HTTP
      HealthCheckTimeoutSeconds: 5
      HealthyThresholdCount: 2
      TargetGroupAttributes:
        - Key: deregistration_delay.timeout_seconds
          Value: 30
      Tags:
        - Key: Identifier
          Value: !Ref Identifier
        - Key: Image
          Value: !Ref Tag
        - Key: IsProduction
          Value: !Ref IsProduction

  ListenerRule:
    Type: AWS::ElasticLoadBalancingV2::ListenerRule
    Properties:
      Actions:
        - Type: forward
          TargetGroupArn: !Ref TargetGroup
      Conditions:
        - Field: path-pattern
          Values:
          - "*"
      ListenerArn: !Ref LoadBalancerListener
      Priority: 1

  ECSServiceRole:
    Type: AWS::IAM::Role
    Properties:
      #RoleName: !Sub ecs-service-${AWS::StackName}
      Path: /
      AssumeRolePolicyDocument: |
        {
            "Statement": [{
                "Effect": "Allow",
                "Principal": { "Service": [ "ecs.amazonaws.com" ]},
                "Action": [ "sts:AssumeRole" ]
            }]
        }
      ManagedPolicyArns:
        - arn:aws:iam::aws:policy/service-role/AmazonEC2ContainerServiceRole

  Service:
    Type: AWS::ECS::Service
    Properties:
      Cluster: !Ref Cluster
      Role: !Ref ECSServiceRole
      DesiredCount: !Ref DesiredCount
      TaskDefinition: !Ref TaskDefinition
      LoadBalancers:
        - ContainerName: simple-app
          ContainerPort: 80
          TargetGroupArn: !Ref TargetGroup

  TaskDefinition:
    Type: AWS::ECS::TaskDefinition
    Properties:
      #Family: !Sub ${AWS::StackName}-simple-app
      ContainerDefinitions:
        - Name: simple-app
          Image: !Sub ${AWS::AccountId}.dkr.ecr.${AWS::Region}.amazonaws.com/${Repository}:${Tag}
          EntryPoint:
            - /usr/sbin/apache2
            - -D
            - FOREGROUND
          Essential: true
          Memory: 128
          MountPoints:
            - SourceVolume: my-vol
              ContainerPath: /var/www/my-vol
          PortMappings:
            - ContainerPort: 80
          Environment:
            - Name: Tag
              Value: !Ref Tag
        - Name: busybox
          Image: busybox
          EntryPoint:
            - sh
            - -c
          Essential: false
          Memory: 128
          VolumesFrom:
            - SourceContainer: simple-app
          Command:
            - /bin/sh -c "while true; do /bin/date > /var/www/my-vol/date; sleep 1; done"
      Volumes:
        - Name: my-vol