Parameters:  
  
  EnvironmentName:
    Type: String
  ServiceName:
    Type: String
  Path:
    Type: String
  Priority:
    Type: Number
  DesiredCount:
    Type: Number
  ContainerName:
    Type: String
  ContainerPort:
    Type: Number
  ContainerCommand:
    Type: CommaDelimitedList
  LogGroupName:
    Type: String
    
  # ECR Repo name
  ECRRepoName:
    Type: String
  ECRImageTag:
    Type: String

# Docker cmd
#  DockerCmd:
#    Type: String

  # Service discovery
  NamespaceId:
    Type: String

Resources:

  CWLogGroup:
    Type: "AWS::Logs::LogGroup"
    Properties:
      LogGroupName: !Ref LogGroupName
      RetentionInDays: 7 # [1, 3, 5, 7, 14, 30, 60, 90, 120, 150, 180, 365, 400, 545, 731, 1827, 3653]
  
  ServiceRegistry:   
    Type: AWS::ServiceDiscovery::Service
    Properties: 
      Description: Front service
      DnsConfig: 
        DnsRecords:
          - TTL: 300
            Type: A
        NamespaceId: !Ref NamespaceId
        RoutingPolicy: WEIGHTED
      HealthCheckCustomConfig: 
        FailureThreshold: 1    
      Name: !Ref ServiceName
      NamespaceId: !Ref NamespaceId

# Service

  Service:
    Type: AWS::ECS::Service
    DependsOn: ListenerRule
    Properties:
      Cluster:
        Fn::ImportValue:
          !Sub ${EnvironmentName}:ClusterName
      DesiredCount: !Ref DesiredCount
      TaskDefinition: !Ref TaskDefinition
      LaunchType: FARGATE
      NetworkConfiguration:
        AwsvpcConfiguration:
          SecurityGroups:
            - Fn::ImportValue: !Sub ${EnvironmentName}:ContainerSecurityGroup
          Subnets:
            - Fn::ImportValue: !Sub ${EnvironmentName}:PrivateSubnetOne
            - Fn::ImportValue: !Sub  ${EnvironmentName}:PrivateSubnetTwo
      LoadBalancers:
        - ContainerName: !Ref ContainerName
          ContainerPort: !Ref ContainerPort
          TargetGroupArn: !Ref TargetGroup
      ServiceRegistries:
        - ContainerName: !Ref ContainerName
          RegistryArn : !GetAtt ServiceRegistry.Arn
      DeploymentConfiguration:
        MaximumPercent: 200
        MinimumHealthyPercent: 50
 

  TaskExecutionRole:
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument:
        Statement:
        - Effect: Allow
          Principal:
            Service: [ecs-tasks.amazonaws.com]
          Action: ['sts:AssumeRole']
      Path: /
      ManagedPolicyArns:
        - arn:aws:iam::aws:policy/service-role/AmazonECSTaskExecutionRolePolicy

  TaskDefinition:
    Type: AWS::ECS::TaskDefinition
    Properties:
      Family: !Sub ${ServiceName}
      NetworkMode: awsvpc
      RequiresCompatibilities: 
        - EC2
        - FARGATE  
      Cpu: 256
      Memory: 512
      ExecutionRoleArn: !Ref TaskExecutionRole
      ContainerDefinitions:
        - Name: !Ref ContainerName
          Image: !Sub ${AWS::AccountId}.dkr.ecr.${AWS::Region}.amazonaws.com/${ECRRepoName}:${ECRImageTag}
          Command: !Ref ContainerCommand
          LogConfiguration:
            LogDriver: awslogs
            Options:
              awslogs-region: !Sub ${AWS::Region}
              awslogs-group: !Ref LogGroupName
              awslogs-stream-prefix: !Sub ${ECRImageTag}
          Essential: true
          PortMappings:
            - ContainerPort: !Ref ContainerPort
          Environment:
            - Name: AWS_Region
              Value: !Sub ${AWS::Region}

  TargetGroup:
      Type: AWS::ElasticLoadBalancingV2::TargetGroup
      Properties:
          VpcId:
            Fn::ImportValue:
              !Sub ${EnvironmentName}:VpcId
          TargetType: ip
          Port: 80
          Protocol: HTTP
          Matcher: 
              HttpCode: 200-299
          HealthCheckIntervalSeconds: 10
          HealthCheckPath: /ping
          HealthCheckProtocol: HTTP
          HealthCheckTimeoutSeconds: 5
          HealthyThresholdCount: 2
          TargetGroupAttributes:
            - Key: deregistration_delay.timeout_seconds
              Value: 5
          
  ListenerRule:
      Type: AWS::ElasticLoadBalancingV2::ListenerRule
      Properties:
          ListenerArn:
            Fn::ImportValue:
              !Sub ${EnvironmentName}:PublicListener
          Priority: !Ref Priority
          Conditions:
              - Field: path-pattern
                Values: 
                  - !Ref Path
          Actions:
              - TargetGroupArn: !Ref TargetGroup
                Type: forward
 

Outputs:
  EcsServiceName:
    Description: ECS Service Name
    Value: !GetAtt Service.Name