Parameters:
  EnvironmentName:
    Type: String

  PubELBSubnets:
    Type: CommaDelimitedList
  VpcId:
    Type: String
  ElbSecurityGroup:
    Type: String

Outputs:
  LoadBalancer:
    Description: Your ALB DNS URL
    Value: !Join ['', ["http://",!GetAtt [LoadBalancer, DNSName]]]
  ALBListener:
    Description: ALB Port 80 http Listener
    Value: !Ref LoadBalancerListener

Resources:

### ALB (ELB v2)
  LoadBalancer:
    Type: AWS::ElasticLoadBalancingV2::LoadBalancer
    Properties:
      Name: !Sub ${EnvironmentName}-ALB
      Scheme: internet-facing
      Subnets: !Ref PubELBSubnets
      SecurityGroups:
        - !Ref ElbSecurityGroup

  LoadBalancerListener:
    Type: AWS::ElasticLoadBalancingV2::Listener
    Properties:
      LoadBalancerArn: !Ref LoadBalancer
      Port: 80
      Protocol: HTTP
      DefaultActions:
      - Type: forward
        TargetGroupArn: !Ref DefaultTargetGroup

  # We define a default target group here, as this is a mandatory Parameters
  # when creating an Application Load Balancer Listener. This is not used, instead
  # a target group is created per-service.
  DefaultTargetGroup:
    Type: AWS::ElasticLoadBalancingV2::TargetGroup
    Properties:
      Name: !Sub ${EnvironmentName}-Def-TG
      VpcId: !Ref VpcId
      Port: 80
      Protocol: HTTP
      Matcher:
        HttpCode: 200-299
      HealthCheckIntervalSeconds: 10
      HealthCheckPath: /
      HealthCheckProtocol: HTTP
      HealthCheckTimeoutSeconds: 5
      HealthyThresholdCount: 2
      TargetGroupAttributes:
        - Key: deregistration_delay.timeout_seconds
          Value: 30