AWSTemplateFormatVersion: '2010-09-09'
Description: >
  Create Route53 Hosted Zones for demonstration of canary blue-green deployment.
  Assign the same DNS name to two different LoadBalancers, with different weights.
  The Blue LB will recieve all of the traffic to start, and the Green LB will receive nothing.
  We will alter this later, once the Green service is ready to accept traffic.
  
Parameters:
  ZoneName:
    Type: String
  RecordName:
    Type: String
  BlueName:
    Type: String
  GreenName:
    Type: String
  CanonicalZone:
    Type: String
    
Resources:
  Route53:
    Type: AWS::Route53::HostedZone
    Properties: 
      HostedZoneConfig:
        Comment: 'My hosted zone for canary testing'
      HostedZoneTags:
        - 
          Key: purpose
          Value: blue-greeen-canary
      Name: !Ref ZoneName
      # VPCs: For private hosted zones
      
  DNSRecord:
    Type: AWS::Route53::RecordSetGroup
    DependsOn: Route53
    Properties:
      HostedZoneName: !Ref ZoneName
      Comment: Alias targeted to ECS ALB LoadBalancer
      RecordSets:
      - Name: !Join ['.', [!Ref RecordName, !Ref ZoneName]]
        SetIdentifier: blue
        Weight: 100
        Type: A
        AliasTarget:
          HostedZoneId: !Ref CanonicalZone
          DNSName: !Ref BlueName
          EvaluateTargetHealth: False
      - Name: !Join ['.', [!Ref RecordName, !Ref ZoneName]]
        SetIdentifier: green
        Weight: 0
        Type: A
        AliasTarget:
          HostedZoneId: !Ref CanonicalZone
          DNSName: !Ref GreenName
          EvaluateTargetHealth: False
          
Outputs:
  DNS:
    Value: !Join ['.', [!Ref RecordName, !Ref ZoneName]]
  HostedZoneID: 
    Value: !Ref Route53