#
# This template demonstrates how to configure Amazon Route53 Failover record sets that use 
# Amazon Route53 Application Recovery Controller (ARC) healthchecks
#
# For a full description of how it works, please read
# https://aws.amazon.com/fr/blogs/aws/amazon-route-53-application-recovery-controller/
#
AWSTemplateFormatVersion: '2010-09-09'
Description: 'This template creates Amazon Route53 DNS Failover Records with healthcheck for the Tic Tac Toe demo app'
Parameters:
  VpcIdEast:
    Description: The VPC in region us-east-1
    Type: String 
  VpcIdWest:
    Description: The VPC in region us-west-2
    Type: String 
  VpcIdClient:
    Description: The VPC in region us-east-2
    Type: String 
  LoadBalancerDNSNameEast:
    Description: The load balancer DNS name in region us-east-1
    Type: String 

  LoadBalancerDNSNameWest:
    Description: The load balancer DNS name in region us-west-2
    Type: String 

  LoadBalancerHostedZoneEast:
    Description: The load balancer hosted zone id in us-east-1
    Type: String

  LoadBalancerHostedZoneWest:
    Description: The load balancer hosted zone id in us-west-2
    Type: String

  DNSDomainName:
    Description: The DNS domain name for that hosted zone ID 
    Type: String 

  DNSHealthcheckIdEast:
    Description: The DNS domain name for that hosted zone ID 
    Type: String 

  DNSHealthcheckIdWest:
    Description: The DNS domain name for that hosted zone ID 
    Type: String 

  ProjectId:
    AllowedPattern: '[a-zA-Z][a-zA-Z0-9]*'
    ConstraintDescription: Must begin with a letter and contain only alphanumeric
      characters.
    Default: TicTacToe
    Description: The name of the project
    MaxLength: '64'
    MinLength: '1'
    Type: String

Resources:
  PrivateZone: 
    Type: "AWS::Route53::HostedZone"
    Properties: 
      Name: !Ref DNSDomainName
      VPCs: 
        - 
          VPCId: !Ref VpcIdWest
          VPCRegion: 'us-west-2'
        - 
          VPCId: !Ref VpcIdEast
          VPCRegion: 'us-east-1'
        - 
          VPCId: !Ref VpcIdClient
          VPCRegion: 'us-east-2'

#
# The PRIMARY and SECONDARY failover DNS records.
# These are A records as Aliases to the Load Balancer DNS name.
#
  FrontEndAliasRecordPrimary:
      Type: AWS::Route53::RecordSet
      Properties:
        Comment: Failover Recordset to route traffic to the load balancer
        HostedZoneId: !Ref PrivateZone
        Name: !Sub ${ProjectId}.${DNSDomainName}.
        Type: A
        AliasTarget:
          DNSName: !Sub ${LoadBalancerDNSNameEast}
          EvaluateTargetHealth: true
          HostedZoneId: !Sub ${LoadBalancerHostedZoneEast}
        SetIdentifier: !Sub ${ProjectId}-east 
        Failover: PRIMARY 
        HealthCheckId: !Sub ${DNSHealthcheckIdEast}

  FrontEndAliasRecordSecondary:
      Type: AWS::Route53::RecordSet
      Properties:
        Comment: Failover Recordset to route traffic to the load balancer
        HostedZoneId: !Ref PrivateZone
        Name: !Sub ${ProjectId}.${DNSDomainName}.
        Type: A
        AliasTarget:
          DNSName: !Sub ${LoadBalancerDNSNameWest}
          EvaluateTargetHealth: true
          HostedZoneId: !Sub ${LoadBalancerHostedZoneWest}
        SetIdentifier: !Sub ${ProjectId}-west
        Failover: SECONDARY 
        HealthCheckId: !Sub ${DNSHealthcheckIdWest}

Outputs:
  DNSRecordName:
    Value: !Ref FrontEndAliasRecordSecondary