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AWSTemplateFormatVersion: 2010-09-09
Description: Service Catalog Elasticache Product
Parameters:
  ClusterName:
    Description: Cluster Name
    Type: String
  NodeType:
    Description: Elasticache Node Type
    Type: String
  NumberClusters:
    Description: Number of Cache Clusters
    Type: Number
    MinValue: 1
    MaxValue: 6
    Default: 2
    ConstraintDescription: Value must be between 1-6
  AuthToken:
    Description: The password that's used to access a password-protected server
    Type: String
    NoEcho: true
    Default: ''
  SNSTopicArn:
    Description: SNS Notification Topic Arn
    Type: String
    Default: ''
  CacheSubnetGroupName:
    Description: Cache Subnet Group Name
    Type: String
  SecurityGroupIds:
    Description: Security Groups Ids
    Type: CommaDelimitedList
  Tags:
    Description: The tags to be applied to the resource.
    Type: String
    Default: ''    

Conditions:
  NoSNS: !Equals [!Ref SNSTopicArn, '']
  NoAuthToken: !Equals [!Ref AuthToken, '']
  IsT2: !Or [!Equals [!Ref NodeType, 'cache.t2.micro'], !Equals [!Ref NodeType, 'cache.t2.small'], !Equals [!Ref NodeType, 'cache.t2.medium']]
  HasTags: !Not [!Equals [!Ref Tags, '']]

Resources:
  GetTags:
    Type: "Custom::ResourceCompliance"
    Condition : HasTags
    Version: "1.0"
    Properties:
      ServiceToken: !Sub 'arn:aws:lambda:${AWS::Region}:${AWS::AccountId}:function:sc-resource-compliance'
      Action:
        Name: json
        Parameters:
          JSON: !Ref Tags
          Type: Tags
  ElastiCache:
    Type: AWS::ElastiCache::ReplicationGroup
    Properties:
      AtRestEncryptionEnabled: True
      TransitEncryptionEnabled: True
      AuthToken: !If [NoAuthToken, !Ref "AWS::NoValue", !Ref AuthToken]
      AutoMinorVersionUpgrade: False
      AutomaticFailoverEnabled: !If [IsT2, False, True]
      CacheNodeType: !Ref NodeType
      CacheParameterGroupName: default.redis4.0
      CacheSubnetGroupName: !Ref CacheSubnetGroupName
      Engine: redis
      EngineVersion: '4.0.10'
      NotificationTopicArn: !If [NoSNS, !Ref "AWS::NoValue", !Ref SNSTopicArn]
      NumCacheClusters: !Ref NumberClusters
      Port: 6379
      ReplicationGroupDescription: 'AMT Redis Cluster'
      ReplicationGroupId: !Ref ClusterName
      SecurityGroupIds: !Ref SecurityGroupIds
      Tags: !If [HasTags, !GetAtt GetTags.Json, !Ref "AWS::NoValue"]

Outputs:
  PrimaryEndPoint:
    Value: !GetAtt ElastiCache.PrimaryEndPoint.Address
    Export:
      Name: !Sub ${AWS::StackName}-PrimaryEndPoint
  ElastiCacheId:
    Value: !Ref ElastiCache
    Export:
      Name: !Sub ${AWS::StackName}-ElastiCacheId