Parameters:
  App:
    Type: String
    Description: Your application's name.
  Env:
    Type: String
    Description: The environment name your service, job, or workflow is being deployed to.
  Name:
    Type: String
    Description: The name of the service, job, or workflow being deployed.
  # Customize your Aurora Serverless cluster by setting the default value of the following parameters.
  webclusterDBName:
    Type: String
    Description: The name of the initial database to be created in the Aurora Serverless v2 cluster.
    Default: oassist_web
    # Cannot have special characters
    # Naming constraints: https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/CHAP_Limits.html#RDS_Limits.Constraints
Mappings:
  webclusterEnvScalingConfigurationMap:
    staging:
      "DBMinCapacity": 0.5 # AllowedValues: from 0.5 through 128
      "DBMaxCapacity": 8 # AllowedValues: from 0.5 through 128

    All:
      "DBMinCapacity": 0.5 # AllowedValues: from 0.5 through 128
      "DBMaxCapacity": 8 # AllowedValues: from 0.5 through 128

Resources:
  webclusterDBSubnetGroup:
    Type: "AWS::RDS::DBSubnetGroup"
    Properties:
      DBSubnetGroupDescription: Group of Copilot private subnets for Aurora Serverless v2 cluster.
      SubnetIds:
        !Split [",", { "Fn::ImportValue": !Sub "${App}-${Env}-PrivateSubnets" }]
  webclusterSecurityGroup:
    Metadata:
      "aws:copilot:description": "A security group for your workload to access the Aurora Serverless v2 cluster webcluster"
    Type: "AWS::EC2::SecurityGroup"
    Properties:
      GroupDescription: !Sub "The Security Group for ${Name} to access Aurora Serverless v2 cluster webcluster."
      VpcId:
        Fn::ImportValue: !Sub "${App}-${Env}-VpcId"
      Tags:
        - Key: Name
          Value: !Sub "copilot-${App}-${Env}-${Name}-Aurora"
  webclusterDBClusterSecurityGroup:
    Metadata:
      "aws:copilot:description": "A security group for your Aurora Serverless v2 cluster webcluster"
    Type: AWS::EC2::SecurityGroup
    Properties:
      GroupDescription: The Security Group for the Aurora Serverless v2 cluster.
      SecurityGroupIngress:
        - ToPort: 5432
          FromPort: 5432
          IpProtocol: tcp
          Description: !Sub "From the Aurora Security Group of the workload ${Name}."
          SourceSecurityGroupId: !Ref webclusterSecurityGroup
      VpcId:
        Fn::ImportValue: !Sub "${App}-${Env}-VpcId"
  webclusterAuroraSecret:
    Metadata:
      "aws:copilot:description": "A Secrets Manager secret to store your DB credentials"
    Type: AWS::SecretsManager::Secret
    Properties:
      Description: !Sub Aurora main user secret for ${AWS::StackName}
      GenerateSecretString:
        SecretStringTemplate: '{"username": "postgres"}'
        GenerateStringKey: "password"
        ExcludePunctuation: true
        IncludeSpace: false
        PasswordLength: 16
  webclusterDBClusterParameterGroup:
    Metadata:
      "aws:copilot:description": "A DB parameter group for engine configuration values"
    Type: "AWS::RDS::DBClusterParameterGroup"
    Properties:
      Description: !Ref "AWS::StackName"
      Family: "aurora-postgresql14"
      Parameters:
        client_encoding: "UTF8"
  webclusterDBCluster:
    Metadata:
      "aws:copilot:description": "The webcluster Aurora Serverless v2 database cluster"
    Type: "AWS::RDS::DBCluster"
    Properties:
      MasterUsername:
        !Join [
          "",
          [
            "{{resolve:secretsmanager:",
            !Ref webclusterAuroraSecret,
            ":SecretString:username}}",
          ],
        ]
      MasterUserPassword:
        !Join [
          "",
          [
            "{{resolve:secretsmanager:",
            !Ref webclusterAuroraSecret,
            ":SecretString:password}}",
          ],
        ]
      DatabaseName: !Ref webclusterDBName
      Engine: "aurora-postgresql"
      EngineVersion: "14.4"
      DBClusterParameterGroupName: !Ref webclusterDBClusterParameterGroup
      DBSubnetGroupName: !Ref webclusterDBSubnetGroup
      Port: 5432
      VpcSecurityGroupIds:
        - !Ref webclusterDBClusterSecurityGroup
      ServerlessV2ScalingConfiguration:
        # Replace "All" below with "!Ref Env" to set different autoscaling limits per environment.
        MinCapacity:
          !FindInMap [webclusterEnvScalingConfigurationMap, All, DBMinCapacity]
        MaxCapacity:
          !FindInMap [webclusterEnvScalingConfigurationMap, All, DBMaxCapacity]
  webclusterDBWriterInstance:
    Metadata:
      "aws:copilot:description": "The webcluster Aurora Serverless v2 writer instance"
    Type: "AWS::RDS::DBInstance"
    Properties:
      DBClusterIdentifier: !Ref webclusterDBCluster
      DBInstanceClass: db.serverless
      Engine: "aurora-postgresql"
      PromotionTier: 1
      AvailabilityZone: !Select
        - 0
        - !GetAZs
          Ref: AWS::Region

  webclusterSecretAuroraClusterAttachment:
    Type: AWS::SecretsManager::SecretTargetAttachment
    Properties:
      SecretId: !Ref webclusterAuroraSecret
      TargetId: !Ref webclusterDBCluster
      TargetType: AWS::RDS::DBCluster
Outputs:
  webclusterSecret: # injected as WEBCLUSTER_SECRET environment variable by Copilot.
    Description: "The JSON secret that holds the database username and password. Fields are 'host', 'port', 'dbname', 'username', 'password', 'dbClusterIdentifier' and 'engine'"
    Value: !Ref webclusterAuroraSecret
  webclusterSecurityGroup:
    Description: "The security group to attach to the workload."
    Value: !Ref webclusterSecurityGroup