---
AWSTemplateFormatVersion: 2010-09-09

Description: Reference Architecture to host Drupal on AWS - Creates RDS Aurora database cluster

Metadata:
  AWS::CloudFormation::Interface:
    ParameterGroups:
    - Label:
        default: Database Parameters
      Parameters:
        - DatabaseInstanceType
        - DatabaseMasterUsername
        - DatabaseMasterPassword
        - DatabaseName
        - DatabaseSecurityGroup
        - DataSubnet0
        - DataSubnet1
        - DataSubnet2
    ParameterLabels:
      DatabaseInstanceType:
        default: DB Instance Class
      DatabaseMasterUsername:
        default: DB Master Username
      DatabaseMasterPassword:
        default: DB Master Password
      DatabaseName:
        default: DB Name
      DatabaseSecurityGroup:
        default: DB Security Group
      DataSubnet0:
        default: Data Subnet for AZ 0
      DataSubnet1:
        default: Data Subnet for AZ 1
      DataSubnet2:
        default: Data Subnet for AZ 2

Parameters:

  DatabaseInstanceType:
    AllowedValues:
      - db.t2.small
      - db.t2.medium
      - db.r3.large
      - db.r3.xlarge
      - db.r3.2xlarge
      - db.r3.4xlarge
      - db.r3.8xlarge    
    ConstraintDescription: Must be a valid RDS instance class.
    Default: db.t2.medium
    Description: The Amazon RDS database instance class.
    Type: String
  DatabaseMasterUsername:
    AllowedPattern: ^([a-zA-Z0-9]*)$
    Description: The Amazon RDS master username.
    ConstraintDescription: Must contain only alphanumeric characters and be at least 8 characters.
    MaxLength: 16
    MinLength: 1
    Type: String
  DatabaseMasterPassword:
    AllowedPattern: ^([a-z0-9A-Z`~!#$%^&*()_+,\\-])*$
    ConstraintDescription: Must be letters (upper or lower), numbers, and these special characters '_'`~!#$%^&*()_+,-    
    Description: The Amazon RDS master password.
    MaxLength: 41
    MinLength: 8
    NoEcho: true
    Type: String
  DatabaseName:
    AllowedPattern: ^([a-zA-Z0-9]*)$
    Description: The Amazon RDS master database name.
    Type: String
  DatabaseSecurityGroup:
    Description: Select the database security group.
    Type: AWS::EC2::SecurityGroup::Id
  DataSubnet0:
    Description: Select an existing database subnet for AZ 0.
    Type: AWS::EC2::Subnet::Id
  DataSubnet1:
    Description: Select an existing database subnet for AZ 1.
    Type: AWS::EC2::Subnet::Id
  DataSubnet2:
    Description: Select an existing database subnet for AZ 2.
    Type: AWS::EC2::Subnet::Id

Conditions:

  MoreThan2AZ:
    !Or [
      !Equals [ !Ref 'AWS::Region', us-east-1 ],
      !Equals [ !Ref 'AWS::Region', us-east-2 ],
      !Equals [ !Ref 'AWS::Region', us-west-2 ],
      !Equals [ !Ref 'AWS::Region', eu-west-1 ],
      !Equals [ !Ref 'AWS::Region', sa-east-1 ],
      !Equals [ !Ref 'AWS::Region', ap-northeast-1 ],
      !Equals [ !Ref 'AWS::Region', ap-southeast-2 ]
    ]

Resources:

  DatabaseCluster:
    Type: AWS::RDS::DBCluster
    Properties:
      BackupRetentionPeriod: 30
      DatabaseName: !Ref DatabaseName
      DBSubnetGroupName: !Ref DataSubnetGroup
      Engine: aurora
      MasterUsername: !Ref DatabaseMasterUsername
      MasterUserPassword: !Ref DatabaseMasterPassword
      Port: 3306
      Tags:
        - Key: Name
          Value: !Join [ '', [ 'Drupal / ', !Ref 'AWS::StackName' ] ]
      VpcSecurityGroupIds:
      - !Ref DatabaseSecurityGroup
  DatabaseInstance0:
    Type: AWS::RDS::DBInstance
    DeletionPolicy: Delete
    Properties:
      AllowMajorVersionUpgrade: false
      AutoMinorVersionUpgrade: true
      DBClusterIdentifier: !Ref DatabaseCluster
      DBInstanceClass: !Ref DatabaseInstanceType
      DBSubnetGroupName: !Ref DataSubnetGroup
      Engine: aurora
      Tags:
        - Key: Name
          Value: !Join [ '', [ 'Drupal / ', !Ref 'AWS::StackName' ] ]
  DatabaseInstance1:
    Type: AWS::RDS::DBInstance
    DeletionPolicy: Delete
    Properties:
      AllowMajorVersionUpgrade: false
      AutoMinorVersionUpgrade: true
      DBClusterIdentifier: !Ref DatabaseCluster
      DBInstanceClass: !Ref DatabaseInstanceType
      DBSubnetGroupName: !Ref DataSubnetGroup
      Engine: aurora
      Tags:
        - Key: Name
          Value: !Join [ '', [ 'Drupal / ', !Ref 'AWS::StackName' ] ]
  DataSubnetGroup:
    Type: AWS::RDS::DBSubnetGroup
    Properties:
      DBSubnetGroupDescription: RDS Database Subnet Group for Drupal
      SubnetIds:
        !If [
          MoreThan2AZ,
          [ !Ref DataSubnet0, !Ref DataSubnet1, !Ref DataSubnet2 ],
          [ !Ref DataSubnet0, !Ref DataSubnet1 ]
        ]
      Tags:
        - Key: Name
          Value: !Join [ '', [ 'Drupal / ', !Ref 'AWS::StackName' ] ]

Outputs:
  DatabaseCluster:
    Value: !Ref DatabaseCluster
  DatabaseName:
    Value: !Ref DatabaseName
  DatabaseInstance0:
    Value: !Ref DatabaseInstance0
  DatabaseInstance1:
    Value: !Ref DatabaseInstance1
  DataSubnetGroup:
    Value: !Ref DataSubnetGroup
  DatabaseClusterEndpointAddress:
    Value: !GetAtt DatabaseCluster.Endpoint.Address