AWSTemplateFormatVersion: 2010-09-09
Description: "Creates an S3 bucket to store logs."

Parameters:
  BucketPrefix:
    Type: String
    Description: The name of the Application or Project using this bucket.
    MinLength: 2
    ConstraintDescription: "use only lower case letters or numbers"
    AllowedPattern: '[a-z0-9\-]+'
  KeepBucket:
    Type: String
    Description: Keep the bucket if the stack is deleted.
    AllowedValues:
      - 'TRUE'
      - 'FALSE'
    Default: 'FALSE'

Conditions:
  RetainBucket: !Equals [ !Ref KeepBucket, "TRUE" ]
  DeleteBucket: !Equals [ !Ref KeepBucket, "FALSE" ]

Resources:
  LogsBucket:
    Condition: DeleteBucket
    Type: AWS::S3::Bucket
    Properties:
      BucketName:
        !Sub ${BucketPrefix}-logs-${AWS::Region}

  RetainLogsBucket:
    Condition: RetainBucket
    Type: AWS::S3::Bucket
    DeletionPolicy: Retain
    Properties:
      BucketName:
        !Sub ${BucketPrefix}-logs-${AWS::Region}

Outputs:
  LogsBucketName:
    Description: Name of the logs bucket.
    Value: !If [RetainBucket, !Ref RetainLogsBucket, !Ref LogsBucket]
    Export:
      Name: !Sub ${BucketPrefix}-LogsBucket