Parameter handling in CloudFormation

CFN-ParametersMappingsConditions.yaml

# Reminder of how to do some basic parameter handling in CFN - not syntatically correct (conditions don't match params etc) just a dump of way to handle things

Parameters:
    ProjectName:
      Type: String
      Default: cicd-terraform
      AllowedPattern: [a-zA-Z][a-zA-Z0-9-]*
      MinLength: 3
      MaxLength: 64
      Description: Adhere to S3 naming standard; must begin with a letter and contain only alphanumeric characters or hyphens.
  SnsTopicEmailAddress:
    Type: String
    Default: ''
    AllowedPattern: (^$|^[^@\s]+@[^@\s]+\.[^@\s]+$)
    Description: >-
      'Email address for recipients who wish to recieve notifications when someone approves/rejects an approval gate in any pipeline in the account. 
      (Leave blank if there is no need for notifications)'
  DeployApprovalAudit:
    Type: String
    Default: true
    AllowedValues:
    - true
    - false
Conditions:
  ShouldCreateSchedule:
    !Not
      - !Equals ["None", !Ref TFSchdule]
  ShouldCreateDestroy:
    !Equals [true, !Ref TFDestroyCodePipe]
  SnsEmailAddressExists: 
    !Not
    - !Equals
      - !Ref SnsTopicEmailAddress
      - ''
 Metadata:
  AWS::CloudFormation::Interface:
    ParameterLabels:
      ProjectName:
        default: Project Name
  ParameterGroups:
      -
        Label:
          default: Environment Details
        Parameters:
        - ProjectName
        - Environment