main.dart

enum EngagementType { unknown, newsItem, coachingTip, facilitation, surveyEngagement, videoMessage, textMessage, reflection, }

/// this one extension provides all the central policy logic for all EngagementTypes
extension EngagementManagement on EngagementType {
  String get displayName {
    switch (this) {
      case EngagementType.reflection:
        return 'Reflection';
      case EngagementType.textMessage:
        return 'Text Message';
      case EngagementType.videoMessage:
        return 'Video Message';
      case EngagementType.surveyEngagement:
        return 'Survey Engagement';
      case EngagementType.facilitation:
        return 'Facilitation';
      case EngagementType.coachingTip:
        return 'Coaching Tip';
      case EngagementType.newsItem:
        return 'News Item';
      default:
        return 'UNKNOWN';
    }
  }
  
  bool get isAllowedInFacilitation {
    // All types are allowed in a Facilitation other then the unknown one
    if(this == EngagementType.unknown) return false;
    return true;
  }
  
  bool get isAllowedOnHomeScreen {
    // Only some types are allowed on the home screen
    switch (this) {
      case EngagementType.textMessage:
      case EngagementType.videoMessage:
      case EngagementType.surveyEngagement:
        return true;
      default:
        return false;
    }
  }
  
  // we add new methods as we need them....
}

main() {
 
  // to get data from an enum type
  print('My name is ${EngagementType.videoMessage.displayName} and I am allowed in a Facilitation: ${EngagementType.videoMessage.isAllowedInFacilitation}' );
  
  // to iterate through all types and take some action based on the policy
  for (var type in EngagementType.values) {
    print('Is ${type.displayName} allowd on home screen? ${type.isAllowedOnHomeScreen}');
  }
}