getUserFriendlyErrorMessage function

Implementation

String getUserFriendlyErrorMessage(dynamic error) {
  final ErrorCode code = _normalizeToErrorCode(error);
  switch (code) {
    case ErrorCode.UserCancelled:
      return 'Purchase was cancelled by user';
    case ErrorCode.NetworkError:
      return 'Network connection error. Please check your internet connection and try again.';
    case ErrorCode.ItemUnavailable:
    case ErrorCode.SkuNotFound:
      return 'This item is not available for purchase';
    case ErrorCode.AlreadyOwned:
      return 'You already own this item';
    case ErrorCode.DeferredPayment:
      return 'Payment is pending approval';
    case ErrorCode.NotPrepared:
      return 'In-app purchase is not ready. Please try again later.';
    case ErrorCode.ServiceError:
      return 'Store service error. Please try again later.';
    case ErrorCode.TransactionValidationFailed:
      return 'Transaction could not be verified';
    case ErrorCode.ReceiptFailed:
      return 'Receipt processing failed';
    default:
      // Try to surface message from PurchaseError if available
      if (error is PurchaseError && error.message.isNotEmpty) {
        return error.message;
      }
      if (error is Map && error['message'] is String) {
        return error['message'] as String;
      }
      return 'An unexpected error occurred';
  }
}