class PaymentOperationDTO {
  final String? stepRef;
  final String? operationRef;
  final String? gateway;
  final String? code;
  final String? state;
  final String? label;
  final String? failureCode;
  final String? failureReason;
  final String? startedAt;
  final String? completedAt;

  const PaymentOperationDTO({
    this.stepRef,
    this.operationRef,
    this.gateway,
    this.code,
    this.state,
    this.label,
    this.failureCode,
    this.failureReason,
    this.startedAt,
    this.completedAt,
  });

  factory PaymentOperationDTO.fromJson(Map<String, dynamic> json) =>
      PaymentOperationDTO(
        stepRef: _asString(json['stepRef'] ?? json['step_ref']),
        operationRef: _asString(json['operationRef'] ?? json['operation_ref']),
        gateway: _asString(json['gateway']),
        code: _asString(json['code']),
        state: _asString(json['state']),
        label: _asString(json['label']),
        failureCode: _asString(json['failureCode'] ?? json['failure_code']),
        failureReason: _asString(
          json['failureReason'] ?? json['failure_reason'],
        ),
        startedAt: _asString(json['startedAt'] ?? json['started_at']),
        completedAt: _asString(json['completedAt'] ?? json['completed_at']),
      );

  Map<String, dynamic> toJson() => <String, dynamic>{
    'stepRef': stepRef,
    'operationRef': operationRef,
    'gateway': gateway,
    'code': code,
    'state': state,
    'label': label,
    'failureCode': failureCode,
    'failureReason': failureReason,
    'startedAt': startedAt,
    'completedAt': completedAt,
  };
}

String? _asString(Object? value) {
  final text = value?.toString().trim();
  if (text == null || text.isEmpty) return null;
  return text;
}