/// OCR 识别出的单条账单
class OcrResult {
  final double amount; // 负数=支出，正数=收入（与 uniApp 语义一致）
  final String? merchant;
  final String? date;
  final double? confidence;

  const OcrResult({
    required this.amount,
    this.merchant,
    this.date,
    this.confidence,
  });

  bool get isExpense => amount < 0;

  double get absAmount => amount.abs();

  factory OcrResult.fromJson(Map<String, dynamic> json) => OcrResult(
        amount: (json['amount'] as num?)?.toDouble() ?? 0,
        merchant: json['merchant']?.toString(),
        date: json['date']?.toString(),
        confidence: (json['confidence'] as num?)?.toDouble(),
      );
}