class FinanceRecord {
  final int id;
  final String type; // receivable | payable | receipt | payment
  final double amount;
  final double balance;
  final String status; // open | closed
  final String? refType;
  final int? refId;
  final String? partnerName;
  final int? partnerId;
  final String? recordDate;
  final String? remark;

  const FinanceRecord({
    required this.id,
    required this.type,
    required this.amount,
    required this.balance,
    this.status = 'open',
    this.refType,
    this.refId,
    this.partnerName,
    this.partnerId,
    this.recordDate,
    this.remark,
  });

  String get typeLabel {
    switch (type) {
      case 'receivable':
        return '应收账款';
      case 'payable':
        return '应付账款';
      case 'receipt':
        return '收款';
      case 'payment':
        return '付款';
      default:
        return type;
    }
  }

  /// 单据抬头（近期单据列表用）：收付款显示类型，应收/应付回溯到来源单据
  String get docTitle {
    final ref = switch (refType) {
      'stock_in' => '入库单',
      'stock_out' => '出库单',
      _ => null,
    };
    if (ref != null) return ref;
    return typeLabel;
  }

  factory FinanceRecord.fromJson(Map<String, dynamic> json) => FinanceRecord(
        id: (json['id'] as num).toInt(),
        type: json['type'] as String,
        amount: (json['amount'] as num).toDouble(),
        balance: (json['balance'] as num).toDouble(),
        status: json['status'] as String? ?? 'open',
        refType: json['ref_type'] as String?,
        refId: json['ref_id'] != null ? (json['ref_id'] as num).toInt() : null,
        partnerName:
            (json['partner'] as Map<String, dynamic>?)?['name'] as String?,
        partnerId: json['partner_id'] != null
            ? (json['partner_id'] as num).toInt()
            : null,
        recordDate: json['record_date'] as String?,
        remark: json['remark'] as String?,
      );
}

/// GET /finance/summary 行：按往来单位分组的未结清应收/应付聚合
class PartnerFinanceSummary {
  final int? partnerId;
  final String partnerName;
  final String type; // payable | receivable
  final int recordCount;
  final double totalAmount;

  const PartnerFinanceSummary({
    this.partnerId,
    this.partnerName = '',
    required this.type,
    this.recordCount = 0,
    required this.totalAmount,
  });

  factory PartnerFinanceSummary.fromJson(Map<String, dynamic> json) =>
      PartnerFinanceSummary(
        partnerId: json['partner_id'] != null
            ? (json['partner_id'] as num).toInt()
            : null,
        partnerName: json['partner_name'] as String? ?? '',
        type: json['type'] as String,
        recordCount: (json['record_count'] as num?)?.toInt() ?? 0,
        totalAmount: (json['total_amount'] as num?)?.toDouble() ?? 0,
      );
}

/// GET /finance/trend 点：月度收支（in=销售额、out=采购额，单位元）。
class TrendPoint {
  final String month; // "2026-01"
  final double inAmount;
  final double outAmount;

  const TrendPoint(
      {required this.month, required this.inAmount, required this.outAmount});

  factory TrendPoint.fromJson(Map<String, dynamic> json) => TrendPoint(
        month: json['month'] as String? ?? '',
        inAmount: (json['in'] as num?)?.toDouble() ?? 0,
        outAmount: (json['out'] as num?)?.toDouble() ?? 0,
      );
}