46 lines
1.2 KiB
Dart
46 lines
1.2 KiB
Dart
import '../models/bill.dart';
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/// 按日期分组的账单
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class BillDayGroup {
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final String date; // yyyy-MM-dd
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final List<Bill> bills;
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final double expenseTotal; // type==1 的合计
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final double incomeTotal; // type==2 的合计
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const BillDayGroup({
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required this.date,
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required this.bills,
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required this.expenseTotal,
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required this.incomeTotal,
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});
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}
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/// 按 billDate 分组，并分别累计当日支出/收入。
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///
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/// 后端已按 `billDate DESC, createTime DESC` 排序，Dart 的 Map 保持插入顺序，
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/// 因此直接顺序遍历累积即可，不要再次排序（否则会打乱同日内的时间顺序）。
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List<BillDayGroup> groupBillsByDate(List<Bill> bills) {
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final grouped = <String, List<Bill>>{};
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for (final bill in bills) {
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grouped.putIfAbsent(bill.billDate, () => []).add(bill);
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}
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return grouped.entries.map((entry) {
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var expense = 0.0;
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var income = 0.0;
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for (final bill in entry.value) {
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if (bill.isExpense) {
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expense += bill.absAmount;
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} else {
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income += bill.absAmount;
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}
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}
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return BillDayGroup(
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date: entry.key,
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bills: entry.value,
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expenseTotal: expense,
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incomeTotal: income,
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);
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}).toList();
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}
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