feat(task1): restructure directories for turborepo monorepo
- Move backend/ to apps/server/ via git mv - Move frontend/ to apps/admin/ via git mv - Create packages/typescript-config/ with base, nestjs, and react-vite presets
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240
apps/server/src/bills/bills.service.ts
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240
apps/server/src/bills/bills.service.ts
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import { Injectable, NotFoundException } from '@nestjs/common';
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import { InjectRepository } from '@nestjs/typeorm';
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import { Repository, DataSource } from 'typeorm';
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import { Bill } from '../entities/bill.entity';
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import { BillItem } from '../entities/bill-item.entity';
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import { RoomExpense } from '../entities/room-expense.entity';
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import { PersonalExpense } from '../entities/personal-expense.entity';
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import { Occupancy } from '../entities/occupancy.entity';
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import { Room } from '../entities/room.entity';
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import { Deposit } from '../entities/deposit.entity';
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import { GenerateBillsDto, UpdateBillStatusDto } from './dto/bill.dto';
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@Injectable()
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export class BillsService {
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constructor(
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@InjectRepository(Bill) private billRepo: Repository<Bill>,
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@InjectRepository(BillItem) private itemRepo: Repository<BillItem>,
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@InjectRepository(RoomExpense) private roomExpRepo: Repository<RoomExpense>,
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@InjectRepository(PersonalExpense) private personalExpRepo: Repository<PersonalExpense>,
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@InjectRepository(Occupancy) private occRepo: Repository<Occupancy>,
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@InjectRepository(Room) private roomRepo: Repository<Room>,
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@InjectRepository(Deposit) private depositRepo: Repository<Deposit>,
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private dataSource: DataSource,
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) {}
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/**
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* 核心计费引擎：按"人天数"加权分摊
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*/
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async generateBills(dto: GenerateBillsDto) {
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const { periodStart, periodEnd } = dto;
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const pStart = new Date(periodStart);
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const pEnd = new Date(periodEnd);
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// 删除该周期已有的草稿账单
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const existingDrafts = await this.billRepo.find({
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where: { periodStart, periodEnd, status: 'draft' },
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});
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if (existingDrafts.length > 0) {
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const draftIds = existingDrafts.map((b) => b.id);
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await this.itemRepo.createQueryBuilder().delete().where('billId IN (:...ids)', { ids: draftIds }).execute();
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await this.billRepo.createQueryBuilder().delete().where('id IN (:...ids)', { ids: draftIds }).execute();
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}
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// 获取所有有费用的宿舍
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const roomExpenses = await this.roomExpRepo.createQueryBuilder('e')
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.where('e.periodStart = :periodStart AND e.periodEnd = :periodEnd', { periodStart, periodEnd })
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.getMany();
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// 按宿舍分组费用
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const roomExpMap = new Map<number, RoomExpense[]>();
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for (const exp of roomExpenses) {
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if (!roomExpMap.has(exp.roomId)) roomExpMap.set(exp.roomId, []);
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roomExpMap.get(exp.roomId)!.push(exp);
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}
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// 计算每个学生的分摊费用
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const studentBillData = new Map<number, { shared: number; items: any[] }>();
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for (const [roomId, expenses] of roomExpMap) {
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// 获取该宿舍在此周期内的所有入住记录
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const occupancies = await this.occRepo.createQueryBuilder('o')
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.leftJoinAndSelect('o.student', 'student')
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.where('o.roomId = :roomId', { roomId })
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.andWhere('o.billingStartDate <= :periodEnd', { periodEnd })
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.andWhere('(o.billingEndDate IS NULL OR o.billingEndDate >= :periodStart)', { periodStart })
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.getMany();
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if (occupancies.length === 0) continue;
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// 计算每个学生的计费天数
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const studentDays: { studentId: number; days: number }[] = [];
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let totalDays = 0;
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for (const occ of occupancies) {
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const start = new Date(Math.max(new Date(occ.billingStartDate).getTime(), pStart.getTime()));
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const end = occ.billingEndDate
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? new Date(Math.min(new Date(occ.billingEndDate).getTime(), pEnd.getTime()))
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: pEnd;
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const days = Math.max(0, Math.ceil((end.getTime() - start.getTime()) / (1000 * 60 * 60 * 24)) + 1);
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studentDays.push({ studentId: occ.studentId, days });
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totalDays += days;
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}
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if (totalDays === 0) continue;
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// 对每项费用进行分摊
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for (const expense of expenses) {
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for (const sd of studentDays) {
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if (sd.days === 0) continue;
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const amount = Number(((sd.days / totalDays) * Number(expense.amount)).toFixed(2));
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if (!studentBillData.has(sd.studentId)) {
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studentBillData.set(sd.studentId, { shared: 0, items: [] });
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}
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const data = studentBillData.get(sd.studentId)!;
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data.shared += amount;
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data.items.push({
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roomId,
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expenseType: expense.expenseType,
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description: `${expense.expenseType} 分摊`,
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days: sd.days,
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totalRoomDays: totalDays,
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roomTotalAmount: expense.amount,
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studentAmount: amount,
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});
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}
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}
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}
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// 获取个人附加费
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const personalExps = await this.personalExpRepo.createQueryBuilder('pe')
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.where('pe.expenseDate >= :periodStart AND pe.expenseDate <= :periodEnd', { periodStart, periodEnd })
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.getMany();
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const personalMap = new Map<number, number>();
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const personalItems = new Map<number, any[]>();
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for (const pe of personalExps) {
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personalMap.set(pe.studentId, (personalMap.get(pe.studentId) || 0) + Number(pe.amount));
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if (!personalItems.has(pe.studentId)) personalItems.set(pe.studentId, []);
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personalItems.get(pe.studentId)!.push({
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roomId: pe.roomId,
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expenseType: pe.expenseType,
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description: `个人费用: ${pe.description || pe.expenseType}`,
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days: 0,
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totalRoomDays: 0,
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roomTotalAmount: pe.amount,
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studentAmount: pe.amount,
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});
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}
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// 合并所有涉及的学生
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const allStudentIds = new Set([...studentBillData.keys(), ...personalMap.keys()]);
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// 生成账单
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const bills: Bill[] = [];
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for (const studentId of allStudentIds) {
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const shared = studentBillData.get(studentId)?.shared || 0;
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const personal = personalMap.get(studentId) || 0;
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const total = Number((shared + personal).toFixed(2));
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const bill = this.billRepo.create({
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studentId,
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periodStart,
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periodEnd,
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sharedAmount: Number(shared.toFixed(2)),
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personalAmount: personal,
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totalAmount: total,
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status: 'draft',
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});
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const savedBill = await this.billRepo.save(bill);
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// 保存明细
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const items = [
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...(studentBillData.get(studentId)?.items || []),
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...(personalItems.get(studentId) || []),
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];
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for (const item of items) {
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await this.itemRepo.save(this.itemRepo.create({ ...item, billId: savedBill.id }));
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}
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bills.push(savedBill);
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}
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return { message: `成功生成 ${bills.length} 条账单`, count: bills.length, bills };
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}
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async findAll(query?: { periodStart?: string; periodEnd?: string; studentId?: number; status?: string }) {
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const qb = this.billRepo.createQueryBuilder('b')
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.leftJoinAndSelect('b.student', 'student')
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.orderBy('b.generatedAt', 'DESC');
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if (query?.periodStart) qb.andWhere('b.periodStart = :ps', { ps: query.periodStart });
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if (query?.periodEnd) qb.andWhere('b.periodEnd = :pe', { pe: query.periodEnd });
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if (query?.studentId) qb.andWhere('b.studentId = :sid', { sid: query.studentId });
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if (query?.status) qb.andWhere('b.status = :status', { status: query.status });
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const bills = await qb.getMany();
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return this.attachDepositInfo(bills);
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}
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async findOne(id: number) {
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const bill = await this.billRepo.findOne({ where: { id }, relations: ['student', 'items'] });
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if (!bill) throw new NotFoundException('账单不存在');
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const [withDeposit] = await this.attachDepositInfo([bill]);
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return withDeposit;
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}
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/**
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* 给账单挂上"押金联动"信息：
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* - availableDeposit: 当前学生处于已缴未退状态(paid)的押金总额
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* - depositApplied: 本张账单可从押金抵扣的金额（min(押金, 应付总额)）
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* - amountAfterDeposit: 抵扣押金后学生需另外支付的金额
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*/
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private async attachDepositInfo(bills: Bill[]): Promise<any[]> {
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if (!bills || bills.length === 0) return bills;
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const studentIds = Array.from(new Set(bills.map((b) => b.studentId)));
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if (studentIds.length === 0) return bills;
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const deposits = await this.depositRepo.createQueryBuilder('d')
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.where('d.studentId IN (:...ids)', { ids: studentIds })
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.andWhere('d.status = :status', { status: 'paid' })
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.getMany();
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const depMap = new Map<number, number>();
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for (const d of deposits) {
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depMap.set(d.studentId, (depMap.get(d.studentId) || 0) + Number(d.amount || 0));
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}
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return bills.map((b) => {
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const total = Number(b.totalAmount || 0);
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const available = Number((depMap.get(b.studentId) || 0).toFixed(2));
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const applied = Number(Math.min(available, total).toFixed(2));
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const afterDeposit = Number(Math.max(0, total - applied).toFixed(2));
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return Object.assign({}, b, {
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availableDeposit: available,
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depositApplied: applied,
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amountAfterDeposit: afterDeposit,
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});
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});
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}
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async updateStatus(id: number, dto: UpdateBillStatusDto) {
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const bill = await this.billRepo.findOne({ where: { id } });
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if (!bill) throw new NotFoundException('账单不存在');
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bill.status = dto.status;
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return this.billRepo.save(bill);
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}
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async batchUpdateStatus(ids: number[], status: string) {
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await this.billRepo.createQueryBuilder().update().set({ status }).where('id IN (:...ids)', { ids }).execute();
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return { message: `成功更新 ${ids.length} 条账单状态` };
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}
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async remove(id: number) {
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const exists = await this.billRepo.findOne({ where: { id } });
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if (!exists) throw new NotFoundException('账单不存在');
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await this.itemRepo.delete({ billId: id });
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await this.billRepo.delete(id);
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return { message: '账单已删除' };
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}
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async batchRemove(ids: number[]) {
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await this.itemRepo.createQueryBuilder().delete().where('billId IN (:...ids)', { ids }).execute();
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await this.billRepo.createQueryBuilder().delete().where('id IN (:...ids)', { ids }).execute();
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return { message: `成功删除 ${ids.length} 条账单` };
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}
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}
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