286 lines
11 KiB
TypeScript
286 lines
11 KiB
TypeScript
import { BadRequestException, Injectable } from '@nestjs/common';
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import { InjectRepository } from '@nestjs/typeorm';
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import { DataSource, Repository } from 'typeorm';
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import { Bill, BillItem, RoomExpense, PersonalExpense, Occupancy, Room } from '../entities';
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import { WalletsService } from '../wallets/wallets.service';
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import type { GenerateBillsDto } from './dto/bill.dto';
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@Injectable()
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export class BillsGenerationService {
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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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private dataSource: DataSource,
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private walletsService: WalletsService,
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) {}
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async generateBillsOnce(dto: GenerateBillsDto) {
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const { periodStart, periodEnd } = dto.billingMonth
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? this.resolveBillingPeriod(dto.billingMonth)
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: { periodStart: dto.periodStart!, periodEnd: dto.periodEnd! };
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if (!this.isValidDate(periodStart) || !this.isValidDate(periodEnd) || periodEnd < periodStart) {
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throw new BadRequestException('账单周期无效，结束日期不能早于开始日期');
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}
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const pStart = new Date(`${periodStart}T00:00:00Z`);
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const pEnd = new Date(`${periodEnd}T00:00:00Z`);
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const existingBills = await this.billRepo.find({ where: { periodStart, periodEnd } });
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if (existingBills.length > 0) {
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throw new BadRequestException(
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`${dto.billingMonth || `${periodStart}~${periodEnd}`} 账单已生成，不能重复生成`,
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);
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}
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const roomExpenses = await this.roomExpRepo
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.createQueryBuilder('e')
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.where('e.periodStart >= :periodStart AND e.periodEnd <= :periodEnd', {
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periodStart,
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periodEnd,
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})
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.andWhere('e.status = :status', { status: 'active' })
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.getMany();
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const longTermOccupancies: Occupancy[] = [];
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const roomExpMap = new Map<number, RoomExpense[]>();
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for (const expense of roomExpenses) {
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const expenses = roomExpMap.get(expense.roomId) || [];
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expenses.push(expense);
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roomExpMap.set(expense.roomId, expenses);
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}
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const roomIds = new Set([
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...roomExpMap.keys(),
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...longTermOccupancies
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.filter((occupancy) => occupancy.stayType === 'long')
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.map((occupancy) => occupancy.roomId),
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]);
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const studentBillData = new Map<
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number,
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{ shared: number; items: Array<Record<string, unknown>> }
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>();
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for (const roomId of roomIds) {
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const expenses = roomExpMap.get(roomId) || [];
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const occupancies = await this.occRepo
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.createQueryBuilder('o')
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.leftJoinAndSelect('o.student', 'student')
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.leftJoinAndSelect('o.room', 'room')
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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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const shortTermOccs = occupancies.filter((occupancy) => occupancy.stayType !== 'long');
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const longTermOccs = occupancies.filter((occupancy) => occupancy.stayType === 'long');
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for (const occupancy of longTermOccs) {
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const rent = this.calculateLongTermRent(
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occupancy,
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periodStart,
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periodEnd,
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Number(occupancy.room?.monthlyRate || 0),
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);
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if (rent <= 0) continue;
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const data = studentBillData.get(occupancy.studentId) || { shared: 0, items: [] };
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data.shared += rent;
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data.items.push({
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roomId,
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expenseType: 'rent',
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description: `长租月租费 (${occupancy.room?.roomNumber || '未知房间'})`,
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days: 0,
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totalRoomDays: 0,
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roomTotalAmount: rent,
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studentAmount: rent,
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});
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studentBillData.set(occupancy.studentId, data);
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}
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const studentDays = shortTermOccs.map((occupancy) => {
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const start = new Date(
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Math.max(new Date(occupancy.billingStartDate).getTime(), pStart.getTime()),
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);
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const end = occupancy.billingEndDate
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? new Date(Math.min(new Date(occupancy.billingEndDate).getTime(), pEnd.getTime()))
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: pEnd;
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const days = Math.max(0, Math.ceil((end.getTime() - start.getTime()) / 86_400_000) + 1);
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return { studentId: occupancy.studentId, days };
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});
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const totalDays = studentDays.reduce((sum, entry) => sum + entry.days, 0);
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if (totalDays === 0) continue;
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for (const expense of expenses) {
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const eligibleDays = studentDays.filter((entry) => entry.days > 0);
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const expenseTotal = Number(Number(expense.amount).toFixed(2));
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let allocated = 0;
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for (const [index, entry] of eligibleDays.entries()) {
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const amount =
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index === eligibleDays.length - 1
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? Number((expenseTotal - allocated).toFixed(2))
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: Number(((entry.days / totalDays) * expenseTotal).toFixed(2));
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allocated = Number((allocated + amount).toFixed(2));
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const data = studentBillData.get(entry.studentId) || { shared: 0, items: [] };
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data.shared += amount;
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data.items.push({
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roomExpenseId: expense.id,
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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: entry.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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studentBillData.set(entry.studentId, data);
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}
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}
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}
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const personalExps = await this.personalExpRepo
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.createQueryBuilder('pe')
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.where('pe.expenseDate >= :periodStart AND pe.expenseDate <= :periodEnd', {
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periodStart,
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periodEnd,
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})
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.andWhere('pe.status = :status', { status: 'active' })
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.andWhere('pe.billId IS NULL')
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.getMany();
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const personalMap = new Map<number, number>();
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const personalItems = new Map<number, Array<Record<string, unknown>>>();
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for (const expense of personalExps) {
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personalMap.set(
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expense.studentId,
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(personalMap.get(expense.studentId) || 0) + Number(expense.amount),
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);
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const items = personalItems.get(expense.studentId) || [];
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items.push({
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personalExpenseId: expense.id,
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roomId: expense.roomId,
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expenseType: expense.expenseType,
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description: `个人费用: ${expense.description || expense.expenseType}`,
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days: 0,
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totalRoomDays: 0,
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roomTotalAmount: expense.amount,
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studentAmount: expense.amount,
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});
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personalItems.set(expense.studentId, items);
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}
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const allStudentIds = new Set([...studentBillData.keys(), ...personalMap.keys()]);
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const bills = await this.dataSource.transaction(async (manager) => {
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const generated: 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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let bill = await manager.save(
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manager.create(Bill, {
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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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source: 'batch',
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paidAmount: 0,
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outstandingAmount: total,
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status: 'unpaid',
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}),
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);
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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 manager.save(manager.create(BillItem, { ...item, billId: bill.id }));
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const includedPersonal = personalExps.filter((expense) => expense.studentId === studentId);
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if (includedPersonal.length) {
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await manager
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.createQueryBuilder()
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.update(PersonalExpense)
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.set({ billId: bill.id })
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.where('id IN (:...ids)', { ids: includedPersonal.map((expense) => expense.id) })
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.execute();
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}
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bill = await this.walletsService.debitBill(manager, bill);
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generated.push(bill);
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}
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return generated;
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});
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return {
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message: `成功生成 ${bills.length} 条账单`,
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count: bills.length,
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bills,
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periodStart,
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periodEnd,
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};
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}
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private calculateLongTermRent(
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occupancy: Occupancy,
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periodStart: string,
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periodEnd: string,
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monthlyRate: number,
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) {
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const activeStart =
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occupancy.billingStartDate > periodStart ? occupancy.billingStartDate : periodStart;
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const activeEnd =
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occupancy.billingEndDate && occupancy.billingEndDate < periodEnd
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? occupancy.billingEndDate
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: periodEnd;
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if (activeEnd < activeStart || monthlyRate <= 0) return 0;
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const [startYear, startMonth] = activeStart.split('-').map(Number);
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const [endYear, endMonth] = activeEnd.split('-').map(Number);
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let total = 0;
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for (
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let year = startYear, month = startMonth;
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year < endYear || (year === endYear && month <= endMonth);
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) {
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const daysInMonth = new Date(Date.UTC(year, month, 0)).getUTCDate();
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const prefix = `${year}-${String(month).padStart(2, '0')}-`;
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const overlapStart = activeStart > `${prefix}01` ? activeStart : `${prefix}01`;
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const monthEnd = `${prefix}${String(daysInMonth).padStart(2, '0')}`;
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const overlapEnd = activeEnd < monthEnd ? activeEnd : monthEnd;
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const days =
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Math.floor(
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(Date.parse(`${overlapEnd}T00:00:00Z`) - Date.parse(`${overlapStart}T00:00:00Z`)) /
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86_400_000,
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) + 1;
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total += (monthlyRate * days) / daysInMonth;
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if (++month > 12) {
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month = 1;
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year++;
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}
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}
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return Number(total.toFixed(2));
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}
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private isValidDate(value: string) {
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if (!/^\d{4}-\d{2}-\d{2}$/.test(value || '')) return false;
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const date = new Date(`${value}T00:00:00Z`);
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return !Number.isNaN(date.getTime()) && date.toISOString().slice(0, 10) === value;
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}
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private resolveBillingPeriod(billingMonth: string) {
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const matched = /^(\d{4})-(\d{2})$/.exec(billingMonth || '');
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if (!matched) throw new BadRequestException('账单月份格式错误，请使用 YYYY-MM');
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const year = Number(matched[1]);
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const month = Number(matched[2]);
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if (month < 1 || month > 12) throw new BadRequestException('账单月份格式错误，请使用 YYYY-MM');
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const targetMonthStart = new Date(year, month - 1, 1);
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const currentMonthStart = new Date();
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currentMonthStart.setDate(1);
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currentMonthStart.setHours(0, 0, 0, 0);
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if (targetMonthStart >= currentMonthStart)
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throw new BadRequestException('只能生成已结束月份的账单');
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const targetMonthEnd = new Date(year, month, 0);
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const pad = (value: number) => String(value).padStart(2, '0');
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return {
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periodStart: `${year}-${pad(month)}-01`,
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periodEnd: `${year}-${pad(month)}-${pad(targetMonthEnd.getDate())}`,
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};
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}
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}
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