279 lines
10 KiB
TypeScript
279 lines
10 KiB
TypeScript
import { Injectable } from '@nestjs/common';
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import { InjectRepository } from '@nestjs/typeorm';
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import { Repository } 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 { Deposit } from '../entities/deposit.entity';
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import * as ExcelJS from 'exceljs';
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import PDFDocument from 'pdfkit';
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import { Response } from 'express';
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@Injectable()
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export class BillsExportService {
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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(Deposit) private depositRepo: Repository<Deposit>,
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) {}
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/**
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* 导出账单列表为 Excel
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*/
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async exportExcel(
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query: { periodStart?: string; periodEnd?: string; studentId?: number; status?: string },
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res: Response,
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) {
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const qb = this.billRepo
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.createQueryBuilder('b')
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.leftJoinAndSelect('b.student', 'student')
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.leftJoinAndSelect('b.items', 'items')
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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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// 查询涉及学生当前押金余额。账单生成时不冻结押金，导出只展示实时余额和已实际扣款。
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const studentIds = Array.from(new Set(bills.map((b) => b.studentId)));
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const depMap = new Map<number, number>();
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if (studentIds.length > 0) {
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const deposits = await this.depositRepo
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.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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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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}
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const workbook = new ExcelJS.Workbook();
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workbook.creator = '恭学教育基地管理系统';
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// Sheet 1: 账单汇总
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const ws = workbook.addWorksheet('账单汇总');
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ws.columns = [
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{ header: '账单ID', key: 'id', width: 10 },
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{ header: '学生姓名', key: 'studentName', width: 14 },
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{ header: '计费周期', key: 'period', width: 24 },
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{ header: '分摊费用', key: 'shared', width: 12 },
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{ header: '个人费用', key: 'personal', width: 12 },
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{ header: '总金额', key: 'total', width: 12 },
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{ header: '可用押金', key: 'deposit', width: 12 },
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{ header: '已扣押金', key: 'depositDeducted', width: 12 },
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{ header: '状态', key: 'status', width: 10 },
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{ header: '生成时间', key: 'generatedAt', width: 20 },
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];
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// 表头样式
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ws.getRow(1).font = { bold: true };
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ws.getRow(1).fill = { type: 'pattern', pattern: 'solid', fgColor: { argb: 'FFE0E0E0' } };
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const statusMap: Record<string, string> = {
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draft: '草稿',
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paid: '已结清',
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};
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for (const bill of bills) {
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const total = Number(bill.totalAmount || 0);
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const dep = Number((depMap.get(bill.studentId) || 0).toFixed(2));
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ws.addRow({
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id: bill.id,
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studentName: (bill as any).student?.name || '-',
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period: `${bill.periodStart} ~ ${bill.periodEnd}`,
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shared: Number(bill.sharedAmount),
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personal: Number(bill.personalAmount),
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total,
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deposit: dep,
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depositDeducted: Number(bill.depositDeductedAmount || 0),
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status: statusMap[bill.status] || bill.status,
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generatedAt: bill.generatedAt ? new Date(bill.generatedAt).toLocaleString('zh-CN') : '',
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});
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}
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// Sheet 2: 费用明细
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const ws2 = workbook.addWorksheet('费用明细');
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ws2.columns = [
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{ header: '账单ID', key: 'billId', width: 10 },
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{ header: '学生姓名', key: 'studentName', width: 14 },
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{ header: '费用类型', key: 'expenseType', width: 12 },
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{ header: '说明', key: 'description', width: 24 },
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{ header: '计费天数', key: 'days', width: 10 },
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{ header: '宿舍总人天', key: 'totalRoomDays', width: 12 },
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{ header: '宿舍总费用', key: 'roomTotal', width: 12 },
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{ header: '学生应付', key: 'studentAmount', width: 12 },
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];
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ws2.getRow(1).font = { bold: true };
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ws2.getRow(1).fill = { type: 'pattern', pattern: 'solid', fgColor: { argb: 'FFE0E0E0' } };
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for (const bill of bills) {
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for (const item of bill.items || []) {
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ws2.addRow({
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billId: bill.id,
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studentName: (bill as any).student?.name || '-',
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expenseType: item.expenseType,
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description: item.description,
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days: item.days,
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totalRoomDays: item.totalRoomDays,
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roomTotal: Number(item.roomTotalAmount),
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studentAmount: Number(item.studentAmount),
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});
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}
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}
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res.setHeader(
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'Content-Type',
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'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
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);
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res.setHeader('Content-Disposition', `attachment; filename=bills_${Date.now()}.xlsx`);
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await workbook.xlsx.write(res);
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res.end();
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}
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/**
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* 导出单个学生的 PDF 账单
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*/
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async exportStudentPdf(billId: number, res: Response) {
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const bill = await this.billRepo.findOne({
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where: { id: billId },
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relations: ['student', 'items'],
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});
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if (!bill) {
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res.status(404).json({ message: '账单不存在' });
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return;
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}
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// 查询该学生的当前可用押金。草稿账单只展示余额，不预生成抵扣金额。
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const deposits = await this.depositRepo
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.createQueryBuilder('d')
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.where('d.studentId = :sid', { sid: bill.studentId })
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.andWhere('d.status = :status', { status: 'paid' })
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.getMany();
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const availableDeposit = deposits.reduce((s, d) => s + Number(d.amount || 0), 0);
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const totalAmount = Number(bill.totalAmount || 0);
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const depositDeducted = Number(bill.depositDeductedAmount || 0);
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const doc = new PDFDocument({ size: 'A4', margin: 50 });
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res.setHeader('Content-Type', 'application/pdf');
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res.setHeader('Content-Disposition', `attachment; filename=bill_${billId}.pdf`);
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doc.pipe(res);
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// 注册中文字体（优先使用系统字体，兼容 macOS 和 Linux）
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const fontPaths = [
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'/System/Library/Fonts/PingFang.ttc', // macOS
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'/usr/share/fonts/opentype/noto/NotoSansCJK-Regular.ttc', // Linux Noto
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'/usr/share/fonts/truetype/noto/NotoSansCJK-Regular.ttc',
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'/usr/share/fonts/google-noto-cjk/NotoSansCJK-Regular.ttc',
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'/usr/share/fonts/noto-cjk/NotoSansSC-Regular.otf',
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'/usr/share/fonts/wqy-microhei/wqy-microhei.ttc', // Linux WenQuanYi
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'/usr/share/fonts/truetype/wqy/wqy-microhei.ttc',
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];
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let fontRegistered = false;
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const fs = require('fs');
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for (const fp of fontPaths) {
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try {
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if (fs.existsSync(fp)) {
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doc.registerFont('Chinese', fp);
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doc.font('Chinese');
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fontRegistered = true;
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break;
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}
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} catch {}
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}
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if (!fontRegistered) {
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// 如果没有中文字体，使用 Helvetica（中文可能乱码）
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doc.font('Helvetica');
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}
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const statusMap: Record<string, string> = {
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draft: '草稿',
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paid: '已结清',
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};
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// 标题
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doc.fontSize(20).text('恭学教育基地水电费账单', { align: 'center' });
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doc.moveDown(0.5);
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doc
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.fontSize(10)
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.fillColor('#666')
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.text(`生成时间: ${new Date().toLocaleString('zh-CN')}`, { align: 'center' });
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doc.moveDown(1);
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// 基本信息
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doc.fontSize(12).fillColor('#000');
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doc.text(`学生姓名: ${(bill as any).student?.name || '-'}`);
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doc.text(`计费周期: ${bill.periodStart} ~ ${bill.periodEnd}`);
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doc.text(`账单状态: ${statusMap[bill.status] || bill.status}`);
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doc.moveDown(0.5);
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// 金额汇总
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doc.fontSize(14).text('费用汇总', { underline: true });
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doc.moveDown(0.3);
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doc.fontSize(12);
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doc.text(`分摊费用: ¥${Number(bill.sharedAmount).toFixed(2)}`);
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doc.text(`个人费用: ¥${Number(bill.personalAmount).toFixed(2)}`);
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doc
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.fontSize(14)
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.fillColor('#007AFF')
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.text(`应付总额: ¥${totalAmount.toFixed(2)}`);
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doc.moveDown(0.3);
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if (availableDeposit > 0 || depositDeducted > 0) {
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doc
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.fontSize(11)
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.fillColor('#52C41A')
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.text(`可用押金: ¥${availableDeposit.toFixed(2)}`);
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if (depositDeducted > 0) {
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doc
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.fontSize(11)
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.fillColor('#FA8C16')
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.text(`已扣押金: -¥${depositDeducted.toFixed(2)}`);
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}
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}
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doc.moveDown(1);
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// 明细表格
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doc.fontSize(14).fillColor('#000').text('费用明细', { underline: true });
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doc.moveDown(0.5);
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const items = bill.items || [];
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const tableTop = doc.y;
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const colWidths = [120, 180, 60, 60, 70];
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const headers = ['费用类型', '说明', '天数', '总人天', '金额(元)'];
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// 表头
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doc.fontSize(10).fillColor('#333');
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let x = 50;
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for (let i = 0; i < headers.length; i++) {
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doc.text(headers[i], x, tableTop, { width: colWidths[i], align: 'left' });
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x += colWidths[i];
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}
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doc.moveDown(0.3);
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doc.moveTo(50, doc.y).lineTo(540, doc.y).stroke('#ccc');
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doc.moveDown(0.2);
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// 数据行
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for (const item of items) {
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const y = doc.y;
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x = 50;
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doc.fontSize(9).fillColor('#000');
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doc.text(item.expenseType || '', x, y, { width: colWidths[0] });
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x += colWidths[0];
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doc.text(item.description || '', x, y, { width: colWidths[1] });
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x += colWidths[1];
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doc.text(String(item.days || 0), x, y, { width: colWidths[2] });
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x += colWidths[2];
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doc.text(String(item.totalRoomDays || 0), x, y, { width: colWidths[3] });
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x += colWidths[3];
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doc.text(Number(item.studentAmount).toFixed(2), x, y, { width: colWidths[4] });
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doc.moveDown(0.8);
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}
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doc.moveDown(2);
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doc
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.fontSize(8)
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.fillColor('#999')
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.text('本账单由恭学教育基地管理系统自动生成', { align: 'center' });
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doc.end();
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}
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}
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