fix: bill

src/modules/bills/bills.service.ts

@@ -2,10 +2,13 @@ import { EntityManager } from "@mikro-orm/postgresql";
 import { BadRequestException, Injectable } from "@nestjs/common";
 import dayjs from "dayjs";
 import Decimal from "decimal.js";
+import { Workbook } from "exceljs";
+
+import { IFile } from "../utils/interfaces/IFile";
 
 import { BillListQueryDto } from "./dto/bill-list-query.dto";
 import { CreateChargeBillDto } from "./dto/create-charge-bill.dto";
-import { CreateWaterBillDto } from "./dto/create-water-bill.dto";
+import { CreateWaterBillDto, CreateWaterBillFromExcelDto } from "./dto/create-water-bill.dto";
 import { Bill } from "./entities/bill.entity";
 import { BillType } from "./enums/bill-type.enum";
 import { BillsRepository } from "./repositories/bill.repository";
@@ -81,6 +84,35 @@ export class BillsService {
     }
   }
 
+  async createWaterBillByExcel(file: IFile, dto: CreateWaterBillFromExcelDto, business: Business) {
+    const values = await this.parseWaterBillExcel(file.buffer);
+    if (values.length === 0) {
+      throw new BadRequestException("Excel file contains no valid data rows");
+    }
+    return this.createWaterBill({ ...dto, values }, business);
+  }
+
+  private async parseWaterBillExcel(buffer: Buffer): Promise<{ companyId: string; waterUsage: number }[]> {
+    const workbook = new Workbook();
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    await workbook.xlsx.load(buffer as any);
+    const worksheet = workbook.worksheets[0];
+    if (!worksheet) {
+      return [];
+    }
+    const values: { companyId: string; waterUsage: number }[] = [];
+    worksheet.eachRow((row) => {
+      const companyIdRaw = row.getCell(1).value;
+      const waterUsageRaw = row.getCell(3).value;
+      const companyId = companyIdRaw != null ? String(companyIdRaw).trim() : "";
+      const waterUsage = typeof waterUsageRaw === "number" ? waterUsageRaw : Number(waterUsageRaw);
+      if (companyId && !Number.isNaN(waterUsage) && waterUsage >= 0) {
+        values.push({ companyId, waterUsage });
+      }
+    });
+    return values;
+  }
+
   async createChargeBill(dto: CreateChargeBillDto, business: Business) {
     const { chargeRate, dueDays } = dto;
     const em = this.em.fork();