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+/**
+ * Copyright (c) 2026 Niolla
+ * All rights reserved.
+ *
+ * This source code is proprietary and confidential.
+ * Unauthorized copying, modification, distribution, or use
+ * of this file, via any medium, is strictly prohibited.
+ */
+
+// app/utills/excel/confirmOrder.excel.js
+
+const ExcelJS = require("exceljs");
+
+/**
+ * Generate Excel template buffer
+ */
+exports.generateTemplate = async (items) => {
+  const workbook = new ExcelJS.Workbook();
+  const sheet = workbook.addWorksheet("Confirm Order");
+
+  sheet.columns = [
+    { header: "Item ID", key: "id", width: 25 },
+    { header: "Item Name", key: "item_name", width: 30 },
+    { header: "Original Quantity", key: "quantity", width: 20 },
+    { header: "Confirmed Quantity", key: "confirmed_quantity", width: 20 },
+  ];
+
+  const headerRow = sheet.getRow(1);
+
+  headerRow.eachCell((cell) => {
+    cell.fill = {
+      type: "pattern",
+      pattern: "solid",
+      fgColor: { argb: "1F4E78" }, 
+    };
+
+    cell.font = {
+      bold: true,
+      color: { argb: "FFFFFF" }, 
+    };
+
+    cell.alignment = {
+      vertical: "middle",
+      horizontal: "center",
+    };
+
+    cell.border = {
+      top: { style: "thin" },
+      left: { style: "thin" },
+      bottom: { style: "thin" },
+      right: { style: "thin" },
+    };
+  });
+
+  items.forEach((item) => {
+    sheet.addRow({
+      id: item.data_id,
+      item_name: item.item_name,
+      quantity: item.quantity,
+      confirmed_quantity: item.quantity,
+    });
+  });
+
+  return workbook.xlsx.writeBuffer();
+};
+
+/**
+ * Parse uploaded Excel buffer
+ */
+exports.parseExcel = async (buffer) => {
+  const workbook = new ExcelJS.Workbook();
+  await workbook.xlsx.load(buffer);
+
+  const sheet = workbook.getWorksheet("Confirm Order");
+  if (!sheet) throw new Error("Invalid sheet name");
+
+  const confirmedMap = new Map();
+
+  sheet.eachRow((row, rowNumber) => {
+    if (rowNumber === 1) return;
+
+    const itemId = row.getCell(1).value;
+    const confirmedQty = Number(row.getCell(4).value);
+
+    if (itemId) {
+      confirmedMap.set(itemId, confirmedQty);
+    }
+  });
+
+  return confirmedMap;
+};