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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/generateExcelTemplate.utill.js
+
+const ExcelJS = require("exceljs");
+
+exports.generateExcelTemplate = async (columns, vendors) => {
+  const workbook = new ExcelJS.Workbook();
+
+  // =========================
+  // Template Sheet
+  // =========================
+
+  const worksheet = workbook.addWorksheet("Template");
+
+  const headers = columns.map((col) =>
+    col.is_required ? `${col.column_name} *` : col.column_name,
+  );
+
+  const headerRow = worksheet.addRow(headers);
+
+  headerRow.eachCell((cell) => {
+    cell.font = { bold: true };
+    cell.alignment = { vertical: "middle", horizontal: "center" };
+  });
+
+  headers.forEach((header, i) => {
+    worksheet.getColumn(i + 1).width = Math.max(header.length + 5, 20);
+  });
+
+  columns.forEach((col, index) => {
+    const headerCell = worksheet.getCell(1, index + 1);
+
+    if (col.is_required) {
+      headerCell.fill = {
+        type: "pattern",
+        pattern: "solid",
+        fgColor: { argb: "FFF4CCCC" },
+      };
+
+      headerCell.font = {
+        bold: true,
+        color: { argb: "FF000000" },
+      };
+    } else {
+      headerCell.fill = {
+        type: "pattern",
+        pattern: "solid",
+        fgColor: { argb: "FFFFF2CC" },
+      };
+
+      headerCell.font = {
+        bold: true,
+        color: { argb: "FF000000" },
+      };
+    }
+
+    if (col.validation_type === "number") {
+      for (let i = 2; i <= 100; i++) {
+        worksheet.getCell(i, index + 1).dataValidation = {
+          type: "whole",
+          operator: "greaterThanOrEqual",
+          formulae: [0],
+          showErrorMessage: true,
+          error: "Please enter a valid number",
+        };
+      }
+    }
+  });
+
+  worksheet.views = [{ state: "frozen", ySplit: 1 }];
+
+  // =========================
+  // Vendors Sheet
+  // =========================
+  const vendorSheet = workbook.addWorksheet("Vendors");
+
+  const vendorHeader = vendorSheet.addRow(["Supplier ID", "Supplier Name"]);
+
+  vendorHeader.eachCell((cell) => {
+    cell.font = {
+      bold: true,
+      color: { argb: "FFFFFFFF" },
+    };
+
+    cell.alignment = {
+      vertical: "middle",
+      horizontal: "center",
+    };
+
+    cell.fill = {
+      type: "pattern",
+      pattern: "solid",
+      fgColor: { argb: "4472C4" },
+    };
+  });
+
+  // Add vendor rows
+  vendors.forEach((vendor) => {
+    vendorSheet.addRow([vendor.vendor_id, vendor.name]);
+  });
+
+  // Optional styling
+  vendorSheet.columns = [{ width: 25 }, { width: 35 }];
+
+  vendorSheet.views = [{ state: "frozen", ySplit: 1 }];
+
+  return workbook;
+};