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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/validateExcel.utill.js
+
+const ExcelJS = require("exceljs");
+
+exports.validateExcel = async (buffer, columns) => {
+  const workbook = new ExcelJS.Workbook();
+  await workbook.xlsx.load(buffer);
+  const worksheet = workbook.worksheets[0];
+
+  if (!worksheet) {
+    throw { status: 400, message: "Excel sheet is empty" };
+  }
+
+  const expectedHeaders = columns.map((col) =>
+    col.is_required ? `${col.column_name} *` : col.column_name
+  );
+
+  const headerRow = worksheet.getRow(1);
+
+  for (let i = 1; i <= expectedHeaders.length; i++) {
+    const cellValue = (headerRow.getCell(i).value || "").toString().trim();
+
+    if (cellValue !== expectedHeaders[i - 1]) {
+      throw {
+        status: 400,
+        message: `Invalid header in column ${i}`,
+        expected: expectedHeaders[i - 1],
+        received: cellValue,
+      };
+    }
+  }
+
+  const errors = [];
+  const validData = [];
+
+  worksheet.eachRow((row, rowNumber) => {
+    if (rowNumber === 1) return;
+
+    let rowData = {};
+    let rowHasError = false;
+
+    columns.forEach((col, index) => {
+      let value = row.getCell(index + 1).value;
+
+      if (value && typeof value === "object") {
+        value = value.text || value.result || "";
+      }
+
+      value = value?.toString().trim() || "";
+
+      if (col.is_required && !value) {
+        errors.push({
+          row: rowNumber,
+          column: col.column_name,
+          message: "Required field is missing",
+        });
+        rowHasError = true;
+      }
+
+      if (value) {
+        if (col.validation_type === "number" && isNaN(value)) {
+          errors.push({
+            row: rowNumber,
+            column: col.column_name,
+            message: "Must be a number",
+          });
+          rowHasError = true;
+        }
+
+        if (
+          col.validation_type === "boolean" &&
+          !["true", "false"].includes(value.toLowerCase())
+        ) {
+          errors.push({
+            row: rowNumber,
+            column: col.column_name,
+            message: "Must be true or false",
+          });
+          rowHasError = true;
+        }
+      }
+
+      rowData[col.column_name] = value;
+    });
+
+    if (!rowHasError) {
+      validData.push(rowData);
+    }
+  });
+
+  return { errors, validData };
+};