not allow negative value

app/controllers/submission.controller.js

@@ -48,9 +48,54 @@ exports.createSubmission = async (req, res) => {
       await QuarterlyWindowsConfiguration.update({responded: currentResponded + 1,  not_responded: currentNotResponded - 1, updated_at: new Date() }, {where: { id: config.id }} );
     }
     
+    const hasNegativeNumber = (obj, fields) => {
+        return fields.find((field) => {
+          const val = obj[field];
+          if (val === null || val === undefined || val === "") return false;
+
+          const num = Number(val);
+          return !isNaN(num) && num < 0;
+        });
+      };
+
     if (products.length) {
       // products.forEach((p) => (p.submission_id = submission.id));
-      // await SubmissionProduct.bulkCreate(products);
+      // await SubmissionProduct.bulkCreate(products);      
+
+        const numericFields = [
+          "annual_installed_capacity",
+          "previous_quantity_period_one",
+          "previous_quantity_period_two",
+          "previous_quantity_period_three",
+          "previous_cost_period_one",
+          "previous_cost_period_two",
+          "previous_cost_period_three",
+
+          "current_quantity_period_one",
+          "current_quantity_period_two",
+          "current_quantity_period_three",
+          "current_cost_period_one",
+          "current_cost_period_two",
+          "current_cost_period_three",
+
+          "forecast_quantity_period_one",
+          "forecast_quantity_period_two",
+          "forecast_quantity_period_three",
+          "forecast_cost_period_one",
+          "forecast_cost_period_two",
+          "forecast_cost_period_three",
+        ];
+
+        for (let i = 0; i < products.length; i++) {
+          const invalidField = hasNegativeNumber(products[i], numericFields);
+
+          if (invalidField) {
+            return res.status(400).json({
+              status: "failed",
+              message: `Product ${i + 1}: ${invalidField} cannot be negative`,
+            });
+          }
+        }
 
         // Process products before insert
         const processedProducts = products.map((p) => {