update recommendation.js, generate 5 random products for new user

backend/controllers/recommendation.js

@@ -3,7 +3,43 @@ const db = require("../utils/database");
 // TODO: Get the recommondaed product given the userID
 exports.RecommondationByUserId = async (req, res) => {
   const { id } = req.body;
+
   try {
+    const [recommendation] = await db.execute(
+      "select * from Recommendation where UserID = ? limit 1", [id]
+    );
+    if (recommendation.length === 0) {
+      const [data] = await db.execute(
+        `
+    SELECT
+      P.ProductID,
+      P.Name AS ProductName,
+      P.Price,
+      P.Date AS DateUploaded,
+      U.Name AS SellerName,
+      I.URL AS ProductImage,
+      C.Name AS Category
+    FROM Product P
+    JOIN Image_URL I ON P.ProductID = I.ProductID
+    JOIN User U ON P.UserID = U.UserID
+    JOIN Category C ON P.CategoryID = C.CategoryID
+    JOIN (
+      SELECT ProductID
+      FROM Product
+      ORDER BY RAND()
+      LIMIT 5
+    ) RandomProducts ON P.ProductID = RandomProducts.ProductID
+    WHERE I.URL IS NOT NULL;
+    `
+      );
+
+      console.log("Random products for new user:", data);
+      return res.json({
+        success: true,
+        message: "Random products fetched for new user",
+        data,
+      });
+    } else{
     const [data, fields] = await db.execute(
       `
       WITH RankedImages AS (
@@ -43,6 +79,7 @@ exports.RecommondationByUserId = async (req, res) => {
       message: "Products fetched successfully",
       data,
     });
+  }
   } catch (error) {
     console.error("Error finding products:", error);
     return res.status(500).json({