From 16ed1070c2ba5c1f68db3bad49ee58c92990f4a3 Mon Sep 17 00:00:00 2001
From: Patrick <50352812+Mueller-Patrick@users.noreply.github.com>
Date: Tue, 18 May 2021 00:24:00 +0200
Subject: [PATCH] BETTERZON-97: Adding API endpoint to get all products listed
 by a specific vendor (#50)

---
 .../src/models/products/products.router.ts    | 19 ++++++++++
 .../src/models/products/products.service.ts   | 38 +++++++++++++++++++
 2 files changed, 57 insertions(+)

diff --git a/Backend/src/models/products/products.router.ts b/Backend/src/models/products/products.router.ts
index f0ea9a3..dd332e5 100644
--- a/Backend/src/models/products/products.router.ts
+++ b/Backend/src/models/products/products.router.ts
@@ -87,3 +87,22 @@ productsRouter.get('/list/:ids', async (req: Request, res: Response) => {
         res.status(500).send(JSON.stringify({'message': 'Internal Server Error. Try again later.'}));
     }
 });
+
+// GET products/vendor/:id
+productsRouter.get('/vendor/:id', async (req: Request, res: Response) => {
+    const id: number = parseInt(req.params.id, 10);
+
+    if (!id) {
+        res.status(400).send('Missing parameters.');
+        return;
+    }
+
+    try {
+        const products: Products = await ProductService.findByVendor(id);
+
+        res.status(200).send(products);
+    } catch (e) {
+        console.log('Error handling a request: ' + e.message);
+        res.status(500).send(JSON.stringify({'message': 'Internal Server Error. Try again later.'}));
+    }
+});
diff --git a/Backend/src/models/products/products.service.ts b/Backend/src/models/products/products.service.ts
index c0bee72..7d397ab 100644
--- a/Backend/src/models/products/products.service.ts
+++ b/Backend/src/models/products/products.service.ts
@@ -159,3 +159,41 @@ export const findList = async (ids: [number]): Promise<Products> => {
 
     return prodRows;
 };
+
+/**
+ * Fetches and returns the products that the given vendor has price entries for
+ * @param id The id of the vendor to fetch the products for
+ */
+export const findByVendor = async (id: number): Promise<Products> => {
+    let conn;
+    let prodRows = [];
+    try {
+        conn = await pool.getConnection();
+
+        // Get the relevant product ids
+        let relevant_prod_ids = [];
+        const relevantProds = await conn.query('SELECT product_id FROM prices WHERE vendor_id = ? GROUP BY product_id', id);
+        for (let row in relevantProds) {
+            if (row !== 'meta') {
+                relevant_prod_ids.push(relevantProds[row].product_id);
+            }
+        }
+
+        // Fetch products
+        const rows = await conn.query('SELECT product_id, name, asin, is_active, short_description, long_description, image_guid, date_added, last_modified, manufacturer_id, selling_rank, category_id FROM products WHERE product_id IN (?)', [relevant_prod_ids]);
+        for (let row in rows) {
+            if (row !== 'meta') {
+                prodRows.push(rows[row]);
+            }
+        }
+
+    } catch (err) {
+        throw err;
+    } finally {
+        if (conn) {
+            conn.end();
+        }
+    }
+
+    return prodRows;
+};