From 9415b46e9573b5c6c9861e393db0a0e0362575ff Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Patrick=20M=C3=BCller?= <patrick@mueller-patrick.tech>
Date: Sun, 16 May 2021 16:22:25 +0200
Subject: [PATCH] BETTERZON-107: Refactoring code with Proxy as design pattern

---
 Backend/src/models/prices/price.interface.ts | 23 +++++++++++++++++---
 Backend/src/models/prices/prices.service.ts  |  6 ++---
 2 files changed, 23 insertions(+), 6 deletions(-)

diff --git a/Backend/src/models/prices/price.interface.ts b/Backend/src/models/prices/price.interface.ts
index 956c9d5..702015a 100644
--- a/Backend/src/models/prices/price.interface.ts
+++ b/Backend/src/models/prices/price.interface.ts
@@ -4,7 +4,24 @@ export interface Price {
     vendor_id: number;
     price_in_cents: number;
     timestamp: Date;
-    // Only for deals
-    amazonDifference?: number;
-    amazonDifferencePercent?: number;
+}
+
+export class Deal implements Price {
+    price_id: number;
+    product_id: number;
+    vendor_id: number;
+    price_in_cents: number;
+    timestamp: Date;
+    amazonDifference: number;
+    amazonDifferencePercent: number;
+
+    constructor(price_id: number, product_id: number, vendor_id: number, price_in_cents: number, timestamp: Date, amazonDifference: number, amazonDifferencePercent: number) {
+        this.price_id = price_id;
+        this.product_id = product_id;
+        this.vendor_id = vendor_id;
+        this.price_in_cents = price_in_cents;
+        this.timestamp = timestamp;
+        this.amazonDifference = amazonDifference;
+        this.amazonDifferencePercent = amazonDifferencePercent;
+    }
 }
diff --git a/Backend/src/models/prices/prices.service.ts b/Backend/src/models/prices/prices.service.ts
index 405cfd4..0c0277b 100644
--- a/Backend/src/models/prices/prices.service.ts
+++ b/Backend/src/models/prices/prices.service.ts
@@ -15,7 +15,7 @@ const pool = mariadb.createPool({
  * Data Model Interfaces
  */
 
-import {Price} from './price.interface';
+import {Deal, Price} from './price.interface';
 import {Prices} from './prices.interface';
 
 
@@ -254,7 +254,7 @@ export const getBestDeals = async (amount: number): Promise<Prices> => {
         }
 
         // Iterate over all prices to find the products with the biggest difference between amazon and other vendor
-        let deals: Price[] = [];
+        let deals: Deal[] = [];
 
         Object.keys(allPrices).forEach(productId => {
             if (allPrices[parseInt(productId)]) {
@@ -286,7 +286,7 @@ export const getBestDeals = async (amount: number): Promise<Prices> => {
 
                 // Push only deals were the amazon price is actually higher
                 if (deal.amazonDifferencePercent > 0) {
-                    deals.push(deal as Price);
+                    deals.push(deal as Deal);
                 }
             }
         });