refactoring

src/services/purchaseService.js

@@ -0,0 +1,59 @@
+import db from "../config/database.js";
+
+class PurchaseService {
+    static async getPurchasesByUserId(userId, limit, offset) {
+        try {
+            return await db.allAsync(`
+                SELECT
+                    p.*,
+                    pr.name as product_name,
+                    pr.description,
+                    l.country,
+                    l.city,
+                    l.district
+                FROM purchases p
+                    JOIN products pr ON p.product_id = pr.id
+                    JOIN locations l ON pr.location_id = l.id
+                WHERE p.user_id = ?
+                ORDER BY p.purchase_date DESC
+                LIMIT ?
+                OFFSET ?
+            `, [userId, limit, offset]);
+
+        } catch (error) {
+            console.error('Error get purchases:', error);
+            throw error;
+        }
+    }
+
+    static async getPurchaseById(purchaseId) {
+        try {
+            return await db.getAsync(`
+                SELECT
+                    p.*, 
+                    pr.name as product_name,
+                    pr.description,
+                    l.country,
+                    l.city,
+                    l.district
+                FROM purchases p
+                    JOIN products pr ON p.product_id = pr.id
+                    JOIN locations l ON pr.location_id = l.id
+                WHERE p.id = ?
+            `, [purchaseId]);
+        } catch (error) {
+            console.error('Error get purchase:', error);
+            throw error;
+        }
+
+    }
+
+    static async createPurchase(userId, productId, walletType, quantity, totalPrice) {
+        await db.runAsync(
+            'INSERT INTO purchases (user_id, product_id, wallet_type, tx_hash, quantity, total_price) VALUES (?, ?, ?, ?, ?, ?)',
+            [userId, productId, walletType, "null", quantity, totalPrice]
+        );
+    }
+}
+
+export default PurchaseService