up

src/modules/coupons/providers/coupon.service.ts

@@ -235,12 +235,23 @@ export class CouponService {
     }
   }
 
-  async generateCouponCode(restId: string): Promise<string> {
-    const code = randomBytes(6).toString('hex');
-    const existingCoupon = await this.couponRepository.findOne({ code, restaurant: { id: restId } });
-    if (existingCoupon) {
-      return this.generateCouponCode(restId);
+  generateShortCode(length = 8) {
+    const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
+    const bytes = randomBytes(length);
+    let result = '';
+
+    for (let i = 0; i < bytes.length; i++) {
+      result += chars[bytes[i] % chars.length];
     }
+
+    return result;
+  }
+
+  async generateCouponCode(restId: string): Promise<string> {
+    const code = this.generateShortCode(8);
+    const existing = await this.couponRepository.findOne({ code, restaurant: { id: restId } });
+
+    if (existing) return this.generateCouponCode(restId);
     return code;
   }
 }