refactor: the whole paymanet service

src/modules/payments/factories/payment.factory.ts

@@ -3,26 +3,32 @@ import { BadGatewayException, Injectable } from "@nestjs/common";
 import { PaymentMessage } from "../../../common/enums/message.enum";
 import { GatewayEnum } from "../enums/gateway.enum";
 import { ZarinpalGateway } from "../gateways/zarinpal.gateway";
+import { IPaymentGateway, IPaymentGatewayFactory } from "../interfaces/IPayment";
 import { GatewayType } from "../types/gateway.type";
 
 @Injectable()
-export class PaymentGatewayFactory {
-  constructor(private readonly ZarinpalGateway: ZarinpalGateway) {}
+export class PaymentGatewayFactory implements IPaymentGatewayFactory {
+  private readonly gateways: Map<GatewayType, IPaymentGateway>;
 
-  //************************ *
-  getPaymentGateway(provider: GatewayType) {
-    switch (provider) {
-      case "zarinpal":
-        return this.ZarinpalGateway;
-
-      default:
-        throw new BadGatewayException(PaymentMessage.PAYMENT_GATEWAY_NOT_FOUND);
-    }
+  constructor(private readonly zarinpalGateway: ZarinpalGateway) {
+    this.gateways = new Map<GatewayType, IPaymentGateway>();
+    this.initializeGateways();
+  }
+
+  private initializeGateways(): void {
+    this.gateways.set(GatewayEnum.ZARINPAL, this.zarinpalGateway);
+  }
+
+  getPaymentGateway(provider: GatewayType): IPaymentGateway {
+    const gateway = this.gateways.get(provider);
+    if (!gateway) {
+      throw new BadGatewayException(PaymentMessage.PAYMENT_GATEWAY_NOT_FOUND);
+    }
+    return gateway;
   }
 
-  //************************ */
   getAvailablePaymentGateways() {
-    const gateways = [{ name: GatewayEnum.ZARINPAL }];
+    const gateways = Array.from(this.gateways.keys()).map((name) => ({ name: name as GatewayEnum }));
     return { gateways };
   }
 }