example.ts

export class ChargeProcessorFactory {
  static getProvider(): Provider<Promise<ChargeProcessor>> {
    return {
      // Interface
      provide: ChargeProcessor,
      // Factory que retorna implementação concreta
      useFactory: async (gatewayService: GatewayService) => {
        const billetGateways = await gatewayService.getGatewaysByPaymentMethod(BILLET_METHOD).toPromise();
        const creditCardGateways = await gatewayService.getGatewaysByPaymentMethod(CREDIT_CARD_METHOD).toPromise();
        const pixGateways = await gatewayService.getGatewaysByPaymentMethod(PIX_METHOD).toPromise();
        return new ChargeProcessor(billetGateways, creditCardGateways, pixGateways);
      },
      // Provider a ser injetado para utilização na factory
      inject: [GatewayService],
    };
  }
}