edr-platform/apps/edr-passenger-api/src/modules/upgrade/upgrade.module.ts

import { Injectable, Logger, Module } from '@nestjs/common';
import { ModuleRef } from '@nestjs/core';
import { OnEvent } from '@nestjs/event-emitter';
import { AuditModule } from '../../common/audit.module';
import { BookingsModule } from '../bookings/bookings.module';
import { SeatsModule } from '../seats/seats.module';
import { SegmentsModule } from '../segments/segments.module';
import { TicketsModule } from '../tickets/tickets.module';
import { PaymentsModule } from '../payments/payments.module';
import { CurrencyModule } from '../currency/currency.module';
import { SystemConfigModule } from '../system-config/system-config.module';
import { SUPPLEMENTARY_CHARGE_PAID_EVENT } from '../reschedule/reschedule.service';
import { UpgradeController } from './upgrade.controller';
import { UpgradeService } from './upgrade.service';

/**
 * Same shape and same reason as RescheduleEventsListener: UpgradeService is request-scoped by
 * transitivity (AuditService injects REQUEST), and Nest never fires @OnEvent on request-scoped
 * providers — so the listener is a singleton that resolves the service per event.
 *
 * Two listeners on one event is fine: each looks its charge up by its own unique
 * `supplementaryChargeId` and returns silently when the charge is not theirs.
 */
@Injectable()
export class UpgradeEventsListener {
  private readonly logger = new Logger(UpgradeEventsListener.name);
  constructor(private readonly moduleRef: ModuleRef) {}

  @OnEvent(SUPPLEMENTARY_CHARGE_PAID_EVENT, { async: true })
  async onChargePaid(payload: { chargeId: string }) {
    try {
      const service = await this.moduleRef.resolve(UpgradeService, undefined, { strict: false });
      await service.applyForCharge(payload.chargeId);
    } catch (err) {
      this.logger.error(`Failed to apply upgrade for charge ${payload.chargeId}: ${err instanceof Error ? err.message : err}`);
    }
  }
}

@Module({
  imports: [AuditModule, BookingsModule, SeatsModule, SegmentsModule, TicketsModule, PaymentsModule, CurrencyModule, SystemConfigModule],
  controllers: [UpgradeController],
  providers: [UpgradeService, UpgradeEventsListener],
  exports: [UpgradeService],
})
export class UpgradeModule {}