import { ExchangeModule, ExchangeOptions } from "@edr/api-common";
import { ConfigService } from "@nestjs/config";
import { DynamicModule } from "@nestjs/common";

import { ExchangeSettingsService } from "./exchange-settings.service";

/**
 * The app's single `ExchangeModule` registration shape: CBE endpoint config
 * from `app.cbeExchange`, with the DB-backed fallback wired in.
 *
 * `ExchangeModule` is registered per-feature-module (bookings, contracts,
 * warehouses), so this keeps the three call sites identical rather than
 * letting their options drift apart.
 */
export function registerExchangeModule(): DynamicModule {
  return ExchangeModule.forRootAsync({
    inject: [ConfigService, ExchangeSettingsService],
    useFactory: (
      config: ConfigService,
      settings: ExchangeSettingsService,
    ): ExchangeOptions => ({
      ...(config.get<ExchangeOptions>("app.cbeExchange") ?? {}),
      loadFallbackRate: () => settings.loadFallbackRate(),
      saveFallbackRate: (rate: number) => settings.saveFallbackRate(rate),
    }),
  });
}