import { Module, OnModuleInit } from '@nestjs/common';

import { CommonModule } from '../common/common.module';
import { SchedulerModule } from '../scheduler/scheduler.module';
import { SchedulerService } from '../scheduler/scheduler.service';
import { SettingsModule } from '../settings/settings.module';

import { MailRetentionService } from './mail-retention.service';
import { MAIL_TRANSPORT, MailTransport, MailWorker } from './mail-worker.service';
import { MailService } from './mail.service';
import { SmtpConfigService } from './smtp-config.service';

/** Daily, per operations.md's maintenance-jobs table (issue #234). */
const OUTBOX_RETENTION_CADENCE_SECONDS = 24 * 60 * 60;

@Module({
  imports: [CommonModule, SchedulerModule, SettingsModule],
  providers: [
    MailService,
    MailWorker,
    MailRetentionService,
    SmtpConfigService,
    {
      // Delegates per send so the wizard's SMTP changes (SmtpConfigService.
      // refresh) take effect without restarting the worker.
      provide: MAIL_TRANSPORT,
      inject: [SmtpConfigService],
      useFactory: (smtp: SmtpConfigService): MailTransport => ({
        sendMail: (mail) => smtp.transport().sendMail(mail),
      }),
    },
  ],
  exports: [MailService, SmtpConfigService],
})
export class MailModule implements OnModuleInit {
  constructor(
    private readonly scheduler: SchedulerService,
    private readonly retention: MailRetentionService,
  ) {}

  onModuleInit(): void {
    this.scheduler.register({
      name: 'mail-outbox-retention',
      cadenceSeconds: OUTBOX_RETENTION_CADENCE_SECONDS,
      run: async () => {
        await this.retention.pruneExpired();
      },
    });
  }
}