@Module({
  imports: [
    MailerModule.forRootAsync({
      inject: [ConfigService],
      useFactory: (configService: ConfigService) => {
        const config = configService.getOrThrow<Config>(CONFIG_KEY)
        const mailProvider = config.mailProviders[MailServiceProvider.MAILGUN] as MailProviderScheme

        return {
          transport: {
            host: mailProvider.host,
            port: mailProvider.port,
            auth: {
              user: mailProvider.username, 
              pass: mailProvider.password, 
            },
          },
          defaults: {
            from: `"${config.mail.senderSupportName}" <${config.mail.senderSupportEmail}>"`, // outgoing email address
            bcc: config.mail.senderSupportEmail,
          },
          preview: true, // If enabled, when send email, it will open the browser and show the email content.
          template: {
            dir: __dirname + "/templates", // This should be dir path. Ex. /dist/templates.
            // adapter: new HandlebarsAdapter(),
            adapter: new PugAdapter(),
            options: {
              strict: true,
            },
          },
        }
      },
    }),
  ],
  providers: [MailService],
  exports: [MailService],
})
export class MailModule {
}