import { TransportType } from '@nestjs-modules/mailer/dist/interfaces/mailer-options.interface';
import {
  MAILER_SMTP_PASSWORD_UNDEFINED,
  MAILER_SMTP_URL_UNDEFINED,
  MAILER_SMTP_USER_UNDEFINED,
} from 'src/errors';
import { throwErr } from 'src/utils';

function isSMTPCustomConfigsEnabled(value) {
  return value === 'true';
}

export function getMailerAddressFrom(env, config): string {
  return (
    env.INFRA.MAILER_ADDRESS_FROM ??
    config.get('MAILER_ADDRESS_FROM') ??
    throwErr(MAILER_SMTP_URL_UNDEFINED)
  );
}

export function getTransportOption(env, config): TransportType {
  const useCustomConfigs = isSMTPCustomConfigsEnabled(
    env.INFRA.MAILER_USE_CUSTOM_CONFIGS ??
      config.get('MAILER_USE_CUSTOM_CONFIGS'),
  );

  if (!useCustomConfigs) {
    console.log('Using simple mailer configuration');
    return (
      env.INFRA.MAILER_SMTP_URL ??
      config.get('MAILER_SMTP_URL') ??
      throwErr(MAILER_SMTP_URL_UNDEFINED)
    );
  } else {
    console.log('Using advanced mailer configuration');
    return {
      host: env.INFRA.MAILER_SMTP_HOST ?? config.get('MAILER_SMTP_HOST'),
      port: +(env.INFRA.MAILER_SMTP_PORT ?? config.get('MAILER_SMTP_PORT')),
      secure:
        (env.INFRA.MAILER_SMTP_SECURE ?? config.get('MAILER_SMTP_SECURE')) ===
        'true',
      auth: {
        user:
          env.INFRA.MAILER_SMTP_USER ??
          config.get('MAILER_SMTP_USER') ??
          throwErr(MAILER_SMTP_USER_UNDEFINED),
        pass:
          env.INFRA.MAILER_SMTP_PASSWORD ??
          config.get('MAILER_SMTP_PASSWORD') ??
          throwErr(MAILER_SMTP_PASSWORD_UNDEFINED),
      },
      tls: {
        rejectUnauthorized:
          (env.INFRA.MAILER_TLS_REJECT_UNAUTHORIZED ??
            config.get('MAILER_TLS_REJECT_UNAUTHORIZED')) === 'true',
      },
    };
  }
}