import {Link, Store} from '../store/model';
import {Print, logger} from '../logger';
import Mail from 'nodemailer/lib/mailer';
import {config} from '../config';
import {transporter} from './email';

const {email, phone} = config.notifications;

if (phone.number.length > 0 && (!email.username || !email.password)) {
  logger.warn(
    '✖ in order to receive sms alerts, email notifications must also be configured'
  );
}

if (phone.carrier.length !== phone.number.length) {
  logger.warn(
    '✖ the number of carriers must match the number of phone numbers',
    {carrier: phone.carrier, number: phone.number}
  );
}

export function sendSms(link: Link, store: Store) {
  for (
    let i = 0;
    i < Math.max(phone.number.length, phone.carrier.length);
    i++
  ) {
    const currentNumber = phone.number[i];
    const currentCarrier = phone.carrier[i];

    if (!currentNumber) {
      logger.error(`✖ ${currentCarrier} is not associated with a number`);
      continue;
    } else if (!currentCarrier) {
      logger.error(`✖ ${currentNumber} is not associated with a carrier`);
      continue;
    }

    if (!phone.availableCarriers.has(currentCarrier)) {
      logger.error(`✖ unknown carrier ${currentCarrier}`);
      continue;
    }

    logger.debug('↗ sending sms');

    const mailOptions: Mail.Options = {
      attachments: link.screenshot
        ? [
            {
              filename: link.screenshot,
              path: `./${link.screenshot}`,
            },
          ]
        : undefined,
      from: email.username,
      subject: Print.inStock(link, store, false, true),
      text: link.cartUrl ? link.cartUrl : link.url,
      to: generateAddress(currentNumber, currentCarrier),
    };

    transporter.sendMail(mailOptions, error => {
      if (error) {
        logger.error(
          `✖ couldn't send sms to ${currentNumber} for carrier ${currentCarrier}`,
          error
        );
      } else {
        logger.info('✔ sms sent');
      }
    });
  }
}

function generateAddress(number: string, carrier: string): string {
  if (carrier && phone.availableCarriers.has(carrier)) {
    return [number, phone.availableCarriers.get(carrier)].join('@');
  }

  return '';
}