const TelegramBot = require('tg-yarl');
const { markdown2Html } = require('../../services/markdown');
const opts = { parse_mode: 'Markdown' };

/**
 * sends new listings to telegram
 * @param serviceName e.g immowelt
 * @param newListings an array with newly found listings
 * @param notificationConfig config of this notification adapter
 * * @param jobKey name of the current job that is being executed
 * @returns {Promise<Void> | void}
 */
exports.send = ({ serviceName, newListings, notificationConfig, jobKey }) => {
  const { token, chatId } = notificationConfig.find((adapter) => adapter.id === 'telegram').fields;

  const bot = new TelegramBot(token);

  let message = `Job: ${jobKey} | Service _${serviceName}_ found _${newListings.length}_ new listings:\n\n`;

  message += newListings.map(
    (o) =>
      `*${shorten(o.title.replace(/\*/g, ''), 45)}*\n` +
      [o.address, o.price, o.size].join(' | ') +
      '\n' +
      `[LINK](${o.link})\n\n`
  );

  return bot.sendMessage(chatId, message, opts);
};

function shorten(str, len = 30) {
  return str.length > len ? str.substring(0, len) + '...' : str;
}

/**
 * exported config is being used in the frontend to generate the fields
 * incoming values will be the keys (and values) of the fields
 *
 */
exports.config = {
  id: __filename.slice(__dirname.length + 1, -3),
  name: 'Telegram',
  readme: markdown2Html('lib/notification/adapter/telegram.md'),
  description: 'Fredy will send new listings to your mobile, using Telegram.',
  fields: {
    token: {
      type: 'text',
      label: 'Token',
      description: 'The token needed to access this service.',
    },
    chatId: {
      type: 'chatId',
      label: 'Chat Id',
      description: 'The chat id to send messages to you.',
    },
  },
};