const { EmbedBuilder } = require('discord.js');
const { DebugBuilder } = require("./utilities/debugBuilder");
const log = new DebugBuilder("server", "libUtils");
const { NodeHtmlMarkdown } = require('node-html-markdown');

/**
 * sleep - sleep/wait
 * @constructor
 */
exports.runAfter = async (toRun, timeout = 10000) => {
  log.DEBUG(`Running '${toRun}' after ${timeout / 1000} seconds`);
  setTimeout(toRun, timeout)
}

/**
 * Normalize a port into a number, string, or false.
 * 
 * @param {*} val Value to be normalized
 * @returns Normalized value
 */
exports.normalizePort = (val) => {
  var port = parseInt(val, 10);

  if (isNaN(port)) {
    // named pipe
    return val;
  }

  if (port >= 0) {
    // port number
    return port;
  }

  return false;
}

/**
 * Event listener for HTTP server "error" event.
 */
exports.onError = (error) => {
  if (error.syscall !== 'listen') {
    throw error;
  }

  var bind = typeof port === 'string'
    ? 'Pipe ' + port
    : 'Port ' + port;

  // handle specific listen errors with friendly messages
  switch (error.code) {
    case 'EACCES':
      log.ERROR(bind + ' requires elevated privileges');
      process.exit(1);
      break;
    case 'EADDRINUSE':
      log.ERROR(bind + ' is already in use');
      process.exit(1);
      break;
    default:
      throw error;
  }
}

exports.sendPost = (post, channel, callback) => {
  const title = post.title;
  const link = post.link;
  const content = NodeHtmlMarkdown.translate(post.content);
  const postId = post.postId;
  const pubDate = new Date(post.pubDate).toISOString() ?? new Date().toISOString();
  log.DEBUG("Sending an RSS post to discord", title, postId)

  const rssMessage = new EmbedBuilder()
    .setColor(0x0099FF)
    .setTitle(title)
    .setURL(link)
    .setDescription(`${content}`)
    .addFields({ name: 'Published', value: pubDate, inline: true })
    .setTimestamp()
    .setFooter({ text: 'Brought to you by Emmelia.' });

  try{
    channel.send({ embeds: [rssMessage] });
    return callback(undefined, true);
  }  
  catch (err){
    log.ERROR("Error sending message: ", err);
    return callback(err, undefined);
  }  
}