/*
    SkeptCOM [RSS-Youtube] | Détecte les nouvelles vidéos YT via RSS
*/

    // REQUIRE, CONST, VARIABLES
const jsonfile = require('jsonfile')
const Parser = require('rss-parser')
const path = require('path')

const routage = require('../modules/routage')('rss-youtube')
let parser = new Parser({
  customFields: {
    item: [ 'author', 'media:group' ]
  }
})
const db = require('../db/rss-youtube.json')


    // FUNCTIONS
  // et on output ! YOLO !
function output(data) {
  console.log(` --> [RSS-Youtube | NV] ${data.author} | ${data.title}`)
  if (routage && routage.send) routage.send(data)
}

  // bon, on a besoin de recup le RSS, normol
async function getFeed(url) {
  return new Promise((resolve, reject) => {
    parser.parseURL(url, (err, res) => {
      if (err) return reject(err)
      resolve(res)
    })
  })
}

  // on filtre un peu, puis en fonction on output
async function parseRSS(feed, owner) {
  if (!db.timecode[owner]) db.timecode[owner] = db.timecode.lastCheck
  let cLastCheck = db.timecode[owner]
  for (let i in feed.items) {
    if (feed.items[i].isoDate > db.timecode.lastCheck || feed.items[i].isoDate > cLastCheck) {
      if (feed.items[i].isoDate > cLastCheck) cLastCheck = feed.items[i].isoDate
      let c = feed.items[i]
      c.desc = feed.items[i]['media:group']['media:description'][0].slice(0, db.config.sliceDescription) + " [...]"
      c.image = "http://i3.ytimg.com/vi/" + c.id.split(':')[2] + "/maxresdefault.jpg"
      c.url = c.link
      delete c.link
      delete c['media:group']
      if (c.isoDate > cLastCheck) cLastCheck = feed.items[i].isoDate
      output(c)
    }
  }
  db.timecode[owner] = cLastCheck
}

  // on check l'ensemble de feeds
async function checkFeeds(feeds) {
  console.log(` --- [RSS-Youtube] check @${db.timecode.lastCheck}`)
  routage.log(`check @${db.timecode.lastCheck}`)
  for (let i in feeds) {
    let feed = await getFeed(db.config.urlFeeds + feeds[i])
    try {
      await parseRSS(feed, i)
    } catch (e) {
      console.error("error while parsing feed %s", feed, e);
    }
  }

  let dateObj = new Date()
  db.timecode.lastCheck = dateObj.toISOString()

    // et on externalise la nouvelle date. Youpi !
  jsonfile.writeFile(path.resolve('./db/rss-youtube.json'), db, {spaces: 2}, (err) => {
    console.log()
    if (err) console.error(err)
  })

}


function rssLoop(time) {
  checkFeeds(db.feeds)
  setTimeout(() => {
    rssLoop(time)
  }, time)
}

    // INIT
console.log(` --- [RSS-Youtube] Load`)
routage.log(`Load`)
rssLoop(db.config.timeLoop*60*1000)