text: const helper = require('./helper')
  
  const config = {
    debug: process.env.npm_config_debug || false,
    country: process.env.npm_config_country,
    exclude: process.env.npm_config_exclude,
    epg: process.env.npm_config_epg || false,
  }
  
  let updated = 0
  
  async function main() {
    console.log(`Parsing index...`)
    const index = parseIndex()
  
    for (let item of index.items) {
      console.log(`Processing '${item.url}'...`)
      let playlist = parsePlaylist(item.url)
      if (config.debug) {
        console.log(`Sorting channels...`)
      }
      playlist = sortChannels(playlist)
      if (config.debug) {
        console.log(`Removing duplicates...`)
      }
      playlist = removeDuplicates(playlist)
  
      if (config.epg) {
        const tvgUrl = playlist.header.attrs['x-tvg-url']
        if (tvgUrl) {
          if (config.debug) {
            console.log(`Loading EPG from '${tvgUrl}'...`)
          }
          const epg = await loadEPG(tvgUrl)
          if (config.debug) {
            console.log(`Adding the missing data from EPG...`)
          }
          playlist = addDataFromEPG(playlist, epg)
        } else {
          if (config.debug) {
            console.log(`EPG source is not found`)
          }
        }
      }
  
      if (playlist.changed) {
        updatePlaylist(item.url, playlist)
        updated++
      } else {
        console.log('Nothing is changed')
      }
    }
  
    console.log(`Updated ${updated} playlist(s)`)
  
    console.log('Done.\n')
  }
  
  function parseIndex() {
    const playlist = helper.parsePlaylist('index.m3u')
    playlist.items = filterPlaylists(playlist.items, config.country, config.exclude)
  
    console.log(`Found ${playlist.items.length} playlist(s)`)
  
    return playlist
  }
  
  function parsePlaylist(url) {
    const playlist = helper.parsePlaylist(url)
  
    playlist.items = playlist.items.map((item) => {
      return helper.createChannel(item)
    })
  
    return playlist
  }
  
  function sortChannels(playlist) {
    const channels = JSON.stringify(playlist.items)
    playlist.items = helper.sortBy(playlist.items, ['title', 'url'])
    if (channels !== JSON.stringify(playlist.items)) {
      playlist.changed = true
    }
  
    return playlist
  }
  
  function removeDuplicates(playlist) {
    let buffer = {}
    const channels = JSON.stringify(playlist.items)
    playlist.items = playlist.items.filter((i) => {
      let result = typeof buffer[i.url] === 'undefined'
  
      if (result) {
        buffer[i.url] = true
      } else {
        if (config.debug) {
          console.log(`Duplicate of '${i.title}' has been removed`)
        }
      }
  
      return result
    })
  
    if (channels !== JSON.stringify(playlist.items)) {
      playlist.changed = true
    }
  
    return playlist
  }
  
  async function loadEPG(url) {
    try {
      return await helper.parseEPG(url)
    } catch (err) {
      console.error(`Error: could not load '${url}'`)
      return
    }
  }
  
  function addDataFromEPG(playlist, epg) {
    if (!epg) return playlist
  
    for (let item of playlist.items) {
      if (!item.id) continue
  
      const channel = epg.channels[item.id]
  
      if (!channel) continue
  
      if (!item.name && channel.name.length) {
        item.name = channel.name[0].value
        playlist.changed = true
        if (config.debug) {
          console.log(`Added tvg-name '${item.name}' to '${item.title}'`)
        }
      }
  
      if (!item.language && channel.name.length && channel.name[0].lang) {
        item.language = channel.name[0].lang
        playlist.changed = true
        if (config.debug) {
          console.log(`Added tvg-language '${item.language}' to '${item.title}'`)
        }
      }
  
      if (!item.logo && channel.icon.length) {
        item.logo = channel.icon[0]
        playlist.changed = true
        if (config.debug) {
          console.log(`Added tvg-logo '${item.logo}' to '${item.title}'`)
        }
      }
    }
  
    return playlist
  }
  
  function updatePlaylist(filepath, playlist) {
    helper.createFile(filepath, playlist.getHeader())
    for (let channel of playlist.items) {
      helper.appendToFile(filepath, channel.toShortString())
    }
  
    console.log(`Playlist '${filepath}' has been updated`)
  }
  
  function filterPlaylists(arr, include = '', exclude = '') {
    if (include) {
      const included = include.split(',').map((filename) => `channels/${filename}.m3u`)
  
      return arr.filter((i) => included.indexOf(i.url) > -1)
    }
  
    if (exclude) {
      const excluded = exclude.split(',').map((filename) => `channels/${filename}.m3u`)
  
      return arr.filter((i) => excluded.indexOf(i.url) === -1)
    }
  
    return arr
  }
  
  main()
  