const { program } = require('commander')
const parser = require('./parser')
const utils = require('./utils')
const axios = require('axios')
const ProgressBar = require('progress')
const https = require('https')
const chalk = require('chalk')

program
  .usage('[OPTIONS]...')
  .option('-d, --debug', 'Debug mode')
  .option('-c, --country <country>', 'Comma-separated list of country codes', '')
  .option('-e, --exclude <exclude>', 'Comma-separated list of country codes to be excluded', '')
  .option('--delay <delay>', 'Delay between parser requests', 1000)
  .option('--timeout <timeout>', 'Set timeout for each request', 5000)
  .parse(process.argv)

const config = program.opts()

const offlineStatusCodes = [404, 410, 500, 501]
const instance = axios.create({
  timeout: config.timeout,
  maxContentLength: 200000,
  httpsAgent: new https.Agent({
    rejectUnauthorized: false
  }),
  validateStatus: function (status) {
    return !offlineStatusCodes.includes(status)
  }
})

const ignore = ['Geo-blocked', 'Not 24/7']

const stats = { broken: 0 }

async function main() {
  console.info(`\nStarting...`)
  console.time('Done in')
  if (config.debug) {
    console.info(chalk.yellow(`INFO: Debug mode enabled\n`))
  }
  const playlists = parseIndex()

  for (const playlist of playlists) {
    await loadPlaylist(playlist.url).then(checkStatus).then(savePlaylist).then(done)
  }

  finish()
}

function parseIndex() {
  console.info(`Parsing 'index.m3u'...`)
  let playlists = parser.parseIndex()
  playlists = utils.filterPlaylists(playlists, config.country, config.exclude)
  console.info(`Found ${playlists.length} playlist(s)\n`)

  return playlists
}

async function loadPlaylist(url) {
  console.info(`Processing '${url}'...`)
  return parser.parsePlaylist(url)
}

async function checkStatus(playlist) {
  let bar
  if (!config.debug) {
    bar = new ProgressBar('  Testing: [:bar] :current/:total (:percent) ', {
      total: playlist.channels.length
    })
  }
  const results = []
  const total = playlist.channels.length
  for (const [index, channel] of playlist.channels.entries()) {
    const current = index + 1
    const counter = chalk.gray(`[${current}/${total}]`)
    if (bar) bar.tick()
    if (
      (channel.status && ignore.map(i => i.toLowerCase()).includes(channel.status.toLowerCase())) ||
      (!channel.url.startsWith('http://') && !channel.url.startsWith('https://'))
    ) {
      results.push(channel)
      if (config.debug) {
        console.info(`  ${counter} ${chalk.green('online')} ${chalk.white(channel.url)}`)
      }
    } else {
      const CancelToken = axios.CancelToken
      const source = CancelToken.source()
      const timeout = setTimeout(() => {
        source.cancel()
      }, config.timeout)

      await instance
        .get(channel.url, { cancelToken: source.token })
        .then(() => {
          clearTimeout(timeout)
          results.push(channel)
          if (config.debug) {
            console.info(`  ${counter} ${chalk.green('online')} ${chalk.white(channel.url)}`)
          }
        })
        .then(utils.sleep(config.delay))
        .catch(err => {
          clearTimeout(timeout)
          if (err.response && offlineStatusCodes.includes(err.response.status)) {
            if (config.debug) {
              console.info(`  ${counter} ${chalk.red('offline')} ${chalk.white(channel.url)}`)
            }
            stats.broken++
          } else {
            results.push(channel)
            if (config.debug) {
              console.info(`  ${counter} ${chalk.green('online')} ${chalk.white(channel.url)}`)
            }
          }
        })
    }
  }

  playlist.channels = results

  return playlist
}

async function savePlaylist(playlist) {
  const original = utils.readFile(playlist.url)
  const output = playlist.toString({ raw: true })

  if (original === output) {
    console.info(`No changes have been made.`)
    return false
  } else {
    utils.createFile(playlist.url, output)
    console.info(`Playlist has been updated. Removed ${stats.broken} links.`)
  }

  return true
}

async function done() {
  console.info(` `)
}

function finish() {
  console.timeEnd('Done in')
}

main()