import { Logger, File, Collection, Storage } from '@freearhey/core'
import { ChannelsParser, XML } from '../../core'
import { Channel } from 'epg-grabber'
import { Command, OptionValues } from 'commander'
import path from 'path'

const program = new Command()
program
  .requiredOption('-c, --config <config>', 'Config file')
  .option('-s, --set [args...]', 'Set custom arguments')
  .option('-o, --output <output>', 'Output file')
  .option('--clean', 'Delete the previous *.channels.xml if exists')
  .parse(process.argv)

type ParseOptions = {
  config: string
  set?: string
  output?: string
  clean?: boolean
}

const options: ParseOptions = program.opts()

async function main() {
  const storage = new Storage()
  const parser = new ChannelsParser({ storage })
  const logger = new Logger()
  const file = new File(options.config)
  const dir = file.dirname()
  const config = require(path.resolve(options.config))
  const outputFilepath = options.output || `${dir}/${config.site}.channels.xml`

  let channels = new Collection()
  if (!options.clean && (await storage.exists(outputFilepath))) {
    channels = await parser.parse(outputFilepath)
  }

  const args: {
    [key: string]: any
  } = {}

  if (Array.isArray(options.set)) {
    options.set.forEach((arg: string) => {
      const [key, value] = arg.split(':')
      args[key] = value
    })
  }

  let parsedChannels = config.channels(args)
  if (isPromise(parsedChannels)) {
    parsedChannels = await parsedChannels
  }

  channels = channels
    .mergeBy(
      new Collection(parsedChannels),
      (channel: Channel) => channel.site_id.toString() + channel.lang
    )
    .orderBy([
      (channel: Channel) => channel.lang,
      (channel: Channel) => (channel.xmltv_id ? channel.xmltv_id.toLowerCase() : '_'),
      (channel: Channel) => channel.site_id
    ])

  const xml = new XML(channels, config.site)

  await storage.save(outputFilepath, xml.toString())

  logger.info(`File '${outputFilepath}' successfully saved`)
}

main()

function isPromise(promise: any) {
  return !!promise && typeof promise.then === 'function'
}