import { Generator } from './generator'
import { Collection, Storage, Logger } from '@freearhey/core'
import { Stream, Playlist, Region } from '../models'
import { PUBLIC_DIR } from '../constants'

type IndexRegionGeneratorProps = {
  streams: Collection
  regions: Collection
  logger: Logger
}

export class IndexRegionGenerator implements Generator {
  streams: Collection
  regions: Collection
  storage: Storage
  logger: Logger

  constructor({ streams, regions, logger }: IndexRegionGeneratorProps) {
    this.streams = streams
    this.regions = regions
    this.storage = new Storage(PUBLIC_DIR)
    this.logger = logger
  }

  async generate(): Promise<void> {
    let groupedStreams = new Collection()
    this.streams
      .orderBy((stream: Stream) => stream.getTitle())
      .filter((stream: Stream) => stream.isSFW())
      .forEach((stream: Stream) => {
        if (stream.noBroadcastArea()) {
          const streamClone = stream.clone()
          streamClone.groupTitle = 'Undefined'
          groupedStreams.push(streamClone)
          return
        }

        this.getStreamRegions(stream).forEach((region: Region) => {
          const streamClone = stream.clone()
          streamClone.groupTitle = region.name
          groupedStreams.push(streamClone)
        })
      })

    groupedStreams = groupedStreams.orderBy((stream: Stream) => {
      if (stream.groupTitle === 'Undefined') return 'ZZ'
      return stream.groupTitle
    })

    const playlist = new Playlist(groupedStreams, { public: true })
    const filepath = 'index.region.m3u'
    await this.storage.save(filepath, playlist.toString())
    this.logger.info(JSON.stringify({ filepath, count: playlist.streams.count() }))
  }

  getStreamRegions(stream: Stream) {
    let streamRegions = new Collection()
    stream.broadcastArea.forEach(broadcastAreaCode => {
      const [type, code] = broadcastAreaCode.split('/')
      switch (type) {
        case 'r':
          const groupedRegions = this.regions.keyBy((region: Region) => region.code)
          streamRegions.add(groupedRegions.get(code))
          break
        case 's':
          const [countryCode] = code.split('-')
          const subdivisionRegions = this.regions.filter((region: Region) =>
            region.countries.includes(countryCode)
          )
          streamRegions = streamRegions.concat(subdivisionRegions)
          break
        case 'c':
          const countryRegions = this.regions.filter((region: Region) =>
            region.countries.includes(code)
          )
          streamRegions = streamRegions.concat(countryRegions)
          break
      }
    })

    return streamRegions
  }
}