import path from 'path'
import as from './common/async'
import dl from './common/download'
import crypto from 'crypto'

const values = require(path.join(process.cwd(), 'values.json'))

let externalTracks = {}

function createHash (data) {
  return crypto.createHash('sha1').update(data.artist + data.name).digest('hex')
    .substr(0, 8)
}

async function getTrackMetaReal (id) {
  if (!id || !externalTracks[id]) return null
  let trdata = externalTracks[id]
  if (trdata.file) return trdata

  let trsrch = 'ytsearch1:' + trdata.artist + ' - ' + trdata.title
  let dldata = await dl.getVideoInfo(trsrch)

  externalTracks[id] = {
    id: trdata.id,
    title: trdata.title,
    artist: trdata.artist,
    file: dldata.url,
    duration: dldata.duration,
    external: true
  }

  return externalTracks[id]
}

async function search (track, limit = 30) {
  if (!values.lastfm) return []
  let data
  try {
    data = await as.GET(`http://ws.audioscrobbler.com/2.0/?method=track.search&track=${track}&api_key=${values.lastfm}&format=json&limit=${limit}`)
    data = JSON.parse(data)
  } catch (e) {
    console.warn(e.stack)
    return []
  }
  if (!data.results || !data.results.trackmatches || !data.results.trackmatches.track) return
  let final = []
  for (let i in data.results.trackmatches.track) {
    let res = data.results.trackmatches.track[i]
    try {
      let tr = { artist: res.artist, title: res.name, external: true, id: createHash(res) }
      externalTracks[tr.id] = tr
      final.push(tr)
    } catch (e) {
      continue
    }
  }
  return final
}

export default {search, getTrackMetaReal}