const http = require('http')
const path = require('path')
const finalhandler = require('finalhandler')
const fixtures = require('webtorrent-fixtures')
const MemoryChunkStore = require('memory-chunk-store')
const series = require('run-series')
const serveStatic = require('serve-static')
const test = require('tape')
const WebTorrent = require('../../index.js')

// it should be fast to download a small torrent over local HTTP
const WEB_SEED_TIMEOUT_MS = 500

test('Download using webseed (via .torrent file)', t => {
  t.plan(6)
  t.timeoutAfter(WEB_SEED_TIMEOUT_MS)

  const parsedTorrent = Object.assign({}, fixtures.leaves.parsedTorrent)

  const httpServer = http.createServer((req, res) => {
    const done = finalhandler(req, res)
    serveStatic(path.dirname(fixtures.leaves.contentPath))(req, res, done)
  })
  let client

  httpServer.on('error', err => { t.fail(err) })

  series([
    cb => {
      httpServer.listen(cb)
    },

    cb => {
      parsedTorrent.urlList = [
        `http://localhost:${httpServer.address().port}/${fixtures.leaves.parsedTorrent.name}`
      ]

      client = new WebTorrent({ dht: false, tracker: false, lsd: false })

      client.on('error', err => { t.fail(err) })
      client.on('warning', err => { t.fail(err) })

      client.on('torrent', torrent => {
        let gotBuffer = false
        let torrentDone = false

        torrent.files.forEach(file => {
          file.getBuffer((err, buf) => {
            t.error(err)
            t.deepEqual(buf, fixtures.leaves.content, 'downloaded correct content')
            gotBuffer = true
            maybeDone()
          })
        })

        torrent.once('done', () => {
          t.pass('client downloaded torrent from webseed')
          torrentDone = true
          maybeDone()
        })

        function maybeDone () {
          if (gotBuffer && torrentDone) cb(null)
        }
      })

      client.add(parsedTorrent, { store: MemoryChunkStore })
    }
  ], err => {
    t.error(err)
    client.destroy(err => {
      t.error(err, 'client destroyed')
    })
    httpServer.close(() => {
      t.pass('http server closed')
    })
  })
})

test('Disable webseeds', t => {
  t.plan(3)
  const parsedTorrent = Object.assign({}, fixtures.leaves.parsedTorrent)

  const httpServer = http.createServer((req, res) => {
    t.fail('webseed http server should not get any requests')
  })
  let client

  httpServer.on('error', err => { t.fail(err) })

  series([
    cb => {
      httpServer.listen(cb)
    },

    cb => {
      parsedTorrent.urlList = [
        `http://localhost:${httpServer.address().port}/${fixtures.leaves.parsedTorrent.name}`
      ]

      client = new WebTorrent({ dht: false, tracker: false, lsd: false, webSeeds: false })

      client.on('error', err => { t.fail(err) })
      client.on('warning', err => { t.fail(err) })

      client.add(parsedTorrent, { store: MemoryChunkStore })

      // The test above ensures that we can download the whole torrent over webseeds within a
      // short time. Here, we wait the same amount of time and make sure no HTTP requests happen.
      setTimeout(cb, WEB_SEED_TIMEOUT_MS)
    }
  ], err => {
    t.error(err)
    client.destroy(err => {
      t.error(err, 'client destroyed')
    })
    httpServer.close(() => {
      t.pass('http server closed')
    })
  })
})