var resolve = require('path').resolve
var createReadStream = require('graceful-fs').createReadStream
var readFileSync = require('graceful-fs').readFileSync

var tap = require('tap')
var cat = require('concat-stream')
var Negotiator = require('negotiator')

var server = require('./lib/server.js')
var common = require('./lib/common.js')

var tgz = resolve(__dirname, './fixtures/underscore/1.3.3/package.tgz')

tap.test("fetch accepts github api's json", function (t) {
  server.expect('/underscore/-/underscore-1.3.3', function (req, res) {
    t.equal(req.method, 'GET', 'got expected method')

    var negotiator = new Negotiator(req)

    // fetching a tarball from `api.github.com` returns a 415 error if json is
    // not accepted
    if (negotiator.mediaTypes().indexOf('application/vnd.github+json') === -1) {
      res.writeHead(415, {
        'Content-Type': 'application/json'
      })
    } else {
      res.writeHead(302, {
        'Content-Type': 'text/html',
        'Location': '/underscore/-/underscore-1.3.3.tgz'
      })
    }

    res.end()
  })

  server.expect('/underscore/-/underscore-1.3.3.tgz', function (req, res) {
    t.equal(req.method, 'GET', 'got expected method')

    res.writeHead(200, {
      'Content-Type': 'application/x-tar',
      'Content-Encoding': 'gzip'
    })

    createReadStream(tgz).pipe(res)
  })

  var client = common.freshClient()
  var defaulted = {}
  client.fetch(
    'http://localhost:1337/underscore/-/underscore-1.3.3',
    defaulted,
    function (er, res) {
      t.ifError(er, 'loaded successfully')

      var sink = cat(function (data) {
        t.deepEqual(data, readFileSync(tgz))
        t.end()
      })

      res.on('error', function (error) {
        t.ifError(error, 'no errors on stream')
      })

      res.pipe(sink)
    }
  )
})