var https = require('https')
var packageInfo = require('../package.json')
var compareVersion = require('compare-version')
var Value = require('mutant/value')
var computed = require('mutant/computed')

module.exports = function () {
  var update = Value()
  var hidden = Value(false)
  update.sync = Value(false)
  var version = packageInfo.version
  https.get({
    host: 'api.github.com',
    path: '/repos/ssbc/patchwork/releases/latest',
    headers: {
      'user-agent': `Patchwork v${version}`
    }
  }, function (res) {
    if (res.statusCode === 200) {
      var result = ''
      res.on('data', (x) => {
        result += x
      }).on('end', () => {
        var info = JSON.parse(result)
        if (compareVersion(info.tag_name.slice(1), version) > 0) {
          update.set(info.tag_name.slice(1))
        }
        update.sync.set(true)
      })
    }
  })

  var obs = computed([update, hidden], (update, hidden) => update && !hidden ? update : false)
  obs.ignore = () => hidden.set(true)
  return obs
}