console.time('init')

const electron = require('electron')
const app = electron.app
const ipcMain = electron.ipcMain

const parallel = require('run-parallel')

const announcement = require('./announcement')
const config = require('../config')
const crashReporter = require('../crash-reporter')
const dialog = require('./dialog')
const dock = require('./dock')
const ipc = require('./ipc')
const log = require('./log')
const menu = require('./menu')
const squirrelWin32 = require('./squirrel-win32')
const State = require('../renderer/lib/state')
const tray = require('./tray')
const updater = require('./updater')
const userTasks = require('./user-tasks')
const windows = require('./windows')

let shouldQuit = false
let argv = sliceArgv(process.argv)

// Start the app without showing the main window when auto launching on login
// (On Windows and Linux, we get a flag. On MacOS, we get special API.)
const hidden = argv.includes('--hidden') ||
  (process.platform === 'darwin' && app.getLoginItemSettings().wasOpenedAsHidden)

if (config.IS_PRODUCTION) {
  // When Electron is running in production mode (packaged app), then run React
  // in production mode too.
  process.env.NODE_ENV = 'production'
}

if (process.platform === 'win32') {
  shouldQuit = squirrelWin32.handleEvent(argv[0])
  argv = argv.filter((arg) => !arg.includes('--squirrel'))
}

if (!shouldQuit) {
  // Prevent multiple instances of app from running at same time. New instances
  // signal this instance and quit.
  shouldQuit = app.makeSingleInstance(onAppOpen)
  if (shouldQuit) {
    app.quit()
  }
}

if (!shouldQuit) {
  init()
}

function init () {
  if (config.IS_PORTABLE) {
    app.setPath('userData', config.CONFIG_PATH)
  }

  let isReady = false // app ready, windows can be created
  app.ipcReady = false // main window has finished loading and IPC is ready
  app.isQuitting = false

  parallel({
    appReady: (cb) => app.on('ready', () => cb(null)),
    state: (cb) => State.load(cb)
  }, onReady)

  function onReady (err, results) {
    if (err) throw err

    isReady = true

    windows.main.init(results.state, {hidden: hidden})
    windows.webtorrent.init()
    menu.init()

    // To keep app startup fast, some code is delayed.
    setTimeout(delayedInit, config.DELAYED_INIT)

    // Report uncaught exceptions
    process.on('uncaughtException', (err) => {
      console.error(err)
      const error = {message: err.message, stack: err.stack}
      windows.main.dispatch('uncaughtError', 'main', error)
    })
  }

  app.on('open-file', onOpen)
  app.on('open-url', onOpen)

  ipc.init()

  app.once('will-finish-launching', function () {
    crashReporter.init()
  })

  app.once('ipcReady', function () {
    log('Command line args:', argv)
    processArgv(argv)
    console.timeEnd('init')
  })

  app.on('before-quit', function (e) {
    if (app.isQuitting) return

    app.isQuitting = true
    e.preventDefault()
    windows.main.dispatch('saveState') // try to save state on exit
    ipcMain.once('savedState', () => app.quit())
    setTimeout(() => {
      console.error('Saving state took too long. Quitting.')
      app.quit()
    }, 2000) // quit after 2 secs, at most
  })

  app.on('activate', function () {
    if (isReady) windows.main.show()
  })
}

function delayedInit () {
  announcement.init()
  dock.init()
  tray.init()
  updater.init()
  userTasks.init()
}

function onOpen (e, torrentId) {
  e.preventDefault()

  if (app.ipcReady) {
    // Magnet links opened from Chrome won't focus the app without a setTimeout.
    // The confirmation dialog Chrome shows causes Chrome to steal back the focus.
    // Electron issue: https://github.com/atom/electron/issues/4338
    setTimeout(() => windows.main.show(), 100)

    processArgv([ torrentId ])
  } else {
    argv.push(torrentId)
  }
}

function onAppOpen (newArgv) {
  newArgv = sliceArgv(newArgv)

  if (app.ipcReady) {
    log('Second app instance opened, but was prevented:', newArgv)
    windows.main.show()

    processArgv(newArgv)
  } else {
    argv.push(...newArgv)
  }
}

// Remove leading args.
// Production: 1 arg, eg: /Applications/WebTorrent.app/Contents/MacOS/WebTorrent
// Development: 2 args, eg: electron .
// Test: 4 args, eg: electron -r .../mocks.js .
function sliceArgv (argv) {
  return argv.slice(config.IS_PRODUCTION ? 1
    : config.IS_TEST ? 4
    : 2)
}

function processArgv (argv) {
  let torrentIds = []
  argv.forEach(function (arg) {
    if (arg === '-n') {
      dialog.openSeedDirectory()
    } else if (arg === '-o') {
      dialog.openTorrentFile()
    } else if (arg === '-u') {
      dialog.openTorrentAddress()
    } else if (arg === '--hidden') {
      // Ignore hidden argument, already being handled
    } else if (arg.startsWith('-psn')) {
      // Ignore Mac launchd "process serial number" argument
      // Issue: https://github.com/feross/webtorrent-desktop/issues/214
    } else if (arg.startsWith('--')) {
      // Ignore Spectron flags
    } else if (arg === 'data:,') {
      // Ignore weird Spectron argument
    } else if (arg !== '.') {
      // Ignore '.' argument, which gets misinterpreted as a torrent id, when a
      // development copy of WebTorrent is started while a production version is
      // running.
      torrentIds.push(arg)
    }
  })
  if (torrentIds.length > 0) {
    windows.main.dispatch('onOpen', torrentIds)
  }
}