const Module = require('module')
const path = require('path')
const v8 = require('v8')

Module.globalPaths.push(path.resolve(__dirname, '../spec/node_modules'))

// We want to terminate on errors, not throw up a dialog
process.on('uncaughtException', (err) => {
  console.error('Unhandled exception in main spec runner:', err)
  process.exit(1)
})

// Tell ts-node which tsconfig to use
process.env.TS_NODE_PROJECT = path.resolve(__dirname, '../tsconfig.spec.json')
process.env.ELECTRON_DISABLE_SECURITY_WARNINGS = 'true'

const { app, protocol } = require('electron')

v8.setFlagsFromString('--expose_gc')
app.commandLine.appendSwitch('js-flags', '--expose_gc')
// Prevent the spec runner quiting when the first window closes
app.on('window-all-closed', () => null)
// TODO: This API should _probably_ only be enabled for the specific test that needs it
// not the entire test suite
app.commandLine.appendSwitch('ignore-certificate-errors')

// Use fake device for Media Stream to replace actual camera and microphone.
app.commandLine.appendSwitch('use-fake-device-for-media-stream')

global.standardScheme = 'app'
global.zoomScheme = 'zoom'
protocol.registerSchemesAsPrivileged([
  { scheme: global.standardScheme, privileges: { standard: true, secure: true } },
  { scheme: global.zoomScheme, privileges: { standard: true, secure: true } },
  { scheme: 'cors-blob', privileges: { corsEnabled: true, supportFetchAPI: true } },
  { scheme: 'cors', privileges: { corsEnabled: true, supportFetchAPI: true } },
  { scheme: 'no-cors', privileges: { supportFetchAPI: true } },
  { scheme: 'no-fetch', privileges: { corsEnabled: true } }
])

app.whenReady().then(() => {
  require('ts-node/register')

  const argv = require('yargs')
    .boolean('ci')
    .array('files')
    .string('g').alias('g', 'grep')
    .boolean('i').alias('i', 'invert')
    .argv

  const Mocha = require('mocha')
  const mochaOptions = {}
  if (process.env.MOCHA_REPORTER) {
    mochaOptions.reporter = process.env.MOCHA_REPORTER
  }
  if (process.env.MOCHA_MULTI_REPORTERS) {
    mochaOptions.reporterOptions = {
      reporterEnabled: process.env.MOCHA_MULTI_REPORTERS
    }
  }
  const mocha = new Mocha(mochaOptions)

  if (!process.env.MOCHA_REPORTER) {
    mocha.ui('bdd').reporter('tap')
  }
  mocha.timeout(30000)

  if (argv.grep) mocha.grep(argv.grep)
  if (argv.invert) mocha.invert()

  // Read all test files.
  const walker = require('walkdir').walk(__dirname, {
    no_recurse: true
  })

  // This allows you to run specific modules only:
  // npm run test -match=menu
  const moduleMatch = process.env.npm_config_match
    ? new RegExp(process.env.npm_config_match, 'g')
    : null

  const testFiles = []
  walker.on('file', (file) => {
    if (/-spec\.[tj]s$/.test(file) &&
        (!moduleMatch || moduleMatch.test(file))) {
      testFiles.push(file)
    }
  })

  const baseElectronDir = path.resolve(__dirname, '..')

  walker.on('end', () => {
    testFiles.sort()
    sortToEnd(testFiles, f => f.includes('crash-reporter')).forEach((file) => {
      if (!argv.files || argv.files.includes(path.relative(baseElectronDir, file))) {
        mocha.addFile(file)
      }
    })
    const cb = () => {
      // Ensure the callback is called after runner is defined
      process.nextTick(() => {
        process.exit(runner.failures)
      })
    }

    // Set up chai in the correct order
    const chai = require('chai')
    chai.use(require('chai-as-promised'))
    chai.use(require('dirty-chai'))

    const runner = mocha.run(cb)
  })
})

function partition (xs, f) {
  const trues = []
  const falses = []
  xs.forEach(x => (f(x) ? trues : falses).push(x))
  return [trues, falses]
}

function sortToEnd (xs, f) {
  const [end, beginning] = partition(xs, f)
  return beginning.concat(end)
}