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const EventEmitter = require('events')
const { resolve, dirname } = require('path')
const Config = require('@npmcli/config')
const log = require('npmlog')

// Patch the global fs module here at the app level
require('graceful-fs').gracefulify(require('fs'))

// TODO make this only ever load once (or unload) in tests
const procLogListener = require('./utils/proc-log-listener.js')

// Timers in progress
const timers = new Map()
// Finished timers
const timings = {}

const processOnTimeHandler = (name) => {
  timers.set(name, Date.now())
}

const processOnTimeEndHandler = (name) => {
  if (timers.has(name)) {
    const ms = Date.now() - timers.get(name)
    log.timing(name, `Completed in ${ms}ms`)
    timings[name] = ms
    timers.delete(name)
  } else
    log.silly('timing', "Tried to end timer that doesn't exist:", name)
}

const { definitions, flatten, shorthands } = require('./utils/config/index.js')
const { shellouts } = require('./utils/cmd-list.js')
const usage = require('./utils/npm-usage.js')

const which = require('which')

const deref = require('./utils/deref-command.js')
const setupLog = require('./utils/setup-log.js')
const cleanUpLogFiles = require('./utils/cleanup-log-files.js')
const getProjectScope = require('./utils/get-project-scope.js')

let warnedNonDashArg = false
const _load = Symbol('_load')
const _tmpFolder = Symbol('_tmpFolder')
const _title = Symbol('_title')
const pkg = require('../package.json')

class Npm extends EventEmitter {
  static get version () {
    return pkg.version
  }

  constructor () {
    super()
    this.started = Date.now()
    this.command = null
    this.timings = timings
    this.timers = timers
    process.on('time', processOnTimeHandler)
    process.on('timeEnd', processOnTimeEndHandler)
    procLogListener()
    process.emit('time', 'npm')
    this.config = new Config({
      npmPath: dirname(__dirname),
      definitions,
      flatten,
      shorthands,
    })
    this[_title] = process.title
    this.updateNotification = null
  }

  get version () {
    return this.constructor.version
  }

  get shelloutCommands () {
    return shellouts
  }

  deref (c) {
    return deref(c)
  }

  // Get an instantiated npm command
  // npm.command is already taken as the currently running command, a refactor
  // would be needed to change this
  async cmd (cmd) {
    await this.load()
    const command = this.deref(cmd)
    if (!command) {
      throw Object.assign(new Error(`Unknown command ${cmd}`), {
        code: 'EUNKNOWNCOMMAND',
      })
    }
    const Impl = require(`./commands/${command}.js`)
    const impl = new Impl(this)
    return impl
  }

  // Call an npm command
  async exec (cmd, args) {
    const command = await this.cmd(cmd)
    process.emit('time', `command:${cmd}`)

    // since 'test', 'start', 'stop', etc. commands re-enter this function
    // to call the run-script command, we need to only set it one time.
    if (!this.command) {
      process.env.npm_command = command.name
      this.command = command.name
    }

    // Options are prefixed by a hyphen-minus (-, \u2d).
    // Other dash-type chars look similar but are invalid.
    if (!warnedNonDashArg) {
      args.filter(arg => /^[\u2010-\u2015\u2212\uFE58\uFE63\uFF0D]/.test(arg))
        .forEach(arg => {
          warnedNonDashArg = true
          this.log.error('arg', 'Argument starts with non-ascii dash, this is probably invalid:', arg)
        })
    }

    const workspacesEnabled = this.config.get('workspaces')
    const workspacesFilters = this.config.get('workspace')
    if (workspacesEnabled === false && workspacesFilters.length > 0)
      throw new Error('Can not use --no-workspaces and --workspace at the same time')

    const filterByWorkspaces = workspacesEnabled || workspacesFilters.length > 0
    // normally this would go in the constructor, but our tests don't
    // actually use a real npm object so this.npm.config isn't always
    // populated.  this is the compromise until we can make that a reality
    // and then move this into the constructor.
    command.workspaces = this.config.get('workspaces')
    command.workspacePaths = null
    // normally this would be evaluated in base-command#setWorkspaces, see
    // above for explanation
    command.includeWorkspaceRoot = this.config.get('include-workspace-root')

    if (this.config.get('usage')) {
      this.output(command.usage)
      return
    }
    if (filterByWorkspaces) {
      if (this.config.get('global'))
        throw new Error('Workspaces not supported for global packages')

      return command.execWorkspaces(args, this.config.get('workspace')).finally(() => {
        process.emit('timeEnd', `command:${cmd}`)
      })
    } else {
      return command.exec(args).finally(() => {
        process.emit('timeEnd', `command:${cmd}`)
      })
    }
  }

  async load () {
    if (!this.loadPromise) {
      process.emit('time', 'npm:load')
      this.log.pause()
      this.loadPromise = new Promise((resolve, reject) => {
        this[_load]().catch(er => er).then((er) => {
          this.loadErr = er
          if (!er && this.config.get('force'))
            this.log.warn('using --force', 'Recommended protections disabled.')

          process.emit('timeEnd', 'npm:load')
          if (er)
            return reject(er)
          resolve()
        })
      })
    }
    return this.loadPromise
  }

  get loaded () {
    return this.config.loaded
  }

  get title () {
    return this[_title]
  }

  set title (t) {
    process.title = t
    this[_title] = t
  }

  async [_load] () {
    process.emit('time', 'npm:load:whichnode')
    let node
    try {
      node = which.sync(process.argv[0])
    } catch (_) {
      // TODO should we throw here?
    }
    process.emit('timeEnd', 'npm:load:whichnode')
    if (node && node.toUpperCase() !== process.execPath.toUpperCase()) {
      this.log.verbose('node symlink', node)
      process.execPath = node
      this.config.execPath = node
    }

    process.emit('time', 'npm:load:configload')
    await this.config.load()
    process.emit('timeEnd', 'npm:load:configload')

    this.argv = this.config.parsedArgv.remain
    // note: this MUST be shorter than the actual argv length, because it
    // uses the same memory, so node will truncate it if it's too long.
    // if it's a token revocation, then the argv contains a secret, so
    // don't show that.  (Regrettable historical choice to put it there.)
    // Any other secrets are configs only, so showing only the positional
    // args keeps those from being leaked.
    process.emit('time', 'npm:load:setTitle')
    const tokrev = deref(this.argv[0]) === 'token' && this.argv[1] === 'revoke'
    this.title = tokrev ? 'npm token revoke' + (this.argv[2] ? ' ***' : '')
      : ['npm', ...this.argv].join(' ')
    process.emit('timeEnd', 'npm:load:setTitle')

    process.emit('time', 'npm:load:setupLog')
    setupLog(this.config)
    process.emit('timeEnd', 'npm:load:setupLog')
    process.env.COLOR = this.color ? '1' : '0'

    process.emit('time', 'npm:load:cleanupLog')
    cleanUpLogFiles(this.cache, this.config.get('logs-max'), this.log.warn)
    process.emit('timeEnd', 'npm:load:cleanupLog')

    this.log.resume()

    process.emit('time', 'npm:load:configScope')
    const configScope = this.config.get('scope')
    if (configScope && !/^@/.test(configScope))
      this.config.set('scope', `@${configScope}`, this.config.find('scope'))
    process.emit('timeEnd', 'npm:load:configScope')

    process.emit('time', 'npm:load:projectScope')
    this.projectScope = this.config.get('scope') ||
      getProjectScope(this.prefix)
    process.emit('timeEnd', 'npm:load:projectScope')
  }

  get flatOptions () {
    const { flat } = this.config
    if (this.command)
      flat.npmCommand = this.command
    return flat
  }

  get color () {
    // This is a special derived value that takes into consideration not only
    // the config, but whether or not we are operating in a tty.
    return this.flatOptions.color
  }

  get lockfileVersion () {
    return 2
  }

  get log () {
    return log
  }

  get cache () {
    return this.config.get('cache')
  }

  set cache (r) {
    this.config.set('cache', r)
  }

  get globalPrefix () {
    return this.config.globalPrefix
  }

  set globalPrefix (r) {
    this.config.globalPrefix = r
  }

  get localPrefix () {
    return this.config.localPrefix
  }

  set localPrefix (r) {
    this.config.localPrefix = r
  }

  get globalDir () {
    return process.platform !== 'win32'
      ? resolve(this.globalPrefix, 'lib', 'node_modules')
      : resolve(this.globalPrefix, 'node_modules')
  }

  get localDir () {
    return resolve(this.localPrefix, 'node_modules')
  }

  get dir () {
    return (this.config.get('global')) ? this.globalDir : this.localDir
  }

  get globalBin () {
    const b = this.globalPrefix
    return process.platform !== 'win32' ? resolve(b, 'bin') : b
  }

  get localBin () {
    return resolve(this.dir, '.bin')
  }

  get bin () {
    return this.config.get('global') ? this.globalBin : this.localBin
  }

  get prefix () {
    return this.config.get('global') ? this.globalPrefix : this.localPrefix
  }

  set prefix (r) {
    const k = this.config.get('global') ? 'globalPrefix' : 'localPrefix'
    this[k] = r
  }

  get usage () {
    return usage(this)
  }

  // XXX add logging to see if we actually use this
  get tmp () {
    if (!this[_tmpFolder]) {
      const rand = require('crypto').randomBytes(4).toString('hex')
      this[_tmpFolder] = `npm-${process.pid}-${rand}`
    }
    return resolve(this.config.get('tmp'), this[_tmpFolder])
  }

  // output to stdout in a progress bar compatible way
  output (...msg) {
    this.log.clearProgress()
    console.log(...msg)
    this.log.showProgress()
  }
}
module.exports = Npm