module.exports = errorHandler

var cbCalled = false
var log = require('npmlog')
var npm = require('../npm.js')
var rm = require('rimraf')
var itWorked = false
var path = require('path')
var wroteLogFile = false
var exitCode = 0
var rollbacks = npm.rollbacks
var chain = require('slide').chain
var writeStream = require('fs-write-stream-atomic')
var nameValidator = require('validate-npm-package-name')

process.on('exit', function (code) {
  log.disableProgress()
  if (!npm.config || !npm.config.loaded) return
  if (code) itWorked = false
  if (itWorked) log.info('ok')
  else {
    if (!cbCalled) {
      log.error('', 'cb() never called!')
    }

    if (wroteLogFile) {
      // just a line break
      if (log.levels[log.level] <= log.levels.error) console.error('')

      log.error(
        '',
        [
          'Please include the following file with any support request:',
          '    ' + path.resolve('npm-debug.log')
        ].join('\n')
      )
      wroteLogFile = false
    }
    if (code) {
      log.error('code', code)
    }
  }

  var doExit = npm.config.get('_exit')
  if (doExit) {
    // actually exit.
    if (exitCode === 0 && !itWorked) {
      exitCode = 1
    }
    if (exitCode !== 0) process.exit(exitCode)
  } else {
    itWorked = false // ready for next exit
  }
})

function exit (code, noLog) {
  exitCode = exitCode || process.exitCode || code

  var doExit = npm.config ? npm.config.get('_exit') : true
  log.verbose('exit', [code, doExit])
  if (log.level === 'silent') noLog = true

  if (rollbacks.length) {
    chain(rollbacks.map(function (f) {
      return function (cb) {
        npm.commands.unbuild([f], true, cb)
      }
    }), function (er) {
      if (er) {
        log.error('error rolling back', er)
        if (!code) errorHandler(er)
        else if (noLog) rm('npm-debug.log', reallyExit.bind(null, er))
        else writeLogFile(reallyExit.bind(this, er))
      } else {
        if (!noLog && code) writeLogFile(reallyExit)
        else rm('npm-debug.log', reallyExit)
      }
    })
    rollbacks.length = 0
  }
  else if (code && !noLog) writeLogFile(reallyExit)
  else rm('npm-debug.log', reallyExit)

  function reallyExit (er) {
    if (er && !code) code = typeof er.errno === 'number' ? er.errno : 1

    // truncate once it's been written.
    log.record.length = 0

    itWorked = !code

    // just emit a fake exit event.
    // if we're really exiting, then let it exit on its own, so that
    // in-process stuff can finish or clean up first.
    if (!doExit) process.emit('exit', code)
  }
}

function errorHandler (er) {
  log.disableProgress()
  // console.error('errorHandler', er)
  if (!npm.config || !npm.config.loaded) {
    // logging won't work unless we pretend that it's ready
    er = er || new Error('Exit prior to config file resolving.')
    console.error(er.stack || er.message)
  }

  if (cbCalled) {
    er = er || new Error('Callback called more than once.')
  }

  cbCalled = true
  if (!er) return exit(0)
  if (typeof er === 'string') {
    log.error('', er)
    return exit(1, true)
  } else if (!(er instanceof Error)) {
    log.error('weird error', er)
    return exit(1, true)
  }

  var m = er.code || er.message.match(/^(?:Error: )?(E[A-Z]+)/)
  if (m && !er.code) {
    er.code = m
  }

  ;[
    'type',
    'fstream_path',
    'fstream_unc_path',
    'fstream_type',
    'fstream_class',
    'fstream_finish_call',
    'fstream_linkpath',
    'stack',
    'fstream_stack',
    'statusCode',
    'pkgid'
  ].forEach(function (k) {
    var v = er[k]
    if (!v) return
    if (k === 'fstream_stack') v = v.join('\n')
    log.verbose(k, v)
  })

  log.verbose('cwd', process.cwd())

  var os = require('os')
  // log.error('System', os.type() + ' ' + os.release())
  // log.error('command', process.argv.map(JSON.stringify).join(' '))
  // log.error('node -v', process.version)
  // log.error('npm -v', npm.version)
  log.error('', os.type() + ' ' + os.release())
  log.error('argv', process.argv.map(JSON.stringify).join(' '))
  log.error('node', process.version)
  log.error('npm ', 'v' + npm.version)

  ;[
    'file',
    'path',
    'code',
    'errno',
    'syscall'
  ].forEach(function (k) {
    var v = er[k]
    if (v) log.error(k, v)
  })

  // just a line break
  if (log.levels[log.level] <= log.levels.error) console.error('')

  switch (er.code) {
  case 'ECONNREFUSED':
    log.error('', er)
    log.error(
      '',
      [
        '\nIf you are behind a proxy, please make sure that the',
        "'proxy' config is set properly.  See: 'npm help config'"
      ].join('\n')
    )
    break

  case 'EACCES':
  case 'EPERM':
    log.error('', er)
    log.error('', ['\nPlease try running this command again as root/Administrator.'
              ].join('\n'))
    break

  case 'ELIFECYCLE':
    log.error('', er.message)
    log.error(
      '',
      [
        '',
        'Failed at the ' + er.pkgid + ' ' + er.stage + " script '" + er.script + "'.",
        'This is most likely a problem with the ' + er.pkgname + ' package,',
        'not with npm itself.',
        'Tell the author that this fails on your system:',
        '    ' + er.script,
        'You can get their info via:',
        '    npm owner ls ' + er.pkgname,
        'There is likely additional logging output above.'
      ].join('\n')
    )
    break

  case 'ENOGIT':
    log.error('', er.message)
    log.error(
      '',
      [
        '',
        'Failed using git.',
        'This is most likely not a problem with npm itself.',
        'Please check if you have git installed and in your PATH.'
      ].join('\n')
    )
    break

  case 'EJSONPARSE':
    log.error('', er.message)
    log.error('', 'File: ' + er.file)
    log.error(
      '',
      [
        'Failed to parse package.json data.',
        'package.json must be actual JSON, not just JavaScript.',
        '',
        'This is not a bug in npm.',
        'Tell the package author to fix their package.json file.'
      ].join('\n'),
      'JSON.parse'
    )
    break

  // TODO(isaacs)
  // Add a special case here for E401 and E403 explaining auth issues?

  case 'E404':
    var msg = [er.message]
    if (er.pkgid && er.pkgid !== '-') {
      msg.push('', "'" + er.pkgid + "' is not in the npm registry.")

      var valResult = nameValidator(er.pkgid)

      if (valResult.validForNewPackages) {
        msg.push('You should bug the author to publish it (or use the name yourself!)')
      } else {
        msg.push('Your package name is not valid, because', '')

        var errorsArray = (valResult.errors || []).concat(valResult.warnings || [])
        errorsArray.forEach(function (item, idx) {
          msg.push(' ' + (idx + 1) + '. ' + item)
        })
      }

      if (er.parent) {
        msg.push("It was specified as a dependency of '" + er.parent + "'")
      }
      msg.push(
        '\nNote that you can also install from a',
        'tarball, folder, http url, or git url.'
      )
    }
    // There's no need to have 404 in the message as well.
    msg[0] = msg[0].replace(/^404\s+/, '')
    log.error('404', msg.join('\n'))
    break

  case 'EPUBLISHCONFLICT':
    log.error(
      'publish fail',
      [
        'Cannot publish over existing version.',
        "Update the 'version' field in package.json and try again.",
        '',
        'To automatically increment version numbers, see:',
        '    npm help version'
      ].join('\n')
    )
    break

  case 'EISGIT':
    log.error(
      'git',
      [
        er.message,
        '    ' + er.path,
        'Refusing to remove it. Update manually,',
        'or move it out of the way first.'
      ].join('\n')
    )
    break

  case 'ECYCLE':
    log.error(
      'cycle',
      [
        er.message,
        'While installing: ' + er.pkgid,
        'Found a pathological dependency case that npm cannot solve.',
        'Please report this to the package author.'
      ].join('\n')
    )
    break

  case 'EBADPLATFORM':
    log.error(
      'notsup',
      [
        er.message,
        'Not compatible with your operating system or architecture: ' + er.pkgid,
        'Valid OS:    ' + er.os.join(','),
        'Valid Arch:  ' + er.cpu.join(','),
        'Actual OS:   ' + process.platform,
        'Actual Arch: ' + process.arch
      ].join('\n')
    )
    break

  case 'EEXIST':
    log.error(
      [
        er.message,
        'File exists: ' + er.path,
        'Move it away, and try again.'
      ].join('\n')
    )
    break

  case 'ENEEDAUTH':
    log.error(
      'need auth',
      [
        er.message,
        'You need to authorize this machine using `npm adduser`'
      ].join('\n')
    )
    break

  case 'EPEERINVALID':
    var peerErrors = Object.keys(er.peersDepending).map(function (peer) {
      return 'Peer ' + peer + ' wants ' +
        er.packageName + '@' + er.peersDepending[peer]
    })
    log.error('peerinvalid', [er.message].concat(peerErrors).join('\n'))
    break

  case 'ECONNRESET':
  case 'ENOTFOUND':
  case 'ETIMEDOUT':
  case 'EAI_FAIL':
    log.error(
      'network',
      [
        er.message,
        'This is most likely not a problem with npm itself',
        'and is related to network connectivity.',
        'In most cases you are behind a proxy or have bad network settings.',
        '\nIf you are behind a proxy, please make sure that the',
        "'proxy' config is set properly.  See: 'npm help config'"
      ].join('\n')
    )
    break

  case 'ENOPACKAGEJSON':
    log.error(
      'package.json',
      [
        er.message,
        'This is most likely not a problem with npm itself.',
        "npm can't find a package.json file in your current directory."
      ].join('\n')
    )
    break

  case 'ETARGET':
    msg = [
      er.message,
      'This is most likely not a problem with npm itself.',
      'In most cases you or one of your dependencies are requesting',
      "a package version that doesn't exist."
    ]
    if (er.parent) {
      msg.push("\nIt was specified as a dependency of '" + er.parent + "'\n")
    }
    log.error('notarget', msg.join('\n'))
    break

  case 'ENOTSUP':
    if (er.required) {
      log.error(
        'notsup',
        [
          er.message,
          'Not compatible with your version of node/npm: ' + er.pkgid,
          'Required: ' + JSON.stringify(er.required),
          'Actual:   ' + JSON.stringify({
            npm: npm.version,
            node: npm.config.get('node-version')
          })
        ].join('\n')
      )
      break
    } // else passthrough
    /*eslint no-fallthrough:0*/

  case 'ENOSPC':
    log.error(
      'nospc',
      [
        er.message,
        'This is most likely not a problem with npm itself',
        'and is related to insufficient space on your system.'
      ].join('\n')
    )
    break

  case 'EROFS':
    log.error(
      'rofs',
      [
        er.message,
        'This is most likely not a problem with npm itself',
        'and is related to the file system being read-only.',
        '\nOften virtualized file systems, or other file systems',
        "that don't support symlinks, give this error."
      ].join('\n')
    )
    break

  case 'ENOENT':
    log.error(
      'enoent',
      [
        er.message,
        'This is most likely not a problem with npm itself',
        'and is related to npm not being able to find a file.',
        er.file ? "\nCheck if the file '" + er.file + "' is present." : ''
      ].join('\n')
    )
    break

  case 'EMISSINGARG':
  case 'EUNKNOWNTYPE':
  case 'EINVALIDTYPE':
  case 'ETOOMANYARGS':
    log.error(
      'typeerror',
      [
        er.stack,
        'This is an error with npm itself. Please report this error at:',
        '    <http://github.com/npm/npm/issues>'
      ].join('\n')
    )
    break
  default:
    log.error('', er.message || er)
    log.error(
      '',
      [
        '',
        'If you need help, you may report this error at:',
        '    <https://github.com/npm/npm/issues>'
      ].join('\n')
    )
    break
  }

  exit(typeof er.errno === 'number' ? er.errno : 1)
}

var writingLogFile = false
function writeLogFile (cb) {
  if (writingLogFile) return cb()
  writingLogFile = true
  wroteLogFile = true

  var fstr = writeStream('npm-debug.log')
  var os = require('os')
  var out = ''

  log.record.forEach(function (m) {
    var pref = [m.id, m.level]
    if (m.prefix) pref.push(m.prefix)
    pref = pref.join(' ')

    m.message.trim().split(/\r?\n/).map(function (line) {
      return (pref + ' ' + line).trim()
    }).forEach(function (line) {
      out += line + os.EOL
    })
  })

  fstr.end(out)
  fstr.on('close', cb)
}