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 + "'.",
          'Make sure you have the latest version of node.js and npm installed.',
          'If you do, 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

    case 'EISDIR':
      log.error(
        'eisdir',
        [
          er.message,
          'This is most likely not a problem with npm itself',
          'and is related to npm not being able to find a package.json in',
          'a package you are trying to install.'
        ].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)
}