'use strict'

const util = require('util')
const assert = require('assert-plus')

const LDAPResult = require('../messages').LDAPResult

/// --- Globals

const CODES = require('./codes')
const ERRORS = []

/// --- Error Base class

function LDAPError (message, dn, caller) {
  if (Error.captureStackTrace) { Error.captureStackTrace(this, caller || LDAPError) }

  this.lde_message = message
  this.lde_dn = dn
}
util.inherits(LDAPError, Error)
Object.defineProperties(LDAPError.prototype, {
  name: {
    get: function getName () { return 'LDAPError' },
    configurable: false
  },
  code: {
    get: function getCode () { return CODES.LDAP_OTHER },
    configurable: false
  },
  message: {
    get: function getMessage () {
      return this.lde_message || this.name
    },
    set: function setMessage (message) {
      this.lde_message = message
    },
    configurable: false
  },
  dn: {
    get: function getDN () {
      return (this.lde_dn ? this.lde_dn.toString() : '')
    },
    configurable: false
  }
})

/// --- Exported API

module.exports = {}
module.exports.LDAPError = LDAPError

// Some whacky games here to make sure all the codes are exported
Object.keys(CODES).forEach(function (code) {
  module.exports[code] = CODES[code]
  if (code === 'LDAP_SUCCESS') { return }

  let err = ''
  let msg = ''
  const pieces = code.split('_').slice(1)
  for (let i = 0; i < pieces.length; i++) {
    const lc = pieces[i].toLowerCase()
    const key = lc.charAt(0).toUpperCase() + lc.slice(1)
    err += key
    msg += key + ((i + 1) < pieces.length ? ' ' : '')
  }

  if (!/\w+Error$/.test(err)) { err += 'Error' }

  // At this point LDAP_OPERATIONS_ERROR is now OperationsError in $err
  // and 'Operations Error' in $msg
  module.exports[err] = function (message, dn, caller) {
    LDAPError.call(this, message, dn, caller || module.exports[err])
  }
  module.exports[err].constructor = module.exports[err]
  util.inherits(module.exports[err], LDAPError)
  Object.defineProperties(module.exports[err].prototype, {
    name: {
      get: function getName () { return err },
      configurable: false
    },
    code: {
      get: function getCode () { return CODES[code] },
      configurable: false
    }
  })

  ERRORS[CODES[code]] = {
    err: err,
    message: msg
  }
})

module.exports.getError = function (res) {
  assert.ok(res instanceof LDAPResult, 'res (LDAPResult) required')

  const errObj = ERRORS[res.status]
  const E = module.exports[errObj.err]
  return new E(res.errorMessage || errObj.message,
    res.matchedDN || null,
    module.exports.getError)
}

module.exports.getMessage = function (code) {
  assert.number(code, 'code (number) required')

  const errObj = ERRORS[code]
  return (errObj && errObj.message ? errObj.message : '')
}

/// --- Custom application errors

function ConnectionError (message) {
  LDAPError.call(this, message, null, ConnectionError)
}
util.inherits(ConnectionError, LDAPError)
module.exports.ConnectionError = ConnectionError
Object.defineProperties(ConnectionError.prototype, {
  name: {
    get: function () { return 'ConnectionError' },
    configurable: false
  }
})

function AbandonedError (message) {
  LDAPError.call(this, message, null, AbandonedError)
}
util.inherits(AbandonedError, LDAPError)
module.exports.AbandonedError = AbandonedError
Object.defineProperties(AbandonedError.prototype, {
  name: {
    get: function () { return 'AbandonedError' },
    configurable: false
  }
})

function TimeoutError (message) {
  LDAPError.call(this, message, null, TimeoutError)
}
util.inherits(TimeoutError, LDAPError)
module.exports.TimeoutError = TimeoutError
Object.defineProperties(TimeoutError.prototype, {
  name: {
    get: function () { return 'TimeoutError' },
    configurable: false
  }
})