'use strict'

const querystring = require('querystring')
const url = require('url')
const { DN } = require('@ldapjs/dn')
const filter = require('@ldapjs/filter')

module.exports = {

  parse: function (urlStr, parseDN) {
    let parsedURL
    try {
      parsedURL = new url.URL(urlStr)
    } catch (error) {
      throw new TypeError(urlStr + ' is an invalid LDAP url (scope)')
    }

    if (!parsedURL.protocol || !(parsedURL.protocol === 'ldap:' || parsedURL.protocol === 'ldaps:')) { throw new TypeError(urlStr + ' is an invalid LDAP url (protocol)') }

    const u = {
      protocol: parsedURL.protocol,
      hostname: parsedURL.hostname,
      port: parsedURL.port,
      pathname: parsedURL.pathname,
      search: parsedURL.search,
      href: parsedURL.href
    }

    u.secure = (u.protocol === 'ldaps:')

    if (!u.hostname) { u.hostname = 'localhost' }

    if (!u.port) {
      u.port = (u.secure ? 636 : 389)
    } else {
      u.port = parseInt(u.port, 10)
    }

    if (u.pathname) {
      u.pathname = querystring.unescape(u.pathname.substr(1))
      u.DN = parseDN ? DN.fromString(u.pathname) : u.pathname
    }

    if (u.search) {
      u.attributes = []
      const tmp = u.search.substr(1).split('?')
      if (tmp && tmp.length) {
        if (tmp[0]) {
          tmp[0].split(',').forEach(function (a) {
            u.attributes.push(querystring.unescape(a.trim()))
          })
        }
      }
      if (tmp[1]) {
        if (tmp[1] !== 'base' && tmp[1] !== 'one' && tmp[1] !== 'sub') { throw new TypeError(urlStr + ' is an invalid LDAP url (scope)') }
        u.scope = tmp[1]
      }
      if (tmp[2]) {
        u.filter = querystring.unescape(tmp[2])
      }
      if (tmp[3]) {
        u.extensions = querystring.unescape(tmp[3])
      }

      if (!u.scope) { u.scope = 'base' }
      if (!u.filter) { u.filter = filter.parseString('(objectclass=*)') } else { u.filter = filter.parseString(u.filter) }
    }

    return u
  }

}
