class CreateAccount < ApplicationService
  def initialize(args)
    @username   = args[:username]
    @domain     = args[:ou] || "kosmos.org"
    @email      = args[:email]
    @password   = args[:password]
    @invitation = args[:invitation]
  end

  def call
    user = create_user_in_database
    add_ldap_document

    if @invitation.present?
      update_invitation(user.id)
      exchange_xmpp_contacts
    end
  end

  private

  def create_user_in_database
    User.create!(
      cn: @username,
      ou: @domain,
      email: @email,
      password: @password,
      password_confirmation: @password
    )
  end

  def update_invitation(user_id)
    @invitation.update! invited_user_id: user_id, used_at: DateTime.now
  end

  def add_ldap_document
    dn = "cn=#{@username},ou=kosmos.org,cn=users,dc=kosmos,dc=org"
    attr = {
      objectclass: ["top", "account", "person", "extensibleObject"],
      cn: @username,
      sn: @username,
      uid: @username,
      mail: @email,
      userPassword: Devise.ldap_auth_password_builder.call(@password)
    }

    ldap_client.add(dn: dn, attributes: attr)
  end

  def ldap_client
    ldap_client ||= Net::LDAP.new host: ldap_config['host'],
      port: ldap_config['port'],
      encryption: ldap_config['ssl'],
      auth: {
        method: :simple,
        username: ldap_config['admin_user'],
        password: ldap_config['admin_password']
      }
  end

  def ldap_config
    ldap_config ||= YAML.load(ERB.new(File.read("#{Rails.root}/config/ldap.yml")).result)[Rails.env]
  end

  def exchange_xmpp_contacts
    #TODO enable in development when we have easy setup of ejabberd etc.
    return if Rails.env.development?

    ejabberd = EjabberdApiClient.new
    inviter = @invitation.user

    ejabberd.add_rosteritem({
      "localuser": @username, "localhost": @domain,
      "user": inviter.cn, "host": inviter.ou,
      "nick": inviter.cn, "group": "Friends", "subs": "both"
    })
    ejabberd.add_rosteritem({
      "localuser": inviter.cn, "localhost": inviter.ou,
      "user": @username, "host": @domain,
      "nick": @username, "group": "Friends", "subs": "both"
    })
  end
end