require 'net-ldap'

class Ldap
  def initialize(username, password, host, port, base)
    ldap_settings = { host: host, port: port, auth: { method: :simple, username: username, password: password } }
    @ldap = Net::LDAP.new(ldap_settings)
    @base = base
  end

  def find_user_by_email(email)
    search_for_user_by_attribute('proxyAddresses', "smtp:#{email}")
  end

  def find_user_by_username(username)
    search_for_user_by_attribute('sAMAccountName', username)
  end

  private
  def search_for_user_by_attribute(attribute, value)
    filter = Net::LDAP::Filter.eq(attribute, value)
    result = @ldap.search(base: @base, filter: filter)
    result.first unless result.nil?
  end
end