module Maglev::BackActionConcern

def call_back_action
  maglev_redirect_on_leaving
end

def maglev_default_leave_url
  main_app.root_path
rescue StandardError
  '/'
end

def maglev_redirect_on_leaving
  case maglev_config.back_action
  when nil
    redirect_to maglev_default_leave_url
  when String
    redirect_to maglev_config.back_action
  when Symbol
    redirect_to main_app.send(maglev_config.back_action)
  when Proc
    instance_exec(maglev_site, &maglev_config.back_action)
  end
end