Screen.Login = function(modules) {
  var root = document.getElementById('login');
  var submit = root.submitButton;

  init();

  return {};

  function init() {
    initDOMEvents();
    initMessageHandlers();
    var name = modules.save.get('player.name');
    if(name != undefined && name.length > 0) {
      root.you.value = name;
      formDisable(false);
    }
  }

  function initDOMEvents() {
    root.addEventListener('submit', function(e) {
      e.preventDefault();
			modules.session.start(root.you.value);
    });
  }

  function initMessageHandlers() {
    modules.messaging.addEventListener(["LogIn"], function(o) {
			if(modules.session.is(o.from)) {
				modules.screen.select('hall');
			}
    });

    modules.messaging.addEventListener('open', function() {formDisable(false);});
    modules.messaging.addEventListener('close', function() {formDisable(true);});
  }

  function formDisable(disabled) {
    [submit, root.name].forEach(function(button) {
      button.disabled = disabled || !modules.messaging.isOn();
    });
  }
}