define ['marionette', 'radio'], (Marionette, Radio)->

  class AutoLayout extends Marionette.Behavior
    defaults:
      regionViews: {}
      regionViewsOptions: {}
      events:
        loadStart: 'loader:start'
        loadStop:  'loader:stop'

    onRender: ->
      rViews   = _.result @options.regionViews
      unless _.isObject(rViews) and _.keys(rViews).length
        return throw "Invalid regionViews"

      _(rViews).each @attachView

    attachView: (rURL, rName)->
      options = _.result(@options.regionViewsOptions)[rName]
      region  = @view.getRegion rName

      evtStart = @options.events.loadStart
      evtStop  = @options.events.loadStop

      @view.trigger evtStart, rURL, region
      requirejs [rURL], (View)=>
        view = new View(options)
        region.show view

        @view.trigger evtStop, view, region

  window.Behaviors.AutoLayout = AutoLayout
return AutoLayout