// == Program ==
Program : {

  initialize : function() {
    if (!$('program-tree-container')) return false; // Exit immediately if not on a Program page
    this.Tree.initialize()
  },

  Tree : {

    // Class: Item
    Item : Class.create({

      initialize : function(element_id) {
        this.element_id = element_id
        this.element = $(element_id)
        this.content_element = this.element.select('ul').first()
        this.expanded = true
        this.__add_observers()
        this.collapse(true)
      },

      toggle : function() {
        ( this.expanded ) ? this.collapse() : this.expand()
      },
      expand : function() {
        if (this.content_element) {
          new Effect.SlideDown(this.content_element, {duration : 0.2})
          this.element.addClassName('opened')
          this.expanded = true
        }
      },
      collapse : function(collapse_hard) {
        if (this.content_element) {
          (collapse_hard) ? this.content_element.hide() : new Effect.SlideUp(this.content_element, {duration : 0.1})
          this.element.removeClassName('opened')
          this.expanded = false
        }
      },

      __add_observers : function() {
        var zis = this
        this.element.observe('mouseover', function(event) {zis.__handle_mouseover(event)} ).
                     observe('mouseout',  function(event) {zis.__handle_mouseout(event)} ).
                     observe('click',     function(event) {zis.__handle_mouseclick(event)} )
      },
      __handle_mouseover : function(event) {
        this.element.addClassName('hover')
      },
      __handle_mouseout  : function(event) {
        this.element.removeClassName('hover')
      },
      __handle_mouseclick: function(event) {
        console.log('click!')
        this.toggle()
      }

    }),   // end Item class

    selector : '#program-tree-container ul li',
    collection : null, // Collection of <li> nodes, see initialize()

    initialize : function() {
      this.collection = $$(this.selector)
      this.collection.each( function(n) { new Admin.Program.Tree.Item(n) } )
    }

  } // end Tree

} // end Program