/**
*
* @autor Mykhailo Ivankiv [neformal.lviv@gmail.com]
* Date: 08.07 /2011
* Time: 2:23 PM
* Brief description of functionality.
*/
var EventCommander =  function(){
    var events = {};
    var eventsOne = {};

    this.bind = function (ev,fn){
      var ev = ev.toLocaleLowerCase();
      ev = (ev.indexOf('on') != 0) ? 'on'+ev : ev;
      events[ev] ? events[ev].push(fn) : (events[ev]=[]).push(fn)
      return this;
    }

    this.one = function (ev,fn){
      var ev = ev.toLocaleLowerCase();
      ev = (ev.indexOf('on') != 0) ? 'on'+ev : ev;
      eventsOne[ev] ? eventsOne[ev].push(fn) : (eventsOne[ev]=[]).push(fn)
      return this;
    }

    this.trigger = function (ev,arg){
      var ev = ev.toLocaleLowerCase();
      ev = (ev.indexOf('on') != 0) ? 'on'+ev : ev;
      for (var i=0; events[ev] && i<events[ev].length;i++) events[ev][i].apply(this,arg)
      for (var i=0; eventsOne[ev] && i<eventsOne[ev].length;i++) eventsOne[ev][i].apply(this,arg);
      delete eventsOne[ev];

      return this;
    }

    this.unbind = function (ev,fn){
      var ev = ev.toLocaleLowerCase();
      ev = (ev.indexOf('on') != 0) ? 'on'+ev : ev;
      if (events[ev])
      for (var i=0; i < events[ev].length ;i++)
      if (events[ev][i].toString() === fn.toString()) {events[ev].splice(i,1); break;}

      if (eventsOne[ev])
      for (var i=0; i < eventsOne[ev].length ;i++)
      if (eventsOne[ev][i].toString() === fn.toString()) {eventsOne[ev].splice(i,1); break;}

      return this;
    }
  }