/**
 * @author Bruno Bornsztein <bruno@missingmethod.com>
 * @copyright 2007 Curbly LLC
 * @package Glider
 * @license MIT
 * @url http://www.missingmethod.com/projects/glider/
 * @version 0.0.4
 * @dependencies prototype.js 1.5.1+, effects.js
 */

/*  Thanks to Andrew Dupont for refactoring help and code cleanup - http://andrewdupont.net/  */


Glider = Class.create();
Object.extend(Object.extend(Glider.prototype, Abstract.prototype), {
        initialize: function(wrapper, options){
            this.scrolling  = false;
            this.wrapper    = $(wrapper);
            this.scroller   = this.wrapper.down('div.scroller');
            this.sections   = this.wrapper.getElementsBySelector('div.section');
            this.options    = Object.extend({ controlsEvent:'click', duration: 1.0, frequency: 3 }, options || {});

            this.sections.each( function(section, index) {
              section._index = index;
            });    

            this.events = {
              click: this.click.bind(this)
            };

            this.addObservers();
                        if(this.options.initialSection) this.moveTo(this.options.initialSection, this.scroller, { duration:this.options.duration });  // initialSection should be the id of the section you want to show up on load
                        if(this.options.autoGlide) this.start();
          },
        
  addObservers: function() {
                this.controls = this.wrapper.getElementsBySelector('.controls a.square'); //dodana klasa square, by odróżnić od nawigacji next/prev
                this.controls.invoke('observe', this.options.controlsEvent, this.events.click);
  },    

  click: function(event) {
                this.stop();
    var element = Event.findElement(event, 'a.square'); //dodana klasa square, by odróżnić od nawigacji next/prev
    if (this.scrolling) this.scrolling.cancel();
    
                moveToHere = this.wrapper.down('#'+element.href.split("#")[1])
    this.moveTo(moveToHere, this.scroller, { duration:this.options.duration });     
    Event.stop(event);

                this.controls.each(function(control){
                        if (control == element) {
                                control.addClassName("active")
                        }else{
                                control.removeClassName("active")
                        }                       
                });
  },

  moveTo: function(element, container, options){
    this.current = $(element);

			var a_section = 'a_' + this.current.id;
			//$(a_section).addClassName('active');
			var controls = this.wrapper.getElementsBySelector('div.controls a.square');

			controls.each(function(control){
				var control_id = 'a_' + control.href.split("#")[1];
				var element_id = 'a_' + element.id;
//				if (element_id=='a_undefined') {element_id = 'a_section' + this.options.zacznij}
//				alert('control_id: ' + control_id + ' / element_id: ' + element_id);

				if (control_id == element_id) {
					control.addClassName("active")
				}
				else {
  					control.removeClassName("active")
				}
			});

    Position.prepare();
    var containerOffset = Position.cumulativeOffset(container),
      elementOffset = Position.cumulativeOffset($(element));

    this.scrolling = new Effect.SmoothScroll(container, 
      {duration:options.duration, x:(elementOffset[0]-containerOffset[0]), y:(elementOffset[1]-containerOffset[1])});

    return false;
  },
                
  next: function(){
    this.stop(); //dodane, by po użyciu nawigacji, zatrzymać pokaz
    if (this.current) {
      var currentIndex = this.current._index;
      var nextIndex = (this.sections.length - 1 == currentIndex) ? 0 : currentIndex + 1;      
    } else var nextIndex = 1;

    this.moveTo(this.sections[nextIndex], this.scroller, { 
      duration: this.options.duration
    });
  },
        
  previous: function(){
    this.stop(); //dodane, by po użyciu nawigacji, zatrzymać pokaz
    if (this.current) {
      var currentIndex = this.current._index;
      var prevIndex = (currentIndex == 0) ? this.sections.length - 1 : 
       currentIndex - 1;
    } else var prevIndex = this.sections.length - 1;
    
    this.moveTo(this.sections[prevIndex], this.scroller, { 
      duration: this.options.duration
    });
  },

        stop: function()
        {
                clearTimeout(this.timer);
        },
        
        start: function()
        {
                this.periodicallyUpdate();
        },
                
        periodicallyUpdate: function()
        { 
                if (this.timer != null) {
                        clearTimeout(this.timer);
                        this.next();
                }
                this.timer = setTimeout(this.periodicallyUpdate.bind(this), this.options.frequency*1000);
        }

});

Effect.SmoothScroll = Class.create();
Object.extend(Object.extend(Effect.SmoothScroll.prototype, Effect.Base.prototype), {
  initialize: function(element) {
    this.element = $(element);
    var options = Object.extend({
      x:    0,
      y:    0,
      mode: 'absolute'
    } , arguments[1] || {}  );
    this.start(options);
  },
  setup: function() {
    if (this.options.continuous && !this.element._ext ) {
      this.element.cleanWhitespace();
      this.element._ext=true;
      this.element.appendChild(this.element.firstChild);
    }
   
    this.originalLeft=this.element.scrollLeft;
    this.originalTop=this.element.scrollTop;
   
    if(this.options.mode == 'absolute') {
      this.options.x -= this.originalLeft;
      this.options.y -= this.originalTop;
    } 
  },
  update: function(position) {   
    this.element.scrollLeft = this.options.x * position + this.originalLeft;
    this.element.scrollTop  = this.options.y * position + this.originalTop;
  }
});