/*
Author:
	luistar15, <leo020588 [at] gmail.com>
License:
	MIT License
Class
	viewer v0.9 (rev.08-12-08)
Arguments:
	items: dom collection | required
	parameters - see Parameters below
Parameters:
	sizes: obj | item sizes (px) | default: {w:480,h:240}
	mode: string OR array | 'rand','top','right','bottom','left','alpha' | default: 'rand'
	modes: array | default: ['top','right','bottom','left','alpha']
	fxOptions: object | Fx.Tween options | default: {duration:500}
	interval: int | for periodical | default: 5000
Methods:
	previous(manual): walk to previous item
		manual: bolean | default:false
	next(manual): walk to next item
		manual: bolean | default:false
	play(wait): auto walk items
		wait: boolean | required
	stop(): stop auto walk
	walk(item,manual): walk to item
		item: int | required
		manual: bolean | default:false
Requires:
	mootools 1.2 core
*/



var viewer = new Class({



	mode: 'rand',

	modes: ['alpha'],

	sizes: {w:480,h:240},

	fxOptions: {duration:500},

	interval: 4000,



	initialize: function(items,options){

		if(options) for(var o in options) this[o]=options[o];

		//

		if(this.buttons){

			this.buttons.previous.addEvent('click',this.previous.bind(this,[true]));

			this.buttons.next.addEvent('click',this.next.bind(this,[true]));

		}

		this._current = 0;

		this._previous = null;

		this.items = items.setStyle('display','none');

		this.items[this._current].setStyle('display','block');

		this.disabled = false;

		this.attrs = {

			left: ['left',-this.sizes.w,0,'px'],

			top: ['top',-this.sizes.h,0,'px'],

			right: ['left',this.sizes.w,0,'px'],

			bottom: ['top',this.sizes.h,0,'px'],

			alpha: ['opacity',0,1,'']

		};

		this.rand = this.mode=='rand';

		this.sequence = typeof(this.mode)=='object' ? this.mode : false;

		this.curseq = 0;

		this.timer = null;

	},



	walk: function(n,manual){

		if(this._current!==n && !this.disabled){

			this.disabled = true;

			if(manual){

				this.stop();

			}

			if(this.rand){

				this.mode = this.modes.getRandom();

			}else if(this.sequence){

				this.mode = this.sequence[this.curseq];

				this.curseq += this.curseq+1<this.sequence.length ? 1 : -this.curseq;

			}

			this._previous = this._current;

			this._current = n;

			var a = this.attrs[this.mode].associate(['p','f','t','u']);

			for(var i=0;i<this.items.length;i++){

				if(this._current===i){

					this.items[i].setStyles($extend({'display':'block','z-index':'2'},JSON.decode('{"'+a.p+'":"'+a.f+a.u+'"}')));

				}else if(this._previous===i){

					this.items[i].setStyles({'z-index':'1'});

				}else{

					this.items[i].setStyles({'display':'none','z-index':'0'});

				}

			}

			this.items[n].set('tween',$merge(this.fxOptions,{onComplete:this.onComplete.bind(this)})).tween(a.p,a.f,a.t);

		}

	},



	play: function(wait){

		this.stop();

		if(!wait){

			this.next();

		}

		this.timer = this.next.periodical(this.interval,this,[false]);

	},



	stop: function(){

		$clear(this.timer);

	},



	next: function(manual){

		this.walk(this._current+1<this.items.length ? this._current+1 : 0,manual);

	},



	previous: function(manual){

		this.walk(this._current>0 ? this._current-1 : this.items.length-1,manual);

	},



	onComplete: function(){

		this.disabled = false;

		this.items[this._previous].setStyle('display','none');

		if(this.onWalk) this.onWalk(this._current);

	}

});