/*
  Milkbox - required: mootools.js v1.2 core + more: Assets
  v1.3.1
    - feature: hide milkbox links hover default firefox tooltips
    - feature: hide select and textarea tags while playing
    
    - fix: you can use milkbox with image links that contains url variables (ex. image.jpg?id=77&lang=ita)
    - fix: a little preload problem when using 2-image galleries
    
    
  by Luca Reghellin (http://www.reghellin.com) July 2008, MIT-style license.
  Inspiration from Slimbox by Christophe Beyls (http://www.digitalia.be) 
  and from THE VERY FIRST MAN ON THE MOON: Lokesh Dhakar (http://www.lokeshdhakar.com/projects/lightbox2/)
  AND OF COURSE, SPECIAL THANKS TO THE MOOTOOLS DEVELOPERS
*/


var Milkbox = new Class({

  Implements:Options,
  
  options:{//set all the options here
    overlayOpacity:0.7,
    topPosition:40,
    initialWidth:250,
    initialHeight:250,
    resizeDuration:500,
    resizeTransition:'sine:in:out',/*function (ex. Transitions.Sine.easeIn) or string (ex. 'quint:out')*/
    hoverBackgroundPosition:'0 -23px',
    autoPlay:false,
    autoPlayDelay:7,
    removeTitle:false
  },
  
  initialize: function(options){
    
    this.setOptions(options);
    this.galleries = [];
    this.currentImage = null;
    this.currentIndex = null;
    this.currentGallery = null;
    
    this.specialDescription = null;//for showThisImage
    this.activated = false;//used in showThisImage 
    
    this.mode = null;//'singleImage','imageGallery','showThisImage'
    this.closed = true;
    this.busy = true;//to control keyboard and autoplay events
    
    this.intObj = null;
    
    this.formtags = null;
    
    this.loadedImages = [];//to check the preloaded images
    
    this.prepareGalleries();
    //if no galleries, stop here and prevent extra memory usage.
    //so you can keep milkbox in every page of a site.
    if(this.galleries.length == 0){ return; };
        
    this.initMilkbox();
    
  },//end init
  
  initMilkbox:function(){

    this.prepareHTML();
    this.prepareEffects();
    this.prepareEvents();
    
    this.activated = true;
    this.formtags = $$('select','textarea');
  },
  
  //runs only 1 time per gallery
  openMilkbox:function(gallery,index){
    if(this.formtags.length != 0){ this.formtags.setStyle('display','none') };

    this.overlay.setStyles({ 'top': -$(window).getScroll().y,'height':$(window).getScrollSize().y+$(window).getScroll().y });
    
    this.center.addClass('mbLoading');
    this.center.setStyle('top',$(window).getScroll().y+this.options.topPosition);

    this.currentGallery = gallery;
    this.currentIndex = index;
    this.overlay.tween('opacity',this.options.overlayOpacity);//onComplete: center.tween opacity
    
    if(gallery.length == 1){
      this.mode = 'singleImage';
      this.loadImages(gallery[index].href);
    } else {
      this.mode = 'imageGallery';
      
      var images = gallery.map(function(item){ return item.href; });

      $$(this.prev, this.next, this.count).setStyles({'display':'block'});
      var border = this.center.getStyle('border-right-width').toInt();//border-right is just ok for design purposes..
      var navWidth = this.prev.getSize().x+this.next.getSize().x+this.close.getSize().x+border;
      this.navigation.setStyle('width',navWidth);
      this.description.setStyle('margin-right',navWidth);
      
      var next = (index != images.length-1) ? images[index+1] : images[0];
      var prev = (index != 0) ? images[index-1] : images[images.length-1];
      var preloads = (prev == next) ? [prev] : [prev,next]; //if gallery.length == 2, then prev == next
            
      this.loadImages(images[index],preloads);
    }
    
    this.closed = false;
  },
  
  //call with js
  showThisImage:function(image,description){
    
    //if init was not done because of the absence of galleries, do it now.
    if(!this.activated){ this.initMilkbox(); }
    
    this.mode = 'showThisImage';
    
    this.specialDescription = description;
    
    this.overlay.setStyles({ 'top': -$(window).getScroll().y,'height':$(window).getScrollSize().y+$(window).getScroll().y });
    
    this.center.addClass('mbLoading');
    this.center.setStyle('top',$(window).getScroll().y+this.options.topPosition);
    
    this.overlay.tween('opacity',this.options.overlayOpacity);//onComplete: center.tween opacity
    this.loadImages(image);
    
    this.closed = false;
  },

   //see loadImages()
   showImage:function(image){
     
     if(this.closed){ return; };//if you close the Milkbox and an onload event is still running
     
     var imageBoxSize = this.image.getSize();
     
     this.image.setStyles({'opacity':0, 'width':'', 'height':''});
     
     var imageSize = new Hash(image.getProperties('width','height')).map(function(item, index){
      return item.toInt();
    });
     
     var centerSize = new Hash(this.center.getStyles('width','height')).map(function(item, index){
       return item.toInt();
    });
     
     var targetSize = {};
     
     if(imageSize.width != centerSize.width){ 
       targetSize.width = imageSize.width;
       targetSize.marginLeft = -(imageSize.width/2).round();
     };
     
     var gap = (imageBoxSize.y > 0) ? centerSize.height - imageBoxSize.y : 0; 

     var targetHeight = imageSize.height + gap;

      targetSize.height = targetHeight;
      
    //so nav doesn't move when you click next/prev
    this.image.setStyles({'width':imageSize.width, 'height':imageSize.height})

     this.center.removeClass('mbLoading');
     this.center.morph(targetSize);//onComplete: show all items
     
   },
   
  loadImages:function(currentImage,preloads){
      var loadImage = new Asset.image(currentImage, { onload:function(img){
        this.currentImage = img;
        if(!this.loadedImages.contains(currentImage)){ this.loadedImages.push(currentImage); };//see next/prev events
        $$(this.description,this.navigation).setStyle('visibility','hidden');
        this.navigation.setStyle('height','');//reset the height setted in center.morph.onComplete
        $$(this.next,this.prev,this.close).setStyle('backgroundPosition','0 0');
        this.showImage(this.currentImage);
      }.bindWithEvent(this)});
      
      if(preloads && !this.loadedImages.contains(preloads)){
        var preloadImages = new Asset.images(preloads, { onComplete:function(img){
          preloads.each(function(item){
            if(!(this.loadedImages.contains(item))){ this.loadedImages.push(item); }
          }.bind(this));
        }.bindWithEvent(this)});
      };
      
  },
  
  //all the main events
  prepareEvents:function(){
  
    //galleries
    this.galleries.each(function(gallery){
      $$(gallery).addEvent('click',function(e){
        var button=($(e.target).match('a')) ? $(e.target) : $(e.target).getParent('a');
        e.preventDefault();
        
        if(this.options.autoPlay){
          this.autoPlay({ gallery:gallery, index:gallery.indexOf(button) });
        }
        
        else{ this.openMilkbox(gallery, gallery.indexOf(button)); }
        
      }.bindWithEvent(this));
    },this);
    
    //next, prev, see next_prev_aux()
    this.next.addEvent('click',this.next_prev_aux.bindWithEvent(this,'next'));
    this.prev.addEvent('click',this.next_prev_aux.bindWithEvent(this,'prev'));
    
    //keyboard next/prev/close
    $(window.document).addEvent('keydown',function(e){
      if(this.mode != 'imageGallery' || this.busy == true){ return; };
      if(e.key == 'right' || e.key == 'space'){ this.next_prev_aux(e,'next'); }
      else if(e.key == 'left'){ this.next_prev_aux(e,'prev'); }
      else if(e.key == 'esc'){ this.closeMilkbox(); };
    }.bindWithEvent(this));
    
    
    //css hover doesn't work in ie6, so I must do it via js...
    $$(this.next,this.prev,this.close).addEvents({
        'mouseover':function(e){ 
          var button=($(e.target).match('a')) ? $(e.target) : $(e.target).getParent('a');
          button.setStyle('backgroundPosition',this.options.hoverBackgroundPosition); 
        }.bindWithEvent(this),
        'mouseout':function(){ this.setStyle('backgroundPosition','0 0'); }
    });

    //overlay
    this.overlay.get('tween').addEvent('onComplete',function(){
      if(this.overlay.getStyle('opacity') == this.options.overlayOpacity){ 
        this.center.tween('opacity',1);
      } else if(this.overlay.getStyle('opacity') == 0) {
        this.overlay.setStyles({'height':0,'top':''});
      };
    }.bindWithEvent(this));
    
    //center
    this.center.get('morph').addEvent('onComplete',function(){
      
        this.image.grab(this.currentImage);
       this.image.tween('opacity',1);
              
       var d = (!(this.mode == 'showThisImage')) ? this.currentGallery[this.currentIndex].retrieve('title') : this.specialDescription;
       if($chk(d)){ this.description.innerHTML = d; };
       
       if(this.mode == 'imageGallery'){ 
         this.count.appendText((this.currentIndex+1)+' of '+this.currentGallery.length); 
       }
       
       var currentCenterHeight = this.center.getStyle('height').toInt();
       
       this.navigation.setStyle('height',this.bottom.getStyle('height').toInt());//to have the right-border height == total bottom height
       var bottomSize = this.bottom.getSize().y;
       
       //after the 1st time, currentCenterHeight is always > this.image.getSize().y
       var targetOffset = (currentCenterHeight > this.image.getSize().y) ? (this.bottom.getSize().y+this.image.getSize().y)-currentCenterHeight : bottomSize;
        
       this.bottom.setStyle('display','none');//to avoid rendering problems during setFinalHeight

       this.center.retrieve('setFinalHeight').start(currentCenterHeight,currentCenterHeight+targetOffset);
      /**/
    }.bindWithEvent(this));
    
    this.center.retrieve('setFinalHeight').addEvent('onComplete',function(){
      
      this.bottom.setStyles({'visibility':'visible','display':'block'});
      $$(this.description,this.navigation).setStyle('visibility','visible');
      //reset overlay height based on position and height
      var scrollSize = $(window).getScrollSize().y;
      var scrollTop = $(window).getScroll().y;
      
      this.overlay.setStyle('height',scrollSize+scrollTop);
      this.busy = false;
      
    }.bindWithEvent(this));
    
    //reset overlay height and position onResize
    window.addEvent('resize',function(){
      if(this.overlay.getStyle('opacity') == 0){ return; };//resize only if visible
      var scrollSize = $(window).getScrollSize().y;
      var scrollTop = $(window).getScroll().y;
      this.overlay.setStyles({ 'height':scrollSize+scrollTop,'top':-scrollTop });
    }.bindWithEvent(this))

    //close
    $$(this.overlay,this.image,this.close).addEvent('click',function(){ this.closeMilkbox(); }.bindWithEvent(this));
    
  },
  
  next_prev_aux:function(e,direction){
    
    if(e){ 
      e.preventDefault();
      if(this.intObj){ $clear(this.intObj); this.intObj = null; };
    } //if there's no event obj, than this is called by autoPlay()
    
    else{ if(this.busy){ return; } }//stop autoplay()
    
    this.busy = true; //for keyboard and autoplay
    
    var backupIndex = this.currentIndex;
    
    if(direction == "next"){
      var i= (this.currentIndex != this.currentGallery.length-1) ? this.currentIndex += 1 : this.currentIndex = 0;
      var _i= (this.currentIndex != this.currentGallery.length-1) ? this.currentIndex + 1 : 0;
    } else {
      var i= (this.currentIndex != 0) ? this.currentIndex -= 1 : this.currentIndex = this.currentGallery.length-1;
      var _i= (this.currentIndex != 0) ? this.currentIndex - 1 : this.currentGallery.length-1;    
    };
    
    this.image.empty();
    this.description.empty();
    this.count.empty();
    
    if(!this.loadedImages.contains(this.currentGallery[i].href)){ 
      this.center.addClass('mbLoading');
    };
    this.loadImages(this.currentGallery[i].href,[this.currentGallery[_i].href]);
  },
  
  autoPlay:function(obj){//obj: gallery, index, delay (in seconds)
    
    var g = (obj && obj.gallery && ($type(obj.gallery) == 'array')) ? obj.gallery : Milkbox.galleries[0];
    var i = (obj && obj.index && ($type(obj.index) == 'number')) ? obj.index : 0;
    var d = (obj && obj.delay && ($type(obj.delay) == 'number')) ? obj.delay*1000 : this.options.autoPlayDelay*1000;
    if(d < this.options.resizeDuration*2){ d = this.options.resizeDuration*2 };
    
    Milkbox.openMilkbox(g,i);
    if(this.mode != 'imageGallery'){ return; };
    this.intObj = this.next_prev_aux.periodical(d,this,[null,'next']);
    
  },
  
  closeMilkbox:function(){
    this.cancelAllEffects();
    if(this.intObj){ $clear(this.intObj); };
    
    this.currentImage = null;
    this.currentIndex = null;
    this.currentGallery = null;
     
    $$(this.prev, this.next, this.count).setStyle('display','none');
    var border = this.center.getStyle('border-right-width').toInt();
    var navWidth = this.close.getSize().x+border;
    this.navigation.setStyles({'width':navWidth,'height':'','visibility':'hidden'});
    this.description.setStyle('margin-right',navWidth);
    this.description.empty();
    this.bottom.setStyles({'visibility':'hidden','display':''});
    
     this.image.setStyles({'opacity':0, 'width':'', 'height':''});
     this.image.empty();
     
     this.count.empty();
    
    this.center.setStyles({'opacity':0,'width':this.options.initialWidth,'height':this.options.initialHeight,'marginLeft':-(this.options.initialWidth/2)});
    this.overlay.tween('opacity',0);//see onComplete in prepareEvents() 
    
    if(this.formtags.length != 0){ this.formtags.setStyle('display','') };
    
    this.mode = null;
    this.closed = true;
  },
  
  cancelAllEffects:function(){
    this.overlay.get('tween').cancel();
    this.center.get('morph').cancel();
    this.center.get('tween').cancel();
    this.center.retrieve('setFinalHeight').cancel();
    this.image.get('tween').cancel();
  },
  
  prepareEffects:function(){
    this.overlay.set('tween',{ duration:'short',link:'cancel' });
    this.center.set('tween',{ duration:'short',link:'chain' });
    this.center.set('morph',{ duration:this.options.resizeDuration,link:'chain',transition:this.options.resizeTransition });
    this.center.store('setFinalHeight',new Fx.Tween(this.center,{property:'height',duration:'short'}));
    this.image.set('tween',{ link:'chain' });
  },
  
  prepareGalleries:function(){
    var families = [];
    var milkbox_a = [];
    
    $$('a').each(function(a){
      //test 'milkbox' and link extension, and collect all milkbox links
      if(a.rel && a.rel.test(/^prodimg/i) && a.href.split('?')[0].test(/\.(gif|jpg|png)$/i)){
        if(a.rel.length>7 && !families.contains(a.rel)){ families.push(a.rel); };
        milkbox_a.push(a);
      }
    },this);

    //console.log(milkbox_a)
    
    //create an array of arrays with all galleries
    milkbox_a.each(function(a){
      $(a).store('href',a.href);
      $(a).store('rel',a.rel);
      $(a).store('title',a.title);
      if(this.options.removeTitle){ $(a).removeProperty('title'); }
      if(a.rel.length > 7){
        families.each(function(f,i){
          if(a.rel == f){
            if(!this.galleries[i]){ this.galleries[i] = [] };
            this.galleries[i].push($(a));
          };
        },this);
      } else { this.galleries.push([$(a)]); };
    },this);
    
    //console.log(this.galleries)
  },
    
  prepareHTML:function(){    
    
    this.overlay = new Element('div', { 'id':'mbOverlay','styles':{ 'opacity':0,'visibility':'visible','height':0,'overflow':'hidden' }}).inject($(document.body));
    
    this.center = new Element('div', {'id':'mbCenter', 'styles':{'width':this.options.initialWidth,'height':this.options.initialHeight,'marginLeft':-(this.options.initialWidth/2),'opacity':0/**/}}).inject($(document.body));
    this.image = new Element('div', {'id':'mbImage'}).inject(this.center);
    
    this.bottom = new Element('div',{'id':'mbBottom'}).inject(this.center).setStyle('visibility','hidden');
    this.navigation = new Element('div',{'id':'mbNavigation'}).setStyle('visibility','hidden');
    this.description = new Element('div',{'id':'mbDescription'}).setStyle('visibility','hidden');

    this.bottom.adopt(this.navigation, this.description, new Element('div',{'class':'clear'}));
    
    this.close = new Element('a',{'id':'mbCloseLink'});
    this.next = new Element('a',{'id':'mbNextLink'});
    this.prev = new Element('a',{'id':'mbPrevLink'});
    this.count = new Element('span',{'id':'mbCount'});
    
    $$(this.next, this.prev, this.count).setStyle('display','none');
    
    this.navigation.adopt(this.close, this.next, this.prev,new Element('div',{'class':'clear'}), this.count);

  }
  
});//END MILKBOX;

window.addEvent('domready', function(){ 
  Milkbox = new Milkbox();
});