/*
  Slimbox (Extended Version 1.3.1, 2007-02-21)
  by Yukio Arita (http://homepage.mac.com/yukikun/software/slimbox_ex/)
  -   Support to show external content using iframe.
  -   Support to set content size. You can add width/height parameters
    in rev attribute of the anchor url.
    ex1) <a href="image.jpg" rev="width=50%, height=50%" rel="lightbox">
        <img src="image_thumb.jpg" alt="image"></a>
    ex2) <a href="text.html" rev="width=500, height=300" rel="lightbox">
        some text here</a>
  -   Some rendering problem with IE6 is fixed. Now you can use Slimbox in
    valid XHTML document with XML prolog.
  - Of course, license is same as original.

  Based on:
  Slimbox v1.3 - The ultimate lightweight Lightbox clone
  by Christophe Beyls (http://www.digitalia.be) - MIT-style license.
  Inspired by the original Lightbox v2 by Lokesh Dhakar.
*/

var Lightbox = {
  init: function(options){
    this.options = Object.extend({
      resizeDuration:      400,
      resizeTransition:    Fx.Transitions.sineInOut,
      initialWidth:        250,
      initialHeight:       250,
      animateCaption:      true,
      showCounter:         false,
      defaultIframeWidth : 500,
      defaultIframeHeight: 300
    }, options || {});

    // IE 6 - XML prolog problem
    if(window.ie6 && document.compatMode=="BackCompat"){
      this.options.animateCaption = false;
    }

    this.anchors = [];
    $each(document.links, function(el){
      if (el.rel && el.rel.test(/^lightbox/i)){
        el.onclick = this.click.pass(el, this);
        this.anchors.push(el);
      }
    }, this);
    this.eventKeyDown = this.keyboardListener.bindAsEventListener(this);
    this.eventPosition = this.position.bind(this);

    /*  Build float panel
      <div id="lbOverlay"></div>
      <div id="lbCenter">
        <div id="lbCanvas">
          <a id="lbPrevLink"></a>
          <a id="lbNextLink"></a>
          <!-- img or iframe element is inserted here -->
        </div>
      </div>
      <div id="lbBottomContainer">
        <div id="lbBottom">
          <a id="lbCloseLink"></a>
          <div id="lbCaption"></div>
          <div id="lbNumber"></div>
          <div style="clear:both;"></div>
        </div>
      </div>
    */

    this.overlay = new Element('div').setProperty('id', 'lbOverlay').injectInside(document.body);

    this.center = new Element('div').setProperty('id', 'lbCenter').setStyles({width: this.options.initialWidth+'px', height: this.options.initialHeight+'px', marginLeft: '-'+(this.options.initialWidth/2)+'px', display: 'none'}).injectInside(document.body);
    this.canvas = new Element('div').setProperty('id', 'lbCanvas').injectInside(this.center);
    this.prevLink = new Element('a').setProperties({id: 'lbPrevLink', href: '#'}).setStyle('display', 'none').injectInside(this.canvas);
    this.nextLink = this.prevLink.clone().setProperty('id', 'lbNextLink').injectInside(this.canvas);
    this.prevLink.onclick = this.previous.bind(this);
    this.nextLink.onclick = this.next.bind(this);

    this.bottomContainer = new Element('div').setProperty('id', 'lbBottomContainer').setStyle('display', 'none').injectInside(document.body);
    this.bottom = new Element('div').setProperty('id', 'lbBottom').injectInside(this.bottomContainer);
    new Element('a').setProperties({id: 'lbCloseLink', href: '#'}).injectInside(this.bottom).onclick = this.overlay.onclick = this.close.bind(this);
    this.caption = new Element('div').setProperty('id', 'lbCaption').injectInside(this.bottom);
    this.number = new Element('div').setProperty('id', 'lbNumber').injectInside(this.bottom);
    new Element('div').setStyle('clear', 'both').injectInside(this.bottom);

    /* Build effects */
    var nextEffect = this.nextEffect.bind(this);
    this.fx = {
      overlay: this.overlay.effect('opacity', {duration: 500}).hide(),
      resizeCenter: this.center.effects({duration: this.options.resizeDuration, transition: this.options.resizeTransition, onComplete: nextEffect}),
      image: this.canvas.effect('opacity', {duration: 500, onComplete: nextEffect}),
      bottom: this.bottomContainer.effect('height', {duration: 400, onComplete: nextEffect})
    };

    this.preloadPrev = new Image();
    this.preloadNext = new Image();
  },

  click: function(link){
    if (link.rel.length == 8) return this.show(link.href, link.title, link.rev);

    var j, itemNumber, items = [];
    this.anchors.each(function(el){
      if (el.rel == link.rel){
        for (j = 0; j < items.length; j++) if(items[j][0] == el.href && items[j][2] == el.rev) break;
        if (j == items.length){
          items.push([el.href, el.title, el.rev]);
          if (el.href == link.href && el.rev == link.rev) itemNumber = j;
        }
      }
    }, this);
    return this.open(items, itemNumber);
  },

  show: function(url, title, rev){
    return this.open([[url, title, rev]], 0);
  },

  open: function(items, itemNumber){
    this.items = items;
    this.position();
    this.setup(true);
    var wh = (window.getHeight() == 0) ? window.getScrollHeight() : window.getHeight();
    var st = document.body.scrollTop  || document.documentElement.scrollTop;
    this.top = st + (wh / 15);
    this.center.setStyles({top: this.top+'px', display: ''});
    this.fx.overlay.start(0.8);
    return this.changeItem(itemNumber);
  },

  position: function(){
    //IE6 - XML prolog problem.
    var ww = (window.getWidth() == 0) ? window.getScrollWidth()-22 : window.getWidth();
    var wh = (window.getHeight() == 0) ? window.getScrollHeight() : window.getHeight();
    var st = document.body.scrollTop  || document.documentElement.scrollTop;
    this.overlay.setStyles({top: st+'px', height: wh+'px', width:ww+'px'});
  },

  setup: function(open){
    var elements = $A(document.getElementsByTagName('object'));
    if (window.ie) elements.extend(document.getElementsByTagName('select'));
    elements.each(function(el){ el.style.visibility = open ? 'hidden' : ''; });
    var fn = open ? 'addEvent' : 'removeEvent';
    window[fn]('scroll', this.eventPosition)[fn]('resize', this.eventPosition);
    document[fn]('keydown', this.eventKeyDown);
    this.step = 0;
  },

  keyboardListener: function(event){
    switch (event.keyCode){
      case 27: case 88: case 67: this.close(); break;
      case 37: case 80: this.previous(); break;
      case 39: case 78: this.next();
    }
  },

  previous: function(){
    return this.changeItem(this.activeItem-1);
  },

  next: function(){
    return this.changeItem(this.activeItem+1);
  },

  changeItem: function(itemNumber){
    if (this.step || (itemNumber < 0) || (itemNumber >= this.items.length)) return false;
    this.step = 1;
    this.activeItem = itemNumber;

    this.bottomContainer.style.display = this.prevLink.style.display = this.nextLink.style.display = 'none';
    this.fx.image.hide();
    this.center.className = 'lbLoading';

    // discard previous content by clicking
    this.removeCurrentItem();

    // check item type
    var url = this.items[this.activeItem][0];
    var rev = this.items[this.activeItem][2];

    var re_imageURL = /\.(jpe?g|png|gif|bmp)/i;
    if( url.match(re_imageURL) ) {
      this.preload = new Image(); // JavaScript native Object
      this.preload.datatype = 'image';
      this.preload.w = this.matchOrDefault(rev, new RegExp("width=(\\d+%?)", "i"), -1); //-1 if use original size.
      this.preload.h = this.matchOrDefault(rev, new RegExp("height=(\\d+%?)", "i"), -1);
      this.preload.onload = this.nextEffect.bind(this);
      this.preload.src = url;
    }else{
      this.preload = new Object (); // JavaScript native Object
      this.preload.datatype = 'iframe';
      this.preload.w =  this.matchOrDefault(rev, new RegExp("width=(\\d+)", "i"), this.options.defaultIframeWidth);
      this.preload.h = this.matchOrDefault(rev, new RegExp("height=(\\d+)", "i"), this.options.defaultIframeHeight);
      this.preload.src = url;
      this.nextEffect(); //asynchronous loading
    }

    return false;
  },

  nextEffect: function(){
    switch (this.step++){
    case 1:
      this.center.className = '';

      // create HTML element
      if( this.preload.datatype == 'image' ) {
        var ws = (this.preload.w == -1) ? this.preload.width.toString() : this.preload.w.toString();
        var hs = (this.preload.h == -1) ? this.preload.height.toString() : this.preload.h.toString();
        this.p_width = ( q = ws.match(/(\d+)%/) ) ? q[1] * this.preload.width * 0.01 : ws;
        this.p_height = ( q = hs.match(/(\d+)%/) ) ? q[1] * this.preload.height * 0.01 : hs;
        new Element('img').setProperties({id: 'lbImage', src:this.preload.src, width:this.p_width, height:this.p_height}).injectInside(this.canvas);
        this.nextLink.style.right = '';
      }else{
        this.p_width = this.preload.w;
        this.p_height = this.preload.h;
        // Safari would not update iframe content that has static id.
        this.iframeId = "lbFrame_"+new Date().getTime();
        new Element('iframe').setProperties({id: this.iframeId, width: this.p_width, height: this.p_height, frameBorder:0, scrolling:'yes', src:this.preload.src}).injectInside(this.canvas);
        this.nextLink.style.right = '25px';
      }
      this.canvas.style.width = this.bottom.style.width = this.p_width+'px';
      this.canvas.style.height = this.prevLink.style.height = this.nextLink.style.height = this.p_height+'px';

      this.caption.setHTML(this.items[this.activeItem][1] || '');
      this.number.setHTML((!this.options.showCounter || (this.items.length == 1)) ? '' : (this.activeItem+1)+' of '+this.items.length);

      if (this.activeItem) this.preloadPrev.src = this.items[this.activeItem-1][0];
      if (this.activeItem != (this.items.length - 1)) this.preloadNext.src = this.items[this.activeItem+1][0];
      if (this.center.clientHeight != this.canvas.offsetHeight){
        var oh = (this.p_height == this.canvas.clientHeight) ? this.canvas.offsetHeight : eval(this.p_height)+18; // fix for ie
        this.fx.resizeCenter.start({height: oh});
        break;
      }

      this.step++;
    case 2:
      if (this.center.clientWidth != this.canvas.offsetWidth){
        var ow = (this.p_width == this.canvas.clientWidth) ? this.canvas.offsetWidth : eval(this.p_width)+18; // fix for ie
        this.fx.resizeCenter.start({width: ow, marginLeft: -ow/2});
        break;
      }
      this.step++;
    case 3:
      this.bottomContainer.setStyles({top: (this.top + this.center.clientHeight)+'px', height:'0px', marginLeft: this.center.style.marginLeft, width:this.center.style.width, display: ''});
      this.fx.image.start(1);
      break;
    case 4:
      if (this.options.animateCaption){
        // This is not smooth animation in IE 6 with XML prolog.
        // If your site is XHTML strict with XML prolog, disable this option.
        this.fx.bottom.start(0,this.bottom.offsetHeight+10);
        break;
      }
      this.bottomContainer.style.height = (this.bottom.offsetHeight+10)+'px';
    case 5:
      if (this.activeItem){
        this.prevLink.style.display = '';
      }
      if (this.activeItem != (this.items.length - 1)){
        this.nextLink.style.display = '';
      }
      this.step = 0;
    }
  },

  close: function(){
    if (this.step < 0) return;
    this.step = -1;
    this.removeCurrentItem(); // discard content
    for (var f in this.fx) this.fx[f].stop();
    this.center.style.display = this.bottomContainer.style.display = 'none';
    this.fx.overlay.chain(this.setup.pass(false, this)).start(0);
    return false;
  },

  removeCurrentItem: function(){
    if (this.preload){
      if( this.preload.datatype == 'image' ) {
        $('lbImage').remove();
        this.preload.onload = Class.empty;
      }else{
        $(this.iframeId).remove();
      }
      this.preload = null;
    }
  },

  matchOrDefault: function(str, re, val){
    var hasQuery = str.match(re);
    return hasQuery ? hasQuery[1] : val;
  }

};

window.addEvent('domready', Lightbox.init.bind(Lightbox));