var ZoomBox = new Class({

  Implements: Options,
  
  Binds: ['open', 'close', 'zoomIn', 'showImage', 'prev', 'next'],

  options: {
    topOffset: 65,
    initWidth: 350,
    initHeight: 350,
    overlayOpacity: 0.8
  },

  initialize: function(options) {
    this.setOptions(options);
    this.current_image = 0;
    this.current_gallery = 0;
    this.galleries = [];
    this.box = null;
    this.overlay = null;
    this.formtags = [];
    
    this.scrollTop = window.getScroll().y;
    
    this.families = [];
    this.zoombox_a = [];
    
    this.collect();
  },
  
  collect: function() {
    var families = this.families;
    var zoombox_a = [];

    $$('a').each(function(a) {
      // test 'zoombox' and link extension, and collect all zoombox links
      if (a.rel && a.rel.test(/^zoombox/i) && a.href.split('?')[0].test(/\.(gif|jpg|png)$/i)) {
        if (a.rel.length > 7 && !families.contains(a.rel)) families.push(a.rel);
        if (!this.zoombox_a.contains(a)) zoombox_a.push(a);
      }
    }, this);
    
    this.families = families;
    this.zoombox_a = zoombox_a;
    
    // create an array of arrays with all galleries
    zoombox_a.each(function(a) {
      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)]);
      }
      a.addEvent('click', this.open.bindWithEvent(this, a));
    }, this);
  },
  
  open: function(event, a) {
    if (!a) {
      a = event;
    } else {
      event.stop();
    }
    
    this.galleries.each(function(gallery, idx) {
      var i = gallery.indexOf(a);
      if (i != -1) {
        this.current_gallery = idx;
        this.current_image = i;
      }
    }.bind(this));
    
    this.build();

    this.formtags = $$('select', 'textarea');
    if (this.formtags.length != 0) this.formtags.setStyle('display', 'none');

    this.scrollTop = window.getScroll().y;

    var wsize = window.getSize();
    this.box.setStyles({
      'left': (wsize.x - this.options.initWidth) / 2,
      'top': this.scrollTop + (wsize.y - this.options.initHeight) / 2,
      'width': this.options.initWidth,
      'height': this.options.initHeight
    });
    this.image_box.setStyles({
      'width': this.options.initWidth,
      'height': this.options.initHeight
    });

    this.prev_img.setStyle('opacity', 0);
    this.prev_btn.setStyle('display', 'none');
    this.next_img.setStyle('opacity', 0);
    this.next_btn.setStyle('display', 'none');
    //this.close_btn.setStyle('opacity', 0);

    this.overlay.setStyles({
      'display': 'block',
      'opacity': 0
    });
    this.overlay.set('tween', {}).tween('opacity', this.options.overlayOpacity).pin();
    
    this.load(a.href);
    
    $(document.body).addEvent('keyescape', this.close);
  },

  load: function(url) {
    this.image_box.setStyle('visibility', 'hidden').setStyle('opacity', 0.01);
    this.box.setStyle('display', 'block');
    
    this.prev_img.tween('opacity', 0);
    this.prev_btn.setStyle('display', 'none');
    this.next_img.tween('opacity', 0);
    this.next_btn.setStyle('display', 'none');
    //this.close_btn.tween('opacity', 0);
    this.image_box.tween('opacity', 0);
    this.box.addClass('zb-loading').set('tween', {
      onComplete: function() {
        this.prepareLoad(url);
      }.bind(this)
    }).tween('opacity', 1);
  },
  
  close: function() {
    this.box.set('tween', {
      duration: 300,
      onComplete: function() {
        this.box.setStyle('display', 'none');
      }.bind(this)
    }).tween('opacity', 0);

    this.overlay.unpin().set('tween', {
      onComplete: function() {
        this.overlay.setStyle('display', 'none');
      }.bind(this)
    }).tween('opacity', 0);
    
    $(document.body).removeEvent('keyescape', this.close);
    
    if (this.formtags.length != 0) this.formtags.setStyle('display', '');
  },

  prepareLoad: function(url) {
    this.image.src = url;
  },
 
  build: function() {
    if (this.box) return;
    
    if (!this.overlay) {
      this.overlay = new Element('div').
        setStyle('display', 'none').
        addClass('overlay').
        injectInside(document.body).
        setStyle('cursor', 'pointer').
        addEvent('click', this.close);
    }

    this.box = new Element('div').addClass('zoombox').injectInside(document.body).adopt(
      this.image_box = new Element('div', {'align': 'center'}).setStyle('overflow', 'hidden').adopt(
        this.image = new Element('img').addEvent('load', this.zoomIn)
      ),
      this.prev_img = new Element('div').addClass('prev_btn').setStyle('opacity', 0),
      this.next_img = new Element('div').addClass('next_btn').setStyle('opacity', 0),
      this.prev_btn = new Element('div').addClass('prev_zone').setStyle('display', 'none').addEvent('click', this.prev).set('html', ' '),
      this.next_btn = new Element('div').addClass('next_zone').setStyle('display', 'none').addEvent('click', this.next).set('html', ' '),
      this.close_btn = new Element('div').addClass('close_btn')./*setStyle('opacity', 0).*/addEvent('click', this.close).set('html', ' ')
    ).setStyles({
      'position': 'absolute',
      'display': 'block',
      'opacity': 0
    });
    
    this.box_fx = new Fx.Morph(this.box, {duration: 200}).addEvent('onComplete', this.showImage);
    this.image_box_fx = new Fx.Morph(this.image_box, {duration: 200}).addEvent('onComplete', this.showImage);
  },
  
  zoomIn: function() {
    this.box.removeClass('zb-loading');
    
    var wsize = window.getSize();
    var width = this.image.width + this.image.getStyle('margin-left').toInt() + this.image.getStyle('margin-right').toInt();
    var height = this.image.height + this.image.getStyle('margin-top').toInt() + this.image.getStyle('margin-bottom').toInt();
    
    // zoom
    var y = this.scrollTop + (wsize.y - height) / 2;
    if (y < this.options.topOffset) y = this.options.topOffset;
    this.box_fx.start({
      'left': (wsize.x - width) / 2,
      'top': y,
      'width': width,
      'height': height
    });
    this.image_box_fx.start({
      'width': width,
      'height': height
    });
    
    if (this.current_image > 0) {
      this.prev_img.tween('opacity', 1);
      this.prev_btn.setStyle('display', 'block');
    }
    if (this.current_image < (this.galleries[this.current_gallery].length - 1)) {
      this.next_img.tween('opacity', 1);
      this.next_btn.setStyle('display', 'block');
    }
    this.close_btn.tween('opacity', 1);
  },
  
  showImage: function() {
    this.image_box.setStyles({
      'visibility': 'visible',
      'opacity': 0
    }).tween('opacity', 1);
  },
  
  prev: function() {
    if (this.current_image <= 0) return;
    this.current_image--;
    try {
      this.load(this.galleries[this.current_gallery][this.current_image].href);
    } catch(e) {
      if (console) console.log(e);
    }
  },
  
  next: function() {
    if (this.current_image >= this.galleries[this.current_gallery].length) return;
    this.current_image++;
    try {
      this.load(this.galleries[this.current_gallery][this.current_image].href);
    } catch(e) {
      if (console) console.log(e);
    }
  }
  
});

var zoombox;
window.addEvent('domready', function() {
  zoombox = new ZoomBox();  
});