/*
** Photo Slider 1.0 08/08/07
**  Author: Jesse Janzer
**   jjanzer@lanthera.net http://jjanzer.subculture.org
**  Tutorial Site: http://opiefoto.com/articles/slider
**
** You may use this library for any purpose.
**
** If you find it useful feel free to give me credit and link to
**  the original tutorial site http://opiefoto.com/articles/slider
*/

var FOTO = { };
var SKEL = { };
SKEL.EFFECTS = { };

FOTO.Slider = {
  bucket : { }, //a hash containing our thumbnails & images
  imageCache : { }, //cache of the images so the preloaded images aren't overwritten in some browsers
  loadingURL : '',
  baseURL : '',
  thumbURL : 't_{ID}.jpg',
  mainURL : '{ID}.jpg',

  duration: 3000, //how long do we look at each image?

  data : { }, //contains things like current offset, paused, etc keyed off of the slider id

  //returns the URL for our thumbnails and large images
  getUrlFromId: function(key,id,isThumb){

    //do we have this url in our bucket?
    if(this.bucket[key] != null && this.bucket[key][id] != null){
      if(isThumb && this.bucket[key][id]['thumb'] != null){
        return this.baseURL+this.bucket[key][id]['thumb'];
      } else if (!isThumb && this.bucket[key][id]['main'] != null){
      return this.baseURL+this.bucket[key][id]['main'];
      }
    }

    //we don't have it stored, so generate it
    if(isThumb)
      return this.baseURL+this.thumbURL.replace('{ID}',id);
    return this.baseURL+this.mainURL.replace('{ID}',id);
  },

  //returns the caption for the image
  getCaptionFromId: function(key,id){
    if(this.bucket[key] != null && this.bucket[key][id] != null){
      return this.bucket[key][id]['caption'];
    }
  },

  //ids is just an array
  importBucketFromIds: function(key,ids){
    this.bucket[key] = new Object(); //replace any existing entries with this new set
    for(i in ids){
      this.bucket[key][ids[i]] = new Object(); //there isn't any reason to pre-store the urls for this
      //this.bucket[i]['thumb'] = this.getUrlFromId(i,true);
      //this.bucket[i]['main'] = this.getUrlFromId(i,false);
    }
  },

  buildThumbBar: function(key,bar){
    if(this.bucket[key] == null){
      return false;
    }

    var slot = 0;

    for(i in this.bucket[key]){
      var div = $(document.createElement('div'));
      div.attr('imageid',i);
      div.attr('slot',slot++);
      div.addClass('photoslider_thumb');

      var div1 = $(document.createElement('div'));
      div1.addClass('outer');
      
      var div2 = $(document.createElement('div'));
      div2.addClass('container');

      var nspan = $(document.createElement('span'));
      var div3 = $(document.createElement('div'));
      div3.addClass('auxiliary');

      var img = document.createElement('img');
      img.src = this.getUrlFromId(key,i,true);

      //attach the image to the div
//      div.append(img);
      div2.append(nspan);
      div2.append(img);

      div1.append(div2);
      div1.append(div3);

      div.append(div1);

      //attach the div to our thumbnail bar
      $(bar).append(div);

      //calc the width (needed for later)
      /*this.data[key]['thumbWidth'] =
        parseInt(div.css('width'))
        +parseInt(div.css('border-left-width'))
        +parseInt(div.css('border-right-width'))
        +parseInt(div.css('margin-left'))
        +parseInt(div.css('margin-right'))
        +parseInt(div.css('padding-left'))
        +parseInt(div.css('padding-right'));*/
    }

    //we need to add a clear since we have floating divs
    var clear = document.createElement('div');
    $(clear).addClass('photoslider_clear');

    //finally we need to force the width of the bar so that the divs don't wrap to the next line
    // we give it 1 extra slot just for buffer
    $(bar).css('width',((slot+1)*this.data[key]['thumbWidth'])+'px')


    $(bar).append(clear);
  },

  //loads in the slideshow, replaces the existing one if set
  reload: function(key){
    if(this.data[key] == null){
      this.data[key] = new Object();
    }

    if ($.browser.msie) {
      if ($.browser.version  == '6.0')
        this.data[key]['thumbWidth'] = 120; // IE 7
      else 
        this.data[key]['thumbWidth'] = 110; // IE 7
    } else if ($.browser.mozilla){
      this.data[key]['thumbWidth'] = 102;
    }

    this.data[key]['paused'] = true;
    this.data[key]['currentSlot'] = 0;
    this.data[key]['currentId'] = null;

    var sliderDiv = $('#'+key);

    var sliderMain = $('#'+key+' .photoslider_main').get(0);
    if(sliderMain != null){
      $(sliderMain).remove();
    }

    sliderMain = $(document.createElement('div'));
    sliderMain.addClass('photoslider_main');

      var div1 = $(document.createElement('div'));
      div1.addClass('outer1');
      
      var div2 = $(document.createElement('div'));
      div2.addClass('container');

      var nspan = $(document.createElement('span'));
      var div3 = $(document.createElement('div'));
      div3.addClass('auxiliary');

      sliderMainImg = document.createElement('img');

      div2.append(nspan);
      div2.append(sliderMainImg);

      div1.append(div2);
      div1.append(div3);

    sliderMain.append(div1);


//    var sliderCaption = $(document.createElement('div'));
//    sliderCaption.addClass('photoslider_caption');


    var sliderNav = $('#'+key+' .photoslider_nav').get(0);
    if(sliderNav != null){
      //remove it
      $(sliderNav).remove();
    }

    sliderNav = $(document.createElement('div'));
    sliderNav.addClass('photoslider_nav');

    sliderDiv.append(sliderNav);
//    sliderDiv.append(sliderCaption);
    sliderDiv.append(sliderMain);

    thumbBar = $(document.createElement('div'));
    thumbBar.addClass('photoslider_thumbBar');

    //build the bar
    this.buildThumbBar(key,thumbBar);

    //now we need to attach our events
    $(thumbBar).children('.photoslider_thumb').each(function(){
      //what happens when we click on a thumbnail?
      $(this).click(function(ev){
        FOTO.Slider.thumbClick(ev);
      });
    });

    //attach our thumb nail bar to our parent
    sliderNav.append(thumbBar);

    //build our play/stop buttons
//    var sliderControl = $(document.createElement('div'));
//    sliderControl.addClass('photoslider_control');

    var sliderPlay = $('.photoslider_play');
//    sliderPlay.addClass('');

    var sliderStop = $('.photoslider_stop');
    //sliderStop.addClass('photoslider_stop');

//    var clear = $(document.createElement('div'));
//    clear.addClass('photoslider_clear');

//    sliderControl.append(sliderPlay).append(sliderStop).append(clear);

    //bind our click events to the buttons
    $(sliderPlay).click(function(){
      if(FOTO.Slider.data[key]['paused']){
//        $(sliderPlay).addClass('slideshow_disabled');
//        $(sliderStop).removeClass('slideshow_disabled');
        FOTO.Slider.play(key);
        sliderStop.css('display','block')
        sliderPlay.css('display','none')
      }
    });

    $(sliderStop).click(function(){
      if(!FOTO.Slider.data[key]['paused']){
//        $(sliderStop).addClass('slideshow_disabled');
//        $(sliderPlay).removeClass('slideshow_disabled');
        sliderStop.css('display','none')
        sliderPlay.css('display','block')
      }
      FOTO.Slider.stop(key);
    });

//    sliderDiv.append(sliderControl);


    //click our first element
    var firstThumb = $('#'+key+' .photoslider_thumb[slot$=0]');
    fst  = firstThumb.get(0);
    $(fst).click();
  },

  thumbClick: function(ev){
    //find our main parent
    var thumb = null;

                         
    if(ev.currentTarget){
      thumb = $(ev.currentTarget);
    } else if(ev.srcElement){
      //work around for IE's lack of currentTarget
      if( $(ev.srcElement).attr('src') == null){
        //they clicked on the div
        thumb = $(ev.srcElement);

        if (thumb.attr('className') == 'container')
          thumb = thumb.parent();
        if (thumb.attr('className') == 'auxiliary')
          thumb = thumb.parent();
        if (thumb.attr('className') == 'outer')
          thumb = thumb.parent();
      } else {
        //they clicked on the img
        thumb = $(ev.srcElement).parent();//.parent().parent();
        if (thumb.attr('className') == 'container')
          thumb = thumb.parent();
        if (thumb.attr('className') == 'auxiliary')
          thumb = thumb.parent();
        if (thumb.attr('className') == 'outer')
          thumb = thumb.parent();
      }
    } else if (ev.target) {
      thumb = $(ev.target);
    }

    var id = thumb.attr('imageid');

    var bar = $(".photoslider_thumbBar");
    var nav = bar.parent();
    var parent = nav.parent();
      
    var key = parent.attr('id');
    var slot = thumb.attr('slot');
    if(id == null){
      id = 0;
    }
    if(slot == null){
      slot = 0;
    }

    //window.alert('id '+id+' bar '+bar+' nav '+nav+' parent '+parent+' key '+key+' slot '+slot);
//    alert(parent.attr('className'));
    if(id == this.data[key]['currentId']){
      return false; //don't do anything since this is our current image
    }

    this.resetTimer(key);

    //now we have everything we need, let's load in the main image
    this.setMainImage(key,id);

    //if we already are animating stop
    if(this.data[key]['interval'])
      SKEL.EFFECTS.Slide.stopByIntervalId(this.data[key]['interval']);
    if(this.data[key]['intervalThumb'])
      SKEL.EFFECTS.Slide.stopByIntervalId(this.data[key]['intervalThumb']);

    //let's move our thumb into position
    if(this.data[key]['currentId'] != null){
      //move the thumbnail back up
      SKEL.EFFECTS.Slide.animate($('.photoslider_thumb[imageid$='+this.data[key]['currentId']+']').get(0),'top','20px','0px',500,SKEL.Transitions.quadOut);
      //NOTE: we don't want to clear this interval incase the user clicks really fast (unless we kept track of every animation)
    }

    this.data[key]['currentId'] = id;
    this.data[key]['currentSlot'] = slot;

    //animate our div down
    this.data[key]['intervalThumb'] = SKEL.EFFECTS.Slide.animate(thumb,'top','0px','20px',250,SKEL.Transitions.quadOut);

    //where are we right now?
    var currentPos = this.findRelativePos(bar.get(0));
    var navWidth = parseInt($(nav).css('width'));
    var slots = Math.floor(navWidth / this.data[key]['thumbWidth']);

    //where do we need to be?
    //we want to position the clicked on div in the dead center

    //alternative method
    //var centerStart = (-this.data[key]['thumbWidth'] * slot) + ((this.data[key]['thumbWidth'] * (slots/2)) - (this.data[key]['thumbWidth']/2));

//    alert(( (+this.data[key]['thumbWidth'] * (slot) ) + (this.data[key]['thumbWidth']/2) ));

    var centerStart = (navWidth / 2) - ( (+this.data[key]['thumbWidth'] * (slot) ) + (this.data[key]['thumbWidth']/2)) ;

    var barFrom = currentPos['x']+'px';
    var barTo = centerStart+'px';

//    window.alert('thumb '+thumb+' key'+key+' from '+barFrom+' to '+barTo+ ' navWidth '+navWidth+' thumb '+this.data[key]['thumbWidth']+' slot '+slot+' center'+centerStart);

    this.data[key]['interval'] = SKEL.EFFECTS.Slide.animate(bar,'left',barFrom,barTo,1000,SKEL.Transitions.backOut);
  },

  //preloads the image for the main viewing area
  setMainImage: function(key,id){
    var main = $('#'+key+' .photoslider_main');
    var mainImg = $('#'+key+' .photoslider_main img').get(0);

    //set the mainImg to the spinner
    //mainImg.src = this.loadingURL;

    //preload the image and on return set our image
    this.preload(this.getUrlFromId(key,id,false),FOTO.Slider.displayMainImage,{key: key, id: id});
  },

  displayMainImage: function(img){
    var newSrc = ($(this).get())[0].src;

    var args = this.args;
    var key = args['key'];
    var id = args['id'];
    var main = $('#'+key+' .photoslider_main');
    var mainImg = $('#'+key+' .photoslider_main img').get(0);
    var caption = $('.photoslider_caption');
    var captionTxt = FOTO.Slider.getCaptionFromId(key,id);

    if(captionTxt == null){
      captionTxt = ' '; //make it play nice in browsers like ie
    }
    caption.html(captionTxt);

    $(mainImg).attr('src',newSrc);
  },

  //preload an image and fire off a callback if needed
  preload: function(url,onLoadFunc,args){
    var image = document.createElement('img');
    if(onLoadFunc){
      image.onload = onLoadFunc;
    }

    if(args){
      image.args = args;
    }

    image.src = url;
    this.imageCache[url] = image;
    return image;
  },

  enableSlideshow: function(key){
    $('#'+key+' .photoslider_control').css('display','block');
    this.data[key]['slideshow'] = true;
  },

  //loops through the images available and preloads them one at a time
  preloadImages: function(key){
    //we've already started preloading "0" so start at "1"
    if(this.bucket[key] != null && this.bucket[key][1] != null){
      this.preload(this.getUrlFromId(key,1,false),FOTO.Slider.preloadImageChain,{key: key,slot: 1});
    }
  },

  preloadImageChain: function(){
    var args = this.args;
    var key = args['key'];
    var slot = parseInt(args['slot'])+1;
    if(FOTO.Slider.bucket[key] != null && FOTO.Slider.bucket[key][slot] != null){
      FOTO.Slider.preload(FOTO.Slider.getUrlFromId(key,slot,false),FOTO.Slider.preloadImageChain,{key: key,slot: slot});
    }
  },

  //returns the absolute coords based on where it is on the page (works w/ scrolled content)
  findAbsolutePos: function(el){
    var SL = 0, ST = 0;
    var is_div = /^div$/i.test(el.tagName);
    if (is_div && el.scrollLeft)
      SL = el.scrollLeft;
    if (is_div && el.scrollTop)
      ST = el.scrollTop;
    var r = { x: el.offsetLeft - SL, y: el.offsetTop - ST };
    r.width = el.offsetWidth;
    r.height = el.offsetHeight;

    if (el.offsetParent) {
      var tmp = this.findAbsolutePos(el.offsetParent);
      r.x += tmp.x;
      r.y += tmp.y;
    }
    return r;
  },

  //this is just like the findAbsolutePos, but stops if a parent's css is "position:relative;"
  findRelativePos: function(el){
    var SL = 0, ST = 0;
    var is_div = /^div$/i.test(el.tagName);
    if (is_div && el.scrollLeft)
      SL = el.scrollLeft;
    if (is_div && el.scrollTop)
      ST = el.scrollTop;
    var r = { x: el.offsetLeft - SL, y: el.offsetTop - ST };
    r.width = el.offsetWidth;
    r.height = el.offsetHeight;

    if (el.offsetParent) {
      if($(el.offsetParent).css('position') != 'relative'){
        //stop if we have a relative parent
        var tmp = this.findRelativePos(el.offsetParent);
        r.x += tmp.x;
        r.y += tmp.y;
      } else {
        r.x += 0;
        r.y += 0;
      }
    }
    return r;
  },

  cycleImage: function(key){
    var slot = parseInt(parseInt(this.data[key]['currentSlot'])+1); //force this to be a number

    var thb = $('#'+key+' .photoslider_thumb[slot$='+slot+']').get(0);
    var thumb = $(thb).get(0);
    if(thumb == null){
      //perhaps we're at the end or don't have a valid slot, try slot 0
      thumb = $('#'+key+' .photoslider_thumb[slot$=0]').get(0).get(0);
      if(thumb == null){
        //there is no slot available, return
        this.data[key]['paused'] = true;
        return false;
      }
    }
    $(thumb).click();
  },

  play: function(key){
    if(this.data[key]['paused']){
      this.data[key]['intervalCycle'] = setInterval(function(){FOTO.Slider.cycleImage(key);},FOTO.Slider.duration);
    }
    this.data[key]['paused'] = false;
  },

  stop: function(key){
    this.data[key]['paused'] = true;
    if(this.data[key]['intervalCycle']){
      clearInterval(this.data[key]['intervalCycle']);
    }
  },

  resetTimer: function(key){
    if(!this.data[key]['paused'] && this.data[key]['intervalCycle']){
      this.stop(key);
      this.play(key);
    }
  }

};


SKEL.Transitions = {

  /* Many of these functions come from Robert Penner and mootools
  **  http://www.robertpenner.com/easing/
  **  http://mootools.net
  **
  ** For more methods check
  **  http://opiefoto.com/js/skel/transitions.js
  */

  quadOut: function(t, b, c, d){
    return -c *(t/=d)*(t-2) + b;
  },

  backOut: function(t, b, c, d, s){
    if (!s) s = 1.70158;
    return c*((t=t/d-1)*t*((s+1)*t + s) + 1) + b;
  }

};


SKEL.EFFECTS.Slide = {
  counter: 0,
  fps: 50,

  //handles the animation from an attribute to an attribute
  animate: function(element,cssAttribute,from,to,duration,transition){

    if($(element).css('display') != 'block'){
      element.skel_old_display = element.css('display');
    }

    //if there isn't a default transition set one
    if(!transition){
      transition = SKEL.Transitions.quadOut;
    }

    //cancel any current animation
    SKEL.EFFECTS.Slide.stop(element);

    var startTime = new Date().getTime();

    //IE doesn't support arguments, so make a function that explicitly calls with those arguments
    element.skel_animate_id = setInterval(function(){
      SKEL.EFFECTS.Slide.step(element,cssAttribute,from,to,duration,startTime,transition);
    },(1000/SKEL.EFFECTS.Slide.fps));

    return element.skel_animate_id;
  },

  //cancels any animation event
  stop: function(element){
    //console.log(this,element,element.skel_animate_id);
    //console.log(element.skel_animate_id);
    if(element.skel_animate_id){
      clearInterval(element.skel_animate_id);
      element.skel_animate_id = 0;
      if(element.skel_old_display){
        element.css('display',element.skel_old_display);
      }
    }

  },

  //cancels any animation event
  stopByIntervalId: function(id){
    if(id){
      clearInterval(id);
    }
  },

  step: function(element,cssAttribute,from,to,duration,start,transition){
    var curTime = new Date().getTime();

    if(cssAttribute == 'color' || cssAttribute == 'background-color'){
      from = this.hexToRgb(from);
      to = this.hexToRgb(to);
    } else {
      //what we use to finalize the unit
      var result = this.splitValue(from);
      var prefix = result.prefix;
      if(prefix == '-')
        prefix = '';
      var postfix = result.postfix;

      from = parseInt(from);
      to = parseInt(to);
    }

    //compute the new property
    var newValue = SKEL.EFFECTS.Slide.compute(curTime,from,to,duration,start,transition);

    var finished = false;

    if(curTime > (start+duration)){
      finished = true;
    }
    if(cssAttribute == 'color' || cssAttribute == 'background-color'){
      newValue = this.rgbToHex(newValue);
    } else {
      newValue = prefix+Math.round(newValue)+postfix;
    }

    if(finished){
      SKEL.EFFECTS.Slide.stop(element);
    }

    //window.alert('css: '+cssAttribute+' new:'+newValue+' element: '+element);
    $(element).css(cssAttribute,newValue);
  },

  //thanks to mootools and Robert Penner
  compute: function(time,from,to,duration,startTime,transitionFunc){
    var deltaTime = time-startTime;
    if(time > (startTime + duration)){
      //we're past our point, return max
      return to;
    } else {
      if(typeof(from) == 'object'){
        //if we have an object, compute all the transitions\
        var tmpObject = Array();
        from.forEach(function(value,index){
          newFrom = value;
          newTo = to[index];
          newValue = transitionFunc(deltaTime,newFrom,(newTo-newFrom),duration);
          tmpObject[index] = Math.round(newValue);
        });
        return tmpObject;
      } else {
        return transitionFunc(deltaTime,from,(to-from),duration);
      }
    }
  },

  hexToRgb: function(str){
    var hex = str.match(/^#?(\w{1,2})(\w{1,2})(\w{1,2})$/);
    if(hex){
      if(hex[1] != ''){
        hex[1] = parseInt(hex[1],16);
        hex[2] = parseInt(hex[2],16);
        hex[3] = parseInt(hex[3],16);
      }
    }

    return (hex) ? hex.slice(1) : false;
  },

  rgbToHex: function(rgb){
    if (rgb.length < 3) return false;
    if (rgb[3] && (rgb[3] == 0) && !rgb) return 'transparent';
    var hex = [];
    for (var i = 0; i < 3; i++){
      var bit = (rgb[i]-0).toString(16);
      hex.push((bit.length == 1) ? '0'+bit : bit);
    }
    return '#'+hex.join('');
  },

  //returns prefix,postfix,value eg: #ff0000 {prefix: #, value: ff0000}, abc123efg {prefix: abc, value: 123, postfix: efg}
  splitValue: function(str){
    result = {
      prefix: '',
      postfix: '',
      value: ''
    }
    if(str != ''){
      var res = str.match(/([^0-9]*)([0-9]+)([^0-9]*)/);
      //try{
      result = {
        prefix: res[1],
        postfix: res[3],
        value: res[2]
      };
    }
    return result;

  }

}