//Step Carousel Viewer: By Dynamic Drive, at http://www.dynamicdrive.com
//** Created: March 19th, 08'
//** Aug 16th, 08'- Updated to v 1.4:
//1) Adds ability to set speed/duration of panel animation (in milliseconds)
//2) Adds persistence support, so the last viewed panel is recalled when viewer returns within same browser session
//3) Adds ability to specify whether panels should stop at the very last and first panel, or wrap around and start all over again
//4) Adds option to specify two navigational image links positioned to the left and right of the Carousel Viewer to move the panels back and forth

//** Aug 27th, 08'- Nav buttons (if enabled) also repositions themselves now if window is resized

//** Sept 23rd, 08'- Updated to v 1.6:
//1) Carousel now stops at the very last visible panel, instead of the last panel itself. In other words, no more white space at the end.
//2) Adds ability for Carousel to auto rotate dictated by the new parameter: autostep: {enable:true, moveby:1, pause:3000}
//2i) During Auto Rotate, Carousel pauses onMouseover, resumes onMouseout. Clicking Carousel halts auto rotate.

//** Oct 22nd, 08'- Updated to v 1.6.1, which fixes functions stepBy() and stepTo() not stopping auto stepping of Carousel when called.

var stepcarousel={
 ajaxloadingmsg: '<div style="margin: 1em; font-weight: bold"><img src="ajaxloadr.gif" style="vertical-align: middle" /> Fetching Content. Please wait...</div>', //customize HTML to show while fetching Ajax content
 defaultbuttonsfade: 0.4, //Fade degree for disabled nav buttons (0=completely transparent, 1=completely opaque)
 configholder: {},

 getCSSValue:function(val){ //Returns either 0 (if val contains 'auto') or val as an integer
  return (val=="auto")? 0 : parseInt(val)
 },

 getremotepanels:function($, config){ //function to fetch external page containing the panel DIVs
  config.$belt.html(this.ajaxloadingmsg)
  $.ajax({
   url: config.contenttype[1], //path to external content
   async: true,
   error:function(ajaxrequest){
    config.$belt.html('Error fetching content.<br />Server Response: '+ajaxrequest.responseText)
   },
   success:function(content){
    config.$belt.html(content)
    config.$panels=config.$gallery.find('.'+config.panelclass)
    stepcarousel.alignpanels($, config)
   }
  })
 },

 getoffset:function(what, offsettype){
  return (what.offsetParent)? what[offsettype]+this.getoffset(what.offsetParent, offsettype) : what[offsettype]
 },

 getCookie:function(Name){
  var re=new RegExp(Name+"=[^;]+", "i"); //construct RE to search for target name/value pair
  if (document.cookie.match(re)) //if cookie found
   return document.cookie.match(re)[0].split("=")[1] //return its value
  return null
 },

 setCookie:function(name, value){
  document.cookie = name+"="+value
 },

 fadebuttons:function(config, currentpanel){
  config.$leftnavbutton.fadeTo('fast', currentpanel==0? this.defaultbuttonsfade : 1)
  config.$rightnavbutton.fadeTo('fast', currentpanel==config.lastvisiblepanel? this.defaultbuttonsfade : 1)
 },

 addnavbuttons:function(config, currentpanel){
  config.$leftnavbutton=$('<img id = bleft src="'+config.defaultbuttons.leftnav[0]+'">').css({
   zIndex:50,
   position:'absolute',
   left:config.offsets.left+config.defaultbuttons.leftnav[1]+'px',
   top:config.offsets.top+config.defaultbuttons.leftnav[2]+'px',
   cursor:'hand',
   cursor:'pointer'
  }).attr({
   title:'Back '+config.defaultbuttons.moveby+' panels'
  }).appendTo('body')
  config.$rightnavbutton=$('<img id = brigh src="'+config.defaultbuttons.rightnav[0]+'">').css({
   zIndex:50,
   position:'absolute',
   left:config.offsets.left+config.$gallery.get(0).offsetWidth+config.defaultbuttons.rightnav[1]+'px',
   top:config.offsets.top+config.defaultbuttons.rightnav[2]+'px',
   cursor:'hand',
   cursor:'pointer'
  }).attr({
   title:'Forward '+config.defaultbuttons.moveby+' panels'
  }).appendTo('body')
  config.$leftnavbutton.bind('click', function(){ //assign nav button event handlers
   stepcarousel.stepBy(config.galleryid, -config.defaultbuttons.moveby)
  })
  config.$rightnavbutton.bind('click', function(){ //assign nav button event handlers
   stepcarousel.stepBy(config.galleryid, config.defaultbuttons.moveby)
  })
  if (config.panelbehavior.wraparound==false){ //if carousel viewer should stop at first or last panel (instead of wrap back or forth)
   this.fadebuttons(config, currentpanel)
  }
  return config.$leftnavbutton.add(config.$rightnavbutton)
 },

 stopautostep:function(config){
  clearTimeout(config.steptimer)
  clearTimeout(config.resumeautostep)
 },

 alignpanels:function($, config){
  var paneloffset=0
  config.paneloffsets=[paneloffset] //array to store upper left offset of each panel (1st element=0)
  config.panelwidths=[] //array to store widths of each panel
  config.$panels.each(function(index){ //loop through panels
   var $currentpanel=$(this)
   $currentpanel.css({
    float: 'none',
    position: 'absolute',
    left: paneloffset+'px'
   }) //position panel
   $currentpanel.bind('click', function(e)
   {
    //alert(config.imagenid);
    return config.onpanelclick(e.target)
   }) //bind onpanelclick() to onclick event
   paneloffset+=stepcarousel.getCSSValue($currentpanel.css('marginRight')) + parseInt($currentpanel.get(0).offsetWidth || $currentpanel.css('width')) //calculate next panel offset
   config.paneloffsets.push(paneloffset) //remember this offset
   config.panelwidths.push(paneloffset-config.paneloffsets[config.paneloffsets.length-2]) //remember panel width
  })
  config.paneloffsets.pop() //delete last offset (redundant)
  var addpanelwidths=0
  var lastpanelindex=config.$panels.length-1
  config.lastvisiblepanel=lastpanelindex
  for (var i=config.$panels.length-1; i>=0; i--){
   addpanelwidths+=(i==lastpanelindex? config.panelwidths[lastpanelindex] : config.paneloffsets[i+1]-config.paneloffsets[i])
   //alert(i+'='+config.gallerywidth+'>'+addpanelwidths)
   if (config.gallerywidth>addpanelwidths){
    config.lastvisiblepanel=i //calculate index of panel that when in 1st position reveals the very last panel all at once based on gallery width
   }
  }
  //alert(config.lastvisiblepanel)
    if($.browser.msie)
     {
       config.lastvisiblepanel = config.lastvisiblepanel - 1
     }
  config.$belt.css({
   width: paneloffset+'px'
  }) //Set Belt DIV to total panels' widths
  config.currentpanel=(config.panelbehavior.persist)? parseInt(this.getCookie(window[config.galleryid+"persist"])) : 0 //determine 1st panel to show by default
  config.currentpanel=(typeof config.currentpanel=="number" && config.currentpanel<config.$panels.length)? config.currentpanel : 0
  if (config.currentpanel!=0){
   var endpoint=config.paneloffsets[config.currentpanel]+(config.currentpanel==0? 0 : config.beltoffset)
   config.$belt.css({
    left: -endpoint+'px'
   })
  }
  if (config.defaultbuttons.enable==true){ //if enable default back/forth nav buttons
   var $navbuttons=this.addnavbuttons(config, config.currentpanel)
   $(window).bind("load resize", function(){ //refresh position of nav buttons when page loads/resizes, in case offsets weren't available document.oncontentload
    config.offsets={
     left:stepcarousel.getoffset(config.$gallery.get(0), "offsetLeft"),
     top:stepcarousel.getoffset(config.$gallery.get(0), "offsetTop")
    }
    config.$leftnavbutton.css({
     left:config.offsets.left+config.defaultbuttons.leftnav[1]+'px',
     top:config.offsets.top+config.defaultbuttons.leftnav[2]+'px'
    })
    config.$rightnavbutton.css({
     left:config.offsets.left+config.$gallery.get(0).offsetWidth+config.defaultbuttons.rightnav[1]+'px',
     top:config.offsets.top+config.defaultbuttons.rightnav[2]+'px'
    })
   })
  }
  if (config.autostep && config.autostep.enable){ //enable auto stepping of Carousel?
   var $carouselparts=config.$gallery.add(typeof $navbuttons!="undefined"? $navbuttons : null)
   $carouselparts.bind('click', function(){
    stepcarousel.stopautostep(config)
    config.autostep.status="stopped"
   })
   $carouselparts.hover(function(){ //onMouseover
    stepcarousel.stopautostep(config)
    config.autostep.hoverstate="over"
   }, function(){ //onMouseout
    if (config.steptimer && config.autostep.hoverstate=="over" && config.autostep.status!="stopped"){
     config.resumeautostep=setTimeout(function(){
      stepcarousel.autorotate(config.galleryid)
      config.autostep.hoverstate="out"
     }, 500)
    }
   })
   config.steptimer=setTimeout(function(){
    stepcarousel.autorotate(config.galleryid)
   }, config.autostep.pause) //automatically rotate Carousel Viewer
  } //end enable auto stepping check
  this.statusreport(config.galleryid)
  config.oninit()
  config.onslideaction(this)
 },

 stepTo:function(galleryid, pindex){ /*User entered pindex starts at 1 for intuitiveness. Internally pindex still starts at 0 */
  var config=stepcarousel.configholder[galleryid]
  if (typeof config=="undefined"){
   alert("There's an error with your set up of Carousel Viewer \""+galleryid+ "\"!")
   return
  }
  stepcarousel.stopautostep(config)
  var pindex=Math.min(pindex-1, config.paneloffsets.length-1)
  var endpoint=config.paneloffsets[pindex]+(pindex==0? 0 : config.beltoffset)
  if (config.panelbehavior.wraparound==false && config.defaultbuttons.enable==true){ //if carousel viewer should stop at first or last panel (instead of wrap back or forth)
   this.fadebuttons(config, pindex)
  }
  config.$belt.animate({
   left: -endpoint+'px'
  }, config.panelbehavior.speed, function(){
   config.onslideaction(this)
  })
  config.currentpanel=pindex
  this.statusreport(galleryid)
 },

 stepBy:function(galleryid, steps){ //isauto if defined indicates stepBy() is being called automatically
  var config=stepcarousel.configholder[galleryid]
  if (typeof config=="undefined"){
   alert("There's an error with your set up of Carousel Viewer \""+galleryid+ "\"!")
   return
  }
  stepcarousel.stopautostep(config)
  var direction=(steps>0)? 'forward' : 'back' //If "steps" is negative, that means backwards
  var pindex=config.currentpanel+steps //index of panel to stop at
  if (config.panelbehavior.wraparound==false)
  { //if carousel viewer should stop at first or last panel (instead of wrap back or forth)
   pindex=(direction=="back" && pindex<=0)? 0 : (direction=="forward")? Math.min(pindex, config.lastvisiblepanel) : pindex
   if (config.defaultbuttons.enable==true)
   { //if default nav buttons are enabled, fade them in and out depending on if at start or end of carousel
    stepcarousel.fadebuttons(config, pindex)
   }
  }
  else
  { //else, for normal stepBy behavior
   //alert(pindex +">"+ config.lastvisiblepanel +"&&"+ direction +"==forward")
   if (pindex>config.lastvisiblepanel && direction=="forward")
   {
    //if destination pindex is greater than last visible panel, yet we're currently not at the end of the carousel yet
    pindex=(config.currentpanel<config.lastvisiblepanel)? config.lastvisiblepanel : 0
    //alert('2:1:'+pindex+'='+'('+config.currentpanel+'<'+config.lastvisiblepanel+')?'+config.lastvisiblepanel+': 0')
   }
   else if (pindex<0 && direction=="back"){
    //if destination pindex is less than 0, yet we're currently not at the beginning of the carousel yet
    pindex=(config.currentpanel>0)? 0 : config.lastvisiblepanel /*wrap around left*/
   }
  }
  var endpoint=config.paneloffsets[pindex]+(pindex==0? 0 : config.beltoffset) //left distance for Belt DIV to travel to
  //BUG DE AVANCE DE CANTIDAD DE RECORRIDO
  //alert($.browser.msie+'<=>'+config.paneloffsets[pindex]+':'+pindex+':'+config.beltoffset)
  if (pindex==0 && direction=='forward' || config.currentpanel==0 && direction=='back' && config.panelbehavior.wraparound==true){ //decide whether to apply "push pull" effect
   config.$belt.animate({
    left: -config.paneloffsets[config.currentpanel]-(direction=='forward'? 100 : -30)+'px'
   }, 'normal', function(){
    config.$belt.animate({
     left: -endpoint+'px'
    }, config.panelbehavior.speed, function(){
     config.onslideaction(this)
    })
   })
  }
  else
   config.$belt.animate({
    left: -endpoint+'px'
   }, config.panelbehavior.speed, function(){
    config.onslideaction(this)
   })

   //alert(pindex); //CANTIDAD DE CELDAS A CAMBIAR
   //alert(endpoint); //CANTIDAD DE PICXEL A RECORRER
  config.currentpanel=pindex
  this.statusreport(galleryid)
 },

 autorotate:function(galleryid){
  var config=stepcarousel.configholder[galleryid]
  if (config.$gallery.attr('_ismouseover')!="yes"){
   this.stepBy(galleryid, config.autostep.moveby)
  }
  config.steptimer=setTimeout(function(){
   stepcarousel.autorotate(galleryid)
  }, config.autostep.pause)
 },

 statusreport:function(galleryid){
  var config=stepcarousel.configholder[galleryid]
  var startpoint=config.currentpanel //index of first visible panel
  var visiblewidth=0
  for (var endpoint=startpoint; endpoint<config.paneloffsets.length; endpoint++){ //index (endpoint) of last visible panel
   visiblewidth+=config.panelwidths[endpoint]
   if (visiblewidth>config.gallerywidth){
    break
   }
  }
  startpoint+=1 //format startpoint for user friendiness
  endpoint=(endpoint+1==startpoint)? startpoint : endpoint //If only one image visible on the screen and partially hidden, set endpoint to startpoint
  var valuearray=[startpoint, endpoint, config.panelwidths.length]
  for (var i=0; i<config.statusvars.length; i++){
   window[config.statusvars[i]]=valuearray[i] //Define variable (with user specified name) and set to one of the status values
   config.$statusobjs[i].text(valuearray[i]+" ") //Populate element on page with ID="user specified name" with one of the status values
  }
 },

 setup:function(config){
  //Disable Step Gallery scrollbars ASAP dynamically (enabled for sake of users with JS disabled)
  document.write('<style type="text/css">\n#'+config.galleryid+'{overflow: hidden;}\n</style>')
  jQuery(document).ready(function($){
   config.$gallery=$('#'+config.galleryid)
   config.gallerywidth=config.$gallery.width()
  // alert(config.gallerywidth)
   config.offsets={
    left:stepcarousel.getoffset(config.$gallery.get(0), "offsetLeft"),
    top:stepcarousel.getoffset(config.$gallery.get(0), "offsetTop")
   }
   config.$belt=config.$gallery.find('.'+config.beltclass) //Find Belt DIV that contains all the panels
   config.$panels=config.$gallery.find('.'+config.panelclass) //Find Panel DIVs that each contain a slide
   config.panelbehavior.wraparound=(config.autostep && config.autostep.enable)? true : config.panelbehavior.wraparound //if auto step enabled, set "wraparound" to true
   config.onpanelclick=(typeof config.onpanelclick=="undefined")? function(target){} : config.onpanelclick //attach custom "onpanelclick" event handler
   config.onslideaction=(typeof config.onslide=="undefined")? function(){} : function(beltobj){
    $(beltobj).stop(); config.onslide()
   } //attach custom "onslide" event handler
   config.oninit=(typeof config.oninit=="undefined")? function(){} : config.oninit //attach custom "oninit" event handler
   config.beltoffset=stepcarousel.getCSSValue(config.$belt.css('marginLeft')) //Find length of Belt DIV's left margin
   config.statusvars=config.statusvars || []  //get variable names that will hold "start", "end", and "total" slides info
   config.$statusobjs=[$('#'+config.statusvars[0]), $('#'+config.statusvars[1]), $('#'+config.statusvars[2])]
   config.currentpanel=0
   stepcarousel.configholder[config.galleryid]=config //store config parameter as a variable
   if (config.contenttype[0]=="ajax" && typeof config.contenttype[1]!="undefined") //fetch ajax content?
    stepcarousel.getremotepanels($, config)
   else
    stepcarousel.alignpanels($, config) //align panels and initialize gallery
  }) //end document.ready
  jQuery(window).bind('unload', function(){ //clean up
   if (config.panelbehavior.persist){
    stepcarousel.setCookie(window[config.galleryid+"persist"], config.currentpanel)
   }
   jQuery.each(config, function(ai, oi){
    oi=null
   })
   config=null
  })
 }
}