var lastAction = "down";
var id = 1;
var times = 0;
var total = 0;

var loop = 5;
var startNum = 0;
var the_cookie = document.cookie;
var broken_cookie = the_cookie.split(";");
if(broken_cookie.length > 1){
  for(i=0;i<broken_cookie.length;i++){
	var cookieName = broken_cookie[i].split("=")[0];
	if(cookieName == "clsViewer"){
		var tempNum = parseInt(broken_cookie[i].split("=")[1]);
		if(typeof(tempNum)!="undefined"){
		  startNum = tempNum;
		  id = startNum+1;
		  loop = startNum+5;
		}
	}
  }
}else if(broken_cookie.length == 1){
  var cookieName = broken_cookie[0].split("=")[0];
  if(cookieName == "clsViewer"){
	var tempNum = parseInt(broken_cookie[0].split("=")[1]);
	if(typeof(tempNum)!="undefined"){
	  startNum = tempNum;
	  id = startNum+1;
	  loop = startNum+5;
	}
  }
}

var jsonData = new Array();
function getAlbumDiv(url,where) { // get data from source (what)
 var xmlhttp = CreateHTTPObject();
 if (!xmlhttp)   return false;
 document.getElementById(where).innerHTML ="<img src='/babypeer/images/loader.gif'>";
 xmlhttp.onreadystatechange = function (){
   triggerAlbum(xmlhttp,where);
 } 
 xmlhttp.open("GET", url,true);
 xmlhttp.send(null); 
}
function triggerAlbum(xmlhttp,where){
  if (xmlhttp.readyState == 4){
        if (xmlhttp.status == 200 && xmlhttp.responseText){
            document.getElementById(where).innerHTML = xmlhttp.responseText;
            getList();
        }else{
            alert("error ! code = " + xmlhttp.status);
        }
  }
}

function getList(){
	var albumNo = document.getElementById('albumNo').value;
	var clsNo = document.getElementById('classNo').value;
	var limit = document.getElementById('limit').value;
	var content = document.getElementById('content').value;
	var url = "/babypeer/PUBLIC_MODULE/GET_IMG.php";
	var post = '';
	if(limit == 'Y')
	  post = "&limit=true";
	if(content == 'Y')
	  post += "&content=true";
	request = CreateHTTPObject();
	request.open("POST", url, true);
	request.onreadystatechange = function(){
		updatePage(request);
	}
	request.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
	request.send("from=cls&aid="+albumNo+"&cls="+clsNo+post);
}

function updatePage(request){
  if (request.readyState == 4) {
    if (request.status == 200) {
      jsonData = eval('(' + request.responseText + ')');
      var getimg = jsonData[0]; 
	  if(jsonData.length > 0){
		  total = jsonData.length;
		  //先將loading的圖示拿掉
		  document.getElementById('loading').style.display = 'none';
		  //load圖片,最多只load五張
		  if(total <=5){
			  loop = total;
		  }
		  for(i=startNum;i<loop;i++){
			times++;
			j = i+1;
			document.getElementById('img'+j).src = jsonData[i];
		  }
	  }
    }else{
      var message = request.getResponseHeader("Status");
      if ((message == null) )
        alert("Error! Request status is " + request.status);
      else
        alert(message);
    }
  }
}

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)
			}
		})
	},
//take off by Atsung//
	/*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 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 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
			$currentpanel.bind('click', function(e){return config.onpanelclick(e.target)}) //bind onpanelclick() to onclick event
			paneloffset+=stepcarousel.getCSSValue($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.$panels.length-1; i>=0; i--){
			addpanelwidths+=(i==lastpanelindex? config.panelwidths[lastpanelindex] : config.paneloffsets[i+1]-config.paneloffsets[i])
			if (config.gallerywidth>addpanelwidths){
				config.lastvisiblepanel=i //calculate index of panel that when in 1st position reveals the very last panel all at once based on gallery width
			}
		}
		config.$belt.css({width: paneloffset+'px'}) //Set Belt DIV to total panels' widths
		config.currentpanel=(config.panelbehavior.persist)? parseInt(startNum) : 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.$gallery.get(0), "offsetTop")}//take off by Atsung//
				config.$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)
	},
    //**** 2009/04/08  by Atsung ****//
	stepBy:function(galleryid,steps){ //isauto if defined indicates stepBy() is being called automatically
	  if(total > 0){
		var stepLoop;
	    var endLoop;
		if(times <= total){  //如果每張圖都跑出來過的話怎則不跑圖,以免多此一舉
			if(steps > 0){
			  if(lastAction == "down"){
				 id = id+4;
			  }
			  lastAction = "up";
			  id++;
			  if(id > total){
				id = 1; 
				if(total > 5){
					endLoop = 5;
				}else{
					endLoop = total;
				}
				for(i=1;i<=endLoop;i++){
					if(document.getElementById('img'+i).src.search("#") != -1){
						times++;
						document.getElementById('img'+i).src = jsonData[i-1];
					}

			    }
				lastAction = "down";
			  }else{
				 //還沒讀取圖片的才能讀取,避免重工
				 if(document.getElementById('img'+id).src.search("#") != -1){
				   times++;
				   document.getElementById('img'+id).src = jsonData[id-1];
				 }
			  }
			}else{
			  if(lastAction == "up"){
				id = id-4;
			  }
			  lastAction = "down";
			  id--;
			  if(id <= 0){
			    id = total;
				if(total-5 < 5){
					stepLoop = total-5;
				}else{
					stepLoop = 5 ;
				}
				for(i=total-stepLoop;i<=total;i++){
					if(document.getElementById('img'+i).src.search("#") != -1){
						times++;
						document.getElementById('img'+i).src = jsonData[i-1];
					}
					id = i-4;  //每張圖的id
			    }
			   }else{
				 if(document.getElementById('img'+id).src.search("#") != -1){
						times++;
						document.getElementById('img'+id).src = jsonData[id-1];
				 }
			   }
			}
		}
	  }//stepBy End
		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
			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
			}
			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
		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)})
		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()
			//config.offsets={left:stepcarousel.getoffset(config.$gallery.get(0), "offsetLeft"), top:stepcarousel.getoffset(config.$gallery.get(0), "offsetTop")}//take off by Atsung//
			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("clsViewer", config.currentpanel)
			}//window[config.galleryid+"persist"]
			jQuery.each(config, function(ai, oi){
				oi=null
			})
			config=null
		})
	}
}