var gfeedfetcher_loading_image="images/indicator.gif"

google.load("feeds", "1")

function gfeedfetcher(divid, divClass, linktarget){
	this.linktarget=linktarget || ""
	this.feedlabels=[]
	this.feedurls=[]
	this.feeds=[]
	this.feedsfetched=0
	this.feedlimit=5
	this.showoptions="" 
	this.sortstring="date"
	document.write('<div id="'+divid+'" class="'+divClass+'"></div>')
	this.feedcontainer=document.getElementById(divid)
	this.itemcontainer="<li>"
}

gfeedfetcher.prototype.addFeed=function(label, url){
	this.feedlabels[this.feedlabels.length]=label
	this.feedurls[this.feedurls.length]=url
}

gfeedfetcher.prototype.filterfeed=function(feedlimit, sortstr){
	this.feedlimit=feedlimit
	if (typeof sortstr!="undefined")
	this.sortstring=sortstr
}

gfeedfetcher.prototype.displayoptions=function(parts){
	this.showoptions=parts
}

gfeedfetcher.prototype.setentrycontainer=function(containerstr){
this.itemcontainer="<"+containerstr.toLowerCase()+">"
}

gfeedfetcher.prototype.init=function(){
	this.feedsfetched=0
	this.feeds=[]
	this.feedcontainer.innerHTML='<img src="'+gfeedfetcher_loading_image+'" /> Retrieving RSS feed(s)'
	var displayer=this
	for (var i=0; i<this.feedurls.length; i++){
		var feedpointer=new google.feeds.Feed(this.feedurls[i])
		var items_to_show=(this.feedlimit<=this.feedurls.length)? 1 : Math.floor(this.feedlimit/this.feedurls.length)
		if (this.feedlimit%this.feedurls.length>0 && this.feedlimit>this.feedurls.length && i==this.feedurls.length-1)
			items_to_show+=(this.feedlimit%this.feedurls.length)
		feedpointer.setNumEntries(items_to_show)
		feedpointer.load(function(r){displayer._fetch_data_as_array(r)})
	}
}


gfeedfetcher._formatdate=function(datestr, showoptions){
	var itemdate=new Date(datestr)
	var parseddate=(showoptions.indexOf("datetime")!=-1)? itemdate.toLocaleString() : (showoptions.indexOf("date")!=-1)? itemdate.toLocaleDateString() : (showoptions.indexOf("time")!=-1)? itemdate.toLocaleTimeString() : ""
	return "<span class='datefield'>"+parseddate+"</span>"
}

gfeedfetcher._sortarray=function(arr, sortstr){
	var sortstr=(sortstr=="label")? "ddlabel" : sortstr
	if (sortstr=="title" || sortstr=="ddlabel"){
		arr.sort(function(a,b){
		var fielda=a[sortstr].toLowerCase()
		var fieldb=b[sortstr].toLowerCase()
		return (fielda<fieldb)? -1 : (fielda>fieldb)? 1 : 0
		})
	}
	else{
		try{
			arr.sort(function(a,b){return new Date(b.publishedDate)-new Date(a.publishedDate)})
		}
		catch(err){}
	}
}

gfeedfetcher.prototype._fetch_data_as_array=function(result){
	var thisfeed=(!result.error)? result.feed.entries : ""
	if (thisfeed=="")
		alert("Google Feed API Error: "+result.error.message)
	for (var i=0; i<thisfeed.length; i++) 
		result.feed.entries[i].ddlabel=this.feedlabels[this.feedsfetched]
	this.feeds=this.feeds.concat(thisfeed)
	this._signaldownloadcomplete()
}

gfeedfetcher.prototype._signaldownloadcomplete=function(){
	this.feedsfetched+=1
	if (this.feedsfetched==this.feedurls.length)
		this._displayresult(this.feeds)
}


gfeedfetcher.prototype._displayresult=function(feeds){
	var rssoutput=(this.itemcontainer=="<li>")? "<ul>\n" : ""
	gfeedfetcher._sortarray(feeds, this.sortstring)
	for (var i=0; i<feeds.length; i++){
		var itemtitle="<a href=\"" + feeds[i].link + "\" target=\"" + this.linktarget + "\" class=\"titlefield\">" + feeds[i].title + "</a>"
		var itemlabel=/label/i.test(this.showoptions)? '<span class="labelfield">['+this.feeds[i].ddlabel+']</span>' : " "
		var itemdate=gfeedfetcher._formatdate(feeds[i].publishedDate, this.showoptions)
		var itemdescription=/description/i.test(this.showoptions)? "<br />"+feeds[i].content : /snippet/i.test(this.showoptions)? "<br />"+feeds[i].contentSnippet  : ""
		rssoutput+=this.itemcontainer + itemtitle + " " + itemlabel + " " + itemdate + "\n" + itemdescription + this.itemcontainer.replace("<", "</") + "\n\n"
	}
	rssoutput+=(this.itemcontainer=="<li>")? "</ul>" : ""
	this.feedcontainer.innerHTML=rssoutput
}