// -------------------------------------------------------------------
// gAjax RSS Feeds Displayer- By Dynamic Drive, available at: http://www.dynamicdrive.com
// Created: July 17th, 2007 Updated: n/a
// -------------------------------------------------------------------

var gfeedfetcher_loading_image = "/Images/Icons/indicator.gif";  //Full URL to "loading" image. No need to config after this line!!

google.load("feeds", "1");  //Load Google Ajax Feed API (version 1)

function gfeedfetcher(divid, divClass, linktarget){
    this.linktarget = linktarget || "";  //link target of RSS entries
    this.feedlabels = [];  //array holding lables for each RSS feed
    this.feedurls = [];
    this.feeds = [];  //array holding combined RSS feeds' entries from Feed API (result.feed.entries)
    this.feedsfetched = 0;  //number of feeds fetched
    this.feedlimit = 5;
    this.showoptions = "";  //Optional components of RSS entry to show (none by default)
    this.sortstring = "date";  //sort by "date" by default
    document.write('<div id="' + divid + '" class="' + divClass + '"></div>');  //output div to contain RSS entries
    this.feedcontainer = document.getElementById(divid);
    this.itemcontainer = "<li>";  //default element wrapping around each RSS entry item
}

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 //set RSS entry options to show ("date, datetime, time, snippet, label, description")
}

gfeedfetcher.prototype.setentrycontainer=function(containerstr){  //set element that should wrap around each RSS entry item
this.itemcontainer="<"+containerstr.toLowerCase()+">"
}

gfeedfetcher.prototype.init = function() {
    this.feedsfetched = 0 //reset number of feeds fetched to 0 (in case init() is called more than once)
    this.feeds = [] //reset feeds[] array to empty (in case init() is called more than once)
    this.msg = this.feedcontainer.innerHTML;
    this.feedcontainer.innerHTML = '<img src="' + gfeedfetcher_loading_image + '" /> Retrieving RSS feed(s)'
    var displayer = this;
    
    for (var i = 0; i < this.feedurls.length; i++) { //loop through the specified RSS feeds' URLs
        var feedpointer = new google.feeds.Feed(this.feedurls[i]) //create new instance of Google Ajax Feed API
        var items_to_show = (this.feedlimit <= this.feedurls.length) ? 1 : Math.floor(this.feedlimit / this.feedurls.length) //Calculate # of entries to show for each RSS feed
        if (this.feedlimit % this.feedurls.length > 0 && this.feedlimit > this.feedurls.length && i == this.feedurls.length - 1) //If this is the last RSS feed, and feedlimit/feedurls.length yields a remainder
            items_to_show += (this.feedlimit % this.feedurls.length) //Add that remainder to the number of entries to show for last RSS feed
        feedpointer.setNumEntries(items_to_show) //set number of items to display
        feedpointer.load(function(r) {
            displayer._fetch_data_as_array(r)
        }) //call Feed.load() to retrieve and output RSS feed
    }
}


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 //change "label" string (if entered) to "ddlabel" instead, for internal use
	if (sortstr=="title" || sortstr=="ddlabel"){ //sort array by "title" or "ddlabel" property of RSS feed entries[]
		arr.sort(function(a,b){
		var fielda=a[sortstr].toLowerCase()
		var fieldb=b[sortstr].toLowerCase()
		return (fielda<fieldb)? -1 : (fielda>fieldb)? 1 : 0
		})
	}
	else{ //else, sort by "publishedDate" property (using error handling, as "publishedDate" may not be a valid date str if an error has occured while getting feed
		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 : "" //get all feed entries as a JSON array or "" if failed
    if (thisfeed == "") {  //if error has occured fetching feed
        this.feedcontainer.innerHTML = this.msg;
        //alert("Google Feed API Error: " + result.error.message)
        return;
    }
    for (var i = 0; i < thisfeed.length; i++) //For each entry within feed
        result.feed.entries[i].ddlabel = this.feedlabels[this.feedsfetched] //extend it with a "ddlabel" property
    this.feeds = this.feeds.concat(thisfeed) //add entry to array holding all feed entries
    this._signaldownloadcomplete() //signal the retrieval of this feed as complete (and move on to next one if defined)
}

gfeedfetcher.prototype._signaldownloadcomplete=function(){
	this.feedsfetched+=1
	if (this.feedsfetched==this.feedurls.length) //if all feeds fetched
		this._displayresult(this.feeds) //display results
}


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
}