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

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

function gfeedfetcher(){
	this.linktarget="_new" //クリック時にどこにページを立ち上げるか
	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=1
	this.showoptions="label datetime snippet"
	this.sortstring="date"
	document.write('<div id="rss"></div>')
	this.feedcontainer=document.getElementById("rss")
}

//htmlからフィードを読み込む
gfeedfetcher.prototype.addFeed=function(label, url){
	this.feedlabels[this.feedlabels.length]=label
	this.feedurls[this.feedurls.length]=url
}


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.feedcontainer.innerHTML='<div id="date"></div><div id="title"></div><div id="column"><img src="http://www.dai2ntv.jp/images/indicator.gif" /> 読み込み中...</div>'
	var displayer=this
	for (var i=0; i<this.feedurls.length; i++){ //loop through the specified RSS feeds' URLs
		var Feed=new google.feeds.Feed(this.feedurls[i]) //create new instance of Google Ajax Feed API
		Feed.setNumEntries(1) //1つのフィードから読み込むエントリーの数
		Feed.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() : ""
	var parseddate=(showoptions.indexOf("date")!=-1)? itemdate.toLocaleDateString() : (showoptions.indexOf("time")!=-1)? itemdate.toLocaleTimeString() : ""
	return parseddate
}

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
		//alert("Google Feed API Error: "+result.error.message)
	for (var i=0; i<thisfeed.length; i++) //For each entry within feed
		result.feed.entries[i].ddlabel=this.feedlabels[this.feedsfetched] //「ddlabel」の資産でそれを広げてください--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=""
	
	gfeedfetcher._sortarray(feeds, this.sortstring)
	
	if(feeds[0] != ""){
		var itemdate=gfeedfetcher._formatdate(feeds[0].publishedDate, this.showoptions)
		var itemtitle=feeds[0].title
		
		rssoutput+='<div id="date">▼' + itemdate + '</div>';
		rssoutput+='<div id="title"><a href="' + feeds[0].link + '" target="_blank">' + itemtitle + '</a></div>';
		rssoutput+='<div id="column">' + feeds[0].content + '</div>';
	}
	
	this.feedcontainer.innerHTML=rssoutput
}