function ucjsYoutubeFlvDownloader(){
	this.SKIP_SELECT_PROMPT = true;
}

ucjsYoutubeFlvDownloader.prototype = {
	download: function(aServer,aTitle, aVideoID, aVideoIDopt,t){
		this._title = aTitle;

		this._state = 0;

		var youtubeURLSpec = "http://" + aServer + "youtube.com/get_video?video_id=" + aVideoID + "&t=" + t + aVideoIDopt;

		this._ioService = Components.classes["@mozilla.org/network/io-service;1"]
				.getService(Components.interfaces.nsIIOService);
		this.wrappedJSObject = this;

		this.saveFLV(aTitle,youtubeURLSpec);
	},

	saveFLV: function(aTitle, aFlvURLSpec){
		const FLV_EXTENSION = "flv";
		var FLV_CONTENT_TYPE = "video/flv";

		var flvName = aTitle + "." + FLV_EXTENSION;
		var flvURL = this._ioService.newURI(aFlvURLSpec, null, null)
				.QueryInterface(Components.interfaces.nsIURL);
		var fileInfo = new FileInfo(flvName, flvName, aTitle, FLV_EXTENSION, flvURL);
	    var fpParams = {
			fpTitleKey: "",
			isDocument: false,
			fileInfo: fileInfo,
			contentType: FLV_CONTENT_TYPE,
			saveMode: GetSaveModeForContentType(FLV_CONTENT_TYPE),
			saveAsType: 0,
			file: null,
			fileURL: null
		};
		if(!getTargetFile(fpParams, this.SKIP_SELECT_PROMPT)){
			return;
		}

		var fileURL = fpParams.fileURL || makeFileURI(fpParams.file);

		var persist = makeWebBrowserPersist();
		persist.persistFlags = Components.interfaces.nsIWebBrowserPersist
									.PERSIST_FLAGS_REPLACE_EXISTING_FILES;
		var transfer = Components.classes["@mozilla.org/transfer;1"]
						.createInstance(Components.interfaces.nsITransfer);
		transfer.init(fileInfo.uri, fileURL, "", null, null, null, persist);
		persist.progressListener = transfer;
	    persist.saveURI(fileInfo.uri, null, null, null, null, fileURL);
	}
};

var ucjsYoutubeFlvDownloaderContextMenu = {
	init: function(){
		var contentAreaContextMenu = document.getElementById("contentAreaContextMenu");

		this._menuItem  = document.createElement("menuitem");
		this._menuItem.setAttribute("label", "Download Flv");
		contentAreaContextMenu.insertBefore(this._menuItem,contentAreaContextMenu.firstChild);

		contentAreaContextMenu.addEventListener("popupshowing",
			function(){ ucjsYoutubeFlvDownloaderContextMenu.onPopupShowing(this); }, false);
	},

	onPopupShowing: function(aPopup){
		this._menuItem.hidden = true;

		//if(gContextMenu.target.id != "vidTitle") return;
		var location = gContextMenu.target.ownerDocument.location;
		if(location.host.indexOf("youtube.com") == -1) return;
		/^http:\/\/([^\./:@]+\.|)youtube\.com\/watch\?.*v=([a-zA-Z0-9_\-]{11})(&fmt=\d+|)/.exec(location);
		var Server = RegExp.$1;
		var videoID = RegExp.$2;
		var videoIDopt = RegExp.$3;
		var videoTitle = gContextMenu.target.textContent;
		var html = gContextMenu.target.ownerDocument.getElementsByTagName('html')[0].innerHTML;
		if(html.match(/var[ \r\n\t]+swfArgs[ \r\n\t]*=[ \r\n\t]*\{(.*,|)[ \r\n\t]*(t|'t'|"t")[ \r\n\t]*\:[ \r\n\t]*['"]([a-zA-Z\-_0-9]+)['"].*\}/)){
		}else{
			alert('youtubeDownloader: cannot match');
			return;
		}
		var t = RegExp.$3;
		var title = content.document.evaluate(".//div[@id='vidTitle']/span",content.document,null,XPathResult.FIRST_ORDERED_NODE_TYPE,null);
		if(!title.singleNodeValue) return;
		var videoTitle = (videoID+"." + String(title.singleNodeValue.textContent)).replace(/[\$\*\?\"\'\/\\\:]/g, "_");
		this._menuItem.setAttribute("oncommand", "ucjsYoutubeFlvDownloaderContextMenu.download('"+ Server +"','"+ videoTitle +"','"+ videoID +"','"+ videoIDopt +"','"+ t +"')");
		this._menuItem.hidden = false;
	},

	download: function(aServer,aTitle, aVideoID,aVideoIDopt,t){
		var d = new ucjsYoutubeFlvDownloader();
		d.download(aServer,aTitle, aVideoID,aVideoIDopt,t);
	}
};

ucjsYoutubeFlvDownloaderContextMenu.init();