// ==UserScript==
// @name           LiveJournal Quick Track Entries
// @namespace      http://afunamatata.com/greasemonkey/
// @description    Track entries with one click
// @include        http://*.livejournal.com*
// @tags           livejournal
// ==/UserScript==

/*== Some notes == 
	- Unwatching with one click does not work
	- You can still go to the interim page by ctrl/cmd/shift-clicking on the link (depends on the browser and OS)
	- (20070414) You can set the default notification mode to email/im/just message center by right-clicking on the monkey status bar icon, and then going to User Script Commands->(toggle your desired option). Please note that the menu text won't change until you refresh. As far as I can tell, this is a limitation of Greasemonkey and there's no way around it
	- Don't know what it does when you exceed your limit of tracked posts
	- Will change the icon/text to show that the entry is being tracked. This might not match the layout if you've customized icons/text, but it will show up as normal once you refresh the page
*/
function quick_track(url)
{
	return function(event) {
		event.stopPropagation();
		event.preventDefault();
	
		track_url = url;
			GM_xmlhttpRequest({
				method: 'GET',
				url: track_url,
				onload: function(responseDetails) {
					if (responseDetails.readyState == 4) {
						if (responseDetails.status != 200) return;
	                
	                    // check if it already exists
	                    // TODO: find a better way
	                    index  = responseDetails.responseText.substr(0,responseDetails.responseText.indexOf("Someone posts an entry")).indexOf('-old" value="1"');
	                    if(index != -1) {
	                        event.target.setAttribute("src", "http://stat.livejournal.com/img/btn_tracking.gif");
                            event.target.setAttribute("title", "Already tracked!");
                            
    	                    event.target.textContent = "Already tracked!";   
    	                    return;
	                    }
	                    
						index  = responseDetails.responseText.indexOf('lj_form_auth')+21;
						lj_form_auth = responseDetails.responseText.slice(index);
						lj_form_auth = lj_form_auth.slice(0,lj_form_auth.indexOf('"'));
						lj_form_auth = escape(lj_form_auth);
						lj_form_auth=lj_form_auth.replace("+", "%2B");
						lj_form_auth=lj_form_auth.replace("/", "%2F"); 
						
						index = responseDetails.responseText.indexOf('SubscriptionInboxCheck')+28;
						pending = responseDetails.responseText.slice(index);
						pending = pending.slice(0,pending.indexOf('"'));

                        by_email = GM_getValue("by_email", false)
                            ? "&" + pending.replace("4-1", "0-2") + "=on" 
                            : "";
                        by_sms = GM_getValue("by_SMS", false)
                            ? "&" + pending.replace("4-1", "0-3") + "=on" 
                            : "";
                        by_im = GM_getValue("by_IM", false)
                            ? "&" + pending.replace("4-1", "0-4") + "=on"
                            : "";

						
						GM_xmlhttpRequest({
							method: 'POST',
							url: 'http://www.livejournal.com/manage/subscriptions/',
							data: "lj_form_auth="+lj_form_auth+"&"+pending+"=on&mode=save_subscriptions"+by_email+by_sms+by_im,
							headers: {'Content-type': 'application/x-www-form-urlencoded'},
							onload: function(details) {
								if(details.readyState == 4)  {
									if (details.status != 200) return;
									
									// not bothering to distinguish whether it's an image or a link
									// also, not bothering to try to fit it into the layout since it's just a temporary indicator
									event.target.setAttribute("src", "http://stat.livejournal.com/img/btn_tracking.gif");
									event.target.textContent = "Tracked";
								}
							}
						}); 
					}
				}
			
			});
	}
}

function toggleMenu(target)
{
    if(GM_getValue("by_"+target, false))
    {
        GM_registerMenuCommand("Disable notifications via "+target, function(event)
        {
            GM_setValue("by_"+target, false);
        });
    }
    else
    {
        GM_registerMenuCommand("Enable notifications via "+target, function(event)
        {
            GM_setValue("by_"+target, true);
        });
    }
}

toggleMenu("email");
toggleMenu("IM");
//toggleMenu("SMS");

xpath = document.evaluate("//a[contains(@href, 'subscriptions/entry.bml?journal=')]", document, null, XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE, null);
for(i = 0; i < xpath.snapshotLength; ++i)
{
	a = xpath.snapshotItem(i);
	a.addEventListener("click", quick_track(a.href) , false);
}