// ==UserScript==
// @name        /b/ 404 suite
// @author      team!kittensORw
// @namespace   2-hi.me
// @description Detects 4chan 404s (even API-silent ones), stitches 404'd thread onto new thread.
// @include     http*://*4chan.org/b/res/*
// @version     1
// ==/UserScript==

//Gets query strings from the URL
	function getUrlVars() {
	var vars = {};
	var parts = window.location.href.replace(/[?&]+([^=&]+)=([^&]*)/gi, function(m,key,value) {
	vars[key] = value;});
	return vars;}
//gets the old thread ID from the query string, if any
	var oldhorse = getUrlVars()["oldt"];
//Works out the board and the thread ID. we don't use the board yet, so far /b/ only.
	var boardS = window.location.pathname.split( '/res/' );
	var board1 = boardS[0].split( '/' );
	var board2 = boardS[1].split( '.' );
	var board = board1[1];
	var thread = board2[0];
//Makes the 404 alert, with the textbox and such.
	var deadWin = document.createElement("div");
	deadWin.id = "deadWin";
	deadWin.setAttribute("align", "left");
	deadWin.style.top = "50px";
	deadWin.style.title = "close";
	deadWin.style.width = "200px";
	deadWin.style.left = "50%";
	deadWin.style.marginLeft = "-100px";
	deadWin.style.position = "fixed";
	deadWin.style.border = "1px solid";
	deadWin.style.borderRadius = "15px";
	deadWin.style.opacity = "0.6";
	deadWin.style.display = "none";
	deadWin.style.background = "#980000";
	deadWin.innerHTML = '<div id="clsNt" style="position:relative;top:5px;right:-5px;color:#ffffff;cursor:pointer;width:10px;"><b>X</b></div><center><h1 style="color:#ffffff">404</h1><input name="newtr" id="newtr" placeholder="new thread no."><input id="gostitch" type="submit" value="go"><br><br></center>';
	document.body.appendChild(deadWin);
//Starts the 404 scan
	var timerVar=setInterval(function(){checkTimer()},20000);
	function checkTimer(){
	GM_xmlhttpRequest({
	method: "GET",
	url: document.URL,
	onload: function(response) {
//What happens when it finds 404
	if (response.status == 404){
	deadWin.style.display = "";
	clearInterval(timerVar);
//Starts the batte with 4chan X for the right to set the page title. It sets every 5 secs.
	var xbattleVar=setInterval(function(){battleX()},5000);
	function battleX(){
	document.title = "404 :c";
	}}}});}
//hides the window when you click the x
	function hideLisn(){
	deadWin.style.display = "none";}
	document.getElementById("clsNt").addEventListener('click',hideLisn,false);
//What happens when you give it the new thread to load, starts all the stitching and stuff
	var ntrgo = document.getElementById('gostitch');
	ntrgo.addEventListener("click", function() {var ntrinp = document.getElementById('t' + thread).innerHTML; GM_setValue("old" + thread, ntrinp); window.location.href = 'http://boards.4chan.org/b/res/' + document.getElementById("newtr").value + '?oldt=' + thread;});
//What to do if it finds and old thread requester in the URL query strings
	if (oldhorse){
//Makes it safe to click quotes in the old thread
	var regexOld1 = new RegExp(oldhorse + "#p", "g");
	var inOldhorse = GM_getValue("old" + oldhorse).replace(regexOld1,"#p");
//works out where to stitch the thread on the new page, make the target div
	var stitchneT1 = document.getElementById('t' + thread);
	var stitcholT1 = document.createElement("div");
	stitcholT1.id = "t" + oldhorse;
//gives the old thread the thread class. makes some stuff work, breaks some other stuff. i don't like it, so it's commented.
	//stitcholT1.className = "thread";
//Stitches in the old thread
	stitchneT1.parentNode.insertBefore(stitcholT1, stitchneT1);
	stitcholT1.innerHTML += inOldhorse;
//and clears the saved old thread to preven loads of permenantly stored dead threads.
	GM_deleteValue("old" + oldhorse);
}