// [[User:Scottywong/diffconverter.js]] - modified to add toolbar button instead of shortcut key using code from [[User:Js/urldecoder.js]
 
 var btn = newToolbarBtn;
function addDiffDecoderButton(){
	btn(
		'diffDecoder', 
		diffRun, 
		'https://upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Accept.svg/30px-Accept.svg.png', 
		'Diff Converter - Scottywong/diffconverter.js'
	);
}

mw.loader.using( [ 'user.options', 'jquery.textSelection' ], function () {
	/* Check if view is in edit mode and that the required modules are available. Then, customize the toolbar . . . */
	if ( $.inArray( mw.config.get( 'wgAction' ), [ 'edit', 'submit' ] ) !== -1 ) {
		$(document).ready( function () {
			if ( mw.user.options.get('usebetatoolbar') ) {
				mw.loader.using( 'ext.wikiEditor', addDiffDecoderButton );
			} 
		} );
	}
	// Add the customizations to LiquidThreads' edit toolbar, if available
	mw.hook( 'ext.lqt.textareaCreated' ).add( addDiffDecoderButton );
} );
 
 function newToolbarBtn(bId, bFunc, bIcon, bTitle){  
 
  var msg = {}; msg[bId] = bTitle; mw.messages.set(msg) // mw.usability.addMessages(msg)  doesn't work
  $('#wpTextbox1').wikiEditor('addToToolbar', {
   section:'main', group:'insert', tools: {
    bId:{
     type: 'button',
     action: {type:'callback', execute: bFunc},
     labelMsg: bId,
     icon: bIcon
  }}})

 }
 

function diffRun()
{
		if (window.getSelection)			//if any text is selected
		{
			var diffstr = window.getSelection().toString();
                        if (diffstr == "") diffstr = document.editform.wpTextbox1.value.substr(document.editform.wpTextbox1.selectionStart, document.editform.wpTextbox1.selectionEnd - document.editform.wpTextbox1.selectionStart);
			
                        var diffstr2 = diffstr;
			var article = decodeURIComponent(urlparse("title", diffstr).replace(/_/g, " "));
			var diff = urlparse("diff", diffstr);
			var oldid = urlparse("oldid", diffstr);
			var label = "Diff of " + article;
			var oldidlabel = "Previous revision of " + article;
			var anchor = "";
			
			if (diffstr.indexOf(" ") != -1)
			{
				label = diffstr.slice(diffstr.indexOf(" ") + 1);
				diffstr2 = diffstr.slice(0, diffstr.indexOf(" "));
				if (label[label.length - 1] == "]")
				{
					label = label.slice(0, label.length - 1);
				}
				oldidlabel = label;
			}
			if (diffstr.indexOf("#") != -1)
			{
				anchor = encodeURIComponent(diffstr2.slice(diffstr.indexOf("#")).replace(/_/g, " "));
				if (anchor[anchor.length - 1] == "]")
				{
					anchor = anchor.slice(0, anchor.length - 1);
				}
			}
			
			if (article == "")
			{
				alert("Diffconverter.js: Invalid URL.  Ensure that you have selected a valid diff URL.");
			}
			else if (article != "" && diff != "" && oldid != "")	//diff URL should have all three parameters
			{
				var start = document.editform.wpTextbox1.selectionStart;
				var len = diffstr.length;
				var difftemplate = "{" + "{diff|" + article + anchor + "|" + diff + "|" + oldid + "|" + "}" + "}";
				document.editform.wpTextbox1.value = document.editform.wpTextbox1.value.substring(0, start) + difftemplate + document.editform.wpTextbox1.value.substring(start + len);
			}
			else if (article != "" && oldid != "" && diff == "")	//oldid URL doesn't contain a diff parameter
			{
				var start = document.editform.wpTextbox1.selectionStart;
				var len = diffstr.length;
				var difftemplate = "{" + "{oldid|" + article + anchor + "|" + oldid + "|" + oldidlabel + "}" + "}";
				document.editform.wpTextbox1.value = document.editform.wpTextbox1.value.substring(0, start) + difftemplate + document.editform.wpTextbox1.value.substring(start + len);
			}
			else if (article != "" && oldid == "" && diff == "")	//no diff, no oldid, just create a wikilink out of it
			{
				var start = document.editform.wpTextbox1.selectionStart;
				var len = diffstr.length;
				var wikilink = "[[" + article + "]]";
				document.editform.wpTextbox1.value = document.editform.wpTextbox1.value.substring(0, start) + wikilink + document.editform.wpTextbox1.value.substring(start + len);
			}
		}
		else
		{
			alert("Diffconverter.js: No text selected.");
		}

}

function urlparse(name, url)	//thanks to http://www.netlobo.com/url_query_string_javascript.html for this function
{
	name = name.replace(/[\[]/,"\\\[").replace(/[\]]/,"\\\]");
	var regexS = "[\\?&]"+name+"=([^&#]*)";
	var regex = new RegExp(regexS);
	var results = regex.exec(url);
	if(results == null)
	{
		return "";
	}
	else
	{
		if (results[1].indexOf(" ") != -1)
			results[1] = results[1].slice(0, results[1].indexOf(" "));
		if (results[1][results[1].length - 1] == "]")
			results[1] = results[1].slice(0, results[1].length - 1);
		return results[1];
	}
}