$(document).ready( function () {
    // Remove redlinks if they exist upon pageload
    redlinks_removeall();
});
$(function($) {
	mw.loader.using( ['mediawiki.util'] ).then( function () {
		var portletlink = mw.util.addPortletLink('p-tb', '#', 'Remove redlinks');
		$(portletlink).click( function(e) {
			e.preventDefault();
			// Default parameters, and begin script on regular view of article
			var loc = window.location.href;
			var redlinks; var i;
			
			// Gather all redlinks with class "new"
			redlinks = [];
			var a = document.getElementsByTagName('a');
			for (i = 0; i < a.length; i++) {
				if (a[i].getAttribute('class') == "new") {
					redlinks[redlinks.length] = a[i].href.replace('https://en.wikipedia.org/w/index.php?title=','').replace('&action=edit&redlink=1','');
					redlinks[redlinks.length-1] = redlinks[redlinks.length-1].replace(/_/g,' ');
					redlinks[redlinks.length-1] = decodeURIComponent(redlinks[redlinks.length-1]);
				}
			}
			
			// Save all redlinks
			if (redlinks.length > 0) {
				localStorage.redlinks = JSON.stringify(redlinks);
				
				// If we are in the edit page, then remove redlinks automatically; if we are on the reading page, then go to the edit page
				if (window.location.href.indexOf('action') >= 0) redlinks_removeall();
				else {
					var pageTitle;
					if (window.location.href.indexOf('?title=') >= 0) {
						var regex = /\?title=(.+?)&/;
						var regexMatch = window.location.href.match(regex);
						pageTitle = regexMatch[1];
					} else {
						pageTitle = window.location.href;
						if (window.location.href.indexOf('#') >= 0) pageTitle = pageTitle.substr(0, pageTitle.indexOf('#'));
						pageTitle = pageTitle.substr(window.location.href.indexOf('/wiki/')+6);
					}
					window.location.href = "https://en.wikipedia.org/wiki/"+pageTitle+"?action=edit";
				}
			} else {
				alert('No redlinks!');
			}
		});
	});
});

function redlinks_removeall() {
    var wpTextbox1 = document.getElementById('wpTextbox1');
    if(!wpTextbox1) return;
	// Automatic removal of redlinks when stored.
    if (localStorage.redlinks !== "" && localStorage.redlinks !== undefined) {
		// Gather saved redlinks
		try { var redlinks = JSON.parse(localStorage.redlinks); } catch (e) {return;}
		
		// Regular expression to escape special characters
		var totalredlinks = 0;
		RegExp.quote = function(str) { return str.replace(/[.?*+^$[\]\\(){}|-]/g, "\\$&"); };

		for (i = 0; i < redlinks.length; i++) {
			// Regular expression for piped links and direct links
			var reglink1 = new RegExp('\\[\\[\\s*('+RegExp.quote(redlinks[i]).replace(/\s/g, "[\\s\\_]*")+')\\s*\\|\\s*([^\\]]*)\\s*\\]\\]','gi');
			var reglink2 = new RegExp('\\[\\[\\s*('+RegExp.quote(redlinks[i]).replace(/\s/g, "[\\s\\_]*")+')\\s*\\]\\]','gi');
			
			// Add total number of matches for both
			if (wpTextbox1.value.match(reglink1) !== null) totalredlinks += wpTextbox1.value.match(reglink1).length;
			if (wpTextbox1.value.match(reglink2) !== null) totalredlinks += wpTextbox1.value.match(reglink2).length; // Includes categories
			
			// Remove category rather than simply convert it to unlinked text
			if (redlinks[i].substr(0,9) == "Category:") {
				var reglink3 = new RegExp('\\[\\[\\s*('+RegExp.quote(redlinks[i])+')\\s*\\]\\]\\n','gi');
				wpTextbox1.value = wpTextbox1.value.replace(reglink3,"");
			}
			
			// Remove redlinks and convert to unlinked text
			wpTextbox1.value = wpTextbox1.value.replace(reglink1,"$2");
			wpTextbox1.value = wpTextbox1.value.replace(reglink2,"$1");
		}
		
		// Alert for summary of removed redlinks; total in edit summary
		if (totalredlinks > 0) {
			document.getElementById('wpSummary').value += "Removed "+totalredlinks+" redlink"+(totalredlinks==1?"":"s")+" via [[User:Alex 21/script-redlinks|script]].";
			alert("Automatically removed "+totalredlinks+" redlink"+(totalredlinks==1?"":"s")+"!");
		} else {
			// Redlinks were seen in the article but none were found in the wikicode - check the nevigational boxes for these redlinks
			alert('No redlinks in the article! (Check transcluded templates and the navigational boxes.)');
		}
		
		// Remove the template(s)
		wpTextbox1.value = wpTextbox1.value.replace(/\{\{[Cc]leanup-?\s*[Rr]ed\s*[Ll]inks?[^\}]*\}\}/g, "");
		wpTextbox1.value = wpTextbox1.value.replace(/\{\{[Rr]ed\s*links?[^\}]*\}\}/g, "");
		wpTextbox1.value = wpTextbox1.value.replace(/\{\{[Tt]oo many red links[^\}]*\}\}/g, "");
		
		// Clear all saved redlinks
		localStorage.redlinks = '';
	}
}