// Copyright (c) 2017 Florian Klampfer <https://qwtel.com/>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

// Compress via uglify:
// uglifyjs load-js.js -c -m > load-js.min.js
!(function (window, document) {
	"use strict";

	function addEvent(el, type, cb, opts) {
		if (el.addEventListener) el.addEventListener(type, cb, opts);
		else if (el.attachEvent) el.attachEvent("on" + type, cb);
		else el["on" + type] = cb;
	}

	window.loadJS = function (src, cb) {
		var script = document.createElement("script");
		script.src = src;
		if (cb) addEvent(script, "load", cb, { once: true });
		var ref = document.scripts[0];
		ref.parentNode.insertBefore(script, ref);

		return script;
	};

	window._loaded = false;
	window.loadJSDeferred = function (src, cb) {
		var script = document.createElement("script");
		script.src = src;

		function insert() {
			window._loaded = true;
			if (cb) addEvent(script, "load", cb, { once: true });
			var ref = document.scripts[0];
			ref.parentNode.insertBefore(script, ref);
		}

		if (window._loaded) insert();
		else addEvent(window, "load", insert, { once: true });

		return script;
	};

	window.setRel = window.setRelStylesheet = function (id) {
		var link = document.getElementById(id);
		function set() {
			this.rel = "stylesheet";
		}
		addEvent(link, "load", set, { once: true });
	};
})(window, document);