var swod = '<div class="loading"></div>';

if((window.location.hostname == 'kp4') || (window.location.hostname == 'cas.richmond.edu') || (window.location.hostname == 'vmtrain.richmond.edu')) {
	var xhr = new XMLHttpRequest();
	var scriptsCounter = 0;
	var assetLoader = 'https://webapps.richmond.edu/_KP4_assets/actions/get/cascadeAssetLoader.php'; // Using webapps for the https protocol.
	//assetLoader = 'http://localkp4assets:8080/actions/get/cascadeAssetLoader.php';

	var scriptsHead = [];
	var scriptsBody = [];
	var scriptsFooter = [];

	if(typeof siteName !== "undefined"){
		assetLoader += '?siteName=' + siteName;
	}

	function addScript(scripts, i, position){
		var source = scripts[i];
		var target = false;

		if(position == 'head'){
			target = document.head;
		} else if(position == 'body'){
			target = document.body;
		} else if(position == 'footer'){
			target = document.getElementById('footer');
		}

		if(target) {
			if (source.indexOf('<script') !== -1) {
				// Inline Script
				target.insertAdjacentHTML('beforeend', scripts[i]);
				var allscripts = target.getElementsByTagName('script');
				var newscript = allscripts[allscripts.length - 1];
				eval(newscript.innerHTML); // run script's code

				scriptsCounter++;
				if (scriptsCounter <= scripts.length - 1) {
					addScript(scripts, scriptsCounter, position);
				} else {
					scriptsCounter = 0;
					if(position == 'head'){
						addScript(scriptsBody, scriptsCounter, 'body');
					}
					if(position == 'body'){
						addScript(scriptsFooter, scriptsCounter, 'footer');
					}
				}
			} else {
				// External Script
				if (source.indexOf('jquery-1') !== -1 && window.jQuery != null) {
					// Do nothing if substring 'jquery-1' is part of string (denoting it is trying to load the jquery framework)
					// and window.JQuery is not null meaning a jquery framework has already been loaded
					console.log('Skipped loading jquery framework.');
					scriptsCounter++;
					if (scriptsCounter <= scripts.length - 1) {
						addScript(scripts, scriptsCounter, position);
					} else {
						scriptsCounter = 0;
						if(position == 'head'){
							addScript(scriptsBody, scriptsCounter, 'body');
						}
						if(position == 'body'){
							addScript(scriptsFooter, scriptsCounter, 'footer');
						}
					}
				}
				else {
					var extScript = document.createElement('script');
					extScript.src = source;
					extScript.onload = function () {
						scriptsCounter++;
						if (scriptsCounter <= scripts.length - 1) {
							addScript(scripts, scriptsCounter, position);
						} else {
							scriptsCounter = 0;
							if(position == 'head'){
								addScript(scriptsBody, scriptsCounter, 'body');
							}
							if(position == 'body'){
								addScript(scriptsFooter, scriptsCounter, 'footer');
							}
						}
					};
					target.appendChild(extScript);
				}
			}
		}
	}

	xhr.open('GET', assetLoader, true);
	xhr.send(null);
	xhr.onreadystatechange = function() {
		var DONE = 4; // readyState 4 means the request is done.
		var OK = 200; // status 200 is a successful return.
		if (xhr.readyState === DONE) {
			if (xhr.status === OK) {
				var response = JSON.parse(xhr.responseText);
				document.head.insertAdjacentHTML('afterbegin',response.headerMeta + response.headerStyles); // Add Meta and Style to the page
				scriptsHead = Object.keys(response.scriptsHead).map(function(k) { return response.scriptsHead[k] });  // Map json object to array
				scriptsHead = scriptsHead.filter(Boolean); // Trim empty array indexes

				scriptsBody = Object.keys(response.scriptsBody).map(function(k) { return response.scriptsBody[k] });  // Map json object to array
				scriptsBody = scriptsBody.filter(Boolean); // Trim empty array indexes

				scriptsFooter = Object.keys(response.scriptsFooter).map(function(k) { return response.scriptsFooter[k] });  // Map json object to array
				scriptsFooter = scriptsFooter.filter(Boolean); // Trim empty array indexes

				addScript(scriptsHead, scriptsCounter, 'head');
			} else {
				console.log('Error: ' + xhr.status); // An error occurred during the request.
			}
		}
	};
}