/**
 * Ajax Queue Plugin
 * 
 * Homepage: http://jquery.com/plugins/project/ajaxqueue
 * Documentation: http://docs.jquery.com/AjaxQueue
 *
 * Fixed for jQuery 1.3+
 * Thanks to http://www.onemoretake.com/2009/10/11/ajaxqueue-and-jquery-1-3/
 *
 * Compatible up to jQuery 1.7
 */

/*
 * Queued Ajax requests.
 * A new Ajax request won't be started until the previous queued 
 * request has finished.
 */

/*
 * Synced Ajax requests.
 * The Ajax request will happen as soon as you call this method, but
 * the callbacks (success/error/complete) won't fire until all previous
 * synced requests have been completed.
 */

(function($) {

	var ajax = $.ajax,
			pendingRequests = {},
			synced = [],
			syncedData = [],
			ajaxRunning = [];


	$.ajax = function(settings) {
		// create settings for compatibility with ajaxSetup
		settings = jQuery.extend(settings, jQuery.extend({}, jQuery.ajaxSettings, settings));

		var port = settings.port;

		switch (settings.mode) {
			case "abort":
				if (pendingRequests[port]) {
					pendingRequests[port].abort();
				}
				return pendingRequests[port] = ajax.apply(this, arguments);
			case "queue":
				var _old = settings.complete;
				settings.complete = function() {
					if (_old) {
						_old.apply(this, arguments);
					}
					if (jQuery([ajax]).queue("ajax" + port).length > 0) {
						jQuery([ajax]).dequeue("ajax" + port);
					} else {
						ajaxRunning[port] = false;
					}
				};

				jQuery([ajax]).queue("ajax" + port, function() {
					ajax(settings);
				});

				if (jQuery([ajax]).queue("ajax" + port).length == 1 && !ajaxRunning[port]) {
					ajaxRunning[port] = true;
					jQuery([ajax]).dequeue("ajax" + port);
				}

				return;
			case "sync":
				var pos = synced.length;

				synced[pos] = {
					error: settings.error,
					success: settings.success,
					complete: settings.complete,
					done: false
				};

				syncedData[pos] = {
					error: [],
					success: [],
					complete: []
				};

				settings.error = function() { syncedData[pos].error = arguments; };
				settings.success = function() { syncedData[pos].success = arguments; };
				settings.complete = function() {
					syncedData[pos].complete = arguments;
					synced[pos].done = true;

					if (pos == 0 || !synced[pos - 1])
						for (var i = pos; i < synced.length && synced[i].done; i++) {
							if (synced[i].error) synced[i].error.apply(jQuery, syncedData[i].error);
							if (synced[i].success) synced[i].success.apply(jQuery, syncedData[i].success);
							if (synced[i].complete) synced[i].complete.apply(jQuery, syncedData[i].complete);

							synced[i] = null;
							syncedData[i] = null;
						}
				};
		}
		return ajax.apply(this, arguments);
	};

})(jQuery);