/*
* This file is part of the jquery plugin "asyncQueue".
*
* (c) Sebastien Roch <roch.sebastien@gmail.com>
* @author (parallel) Dmitry Farafonov
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
(function ($) {
    $.AsyncQueue = function () {
        var that = this,
            queue = [],
            completeFunc,
            failureFunc,
            paused = false,
            lastCallbackData,
            _run,
            _complete,
            inQueue = 0,
            defaultTimeOut = 10;

        _run = function () {
            var f = queue.shift();

            if (f) {
                inQueue++;
                setTimeout(function () {
                    f.fn.apply(that, [that]);

                    if (!f.isParallel)
                        if (paused === false) {
                            _run();
                        }
                    inQueue--;
                    if (inQueue == 0 && queue.length == 0)
                        _complete();
                }, f.timeOut);

                if (f.isParallel)
                    if (paused === false) {
                        _run();
                    }
            }
        };

        _complete = function () {
            if (completeFunc)
                completeFunc.apply(that, [that]);
        };

        this.onComplete = function (func) {
            completeFunc = func;
        };

        this.onFailure = function (func) {
            failureFunc = func;
        };

        this.add = function (func) {
            // TODO: add callback for queue[i] complete

            var obj = arguments[0];
            if (obj && Object.prototype.toString.call(obj) === "[object Array]") {
                var fn = arguments[1];
                var timeOut = (typeof (arguments[2]) != "undefined") ? arguments[2] : defaultTimeOut;
                if (typeof (fn) == "function") {
                    for (var i = 0; i < obj.length; i++) {
                        var f = function (objx) {
                            queue.push({
                                isParallel: true, fn: function () {
                                    fn.apply(that, [that, objx]);
                                }, timeOut: timeOut
                            });
                        }(obj[i])
                    }
                }
            } else {
                var fn = arguments[0];
                var timeOut = (typeof (arguments[1]) != "undefined") ? arguments[2] : defaultTimeOut;
                queue.push({isParallel: false, fn: func, timeOut: timeOut});
            }
            return this;
        };

        this.addParallel = function (func, timeOut) {
            // TODO: add callback for queue[i] complete

            queue.push({isParallel: true, fn: func, timeOut: timeOut});
            return this;
        };

        this.storeData = function (dataObject) {
            lastCallbackData = dataObject;
            return this;
        };

        this.lastCallbackData = function () {
            return lastCallbackData;
        };

        this.run = function () {
            paused = false;
            _run();
        };

        this.pause = function () {
            paused = true;
            return this;
        };

        this.failure = function () {
            paused = true;
            if (failureFunc) {
                var args = [that];
                for (i = 0; i < arguments.length; i++) {
                    args.push(arguments[i]);
                }
                failureFunc.apply(that, args);
            }
        };

        this.size = function () {
            return queue.length;
        };

        return this;
    }
})(jQuery);
