/**
 * next-tick module
 *
 * Copyright (c) 2013 Filatov Dmitry (dfilatov@yandex-team.ru)
 * Dual licensed under the MIT and GPL licenses:
 * http://www.opensource.org/licenses/mit-license.php
 * http://www.gnu.org/licenses/gpl.html
 *
 * @version 1.0.1
 */

modules.define('y-next-tick', function(provide) {

/**
 * Вызывает переданную функцию в следующем тике.
 *
 * @name nextTick
 * @param {Function} callback
 */

var global = this.global,
    fns = [],
    enqueueFn = function(fn) {
        return fns.push(fn) === 1;
    },
    callFns = function() {
        var fnsToCall = fns, i = 0, len = fns.length;
        fns = [];
        while(i < len) {
            fnsToCall[i++]();
        }
    };

    if(typeof process === 'object' && process.nextTick) { // nodejs
        return provide(function(fn) {
            enqueueFn(fn) && process.nextTick(callFns);
        });
    }

    if(global.setImmediate) { // ie10
        return provide(function(fn) {
            enqueueFn(fn) && global.setImmediate(callFns);
        });
    }

    if(global.postMessage) { // modern browsers
        var isPostMessageAsync = true;
        if(global.attachEvent) {
            var checkAsync = function() {
                    isPostMessageAsync = false;
                };
            global.attachEvent('onmessage', checkAsync);
            global.postMessage('__checkAsync', '*');
            global.detachEvent('onmessage', checkAsync);
        }

        if(isPostMessageAsync) {
            var msg = '__nextTick' + +new Date,
                onMessage = function(e) {
                    if(e.data === msg) {
                        e.stopPropagation && e.stopPropagation();
                        callFns();
                    }
                };

            global.addEventListener?
                global.addEventListener('message', onMessage, true) :
                global.attachEvent('onmessage', onMessage);

            return provide(function(fn) {
                enqueueFn(fn) && global.postMessage(msg, '*');
            });
        }
    }

    var doc = global.document;
    if('onreadystatechange' in doc.createElement('script')) { // ie6-ie8
        var createScript = function() {
                var script = doc.createElement('script');
                script.onreadystatechange = function() {
                    script.parentNode.removeChild(script);
                    script = script.onreadystatechange = null;
                    callFns();
            };
            (doc.documentElement || doc.body).appendChild(script);
        };

        return provide(function(fn) {
            enqueueFn(fn) && createScript();
        });
    }

    provide(function(fn) { // old browsers
        enqueueFn(fn) && setTimeout(callFns, 0);
    });
});