/**
 * Created by jf on 2015/9/11.
 * Modified by bear on 2016/9/7.
 */
/**
 * 内容管理 - 文件上传控件
 */
$(function () {
    var pageManager = {
        $container: $('#container'),
        _pageStack: [],
        _configs: [],
        _pageAppend: function(){},
        _defaultPage: null,
        _pageIndex: 1,
        setDefault: function (defaultPage) {
            this._defaultPage = this._find('name', defaultPage);
            return this;
        },
        setPageAppend: function (pageAppend) {
            this._pageAppend = pageAppend;
            return this;
        },
        init: function () {
            var self = this;

            $(window).on('hashchange', function () {
                var state = history.state || {};
                var url = location.hash.indexOf('#') === 0 ? location.hash : '#';
                var page = self._find('url', url) || self._defaultPage;
                if (state._pageIndex <= self._pageIndex || self._findInStack(url)) {
                    self._back(page);
                } else {
                    self._go(page);
                }
            });

            if (history.state && history.state._pageIndex) {
                this._pageIndex = history.state._pageIndex;
            }

            this._pageIndex--;

            var url = location.hash.indexOf('#') === 0 ? location.hash : '#';
            var page = self._find('url', url) || self._defaultPage;
            this._go(page);
            return this;
        },
        push: function (config) {
            this._configs.push(config);
            return this;
        },
        go: function (to) {
            var config = this._find('name', to);
            if (!config) {
                return;
            }
            location.hash = config.url;
        },
        _go: function (config) {
            this._pageIndex ++;

            history.replaceState && history.replaceState({_pageIndex: this._pageIndex}, '', location.href);

            var html = $(config.template).html();
            var $html = $(html).addClass('slideIn').addClass(config.name);
            $html.on('animationend webkitAnimationEnd', function(){
                $html.removeClass('slideIn').addClass('js_show');
            });
            this.$container.append($html);
            this._pageAppend.call(this, $html);
            this._pageStack.push({
                config: config,
                dom: $html
            });

            if (!config.isBind) {
                this._bind(config);
            }

            return this;
        },
        back: function () {
            history.back();
        },
        _back: function (config) {
            this._pageIndex --;

            var stack = this._pageStack.pop();
            if (!stack) {
                return;
            }

            var url = location.hash.indexOf('#') === 0 ? location.hash : '#';
            var found = this._findInStack(url);
            if (!found) {
                var html = $(config.template).html();
                var $html = $(html).addClass('js_show').addClass(config.name);
                $html.insertBefore(stack.dom);

                if (!config.isBind) {
                    this._bind(config);
                }

                this._pageStack.push({
                    config: config,
                    dom: $html
                });
            }

            stack.dom.addClass('slideOut').on('animationend webkitAnimationEnd', function () {
                stack.dom.remove();
            });

            return this;
        },
        _findInStack: function (url) {
            var found = null;
            for(var i = 0, len = this._pageStack.length; i < len; i++){
                var stack = this._pageStack[i];
                if (stack.config.url === url) {
                    found = stack;
                    break;
                }
            }
            return found;
        },
        _find: function (key, value) {
            var page = null;
            for (var i = 0, len = this._configs.length; i < len; i++) {
                if (this._configs[i][key] === value) {
                    page = this._configs[i];
                    break;
                }
            }
            return page;
        },
        _bind: function (page) {
            var events = page.events || {};
            for (var t in events) {
                for (var type in events[t]) {
                    this.$container.on(type, t, events[t][type]);
                }
            }
            page.isBind = true;
        }
    };

    function fastClick(){
        var supportTouch = function(){
            try {
                document.createEvent("TouchEvent");
                return true;
            } catch (e) {
                return false;
            }
        }();
        var _old$On = $.fn.on;

        $.fn.on = function(){
            if(/click/.test(arguments[0]) && typeof arguments[1] == 'function' && supportTouch){ // 只扩展支持touch的当前元素的click事件
                var touchStartY, callback = arguments[1];
                _old$On.apply(this, ['touchstart', function(e){
                    touchStartY = e.changedTouches[0].clientY;
                }]);
                _old$On.apply(this, ['touchend', function(e){
                    if (Math.abs(e.changedTouches[0].clientY - touchStartY) > 10) return;

                    e.preventDefault();
                    callback.apply(this, [e]);
                }]);
            }else{
                _old$On.apply(this, arguments);
            }
            return this;
        };
    }
    
    function androidInputBugFix(){
        // .container 设置了 overflow 属性, 导致 Android 手机下输入框获取焦点时, 输入法挡住输入框的 bug
        // 相关 issue: https://github.com/weui/weui/issues/15
        // 解决方法:
        // 0. .container 去掉 overflow 属性, 但此 demo 下会引发别的问题
        // 1. 参考 http://stackoverflow.com/questions/23757345/android-does-not-correctly-scroll-on-input-focus-if-not-body-element
        //    Android 手机下, input 或 textarea 元素聚焦时, 主动滚一把
        if (/Android/gi.test(navigator.userAgent)) {
            window.addEventListener('resize', function () {
                if (document.activeElement.tagName == 'INPUT' || document.activeElement.tagName == 'TEXTAREA') {
                    window.setTimeout(function () {
                        document.activeElement.scrollIntoViewIfNeeded();
                    }, 0);
                }
            })
        }
    }

    function setPageManager(){
        var pages = {}, tpls = $('script[type="text/html"]');
        var winH = $(window).height();

        for (var i = 0, len = tpls.length; i < len; ++i) {
            var tpl = tpls[i], name = tpl.id.replace(/tpl_/, '');
            pages[name] = {
                name: name,
                url: '#' + name,
                template: '#' + tpl.id
            };
        }
        pages.home.url = '#';

        for (var page in pages) {
            pageManager.push(pages[page]);
        }
        pageManager
            .setPageAppend(function($html){
                var $foot = $html.find('.page__ft');
                if($foot.length < 1) return;

                if($foot.position().top + $foot.height() < winH){
                    $foot.addClass('j_bottom');
                }else{
                    $foot.removeClass('j_bottom');
                }
            })
            .setDefault('home')
            .init();
    }

    function init(){
        fastClick();
        androidInputBugFix();
       // setPageManager();

        window.pageManager = pageManager;
        window.home = function(){
            location.hash = '';
        };
    }
    init();
});