/**
 * Created by Administrator on 2015/11/20.
 */

// 需要引入 zepto.min.js 檔案

// dropload.js 檔案內容

;(function($){
    'use strict';
var $win = $(window);
var $doc = $(document);
$.fn.dropload = function(options){
        return new MyDropLoad(this, options);
};
var MyDropLoad = function(element, options){
        var 
 
me = this;
me.$element = $(element);
me.insertDOM = false;
me.loading = false;
me.isLock = false;
me.init(options);
};
// 初始化
MyDropLoad.prototype.init = function(options){
        var me = this;
me.opts = $.extend({}, {
            scrollArea : me.$element,                                            
 
// 滑動區域
domUp : {                                                            // 上方DOM
domClass   : 'dropload-up',
domRefresh : '<div class="dropload-refresh">↓下拉重新整理</div>',
domUpdate  : '<div class="dropload-update">↑釋放更新</div>',
domLoad    : '<div class="dropload-load"><span class="loading"></span>
 
載入中...</div>'
},
domDown : {                                                          // 下方DOM
domClass   : 'dropload-down',
domRefresh : '<div class="dropload-refresh">↑上拉載入更多</div>',
domUpdate  : '<div class="dropload-update">↓釋放載入</div>',
domLoad    : '<div class="dropload-load"><span class="loading"></span>載入中...</div>'
},
distance : 50,                                                       // 拉動距離
loadUpFn : '',                                                       // 上方function
loadDownFn : ''                                                      // 下方function
}, options);
// 判斷滾動區域
if(me.opts.scrollArea == window){
            me.$scrollArea = $win;
}else{
            me.$scrollArea = me.opts.scrollArea;
}

        // 繫結觸控
me.$element.on('touchstart',function(e){
            if(!me.loading && !me.isLock){
                fnTouches(e);
fnTouchstart(e, me);
}
        });
me.$element.on('touchmove',function(e){
            if(!me.loading && !me.isLock){
                fnTouches(e, me);
fnTouchmove(e, me);
}
        });
me.$element.on('touchend',function(){
            if(!me.loading && !me.isLock){
                fnTouchend(me);
}
        });
};
// touches
function fnTouches(e){
        if(!e.touches){
            e.touches = e.originalEvent.touches;
}
    }

    // touchstart
function fnTouchstart(e, me){
        me._startY = e.touches[0].pageY;
// 判斷滾動區域
if(me.opts.scrollArea == window){
            me._meHeight = $win.height();
me._childrenHeight = $doc.height();
}else{
            me._meHeight = me.$element.height();
me._childrenHeight = me.$element.children().height();
}
        me._scrollTop = me.$scrollArea.scrollTop();
}

    // touchmove
function fnTouchmove(e, me){
        me._curY = e.touches[0].pageY;
me._moveY = me._curY - me._startY;
if(me._moveY > 0){
            me.direction = 'down';
}else if(me._moveY < 0){
            me.direction = 'up';
}

        var _absMoveY = Math.abs(me._moveY);
// 載入上方
if(me.opts.loadUpFn != '' && me._scrollTop <= 0 && me.direction == 'down'){
            e.preventDefault();
if(!me.insertDOM){
                me.$element.prepend('<div class="'+me.opts.domUp.domClass+'"></div>');
me.insertDOM = true;
}

            me.$domUp = $('.'+me.opts.domUp.domClass);
fnTransition(me.$domUp,0);
// 下拉
if(_absMoveY <= me.opts.distance){
                me._offsetY = _absMoveY;
// 待解決：move時會不斷清空、增加dom，有可能影響效能，下同
me.$domUp.html('').append(me.opts.domUp.domRefresh);
// 指定距離 < 下拉距離 < 指定距離*2
}else if(_absMoveY > me.opts.distance && _absMoveY <= me.opts.distance*2){
                me._offsetY = me.opts.distance+(_absMoveY-me.opts.distance)*0.5;
me.$domUp.html('').append(me.opts.domUp.domUpdate);
// 下拉距離 > 指定距離*2
}else{
                me._offsetY = me.opts.distance+me.opts.distance*0.5+(_absMoveY-me.opts.distance*2)*0.2;
}

            me.$domUp.css({'height': me._offsetY});
}

        // 載入下方
if(me.opts.loadDownFn != '' && me._childrenHeight <= (me._meHeight+me._scrollTop) && me.direction == 'up'){
            e.preventDefault();
if(!me.insertDOM){
                me.$element.append('<div class="'+me.opts.domDown.domClass+'"></div>');
me.insertDOM = true;
}

            me.$domDown = $('.'+me.opts.domDown.domClass);
fnTransition(me.$domDown,0);
// 上拉
if(_absMoveY <= me.opts.distance){
                me._offsetY = _absMoveY;
me.$domDown.html('').append(me.opts.domDown.domRefresh);
// 指定距離 < 上拉距離 < 指定距離*2
}else if(_absMoveY > me.opts.distance && _absMoveY <= me.opts.distance*2){
                me._offsetY = me.opts.distance+(_absMoveY-me.opts.distance)*0.5;
me.$domDown.html('').append(me.opts.domDown.domUpdate);
// 上拉距離 > 指定距離*2
}else{
                me._offsetY = me.opts.distance+me.opts.distance*0.5+(_absMoveY-me.opts.distance*2)*0.2;
}

            me.$domDown.css({'height': me._offsetY});
me.$scrollArea.scrollTop(me._offsetY+me._scrollTop);
}
    }

    // touchend
function fnTouchend(me){
        var _absMoveY = Math.abs(me._moveY);
if(me.insertDOM){
            if(me.direction == 'down'){
                me.$domResult = me.$domUp;
me.domLoad = me.opts.domUp.domLoad;
}else if(me.direction == 'up'){
                me.$domResult = me.$domDown;
me.domLoad = me.opts.domDown.domLoad;
}

            fnTransition(me.$domResult,300);
if(_absMoveY > me.opts.distance){
                me.$domResult.css({'height':me.$domResult.children().height()});
me.$domResult.html('').append(me.domLoad);
fnCallback(me);
}else{
                me.$domResult.css({'height':'0'}).on('webkitTransitionEnd',function(){
                    me.insertDOM = false;
$(this).remove();
});
}
            me._moveY = 0;
}
    }

    // 回撥
function fnCallback(me){
        me.loading = true;
if(me.opts.loadUpFn != '' && me.direction == 'down'){
            me.opts.loadUpFn(me);
}else if(me.opts.loadDownFn != '' && me.direction == 'up'){
            me.opts.loadDownFn(me);
}
    }

    // 鎖定
MyDropLoad.prototype.lock = function(){
        var me = this;
me.isLock = true;
};
// 解鎖
MyDropLoad.prototype.unlock = function(){
        var me = this;
me.isLock = false;
};
// 重置
MyDropLoad.prototype.resetload = function(){
        var me = this;
if(!!me.$domResult){
            me.$domResult.css({'height':'0'}).on('webkitTransitionEnd',function(){
                me.loading = false;
me.insertDOM = false;
$(this).remove();
});
}
    };
// css過渡
function fnTransition(dom,num){
        dom.css({
            '-webkit-transition':'all '+num+'ms',
'transition':'all '+num+'ms'
});
}
})(window.Zepto || window.jQuery);

// 呼叫js

// 下拉載入圖片
$('.good_intro').dropload({
    domUp : {
        domClass   : 'dropload-up',
domRefresh : '<div class="dropload-refresh">↓下拉重新整理</div>',
domUpdate  : '<div class="dropload-update">↑釋放更新</div>',
domLoad    : '<div class="dropload-load"><span class="loading"></span>載入中...</div>'
},
loadDownFn : function(me){
        if($.trim($('#details').html())==null||$.trim($('#details').html())=='') {
            var url = "../picture/" + $("#productId").val() + ".html";
$.ajax({
                type: 'GET',
url: url,
success: function (data) {
                    if (null == data || data.length <= 0) {
                        me.resetload();
return;
} else {

                        // 測試效果
setTimeout(function () {
                            $('#details').html(data.mobileDesc);
me.resetload();
}, 1000);
}
                },
error: function (xhr, type) {
                    alert('Ajax error!');
me.resetload();
}
            });
}else{
            me.resetload();
}
    }
});