;(function ($, window) {
    let ele = null,
        exzoom_img_box = null,
        boxwidth = null,
        boxheight = null,
        exzoom_img_ul_outer = null,//鐢ㄤ簬闄愬埗 ul 瀹藉害,鍙堜笉褰卞搷鏀惧ぇ闀滃尯鍩?        exzoom_img_ul = null,
        exzoom_img_ul_position = 0,//寰幆鍥剧墖鍖哄煙鐨勮竟璺?鐢ㄤ簬绉诲姩鏃惰窡闅忓厜鏍?        exzoom_img_ul_width = 0,//寰幆鍥剧墖鍖哄煙鐨勬渶澶у搴?        exzoom_img_ul_max_margin = 0,//寰幆鍥剧墖鍖哄煙鐨勬渶澶у杈硅窛,搴旇鏄浘鐗囨暟閲忓噺涓€涔樹互boxwidth
        exzoom_nav = null,
        exzoom_nav_inner = null,
        navhightclass = "current",//褰撳墠鍥剧墖鐨勭被,
        exzoom_navspan = null,
        navheightwithborder = null,
        images = null,
        exzoom_prev_btn = null,//瀵艰埅涓婁竴寮犲浘鐗?        exzoom_next_btn = null,//瀵艰埅涓嬩竴寮犲浘鐗?        imgnum = 0,//鍥剧墖鐨勬暟閲?        imgindex = 0,//褰撳墠鍥剧墖鐨勭储寮?        imgarr = [],//鍥剧墖灞炴€х殑鏁板瓧
        exzoom_zoom = null,
        exzoom_main_img = null,
        exzoom_zoom_outer = null,
        exzoom_preview = null,//棰勮鍖哄煙
        exzoom_preview_img = null,//棰勮鍖哄煙鐨勫浘鐗?        autoplayinterval = null,//鐢ㄤ簬鎺у埗鑷姩鎾斁鐨勯棿闅旀椂闂?        startx = 0,//绉诲姩鍏夋爣鐨勮捣濮嬪潗鏍?        starty = 0,//绉诲姩鍏夋爣鐨勮捣濮嬪潗鏍?        endx = 0,//绉诲姩鍏夋爣鐨勭粓姝㈠潗鏍?        endy = 0,//绉诲姩鍏夋爣鐨勭粓姝㈠潗鏍?        g = {},//鍏ㄥ眬鍙橀噺
        defaults = {
            "navwidth": 60,//鍒楄〃姣忎釜瀹藉害,璇ョ増鏈腑璇锋妸瀹介珮濉啓鎴愪竴鏍?            "navheight": 60,//鍒楄〃姣忎釜楂樺害,璇ョ増鏈腑璇锋妸瀹介珮濉啓鎴愪竴鏍?            "navitemnum": 5,//鍒楄〃鏄剧ず涓暟
            "navitemmargin": 7,//鍒楄〃闂撮殧
            "navborder": 1,//鍒楄〃杈规锛屾病鏈夎竟妗嗗～鍐?锛岃竟妗嗗湪css涓慨鏀?            "autoplay": true,//鏄惁鑷姩鎾斁
            "autoplaytimeout": 2000,//鎾斁闂撮殧鏃堕棿
        };


    let methods = {
        init: function (options) {
            let opts = $.extend({}, defaults, options);

            ele = this;
            exzoom_img_box = ele.find(".exzoom_img_box");
            exzoom_img_ul = ele.find(".exzoom_img_ul");
            exzoom_nav = ele.find(".exzoom_nav");
            exzoom_prev_btn = ele.find(".exzoom_prev_btn");//缂╃暐鍥惧鑸笂涓€寮犳寜閽?            exzoom_next_btn = ele.find(".exzoom_next_btn");//缂╃暐鍥惧鑸笅涓€寮犳寜閽?
            //todo 浠ュ悗鍙互鍒嗗紑瀹藉害鍜岄珮搴︾殑闄愬埗
            boxheight = boxwidth = ele.outerwidth();  //鍦ㄥ皬灞忓箷涓?鏈?padding 鐨勬儏鍐典笅,璁＄畻涓嶅噯,闇€瑕佹墜鍔ㄦ寚瀹?ele 鐨勫搴?
            // console.log("boxwidth::" + boxwidth);
            // console.log("ele.parent().width()::" + ele.parent().width());
            // console.log("ele.parent().outerwidth()::" + ele.parent().outerwidth());
            // console.log("ele.parent().innerwidth()::" + ele.parent().innerwidth());

            //todo 缂╃暐鍥惧鑸殑楂樺害鍜屽搴﹀彲浠ユ敼涓烘牴鎹?瀵艰埅鏍忓搴?鍜?navitemnum 璁＄畻鍑烘潵,浣嗘槸瀵逛簬涓嶅悓灏哄鐨勪笉濂藉鐞?            g.navwidth = opts.navwidth;
            g.navheight = opts.navheight;
            g.navborder = opts.navborder;
            g.navitemmargin = opts.navitemmargin;
            g.navitemnum = opts.navitemnum;
            g.autoplay = opts.autoplay;
            g.autoplaytimeout = opts.autoplaytimeout;

            images = exzoom_img_box.find("img");
            imgnum = images.length;//鍥剧墖鐨勬暟閲?            checkloadedallimages(images)//妫€鏌ュ浘鐗囨槸鍚﹀仴鍦ㄥ畬鎴?鍏ㄩ儴鍔犺浇瀹屾垚鐨勪細鎵ц鍒濆鍖?        },
        prev: function () {             //涓婁竴寮犲浘鐗?            moveleft()
        },
        next: function () {            //涓嬩竴寮犲浘鐗?            moveright();
        },
        setimg: function () {            //璁剧疆澶у浘
            let url = arguments[0];

            getimagesize(url, function (width, height) {
                exzoom_preview_img.attr("src", url);
                exzoom_main_img.attr("src", url);

                //todo 鏈祴璇?                //鍒ゆ柇宸叉湁鐨勫浘鐗囨暟閲忔槸鍚﹀悎鏈€鍒濈殑涓€鑷?涓嶆槸鐨勮瘽灏卞厛鍒犻櫎鏈€鍚庝竴涓?                if (exzoom_img_ul.find("li").length === imgnum + 1) {
                    exzoom_img_ul.find("li:last").remove();
                }
                exzoom_img_ul.append('<li style="width: ' + boxwidth + 'px;">' +
                    '<img src="' + url + '"></li>');

                let image_prop = copute_image_prop(url, width, height);
                previewimg(image_prop);
            });
        },
    };

    $.fn.extend({
        "exzoom": function (method, options) {
            if (arguments.length === 0 || (typeof method === 'object' && !options)) {
                if (this.length === 0) {
                    // alert("璋冪敤 jquery.exzomm 鏃剁殑閫夋嫨鍣ㄤ负绌?);
                    $.error('selector is empty when call jquery.exzomm');
                } else {
                    return methods.init.apply(this, arguments);
                }
            } else if (methods[method]) {
                return methods[method].apply(this, array.prototype.slice.call(arguments, 1));
            } else {
                // alert("璋冪敤浜?jquery.exzomm 涓笉瀛樺湪鐨勬柟娉?);
                $.error('method ' + method + 'does not exist on jquery.exzomm');
            }
        }
    });

    /**
     * 鍒濆鍖?     */
    function init() {
        exzoom_img_box.append("<div class='exzoom_img_ul_outer'></div>");
        exzoom_nav.append("<p class='exzoom_nav_inner'></p>");
        exzoom_img_ul_outer = exzoom_img_box.find(".exzoom_img_ul_outer");
        exzoom_nav_inner = exzoom_nav.find(".exzoom_nav_inner");

        //鎶?exzoom_img_ul 绉诲姩鍒?exzoom_img_ul_outer 閲?        exzoom_img_ul_outer.append(exzoom_img_ul);

        //寰幆鎵€鏈夊浘鐗?璁＄畻灏哄,娣诲姞缂╃暐鍥惧鑸?        for (let i = 0; i < imgnum; i++) {
            imgarr[i] = copute_image_prop(images.eq(i));//璁板綍鍥剧墖鐨勫昂瀵稿睘鎬х瓑
            console.log(imgarr[i]);
            let li = exzoom_img_ul.find("li").eq(i);
            li.css("width", boxwidth);//璁剧疆鍥剧墖涓婄骇鐨?li 鍏冪礌鐨勫搴?            li.find("img").css({
                "margin-top": imgarr[i][5],
                "width": imgarr[i][3]
            });
        }

        //缂╃暐鍥惧鑸?        exzoom_navspan = exzoom_nav.find("span");
        navheightwithborder = g.navborder * 2 + g.navheight;
        g.exzoom_navwidth = (navheightwithborder + g.navitemmargin) * g.navitemnum;
        g.exzoom_nav_innerwidth = (navheightwithborder + g.navitemmargin) * imgnum;

        exzoom_navspan.eq(imgindex).addclass(navhightclass);
        exzoom_nav.css({
            "height": navheightwithborder + "px",
            "width": boxwidth - exzoom_prev_btn.width() - exzoom_next_btn.width(),
        });
        exzoom_nav_inner.css({
            "width": g.exzoom_nav_innerwidth + "px"
        });
        exzoom_navspan.css({
            "margin-left": g.navitemmargin + "px",
            "width": g.navwidth + "px",
            "height": g.navheight + "px",
        });

        //璁剧疆婊氬姩鍖哄煙鐨勫搴?        exzoom_img_ul_width = boxwidth * imgnum;
        exzoom_img_ul_max_margin = boxwidth * (imgnum - 1);
        exzoom_img_ul.css("width", exzoom_img_ul_width);
        //娣诲姞鏀惧ぇ闀?        exzoom_img_box.append(`
<div class='exzoom_zoom_outer'>
    <span class='exzoom_zoom'></span>
</div>
<p class='exzoom_preview'>
    <img class='exzoom_preview_img' src='' />
</p>
            `);
        exzoom_zoom = exzoom_img_box.find(".exzoom_zoom");
        exzoom_main_img = exzoom_img_box.find(".exzoom_main_img");
        exzoom_zoom_outer = exzoom_img_box.find(".exzoom_zoom_outer");
        exzoom_preview = exzoom_img_box.find(".exzoom_preview");
        exzoom_preview_img = exzoom_img_box.find(".exzoom_preview_img");

        //璁剧疆澶у浘鍜岄瑙堝浘鍖哄煙
        exzoom_img_box.css({
            "width": boxheight + "px",
            "height": boxheight + "px",
        });

        exzoom_img_ul_outer.css({
            "width": boxheight + "px",
            "height": boxheight + "px",
        });

        exzoom_preview.css({
            "width": boxheight + "px",
            "height": boxheight + "px",
            "left": boxheight + 5 + "px",//娣诲姞涓竟璺?        });

        previewimg(imgarr[imgindex]);
        autoplay();//鑷姩鎾斁
        bindingevent();//缁戝畾浜嬩欢
    }

    /**
     * 妫€娴嬪浘鐗囨槸鍚﹀姞杞藉畬鎴?     * @param images
     */
    function checkloadedallimages(images) {
        let timer = setinterval(function () {
            let loaded_images_counter = 0;
            let all_images_num = images.length;
            images.each(function () {
                if (this.complete) {
                    loaded_images_counter++;
                }
            });
            if (loaded_images_counter === all_images_num) {
                clearinterval(timer);
                init();
            }
        }, 100)
    }

    /**
     * 鑾峰彇鍏夋爣鍧愭爣,濡傛灉鏄?touch 浜嬩欢,鍙鐞嗙涓€涓?     */
    function getcursorcoords(event) {
        let e = event || window.event;
        let coords_data = e, //璁板綍鍧愭爣鐨勬暟鎹?榛樿涓?event 鏈韩,绉诲姩绔殑 touch 浼氫慨鏀?            x,//x 杞?            y;//y 杞?
        if (e["touches"] !== undefined) {
            if (e["touches"].length > 0) {
                coords_data = e["touches"][0];
            }
        }

        x = coords_data.clientx || coords_data.pagex;
        y = coords_data.clienty || coords_data.pagey;

        return {'x': x, 'y': y}
    }

    /**
     * 妫€鏌ョщ鍔ㄧ瑙︽懜婊戝姩鐨勪綅缃?     */
    function checknewpositionlimit(new_position) {
        if (-new_position > exzoom_img_ul_max_margin) {
            //闄愬埗鍚戝彸鐨勮寖鍥?            new_position = -exzoom_img_ul_max_margin;
            imgindex = 0;//鍚戝彸瓒呭嚭鑼冨洿鐨勫洖鍒扮涓€涓?        } else if (new_position > 0) {
            //闄愬埗鍚戝乏鐨勮寖鍥?            new_position = 0;
        }
        return new_position
    }

    /**
     * 缁戝畾鍚勭浜嬩欢
     */
    function bindingevent() {
        //绉诲姩绔ぇ鍥惧尯鍩熺殑 touchend 浜嬩欢
        exzoom_img_ul.on("touchstart", function (event) {
            let coords = getcursorcoords(event);
            startx = coords.x;
            starty = coords.y;

            let left = exzoom_img_ul.css("left");
            exzoom_img_ul_position = parseint(left);

            window.clearinterval(autoplayinterval);//鍋滄鑷姩鎾斁
        });

        //绉诲姩绔ぇ鍥惧尯鍩熺殑 touchmove 浜嬩欢
        exzoom_img_ul.on("touchmove", function (event) {
            let coords = getcursorcoords(event);
            let new_position;
            endx = coords.x;
            endy = coords.y;

            //鍙窡闅忓厜鏍囩щ鍔?            new_position = exzoom_img_ul_position + endx - startx;
            new_position = checknewpositionlimit(new_position);
            exzoom_img_ul.css("left", new_position);

        });

        //绉诲姩绔ぇ鍥惧尯鍩熺殑 touchend 浜嬩欢
        exzoom_img_ul.on("touchend", function (event) {
            //瑙﹀睆婊戝姩,鏍规嵁绉诲姩鏂瑰悜鎸夊€嶆暟瀵归綈鍏冪礌
            console.log(endx < startx);
            if (endx < startx) {
                //鍚戝乏婊戝姩
                moveright();
            } else if (endx > startx) {
                //鍚戝彸婊戝姩
                moveleft();
            }

            autoplay();//鎭㈠鑷姩鎾斁
        });

        //澶у睆骞曞湪鏀惧ぇ鍖哄煙鐐瑰嚮,鍒ゆ柇鍚戝乏杩樻槸鍚戝彸绉诲姩
        exzoom_zoom_outer.on("mousedown", function (event) {
            let coords = getcursorcoords(event);
            startx = coords.x;
            starty = coords.y;

            let left = exzoom_img_ul.css("left");
            exzoom_img_ul_position = parseint(left);
        });

        exzoom_zoom_outer.on("mouseup", function (event) {
            let offset = ele.offset();

            if (startx - offset.left < boxwidth / 2) {
                //鍦ㄦ斁澶ч暅鐨勫乏鍗婇儴鍒嗙偣鍑?                moveleft();
            } else if (startx - offset.left > boxwidth / 2) {
                //鍦ㄦ斁澶ч暅鐨勫彸鍗婇儴鍒嗙偣鍑?                moveright();
            }
        });

        //杩涘叆 exzoom 鍋滄鑷姩鎾斁
        ele.on("mouseenter", function () {
            window.clearinterval(autoplayinterval);//鍋滄鑷姩鎾斁
        });
        //绂诲紑 exzoom 寮€濮嬭嚜鍔ㄦ挱鏀?        ele.on("mouseleave", function () {
            autoplay();//鎭㈠鑷姩鎾斁
        });

        //澶у睆骞曡繘鍏ュぇ鍥惧尯鍩?        exzoom_zoom_outer.on("mouseenter", function () {
            exzoom_zoom.css("display", "block");
            exzoom_preview.css("display", "block");
        });

        //澶у睆骞曞湪澶у浘鍖哄煙绉诲姩
        exzoom_zoom_outer.on("mousemove", function (e) {
            let width_limit = exzoom_zoom.width() / 2,
                max_x = exzoom_zoom_outer.width() - width_limit,
                max_y = exzoom_zoom_outer.height() - width_limit,
                current_x = e.pagex - exzoom_zoom_outer.offset().left,
                current_y = e.pagey - exzoom_zoom_outer.offset().top,
                move_x = current_x - width_limit,
                move_y = current_y - width_limit;

            if (current_x <= width_limit) {
                move_x = 0;
            }
            if (current_x >= max_x) {
                move_x = max_x - width_limit;
            }
            if (current_y <= width_limit) {
                move_y = 0;
            }
            if (current_y >= max_y) {
                move_y = max_y - width_limit;
            }
            exzoom_zoom.css({"left": move_x + "px", "top": move_y + "px"});

            exzoom_preview_img.css({
                "left": -move_x * exzoom_preview.width() / exzoom_zoom.width() + "px",
                "top": -move_y * exzoom_preview.width() / exzoom_zoom.width() + "px"
            });
        });

        //澶у睆骞曠寮€澶у浘鍖哄煙
        exzoom_zoom_outer.on("mouseleave", function () {
            exzoom_zoom.css("display", "none");
            exzoom_preview.css("display", "none");
        });

        //澶у睆骞曞厜瀹濊繘鍏ユ斁澶ч瑙堝尯鍩?        exzoom_preview.on("mouseenter", function () {
            exzoom_zoom.css("display", "none");
            exzoom_preview.css("display", "none");
        });

        //缂╃暐鍥惧鑸?        exzoom_next_btn.on("click", function () {
            moveright();
        });
        exzoom_prev_btn.on("click", function () {
            moveleft();
        });

        exzoom_navspan.hover(function () {
            imgindex = $(this).index();
            move(imgindex);
        });
    }

    /**
     * 鑱氱劍鍦ㄥ鑸浘鐗囦笂,宸﹀彸绉诲姩閮戒細璋冪敤
     * @param direction: 鏂瑰悜,right | left,蹇呭～
     */
    function move(direction) {
        if (typeof direction === "undefined") {
            alert("exzoom 涓殑 move 鍑芥暟鐨?direction 鍙傛暟蹇呭～");
        }
        //濡傛灉瓒呭嚭鍥剧墖鏁伴噺浜?杩斿洖绗竴寮?        if (imgindex > imgarr.length - 1) {
            imgindex = 0;
        }

        //璁剧疆楂樹寒
        exzoom_navspan.eq(imgindex).addclass(navhightclass).siblings().removeclass(navhightclass);

        //鍒ゆ柇缂╃暐鍥惧鑸槸鍚﹂渶瑕侀噸鏂拌缃亸绉婚噺
        let exzoom_nav_width = exzoom_nav.width();
        let nav_item_width = g.navitemmargin + g.navwidth + g.navborder * 2; // 鍗曚釜瀵艰埅鍏冪礌鐨勫搴?        let new_nav_offset = 0;

        //鐩存帴瀵规瘮褰撳墠绱㈠紩鐨勫浘鐗囧崰鎹殑瀹藉害鍜宔xzoom鐨勫搴︾殑宸綔涓哄亸绉婚噺鍗冲彲
        let temp = nav_item_width * (imgindex + 1);
        if (temp > exzoom_nav_width) {
            new_nav_offset =  boxwidth - temp;
        }

        exzoom_nav_inner.css({
            "left": new_nav_offset
        });

        //鍒囨崲澶у浘
        let new_position = -boxwidth * imgindex;
        //鍦?animate 鏂规硶鍓嶅厛璋冪敤 stop() ,閬垮厤鍙嶅簲杩熼挐
        new_position = checknewpositionlimit(new_position);
        exzoom_img_ul.stop().animate({"left": new_position}, 500);
        //澶勭悊鏀惧ぇ鍖哄煙
        previewimg(imgarr[imgindex]);
    }

    /**
     * 瀵艰埅鍚戝彸
     */
    function moveright() {
        imgindex++;//鍏堝鍔?index,鍚庨潰鍒ゆ柇鑼冨洿
        if (imgindex > imgnum) {
            imgindex = imgnum;
        }
        move("right");
    }

    /**
     * 瀵艰埅鍚戝乏
     */
    function moveleft() {
        imgindex--;//鍏堝噺灏?index,鍚庨潰鍒ゆ柇鑼冨洿
        if (imgindex < 0) {
            imgindex = 0;
        }
        move("left");
    }

    /**
     * 鑷姩鎾斁
     */
    function autoplay() {
        if (g.autoplay) {
            autoplayinterval = window.setinterval(function () {
                if (imgindex >= imgnum) {
                    imgindex = 0;
                }
                imgindex++;
                move("right");
            }, g.autoplaytimeout);
        }
    }

    /**
     * 棰勮鍥剧墖
     */
    function previewimg(image_prop) {
        if (image_prop === undefined) {
            return
        }
        exzoom_preview_img.attr("src", image_prop[0]);

        exzoom_main_img.attr("src", image_prop[0])
            .css({
                "width": image_prop[3] + "px",
                "height": image_prop[4] + "px"
            });
        exzoom_zoom_outer.css({
            "width": image_prop[3] + "px",
            "height": image_prop[4] + "px",
            "top": image_prop[5] + "px",
            "left": image_prop[6] + "px",
            "position": "relative"
        });
        exzoom_zoom.css({
            "width": image_prop[7] + "px",
            "height": image_prop[7] + "px"
        });
        exzoom_preview_img.css({
            "width": image_prop[8] + "px",
            "height": image_prop[9] + "px"
        });
    }

    /**
     * 鑾峰緱鍥剧墖鐨勭湡瀹炲昂瀵?     * @param url
     * @param callback
     */
    function getimagesize(url, callback) {
        let img = new image();
        img.src = url;

        // 濡傛灉鍥剧墖琚紦瀛橈紝鍒欑洿鎺ヨ繑鍥炵紦瀛樻暟鎹?        if (typeof callback !== "undefined") {
            if (img.complete) {
                callback(img.width, img.height);
            } else {
                // 瀹屽叏鍔犺浇瀹屾瘯鐨勪簨浠?                img.onload = function () {
                    callback(img.width, img.height);
                }
            }
        } else {
            return {
                width: img.width,
                height: img.height
            }
        }
    }

    /**
     * 璁＄畻鍥剧墖灞炴€?     * @param image : jquery 瀵硅薄鎴?鍥剧墖url鍦板潃
     * @param width : image 涓哄浘鐗噓rl鍦板潃鏃舵寚瀹氬搴?     * @param height : image 涓哄浘鐗噓rl鍦板潃鏃舵寚瀹氶珮搴?     * @returns {array}
     */
    function copute_image_prop(image, width, height) {
        let src;
        let res = [];

        if (typeof image === "string") {
            src = image;
        } else {
            src = image.attr("src");
            let size = getimagesize(src);
            width = size.width;
            height = size.height;
        }

        res[0] = src;
        res[1] = width;
        res[2] = height;
        let img_scale = res[1] / res[2];

        if (img_scale === 1) {
            res[3] = boxheight;//width
            res[4] = boxheight;//height
            res[5] = 0;//top
            res[6] = 0;//left
            res[7] = boxheight / 2;
            res[8] = boxheight * 2;//width
            res[9] = boxheight * 2;//height
            exzoom_nav_inner.append(`<span><img src="${src}" width="${g.navwidth }" height="${g.navheight }"/></span>`);
        } else if (img_scale > 1) {
            res[3] = boxheight;//width
            res[4] = boxheight / img_scale;
            res[5] = (boxheight - res[4]) / 2;
            res[6] = 0;//left
            res[7] = res[4] / 2;
            res[8] = boxheight * 2 * img_scale;//width
            res[9] = boxheight * 2;//height
            let top = (g.navheight - (g.navwidth / img_scale)) / 2;
            exzoom_nav_inner.append(`<span><img src="${src}" width="${g.navwidth }" style='top:${top}px;' /></span>`);
        } else if (img_scale < 1) {
            res[3] = boxheight * img_scale;//width
            res[4] = boxheight;//height
            res[5] = 0;//top
            res[6] = (boxheight - res[3]) / 2;
            res[7] = res[3] / 2;
            res[8] = boxheight * 2;//width
            res[9] = boxheight * 2 / img_scale;
            let top = (g.navwidth - (g.navheight * img_scale)) / 2;
            exzoom_nav_inner.append(`<span><img src="${src}" height="${g.navheight}" style="left:${top}px;"/></span>`);
        }

        return res;
    }

// 闂寘缁撴潫     
})(jquery, window);