/*分页插件*/
var Pagination = {

    showPageCount: 7,

    init: function (obj, callback,topFlag) {
        this.bindListener(obj, callback,topFlag);
    },
    createHtml: function (pageIndex, recordCount, pageSize) {

        var pageCount = Math.ceil(recordCount / pageSize);  //总页数
        var showPageCount = this.showPageCount;
        var MaxCount = 10000000000;
        var HalfPageCount = (showPageCount + 1) / 2;
        var html = [];

        if (pageCount > MaxCount) {
            pageCount = MaxCount;
        }
        if (pageIndex > pageCount - 1) {
            pageIndex = pageCount - 1;
        }
        html.push("<span class=\"total\">共" + recordCount + "条</span>");
        if (pageIndex > 0) {
            html.push("<span class=\"previous\"><a href=\"javascript:;\" page= " + (pageIndex - 1) + " data-rec=\"上一页\"></a></span>");
        }
        else {
            html.push("<span class=\"disable previous\"></span>");
        }
        if (pageCount <= showPageCount) {
            for (var i = 0; i < pageCount; i++) {
                if (pageIndex == i) {
                    html.push("<span class=\"current num\">" + (i + 1) + "</span>");
                }
                else {
                    html.push("<span class=\"num\"><a href=\"javascript:;\"  page=" + i + ">" + (i + 1) + "</a></span>");
                }
            }
        }
        else if (pageIndex < HalfPageCount) {
            for (var i = 0; i < showPageCount - 1; i++) {
                if (pageIndex == i) {
                    html.push("<span class=\"current num\">" + (i + 1) + "</span>");
                }
                else {
                    html.push("<span class=\"num\"><a href=\"javascript:;\"  page=" + i + ">" + (i + 1) + "</a></span>");
                }
            }

            html.push("<span class=\"dots\">...</span>");
            html.push("<span class=\"num\"><a href=\"javascript:;\"  page=" + (pageCount - 1) + ">" + pageCount + "</a></span>");
        }
        else if (pageIndex >= pageCount - HalfPageCount - 1) {
            html.push("<span class=\"num\"><a href=\"javascript:;\" page='0'>" + 1 + "</a></span>");
            html.push("<span class=\"dots\">...</span>");
            for (var i = pageCount - showPageCount + 1; i < pageCount; i++) {
                if (pageIndex == i) {
                    html.push("<span class=\"current num\">" + (i + 1) + "</span>");
                }
                else {
                    html.push("<span class=\"num\"><a href=\"javascript:;\" page=" + i + ">" + (i + 1) + "</a></span>");
                }
            }
        }
        else {
            html.push("<span class=\"num\"><a href=\"javascript:;\" page=0>" + 1 + "</a></span>");
            html.push("<span class=\"dots\">...</span>");

            for (var i = pageIndex - HalfPageCount / 2; i <= pageIndex + HalfPageCount / 2; i++) {
                if (pageIndex == i) {
                    html.push("<span class=\"current num\">" + (i + 1) + "</span>");
                }
                else {
                    html.push("<span class=\"num\"><a href=\"javascript:;\" page=" + i + ">" + (i + 1) + "</a></span>");
                }
            }
            html.push("<span class=\"dots\">...</span>");
            html.push("<span class=\"num\"><a href=\"javascript:;\" page =" + (pageCount - 1) + ">" + pageCount + "</a></span>");
        }

        if (pageIndex < pageCount - 1) {
            html.push("<span class=\"next\"><a href=\"javascript:;\" page=" + (pageIndex + 1) + " data-rec=\"下一页\"></a></span>");
        }
        else {
            html.push("<span class=\"disable next\"></span>");
        }

        // html.push("<span class=\"total\">每页" + pageSize + "条</span>");
        html.push("<span class=\"total total_page\">共" + pageCount + "页</span>");
        html.push("<span class=\"page_jump\">到</span><input id='pageInput' class='pageInput' oldpage='' maxlength='" + pageCount + "' type='text' ><span class=\"page_jump\">页</span><button type='button' id='pagebtn' class='pagebtn'>确定</button>");

        // html.push("<script>pagination(" + pageCount + ",$('#pageInput'), $('#pagebtn'));</script>");
        console.log(pageCount);
        console.log(showPageCount);
        console.log(HalfPageCount);
        return html.join("");
    },

    bindListener: function (obj, callback,topFlag) {
        var topFlag = topFlag || true;
        obj.on("click", "a", function () {
            if (typeof callback === "function") {
                var index = $(this).attr("page");
                callback(parseInt(index));
            }
            if(topFlag){
                $(window).scrollTop(0);
            }
            return false;
        });
        obj.on("click", "button", function () {
            var pageInput = obj.find('input');
            if (typeof callback === "function") {
                var index = pageInput.val();
                if (index == '') {
                    pageInput.focus();
                    return false;
                    // index = 1;
                }
                callback(parseInt(index) - 1);
            }
            return false;
        });

        // var pageButton = $("#pageButton");

        obj.on("keyup", "input", function (e) {

            switch (e.keyCode) {
                case 37:
                    break;
                case 38:
                    break;
                case 39:
                    break;
                case 40:
                    break;
                case 13:
                    changePage();
                    break;
                case 8:
                    $(e.target).attr('oldpage', $(e.target).val());
                    break;
                case 46:
                    $(e.target).attr('oldpage', $(e.target).val());
                    break;
                default :
                    validPage();
            }
            return false;
        });

        //分页
        function changePage() {
            var pageInput = obj.find('input');
            var page = pageInput.val();
            var maxPage = parseInt(obj.find(".total_page").html().substring(1));
            var pattern = new RegExp("^[1-9]\\d{0," + maxPage.toString().length + "}$");
            if (page.trim() == "") {
                pageInput.focus();
                return;
            }
            if (pattern.test(page)) {
                page = parseInt(page);
                maxPage = parseInt(maxPage);
                if (page > maxPage || page < 0) {
                    pageInput.val("").focus();
                    return;
                }
            } else {

                pageInput.val("").focus();
                return;
            }
            callback(parseInt(page) - 1);
        }

        //页码校验v2
        function validPage() {
            var pageInput = obj.find('input');

            var totalPageHtml = obj.find(".total_page").html();
            var maxPage = parseInt(totalPageHtml.substring(1, totalPageHtml.length - 1));

            var page = pageInput.val();
            var pattern = /^[0-9]+$/;
            var oldpage = pageInput.attr("oldpage") || '';
            if (page.trim() == "") {
                pageInput.val("");
                return;
            }
            if (!pattern.test(page)) {
                pageInput.val(oldpage);
                return;
            }
            var pageInt = parseInt(page);
            if (page.substr(0, 1) == '0') {
                pageInput.val(pageInt);
            }
            if (pageInt == 0) {
                pageInput.val('');
                return;
            }
            if (pageInt > parseInt(maxPage)) {
                pageInput.val(page.substr(0, page.length - 1));
                return;
            }
            pageInput.attr('oldpage', pageInput.val());
        }
    },
    Page: function (obj, pageIndex, recordCount, pageSize) {
        obj.empty();
        obj.html(this.createHtml(pageIndex, recordCount, pageSize));
    }

};