/**
 * pagination.js 1.5.1
 * a jquery plugin to provide simple yet fully customisable pagination.
 * @version 1.5.1
 * @author mss
 * @url https://github.com/maxiaoxiang/jquery-plugins
 *
 * @调用方法
 * $(selector).pagination(option, callback);
 * -此处callback是初始化调用，option里的callback是点击页码后调用
 * 
 * -- example --
 * $(selector).pagination({
 *     ... // 配置参数
 *     callback: function(api) {
 *         console.log('点击页码调用该回调'); //切换页码时执行一次回调
 *     }
 * }, function(){
 *     console.log('初始化'); //插件初始化时调用该方法，比如请求第一次接口来初始化分页配置
 * });
 */
;
(function (factory) {
    if (typeof define === "function" && (define.amd || define.cmd) && !jquery) {
        // amd或cmd
        define(["jquery"], factory);
    } else if (typeof module === 'object' && module.exports) {
        // node/commonjs
        module.exports = function (root, jquery) {
            if (jquery === undefined) {
                if (typeof window !== 'undefined') {
                    jquery = require('jquery');
                } else {
                    jquery = require('jquery')(root);
                }
            }
            factory(jquery);
            return jquery;
        };
    } else {
        //browser globals
        factory(jquery);
    }
}(function ($) {

    //配置参数
    var defaults = {
        totaldata: 0, //数据总条数
        showdata: 0, //每页显示的条数
        pagecount: 9, //总页数,默认为9
        current: 1, //当前第几页
        prevcls: 'prev', //上一页class
        nextcls: 'next', //下一页class
        prevcontent: '<', //上一页内容
        nextcontent: '>', //下一页内容
        activecls: 'active', //当前页选中状态
        coping: false, //首页和尾页
        ishide: false, //当前页数为0页或者1页时不显示分页
        homepage: '', //首页节点内容
        endpage: '', //尾页节点内容
        keepshowpn: false, //是否一直显示上一页下一页
        mode: 'unfixed', //分页模式，unfixed：不固定页码数量，fixed：固定页码数量
        count: 4, //mode为unfixed时显示当前选中页前后页数，mode为fixed显示页码总数
        jump: false, //跳转到指定页数
        jumpiptcls: 'jump-ipt', //文本框内容
        jumpbtncls: 'jump-btn', //跳转按钮
        jumpbtn: '跳转', //跳转按钮文本
        callback: function () {} //回调
    };

    var pagination = function (element, options) {
        //全局变量
        var opts = options, //配置
            current, //当前页
            $document = $(document),
            $obj = $(element); //容器

        /**
         * 设置总页数
         * @param {int} page 页码
         * @return opts.pagecount 总页数配置
         */
        this.setpagecount = function (page) {
            return opts.pagecount = page;
        };

        /**
         * 获取总页数
         * 如果配置了总条数和每页显示条数，将会自动计算总页数并略过总页数配置，反之
         * @return {int} 总页数
         */
        this.getpagecount = function () {
            return opts.totaldata && opts.showdata ? math.ceil(parseint(opts.totaldata) / opts.showdata) : opts.pagecount;
        };

        /**
         * 获取当前页
         * @return {int} 当前页码
         */
        this.getcurrent = function () {
            return current;
        };

        /**
         * 填充数据
         * @param {int} 页码
         */
        this.filling = function (index) {
            var html = '';
            current = parseint(index) || parseint(opts.current); //当前页码
            var pagecount = this.getpagecount(); //获取的总页数
            switch (opts.mode) { //配置模式
                case 'fixed': //固定按钮模式
                    html += '<a href="javascript:;" class="' + opts.prevcls + '">' + opts.prevcontent + '</a>';
                    if (opts.coping) {
                        var home = opts.coping && opts.homepage ? opts.homepage : '1';
                        html += '<a href="javascript:;" data-page="1">' + home + '</a>';
                    }
                    var start = current > opts.count - 1 ? current + opts.count - 1 > pagecount ? current - (opts.count - (pagecount - current)) : current - 2 : 1;
                    var end = current + opts.count - 1 > pagecount ? pagecount : start + opts.count;
                    for (; start <= end; start++) {
                        if (start != current) {
                            html += '<a href="javascript:;" data-page="' + start + '">' + start + '</a>';
                        } else {
                            html += '<span class="' + opts.activecls + '">' + start + '</span>';
                        }
                    }
                    if (opts.coping) {
                        var _end = opts.coping && opts.endpage ? opts.endpage : pagecount;
                        html += '<a href="javascript:;" data-page="' + pagecount + '">' + _end + '</a>';
                    }
                    html += '<a href="javascript:;" class="' + opts.nextcls + '">' + opts.nextcontent + '</a>';
                    break;
                case 'unfixed': //不固定按钮模式
                    if (opts.keepshowpn || current > 1) { //上一页
                        html += '<a href="javascript:;" class="' + opts.prevcls + '">' + opts.prevcontent + '</a>';
                    } else {
                        if (opts.keepshowpn == false) {
                            $obj.find('.' + opts.prevcls) && $obj.find('.' + opts.prevcls).remove();
                        }
                    }
                    if (current >= opts.count + 2 && current != 1 && pagecount != opts.count) {
                        var home = opts.coping && opts.homepage ? opts.homepage : '1';
                        html += opts.coping ? '<a href="javascript:;" data-page="1">' + home + '</a><span>...</span>' : '';
                    }
                    var start = (current - opts.count) <= 1 ? 1 : (current - opts.count);
                    var end = (current + opts.count) >= pagecount ? pagecount : (current + opts.count);
                    for (; start <= end; start++) {
                        if (start <= pagecount && start >= 1) {
                            if (start != current) {
                                html += '<a href="javascript:;" data-page="' + start + '">' + start + '</a>';
                            } else {
                                html += '<span class="' + opts.activecls + '">' + start + '</span>';
                            }
                        }
                    }
                    if (current + opts.count < pagecount && current >= 1 && pagecount > opts.count) {
                        var end = opts.coping && opts.endpage ? opts.endpage : pagecount;
                        html += opts.coping ? '<span>...</span><a href="javascript:;" data-page="' + pagecount + '">' + end + '</a>' : '';
                    }
                    if (opts.keepshowpn || current < pagecount) { //下一页
                        html += '<a href="javascript:;" class="' + opts.nextcls + '">' + opts.nextcontent + '</a>';
                    } else {
                        if (opts.keepshowpn == false) {
                            $obj.find('.' + opts.nextcls) && $obj.find('.' + opts.nextcls).remove();
                        }
                    }
                    break;
                case 'easy': //简单模式
                    break;
                default:
            }
            html += opts.jump ? '<input type="text" class="' + opts.jumpiptcls + '"><a href="javascript:;" class="' + opts.jumpbtncls + '">' + opts.jumpbtn + '</a>' : '';
            $obj.empty().html(html);
        };

        //绑定事件
        this.eventbind = function () {
            var that = this;
            var pagecount = that.getpagecount(); //总页数
            var index = 1;
            $obj.off().on('click', 'a', function () {
                if ($(this).hasclass(opts.nextcls)) {
                    if ($obj.find('.' + opts.activecls).text() >= pagecount) {
                        $(this).addclass('disabled');
                        return false;
                    } else {
                        index = parseint($obj.find('.' + opts.activecls).text()) + 1;
                    }
                } else if ($(this).hasclass(opts.prevcls)) {
                    if ($obj.find('.' + opts.activecls).text() <= 1) {
                        $(this).addclass('disabled');
                        return false;
                    } else {
                        index = parseint($obj.find('.' + opts.activecls).text()) - 1;
                    }
                } else if ($(this).hasclass(opts.jumpbtncls)) {
                    if ($obj.find('.' + opts.jumpiptcls).val() !== '') {
                        index = parseint($obj.find('.' + opts.jumpiptcls).val());
                    } else {
                        return;
                    }
                } else {
                    index = parseint($(this).data('page'));
                }
                that.filling(index);
                typeof opts.callback === 'function' && opts.callback(that);
            });
            //输入跳转的页码
            $obj.on('input propertychange', '.' + opts.jumpiptcls, function () {
                var $this = $(this);
                var val = $this.val();
                var reg = /[^\d]/g;
                if (reg.test(val)) $this.val(val.replace(reg, ''));
                (parseint(val) > pagecount) && $this.val(pagecount);
                if (parseint(val) === 0) $this.val(1); //最小值为1
            });
            //回车跳转指定页码
            $document.keydown(function (e) {
                if (e.keycode == 13 && $obj.find('.' + opts.jumpiptcls).val()) {
                    var index = parseint($obj.find('.' + opts.jumpiptcls).val());
                    that.filling(index);
                    typeof opts.callback === 'function' && opts.callback(that);
                }
            });
        };

        //初始化
        this.init = function () {
            this.filling(opts.current);
            this.eventbind();
            if (opts.ishide && this.getpagecount() == '1' || this.getpagecount() == '0') {
                $obj.hide();
            } else {
                $obj.show();
            }
        };
        this.init();
    };

    $.fn.pagination = function (parameter, callback) {
        if (typeof parameter == 'function') { //重载
            callback = parameter;
            parameter = {};
        } else {
            parameter = parameter || {};
            callback = callback || function () {};
        }
        var options = $.extend({}, defaults, parameter);
        return this.each(function () {
            var pagination = new pagination(this, options);
            callback(pagination);
        });
    };

}));