/*!
 * jq-paginator v2.0.2
 * http://jqpaginator.keenwon.com
 */

(function () {
    'use strict';

    /* eslint-env jquery */

    var $ = jquery;

    $.jqpaginator = function (el, options) {
        if (!(this instanceof $.jqpaginator)) {
            return new $.jqpaginator(el, options)
        }

        var self = this;

        self.$container = $(el);

        self.$container.data('jqpaginator', self);

        self.init = function () {
            if (options.first || options.prev || options.next || options.last || options.page) {
                options = $.extend(
                    {},
                    {
                        first: '',
                        prev: '',
                        next: '',
                        last: '',
                        page: ''
                    },
                    options
                );
            }

            self.options = $.extend({}, $.jqpaginator.defaultoptions, options);

            self.verify();

            self.extendjquery();

            self.render();

            self.fireevent(this.options.currentpage, 'init');
        };

        self.verify = function () {
            var opts = self.options;

            if (!self.isnumber(opts.totalpages)) {
                throw new error('[jqpaginator] type error: totalpages')
            }

            if (!self.isnumber(opts.totalcounts)) {
                throw new error('[jqpaginator] type error: totalcounts')
            }

            if (!self.isnumber(opts.pagesize)) {
                throw new error('[jqpaginator] type error: pagesize')
            }

            if (!self.isnumber(opts.currentpage)) {
                throw new error('[jqpaginator] type error: currentpage')
            }

            if (!self.isnumber(opts.visiblepages)) {
                throw new error('[jqpaginator] type error: visiblepages')
            }

            if (!opts.totalpages && !opts.totalcounts) {
                throw new error('[jqpaginator] totalcounts or totalpages is required')
            }

            if (!opts.totalpages && opts.totalcounts && !opts.pagesize) {
                throw new error('[jqpaginator] pagesize is required')
            }

            if (opts.totalcounts && opts.pagesize) {
                opts.totalpages = math.ceil(opts.totalcounts / opts.pagesize);
            }

            if (opts.currentpage < 1 || opts.currentpage > opts.totalpages) {
                throw new error('[jqpaginator] currentpage is incorrect')
            }

            if (opts.totalpages < 1) {
                throw new error('[jqpaginator] totalpages cannot be less currentpage')
            }
        };

        self.extendjquery = function () {
            $.fn.jqpaginatorhtml = function (s) {
                return s
                    ? this.before(s).remove()
                    : $('<p>')
                        .append(this.eq(0).clone())
                        .html()
            };
        };

        self.render = function () {
            self.renderhtml();
            self.setstatus();
            self.bindevents();
        };

        self.renderhtml = function () {
            var html = [];

            var pages = self.getpages();
            for (var i = 0, j = pages.length; i < j; i++) {
                html.push(self.builditem('page', pages[i]));
            }

            self.isenable('prev') && html.unshift(self.builditem('prev', self.options.currentpage - 1));
            self.isenable('first') && html.unshift(self.builditem('first', 1));
            self.isenable('statistics') && html.unshift(self.builditem('statistics'));
            self.isenable('next') && html.push(self.builditem('next', self.options.currentpage + 1));
            self.isenable('last') && html.push(self.builditem('last', self.options.totalpages));
            // html.push("<li style='margin-left: 20px' class=\"last\" jp-role=\"last\" jp-data=\"3\"><a href=\"javascript:void(0);\">共" + self.options.totalpages + "页" + self.options.totalcounts + "条</a></li>")

            if (self.options.wrapper) {
                self.$container.html(
                    $(self.options.wrapper)
                        .html(html.join(''))
                        .jqpaginatorhtml()
                );
            } else {
                self.$container.html(html.join(''));
            }
        };

        self.builditem = function (type, pagedata) {
            var html = self.options[type]
                .replace(/{{page}}/g, pagedata)
                .replace(/{{totalpages}}/g, self.options.totalpages)
                .replace(/{{totalcounts}}/g, self.options.totalcounts);

            return $(html)
                .attr({
                    'jp-role': type,
                    'jp-data': pagedata
                })
                .jqpaginatorhtml()
        };

        self.setstatus = function () {
            var options = self.options;

            if (!self.isenable('first') || options.currentpage === 1) {
                $('[jp-role=first]', self.$container).addclass(options.disableclass);
            }
            if (!self.isenable('prev') || options.currentpage === 1) {
                $('[jp-role=prev]', self.$container).addclass(options.disableclass);
            }
            if (!self.isenable('next') || options.currentpage >= options.totalpages) {
                $('[jp-role=next]', self.$container).addclass(options.disableclass);
            }
            if (!self.isenable('last') || options.currentpage >= options.totalpages) {
                $('[jp-role=last]', self.$container).addclass(options.disableclass);
            }

            $('[jp-role=page]', self.$container).removeclass(options.activeclass);
            $('[jp-role=page][jp-data=' + options.currentpage + ']', self.$container).addclass(options.activeclass);
        };

        self.getpages = function () {
            var pages = [];

            var visiblepages = self.options.visiblepages;

            var currentpage = self.options.currentpage;

            var totalpages = self.options.totalpages;

            if (visiblepages > totalpages) {
                visiblepages = totalpages;
            }

            var half = math.floor(visiblepages / 2);
            var start = currentpage - half + 1 - (visiblepages % 2);
            var end = currentpage + half;

            if (start < 1) {
                start = 1;
                end = visiblepages;
            }
            if (end > totalpages) {
                end = totalpages;
                start = 1 + totalpages - visiblepages;
            }

            var itpage = start;
            while (itpage <= end) {
                pages.push(itpage);
                itpage++;
            }

            return pages
        };

        self.isnumber = function (value) {
            var type = typeof value;
            return type === 'number' || type === 'undefined'
        };

        self.isenable = function (type) {
            return self.options[type] && typeof self.options[type] === 'string'
        };

        self.switchpage = function (pageindex) {
            self.options.currentpage = pageindex;
            self.render();
        };

        self.fireevent = function (pageindex, type) {
            return typeof self.options.onpagechange !== 'function' || self.options.onpagechange(pageindex, type) !== false
        };

        self.callmethod = function (method, options) {
            switch (method) {
                case 'option':
                    self.options = $.extend({}, self.options, options);
                    self.verify();
                    self.render();
                    break
                case 'destroy':
                    self.$container.empty();
                    self.$container.removedata('jqpaginator');
                    break
                default:
                    throw new error('[jqpaginator] method "' + method + '" does not exist')
            }

            return self.$container
        };

        self.bindevents = function () {
            var opts = self.options;

            self.$container.off();
            self.$container.on('click', '[jp-role]', function () {
                var $el = $(this);
                if ($el.hasclass(opts.disableclass) || $el.hasclass(opts.activeclass)) {
                    return
                }

                var pageindex = +$el.attr('jp-data');
                if (self.fireevent(pageindex, 'change')) {
                    self.switchpage(pageindex);
                }
            });
        };

        self.init();

        return self.$container
    };

    $.jqpaginator.defaultoptions = {
        wrapper: '',
        first: '<li class="first"><a href="javascript:;">first</a></li>',
        prev: '<li class="prev"><a href="javascript:;">previous</a></li>',
        next: '<li class="next"><a href="javascript:;">next</a></li>',
        last: '<li class="last"><a href="javascript:;">last</a></li>',
        page: '<li class="page"><a href="javascript:;">{{page}}</a></li>',
        totalpages: 0,
        totalcounts: 0,
        pagesize: 0,
        currentpage: 1,
        visiblepages: 7,
        disableclass: 'disabled',
        activeclass: 'active',
        onpagechange: null
    };

    $.fn.jqpaginator = function () {
        var self = this;

        var args = array.prototype.slice.call(arguments);

        if (typeof args[0] === 'string') {
            var $instance = $(self).data('jqpaginator');
            if (!$instance) {
                throw new error('[jqpaginator] the element is not instantiated')
            } else {
                return $instance.callmethod(args[0], args[1])
            }
        } else {
            return new $.jqpaginator(this, args[0])
        }
    };

}());