/**
 * 分页插件
 * 使用方法：
 * 初始化
 * $('#pagination').page({
 *      totalpage:100, //总页数
 *      onchange:function (page) {  //callback
 *          console.log(page)
 *      }
 *  })
 *  修改总页数
 *  $('#pagination').changetotalpage(50) number
 */


(function ($) {
    var defaults = {
        totalpage: 10,
        current: 1,
        onchange: function () {

        }
    };
    var opts, myoptions;
    $.fn.extend({
        page: function (options) {
            myoptions = options;
            opts = $.extend(defaults, options);
            var $this = $(this);
            return this.each(function () {
                var self = $(this);
                var page = '';
                var plength = opts.totalpage;
                var nowpage = opts.current;

                if (plength > 0 && plength <= 8) {
                    for (var i = 1; i <= plength; i++) {
                        page += '<li data-no="' + i + '" class="page' + i + '"><a>' + i + '</a></li>';
                    }
                } else {
                    if (nowpage <= 3) {
                        for (var i = 1; i <= 5; i++) {
                            page += '<li data-no="' + i + '" class="page' + i + '"><a>' + i + '</a></li>';
                        }
                        if (nowpage + 5 >= plength) {
                            page += '<li data-no="' + plength + '" class="jumpnext"><a>...</a></li>';
                        } else {
                            page += '<li data-no="' + (nowpage + 5) + '" class="jumpnext"><a>...</a></li>';
                        }
                        page += '<li  data-no="' + plength + '" class="page' + plength + '"><a>' + plength + '</a></li>';
                    } else if (nowpage == 4) {
                        for (var i = 1; i <= 6; i++) {
                            page += '<li data-no="' + i + '"  class="page' + i + '"><a>' + i + '</a></li>';
                        }
                        if (nowpage + 5 >= plength) {
                            page += '<li data-no="' + plength + '" class="jumpnext"><a>...</a></li>';
                        } else {
                            page += '<li data-no="' + (nowpage + 5) + '" class="jumpnext"><a>...</a></li>';
                        }
                        page += '<li data-no="' + plength + '"  class="page' + plength + '"><a>' + plength + '</a></li>';
                    } else if (nowpage >= plength - 3) {
                        page += '<li data-no="1" class="page1"><a>1</a></li>';
                        if (nowpage - 5 <= 0) {
                            page += '<li data-no="1" class="jumpprev"><a>...</a></li>';
                        } else {
                            page += '<li data-no="' + (nowpage - 5) + '" class="jumpprev"><a>...</a></li>';
                        }
                        for (var i = plength - 4; i <= plength; i++) {
                            page += '<li data-no="' + i + '" class="page' + i + '"><a>' + i + '</a></li>';
                        }
                    }
                    else {
                        page += '<li data-no="1" class="page1"><a>1</a></li>';
                        if (nowpage - 5 <= 0) {
                            page += '<li data-no="1" class="jumpprev"><a>...</a></li>';
                        } else {
                            page += '<li data-no="' + (nowpage - 5) + '" class="jumpprev"><a>...</a></li>';
                        }
                        for (var i = nowpage - 2; i <= nowpage + 2; i++) {
                            page += '<li data-no="' + i + '" class="page' + i + '"><a>' + i + '</a></li>';
                        }
                        if (nowpage + 5 >= plength) {
                            page += '<li data-no="' + plength + '" class="jumpnext"><a>...</a></li>';
                        } else {
                            page += '<li data-no="' + (nowpage + 5) + '" class="jumpnext"><a>...</a></li>';
                        }
                        page += '<li  data-no="' + plength + '" class="page' + plength + '"><a>' + plength + '</a></li>';
                    }
                }
                self.html('');
                self.unbind();

                var pagehtml = '';

                pagehtml += '<ul><li class="first" data-no="1"><a>first</a></li>';

                if (nowpage - 1 <= 0) {
                    pagehtml += '<li class="pre" data-no="1"><a>pre</a></li>'
                } else {
                    pagehtml += '<li class="pre" data-no="' + (nowpage - 1) + '"><a>pre</a></li>'
                }

                pagehtml += page;

                if (nowpage + 1 >= plength) {
                    pagehtml += '<li class="next"  data-no="' + plength + '"><a>next</a></li>';
                } else {
                    pagehtml += '<li class="next"  data-no="' + (nowpage + 1) + '"><a>next</a></li>';
                }

                pagehtml += '<li class="last" data-no="' + plength + '"><a>last</a></li></ul>';

                self.html(pagehtml);

                self.find('.page' + nowpage).addclass('active').siblings().removeclass('active');


                self.on('click', 'li', function () {
                    var pageno = $(this).data('no');

                    if (nowpage === pageno) {
                        return false;
                    }

                    myoptions.current = pageno;

                    opts.onchange(pageno);

                    $this.page(myoptions)

                })

            })
        },
        changetotalpage: function (number) {
            myoptions.totalpage = number;
            myoptions.current = 1;
            $(this).page(myoptions);
        }
    })
})(jquery);