class page_helper():

    def __init__(self, count, current_page, per_page_num, base_url,parms):

        self.count = count

        self.current_page = current_page

        self.per_page_num = per_page_num

        self.base_url = base_url

        self.page_head = "<nav aria-label='Page navigation'><ul class='pagination'>"

        self.page_tail = "</ul></nav>"

        import copy

        parms = copy.deepcopy(parms)

        parms._mutable = True

        self.parms = parms

    def page_count(self):

        before, after = divmod(self.count, self.per_page_num)

        if after > 0:

            class_count = before + 1

        else:

            class_count = before

        print("-------------",class_count,self.count,self.per_page_num)

        return class_count

    def page_start(self):

        if self.page_count() <= 11:

            start_int = 1

            end_int = self.page_count()

        else:

            if self.current_page <= 6:

                start_int = 1

                end_int = 11

            elif self.current_page + 5 + 1 > self.page_count():

                start_int = self.page_count() - 10

                end_int = self.page_count() + 1

            else:

                start_int = self.current_page - 5

                end_int = self.current_page + 5 + 1

        return start_int

    def page_end(self):

        if self.page_count() <= 11:

            start_int = 1

            end_int = self.page_count()

        else:

            if self.current_page <= 6:

                start_int = 1

                end_int = 11

            elif self.current_page + 5 + 1 > self.page_count():

                start_int = self.page_count() - 10

                end_int = self.page_count() + 1

            else:

                start_int = self.current_page - 5

                end_int = self.current_page + 5 + 1

        return end_int

    def db_start(self):

        return (self.current_page - 1) * self.per_page_num + 1

    def db_end(self):

        return self.current_page * self.per_page_num + 1

    def page_list(self):

        print(self.parms,dir(self.parms),"======================",self.parms.urlencode())

        if self.current_page == 1:

            before_page = "<li class='disable'><a href='#' aria-label='Previous'><span aria-hidden='true'>«</span></a></li>"

        else:

            self.parms["p"] = self.current_page - 1

            before_page = "<li class='disable'><a href='{url}?{args}' aria-label='Previous'><span aria-hidden='true'>«</span></a></li>".format(url=self.base_url, args=self.parms.urlencode())

        page_list = []

        page_list.append(before_page)

        for i in range(self.page_start(), self.page_end() + 1):

            self.parms["p"] = i

            if i == self.current_page:

                s = """<li class="active"><a href="{url}?{args}">{num}</a></li>""".format(url=self.base_url, args=self.parms.urlencode(),num=self.parms["p"])

            else:

                s = """<li><a href="{url}?{args}">{num}</a></li>""".format(url=self.base_url,  args=self.parms.urlencode(),num=self.parms["p"])

            page_list.append(s)

        if self.current_page == self.page_count():

            after_page = """<li class='disable'><a href="#" aria-label="Next"><span aria-hidden="true">»</span></a></li>"""

        else:

            self.parms["p"] = self.current_page + 1

            after_page = """<li><a href="{url}?{args}" aria-label="Next"><span aria-hidden="true">»</span></a></li>""".format(url=self.base_url, args=self.parms.urlencode())

        page_list.append(after_page)

        page_body = "".join(page_list)

        page_str = self.page_head + page_body + self.page_tail

        return page_str

class Showlist(object):

    def __init__(self,config,request,new_list,new_data_list):

        self.config = config

        self.request = request

        self.new_list = new_list

        self.new_data_list = new_data_list

        # 分页显示

        count = self.new_data_list.count()

        current_page = int(request.GET.get("p",1))

        per_page_num = 3

        base_url = request.path_info

        parms = request.GET

        self.page_str = page.page_helper(count=count,current_page=current_page,per_page_num=per_page_num,base_url=base_url,parms=parms)