# -*- coding: utf-8 -*-

'''

Created on Jun 16, 2013

@author: ymh

'''

from django.conf import settings

from django.core.paginator import Paginator, Page, PageNotAnInteger, EmptyPage

import logging

logger = logging.getLogger(__name__)

class JocondePaginator(Paginator):

    def validate_number(self, number):

        "Validates the given 1-based page number."

        try:

            number = int(number)

        except (TypeError, ValueError):

            raise PageNotAnInteger('That page number is not an integer')

        if number < 1:

            return 1

        if number > self.num_pages:

            if number == 1 and self.allow_empty_first_page:

                return 1

            elif self.num_pages > 0: 

                return self.num_pages

            else:

                raise EmptyPage('That page contains no results')

        return number

    def page(self, number):        

        page = super(JocondePaginator, self).page(number)

        return JocondePage(page.object_list, page.number, self)

class JocondePage(Page):

    visible_range = getattr(settings, 'PAGINATOR_VISIBLE_RANGE', 5)

    start_range = getattr(settings, 'PAGINATOR_START_RANGE', visible_range/2)

    def __get_start_range(self):

        return max(1,self.number-self.visible_range/2)

    def __get_end_range(self):

        return min(self.paginator.num_pages, self.number+self.visible_range/2) + 1

    def visible_page_range(self):        

        start = self.__get_start_range()

        end = self.__get_end_range()

        ranges = set(range(1,self.start_range+1)) | set(range(start , end)) | set(range(self.paginator.num_pages - self.start_range +1, self.paginator.num_pages+1))         

        prev = None

        res = []

        for i in sorted(ranges):

            if 1 <= i <= self.paginator.num_pages:

                if prev and i-prev > 1:

                    res.append(0)

                res.append(i)

                prev = i

        return res