# coding=utf-8
import os
from base import init_env

os.environ["DJANGO_SETTINGS_MODULE"] = "configs.dev_zjl"

init_env(False)

from apps.web.device.models import Device
from apps.web.common.proxy import QuerySetProxy


class SubQuerySet(object):

    def __init__(self, numbers, flag):
        """
        list [1, 2, 3, 4, ．．．．．．]
        """
        self._data =  numbers
        self._count = len(numbers)
        self._flag = flag

    def count(self):
        print self._count
        return self._count

    @property
    def amountOfData(self):
        return self._data

    @amountOfData.setter
    def amountOfData(self, value):
        from copy import copy
        new_value = copy(value)
        self._data = new_value

    def skip(self, n):
        """
        跳过的意思就是有多少条数据不需要获得
        """
        assert n >= 0, "skip numbers must >=0 "

        self.amountOfData = self.amountOfData[n:]
        return self

    def limit(self, n):
        assert n >= 0, "skip numbers must >=0 "

        return self.__class__(self.amountOfData[:n], self._flag)

    def __iter__(self):
        for i in self.amountOfData:
            yield "{}-{}".format(self._flag, i)


def do_1():
    TestQuerySetOne = SubQuerySet(range(1, 97), "one")
    TestQuerySetTwo = SubQuerySet(range(97, 1001), "two")

    # 输出　第　３　页　
    TestPageIndex = 10
    TestPageSize = 10
    for i in QuerySetProxy(TestQuerySetOne, TestQuerySetTwo).paginate(pageIndex=TestPageIndex, pageSize=TestPageSize):
        print i

do_1()