# -*- coding: utf-8 -*-
# from string import Template
import string
from datetime import timedelta, datetime

class DeltaTemplate(string.Template):
    delimiter = "%"


def strfdelta(tdelta, fmt):
    d = {"D": tdelta.days}
    hours, rem = divmod(tdelta.seconds, 3600)
    minutes, seconds = divmod(rem, 60)
    d["H"] = '{:02d}'.format(hours)
    d["M"] = '{:02d}'.format(minutes)
    d["S"] = '{:02d}'.format(seconds)
    t = DeltaTemplate(fmt)
    return t.substitute(**d)


class CachedSting(object):
    def __init__(self, path, timeout=None):
        super(CachedSting, self).__init__()
        self.path = path
        self.timeout = timeout or timedelta(days=1)
        self.get_object()

    def __repr__(self):
        return self.__str__()

    def __str__(self):
        if self.timeto > datetime.now():
            return self.object
        self.get_object()
        return self.object

    def get_object(self):
        self.timeto = datetime.now() + self.timeout
        with open(self.path, 'r') as f:
            self.object = f.read()