# coding=utf-8
import datetime

import typing

from library.validator import Validator, UnicodeValidationError
from library.validator.fields import StringField
from apilib.monetary import RMB, VirtualCoin

if typing:
    from apps.web.user.models import ConsumeRecord


class Calculator(object):

    def __init__(self, order):  # type:(ConsumeRecord) -> None
        self._order = order
        self._st, self._et = order.dateTimeAdded, order.finishedTime or datetime.datetime.now()

        self._package = order.package

    def calculate(self):
        """
        计费的时候以n小时为周期 不满n小时计算n小时 不超过最大费用
        """
        price = VirtualCoin(self._package["price"])
        maxFee = VirtualCoin(self._package["maxFee"])
        cycle = float(self._package["cycle"])
        freeHour = float(self._package["freeHour"])
        duration = int((self._et - self._st).total_seconds())

        # 没有超过免费停车时间的
        if int(freeHour * 3600) > duration:
            return VirtualCoin(0)

        # 计算应该付款的费用
        cycleSecond = cycle * 3600
        n = duration // cycleSecond + int(bool(duration % cycleSecond))
        fee = price * n
        # 与单项最大费用做比较S
        return min(VirtualCoin(fee), VirtualCoin(maxFee))