carom-server/billard/utils.py

from datetime import datetime, date, time, timedelta


def get_prize_for(start, end, pph=0, hh_start=None, hh_end=None, pphh=0):
    """
    calculate prize of billard table rental

    :param start: start datetime of rental
    :param end: end datetime of rental
    :param pph: prize per hour of rental
    :param hh_start: start of happy hour
    :param hh_end: end of happy hour
    :param pphh: prize per hour in happy hour
    :return: the calculated prize of rental
    """
    if end <= start:
        raise ValueError('end date must be after start date')
    prize = 0
    if hh_start is not None and hh_end is not None and pphh is not None:
        d = start.date()
        t = start.time()
        end_date = end.date()
        end_time = end.time()
        while True:
            if t < hh_start:
                if end_time < hh_start and d == end_date:
                    prize += calculate_prize_for(start=t, end=end_time, pph=pph)
                    break
                else:
                    prize += calculate_prize_for(start=t, end=hh_start, pph=pph)
                    t = hh_start
            elif hh_start <= t < hh_end:
                if end_time < hh_end and d == end_date:
                    prize += calculate_prize_for(start=t, end=end_time, pph=pphh)
                    break
                else:
                    prize += calculate_prize_for(start=t, end=hh_end, pph=pphh)
                    t = hh_end
            else:
                if d == end_date:
                    prize += calculate_prize_for(start=t, end=end_time, pph=pph)
                    break
                else:
                    prize += calculate_prize_for(start=t, end=datetime.strptime('23:59:59', '%H:%M:%S').time(), pph=pph)
                    t = datetime.strptime('00:00:00', '%H:%M:%S').time()
                    d = (datetime.combine(d, t) + timedelta(days=1)).date()
    else:
        prize = calculate_prize_for(start=start, end=end, pph=pph)
    return prize


def calculate_prize_for(start, end, pph=0):
    pps = pph / 3600
    d = date.today()
    seconds = 0
    if isinstance(start, datetime):
        seconds = (end - start).seconds
    else:
        seconds = (datetime.combine(d, end) - datetime.combine(d, start)).seconds
    return round((pps * seconds), 1)