import datetime

from shifts import SingleShift, ShiftCollection, days, sites


class Worker:
    def __init__(self, Shifts, id, name, site, grade, fte=100, nwd=[], end_date=None, oop=None):
        self.id = id
        self.name = name
        self.site = site
        self.grade = grade
        self.fte = fte
        self.nwd = nwd
        self.proportion_rota_to_work = 1

        days_to_work = Shifts.rota_days_length

        if end_date is None:
            self.end_date = None
        else:
            self.end_date = datetime.datetime.strptime(end_date, '%Y/%m/%d').date()

            if self.end_date > Shifts.rota_end_date:
                self.end_date = Shifts.rota_end_date
            else:
                days_to_work = (self.end_date - Shifts.start_date).days

                # add unavalabilities
                for weeks_days in Shifts.weeks_days_product[days_to_work:]:
                    week, day = weeks_days
                    unavailable_to_work.add((self.id, week, day))
        
        if oop is not None:
            start_oop, end_oop = oop
            start_oop_date = datetime.datetime.strptime(start_oop, '%Y/%m/%d').date()
            end_oop_date = datetime.datetime.strptime(end_oop, '%Y/%m/%d').date()

            if end_oop_date > Shifts.rota_end_date:
                end_oop_date = Shifts.rota_end_date
            
            oop_length = (end_oop_date - start_oop_date).days
            days_to_work = days_to_work - oop_length

            days_until_oop = (start_oop_date - Shifts.start_date).days

            for weeks_days in Shifts.weeks_days_product[days_until_oop:days_until_oop+oop_length]:
                week, day = weeks_days
                unavailable_to_work.add((self.id, week, day))

        
        self.proportion_rota_to_work = days_to_work / Shifts.rota_days_length

        # We had to adjust the full time equivalent for people who CCT / leave the rota early
        self.fte_adj = self.fte * self.proportion_rota_to_work

    def __lt__(self, other):
        return (self.site, self.grade, self.name) < (other.site, other.grade, other.name)
    
    def get_details(self):
        return "{} {} {}".format(self.id, self.site[0], self.grade)