import datetime
from collections import defaultdict

# from shifts import RotaBuilder, days, sites


class Worker:
    def __init__(
        self,
        Rota,
        id,
        name,
        site,
        grade,
        fte=100,
        nwd=None,
        end_date=None,
        oop=None,
        not_available_to_work=None,
        pref_not_to_work=None,
        work_requests=None,
        night_site="plymouth", # We set a default night_site
        previous_shifts={},
        pair=0,
    ):
        self.id = id
        self.name = name
        self.site = site
        # Grade are equivalent to roles, by keeping them integer defining model
        # rules is easier.
        self.grade = grade
        self.fte = fte
        self.nwd = nwd
        self.proportion_rota_to_work = 1
        self.pair = pair

        self.night_site = night_site

        self.previous_shifts = previous_shifts

        self.shift_target_number = defaultdict(int)

        days_to_work = Rota.rota_days_length

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

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

                    # add unavalabilities
                    for weeks_days in Rota.weeks_days_product[days_to_work:]:
                        week, day = weeks_days
                        Rota.unavailable_to_work.add((self.id, week, day))
                        Rota.unavailable_to_work_reason[
                            (self.id, week, day)
                        ] = "END DATE"

        if oop is not None:
            start_oop, end_oop = oop
            start_oop_date = datetime.datetime.strptime(start_oop, "%d/%m/%y").date()
            end_oop_date = datetime.datetime.strptime(end_oop, "%d/%m/%y").date()

            # ignore oops if they finish before the rota start date
            print(end_oop_date, Rota.start_date)
            if end_oop_date > Rota.start_date:
                if start_oop_date > Rota.rota_end_date:
                    pass
                else:
                    if end_oop_date > Rota.rota_end_date:
                        end_oop_date = Rota.rota_end_date

                    if start_oop_date < Rota.start_date:
                        start_oop_date = Rota.start_date

                    oop_length = (end_oop_date - start_oop_date).days
                    days_to_work = days_to_work - oop_length

                    days_until_oop = (start_oop_date - Rota.start_date).days

                    for weeks_days in Rota.weeks_days_product[
                        days_until_oop : days_until_oop + oop_length
                    ]:
                        week, day = weeks_days
                        Rota.unavailable_to_work.add((self.id, week, day))
                        Rota.unavailable_to_work_reason[
                            (self.id, week, day)
                        ] = "OOP ()".format(oop)

        if pref_not_to_work is not None:
            # loop throught dates converting to week / day combination
            for date in pref_not_to_work:
                days_from_start = (
                    datetime.datetime.strptime(date, "%d/%m/%y").date()
                    - Rota.start_date
                ).days
                week = days_from_start // 7 + 1
                day = Rota.days[(days_from_start % 7)]
                # Weight the value to take into account the number of preferences
                # 1 is added to the total number of requests to ensure they do not outweight
                # a single (or fewer) request(s)
                Rota.pref_not_to_work[(self.id, week, day)] = 1 / (
                    len(pref_not_to_work) + 1
                )

        if not_available_to_work is not None:
            # print(not_available_to_work)
            # loop throught dates converting to week / day combination
            for date, reason in not_available_to_work:
                days_from_start = (
                    datetime.datetime.strptime(date, "%d/%m/%y").date()
                    - Rota.start_date
                ).days
                week = days_from_start // 7 + 1
                day = Rota.days[(days_from_start % 7)]
                Rota.unavailable_to_work.add((self.id, week, day))
                Rota.unavailable_to_work_reason[(self.id, week, day)] = reason

        if work_requests is not None:
            for date, shift in work_requests:
                days_from_start = (
                    datetime.datetime.strptime(date, "%d/%m/%y").date()
                    - Rota.start_date
                ).days
                week = days_from_start // 7 + 1
                day = Rota.days[(days_from_start % 7)]
                Rota.work_requests.add((self.id, week, day, shift))

        # Calculate the proportion of the rota that is being worked
        self.proportion_rota_to_work = days_to_work / Rota.rota_days_length

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

        if self.fte_adj > 100:
            raise ValueError("{} : fte_ajd = {}".format(self.name, self.fte_adj))

        # print(self.name, self.nwd)

    def __lt__(self, other):
        return (self.site, self.grade, self.fte_adj, self.name) < (
            other.site,
            other.grade,
            other.fte_adj,
            other.name,
        )

    def __str__(self):

        nwd = ", ".join([str(i) for i in self.nwd]) if self.nwd is not None else ""
        return "{} {} [{}] PROC SITE:{} ({})".format(
            self.name,
            (self.site, self.grade, self.fte_adj),
            nwd,
            self.night_site,
        )

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

    def get_full_details(self):
        return "{}/{}/{}".format(self.site, self.grade, self.name)