from datetime import date
from ..core import WesternCalendar, FRI, SAT
from ..registry_tools import iso_register


@iso_register('SE')
class Sweden(WesternCalendar):
    'Sweden'

    # Christian holidays
    include_epiphany = True
    include_good_friday = True
    include_easter_sunday = True
    include_easter_monday = True
    include_ascension = True
    include_whit_sunday = True
    whit_sunday_label = "Pentecost"
    # Christmas Eve is not a holiday but not a work day either
    include_christmas_eve = True
    include_boxing_day = True
    boxing_day_label = "Second Day of Christmas"
    observance_shift = None

    # Civil holidays
    include_labour_day = True
    FIXED_HOLIDAYS = WesternCalendar.FIXED_HOLIDAYS + (
        (6, 6, "National Day"),
        # New Year's Eve is not a holiday but not a work day either
        (12, 31, "New Year's Eve")
    )

    # Midsummer Eve is not a holiday but not a work day either
    def get_midsummer_eve(self, year):
        date_eve = Sweden.get_nth_weekday_in_month(
            year, 6, FRI, start=date(year, 6, 19))
        return date_eve

    def get_midsummer_day(self, year):
        date_eve = Sweden.get_nth_weekday_in_month(
            year, 6, SAT, start=date(year, 6, 20))
        return date_eve

    def get_variable_all_saints(self, year):
        all_saints = date(year, 10, 31)
        if all_saints.weekday() != SAT:
            all_saints = Sweden.get_nth_weekday_in_month(
                year, 11, SAT)
        return all_saints

    def get_variable_days(self, year):
        days = super().get_variable_days(year)
        days.append((self.get_midsummer_day(year), "Midsummer's Day"))
        days.append((self.get_midsummer_eve(year), "Midsummer's Eve"))
        days.append((self.get_variable_all_saints(year), "All Saints"))
        return days