#
# Copyright 2018 Quantopian, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# Useful source for the history of New Zealand public holidays:
# Nancy Swarbrick, 'Public holidays', Te Ara - the Encyclopedia of New Zealand
# http://www.TeAra.govt.nz/en/public-holidays/print (accessed 22 December 2019)

from datetime import time
from pytz import UTC
from pandas import Timestamp

from pandas.tseries.holiday import (
    DateOffset,
    EasterMonday,
    GoodFriday,
    Holiday,
    MO,
    next_monday,
    next_monday_or_tuesday,
    previous_workday,
    weekend_to_monday,
)
from pytz import timezone

from .common_holidays import (
    new_years_day,
    anzac_day,
    christmas,
    boxing_day,
)

from .trading_calendar import (
    TradingCalendar,
    HolidayCalendar
)


# Prior to 2015, Waitangi Day and Anzac Day are not "Mondayized",
# that is, if they occur on the weekend, there is no make-up.
MONDAYIZATION_START_DATE = "2015-01-01"

# Regular Holidays
# ----------------
NewYearsDay = new_years_day(observance=next_monday)

DayAfterNewYearsDay = Holiday(
    "Day after New Year's Day",
    month=1,
    day=2,
    observance=next_monday_or_tuesday,
)

WaitangiDayNonMondayized = Holiday(
    "Waitangi Day",
    month=2,
    day=6,
    end_date=MONDAYIZATION_START_DATE,
)

WaitangiDay = Holiday(
    "Waitangi Day",
    month=2,
    day=6,
    observance=weekend_to_monday,
    start_date=MONDAYIZATION_START_DATE,
)

AnzacDayNonMondayized = anzac_day(end_date=MONDAYIZATION_START_DATE)

AnzacDay = anzac_day(
    observance=weekend_to_monday,
    start_date=MONDAYIZATION_START_DATE,
)

QueensBirthday = Holiday(
    "Queen's Birthday",
    month=6,
    day=1,
    offset=DateOffset(weekday=MO(1)),
)

LabourDay = Holiday(
    "Labour Day",
    month=10,
    day=1,
    offset=DateOffset(weekday=MO(4)),
)

Christmas = christmas(observance=next_monday)

BoxingDay = boxing_day(observance=next_monday_or_tuesday)


# Early Closes
# ------------
BusinessDayPriorToChristmasDay = Holiday(
    "Business Day prior to Christmas Day",
    month=12,
    day=25,
    observance=previous_workday,
    start_date="2011-01-01",
)

BusinessDayPriorToNewYearsDay = Holiday(
    "Business Day prior to New Year's Day",
    month=1,
    day=1,
    observance=previous_workday,
    start_date="2011-01-01",
)

# Further ad-hoc holidays and closures sourced from gaps in index series
XMAS22DEC86 = Timestamp('1986-12-22', tz=UTC)
XMAS23DEC86 = Timestamp('1986-12-23', tz=UTC)
XMAS24DEC86 = Timestamp('1986-12-24', tz=UTC)
XMAS29DEC86 = Timestamp('1986-12-29', tz=UTC)
XMAS30DEC86 = Timestamp('1986-12-30', tz=UTC)
XMAS31DEC86 = Timestamp('1986-12-31', tz=UTC)
XMAS24DEC90 = Timestamp('1990-12-24', tz=UTC)
XMAS31DEC90 = Timestamp('1990-12-31', tz=UTC)
XMAS27DEC91 = Timestamp('1991-12-27', tz=UTC)
NYDX03JAN92 = Timestamp('1992-01-03', tz=UTC)
XMAS31DEC99 = Timestamp('1999-12-31', tz=UTC)


class XNZEExchangeCalendar(TradingCalendar):
    """
    Exchange calendar for the New Zealand Exchange (NZX).

    Open Time: 10:00 AM, NZ
    Close Time: 4:45 PM, NZ

    Regularly-Observed Holidays:
    - New Year's Day
    - Day after New Year's Day
    - Waitangi Day
    - Good Friday
    - Easter Monday
    - Anzac Day
    - Queen's Birthday
    - Labour Day
    - Christmas
    - Boxing Day

    Early Closes:
    - Business Day prior to Christmas Day
    - Business Day prior to New Year's Day
    """
    regular_early_close = time(12, 45)

    name = 'XNZE'

    tz = timezone('NZ')

    open_times = (
        (None, time(10, 1)),
    )

    close_times = (
        (None, time(16, 45)),
    )

    @property
    def regular_holidays(self):
        return HolidayCalendar([
            NewYearsDay,
            DayAfterNewYearsDay,
            WaitangiDayNonMondayized,
            WaitangiDay,
            GoodFriday,
            EasterMonday,
            AnzacDayNonMondayized,
            AnzacDay,
            QueensBirthday,
            LabourDay,
            Christmas,
            BoxingDay,
        ])

    # add extra ad-hoc holidays
    @property
    def adhoc_holidays(self):
        return [XMAS22DEC86, XMAS23DEC86, XMAS24DEC86, XMAS29DEC86,
                XMAS30DEC86, XMAS31DEC86, XMAS24DEC90, XMAS31DEC90,
                XMAS27DEC91, NYDX03JAN92, XMAS31DEC99]

    @property
    def special_closes(self):
        return [
            (
                self.regular_early_close,
                HolidayCalendar([
                    BusinessDayPriorToChristmasDay,
                    BusinessDayPriorToNewYearsDay
                ])
            )
        ]
