#
# Copyright 2012 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.

from unittest import TestCase
from zipline.utils import tradingcalendar
import pytz
import datetime


class TestTradingCalendar(TestCase):

    def test_tradingcalendar(self):
        """
        Check whether tradingcalendar contains certain dates.
        """
        #     January 2012
        # Su Mo Tu We Th Fr Sa
        #  1  2  3  4  5  6  7
        #  8  9 10 11 12 13 14
        # 15 16 17 18 19 20 21
        # 22 23 24 25 26 27 28
        # 29 30 31

        day_after_new_years_sunday = datetime.datetime(
            2012, 1, 2, tzinfo=pytz.utc)

        self.assertNotIn(day_after_new_years_sunday,
                         tradingcalendar.trading_days,
                         """
If NYE falls on a weekend, {0} the Monday after is a holiday.
""".strip().format(day_after_new_years_sunday)
        )

        first_trading_day_after_new_years_sunday = datetime.datetime(
            2012, 1, 3, tzinfo=pytz.utc)

        self.assertIn(first_trading_day_after_new_years_sunday,
                      tradingcalendar.trading_days,
                      """
If NYE falls on a weekend, {0} the Tuesday after is the first trading day.
""".strip().format(first_trading_day_after_new_years_sunday)
        )

        #     January 2005
        # Su Mo Tu We Th Fr Sa
        #                    1
        #  2  3  4  5  6  7  8
        #  9 10 11 12 13 14 15
        # 16 17 18 19 20 21 22
        # 23 24 25 26 27 28 29
        # 30 31

        day_after_new_years_saturday = datetime.datetime(
            2005, 1, 3, tzinfo=pytz.utc)

        self.assertNotIn(day_after_new_years_saturday,
                         tradingcalendar.trading_days,
                         """
If NYE falls on a weekend, {0} the Monday after is a holiday.
""".strip().format(day_after_new_years_saturday)
        )

        first_trading_day_after_new_years_saturday = datetime.datetime(
            2005, 1, 4, tzinfo=pytz.utc)

        self.assertIn(first_trading_day_after_new_years_saturday,
                      tradingcalendar.trading_days,
                      """
If NYE falls on a weekend, {0} the Tuesday after is the first trading day.
""".strip().format(first_trading_day_after_new_years_saturday)
        )

        #     January 2013
        # Su Mo Tu We Th Fr Sa
        #        1  2  3  4  5
        #  6  7  8  9 10 11 12
        # 13 14 15 16 17 18 19
        # 20 21 22 23 24 25 26
        # 27 28 29 30 31

        new_years_day = datetime.datetime(
            2013, 1, 1, tzinfo=pytz.utc)

        self.assertNotIn(new_years_day,
                         tradingcalendar.trading_days,
                         """
If NYE falls during the week, e.g. {0}, it is a holiday.
""".strip().format(new_years_day)
        )

        first_trading_day_after_new_years = datetime.datetime(
            2013, 1, 2, tzinfo=pytz.utc)

        self.assertIn(first_trading_day_after_new_years,
                      tradingcalendar.trading_days,
                      """
If the day after NYE falls during the week, {0} \
is the first trading day.
""".strip().format(first_trading_day_after_new_years)
        )