import datetime
from decimal import Decimal

from django.contrib.humanize.templatetags import humanize
from django.template import Context, Template, defaultfilters
from django.test import SimpleTestCase, modify_settings, override_settings
from django.utils import translation
from django.utils.html import escape
from django.utils.timezone import get_fixed_timezone, utc
from django.utils.translation import gettext as _

# Mock out datetime in some tests so they don't fail occasionally when they
# run too slow. Use a fixed datetime for datetime.now(). DST change in
# America/Chicago (the default time zone) happened on March 11th in 2012.

now = datetime.datetime(2012, 3, 9, 22, 30)


class MockDateTime(datetime.datetime):
    @classmethod
    def now(cls, tz=None):
        if tz is None or tz.utcoffset(now) is None:
            return now
        else:
            # equals now.replace(tzinfo=utc)
            return now.replace(tzinfo=tz) + tz.utcoffset(now)


@modify_settings(INSTALLED_APPS={'append': 'django.contrib.humanize'})
class HumanizeTests(SimpleTestCase):

    def humanize_tester(self, test_list, result_list, method, normalize_result_func=escape):
        for test_content, result in zip(test_list, result_list):
            with self.subTest(test_content):
                t = Template('{%% load humanize %%}{{ test_content|%s }}' % method)
                rendered = t.render(Context(locals())).strip()
                self.assertEqual(
                    rendered,
                    normalize_result_func(result),
                    msg="%s test failed, produced '%s', should've produced '%s'" % (method, rendered, result)
                )

    def test_ordinal(self):
        test_list = ('1', '2', '3', '4', '11', '12',
                     '13', '101', '102', '103', '111',
                     'something else', None)
        result_list = ('1st', '2nd', '3rd', '4th', '11th',
                       '12th', '13th', '101st', '102nd', '103rd',
                       '111th', 'something else', None)

        with translation.override('en'):
            self.humanize_tester(test_list, result_list, 'ordinal')

    def test_i18n_html_ordinal(self):
        """Allow html in output on i18n strings"""
        test_list = ('1', '2', '3', '4', '11', '12',
                     '13', '101', '102', '103', '111',
                     'something else', None)
        result_list = ('1<sup>er</sup>', '2<sup>e</sup>', '3<sup>e</sup>', '4<sup>e</sup>',
                       '11<sup>e</sup>', '12<sup>e</sup>', '13<sup>e</sup>', '101<sup>er</sup>',
                       '102<sup>e</sup>', '103<sup>e</sup>', '111<sup>e</sup>', 'something else',
                       'None')

        with translation.override('fr-fr'):
            self.humanize_tester(test_list, result_list, 'ordinal', lambda x: x)

    def test_intcomma(self):
        test_list = (
            100, 1000, 10123, 10311, 1000000, 1234567.25, '100', '1000',
            '10123', '10311', '1000000', '1234567.1234567',
            Decimal('1234567.1234567'), None,
        )
        result_list = (
            '100', '1,000', '10,123', '10,311', '1,000,000', '1,234,567.25',
            '100', '1,000', '10,123', '10,311', '1,000,000', '1,234,567.1234567',
            '1,234,567.1234567', None,
        )
        with translation.override('en'):
            self.humanize_tester(test_list, result_list, 'intcomma')

    def test_l10n_intcomma(self):
        test_list = (
            100, 1000, 10123, 10311, 1000000, 1234567.25, '100', '1000',
            '10123', '10311', '1000000', '1234567.1234567',
            Decimal('1234567.1234567'), None,
        )
        result_list = (
            '100', '1,000', '10,123', '10,311', '1,000,000', '1,234,567.25',
            '100', '1,000', '10,123', '10,311', '1,000,000', '1,234,567.1234567',
            '1,234,567.1234567', None,
        )
        with self.settings(USE_L10N=True, USE_THOUSAND_SEPARATOR=False):
            with translation.override('en'):
                self.humanize_tester(test_list, result_list, 'intcomma')

    def test_intcomma_without_number_grouping(self):
        # Regression for #17414
        with translation.override('ja'), self.settings(USE_L10N=True):
            self.humanize_tester([100], ['100'], 'intcomma')

    def test_intword(self):
        test_list = (
            '100', '1000000', '1200000', '1290000', '1000000000', '2000000000',
            '6000000000000', '1300000000000000', '3500000000000000000000',
            '8100000000000000000000000000000000', None, ('1' + '0' * 100),
            ('1' + '0' * 104),
        )
        result_list = (
            '100', '1.0 million', '1.2 million', '1.3 million', '1.0 billion',
            '2.0 billion', '6.0 trillion', '1.3 quadrillion', '3.5 sextillion',
            '8.1 decillion', None, '1.0 googol', ('1' + '0' * 104),
        )
        with translation.override('en'):
            self.humanize_tester(test_list, result_list, 'intword')

    def test_i18n_intcomma(self):
        test_list = (100, 1000, 10123, 10311, 1000000, 1234567.25,
                     '100', '1000', '10123', '10311', '1000000', None)
        result_list = ('100', '1.000', '10.123', '10.311', '1.000.000', '1.234.567,25',
                       '100', '1.000', '10.123', '10.311', '1.000.000', None)
        with self.settings(USE_L10N=True, USE_THOUSAND_SEPARATOR=True):
            with translation.override('de'):
                self.humanize_tester(test_list, result_list, 'intcomma')

    def test_i18n_intword(self):
        test_list = (
            '100', '1000000', '1200000', '1290000', '1000000000', '2000000000',
            '6000000000000',
        )
        result_list = (
            '100', '1,0 Million', '1,2 Millionen', '1,3 Millionen',
            '1,0 Milliarde', '2,0 Milliarden', '6,0 Billionen',
        )
        with self.settings(USE_L10N=True, USE_THOUSAND_SEPARATOR=True):
            with translation.override('de'):
                self.humanize_tester(test_list, result_list, 'intword')

    def test_apnumber(self):
        test_list = [str(x) for x in range(1, 11)]
        test_list.append(None)
        result_list = ('one', 'two', 'three', 'four', 'five', 'six', 'seven', 'eight', 'nine', '10', None)
        with translation.override('en'):
            self.humanize_tester(test_list, result_list, 'apnumber')

    def test_naturalday(self):
        today = datetime.date.today()
        yesterday = today - datetime.timedelta(days=1)
        tomorrow = today + datetime.timedelta(days=1)
        someday = today - datetime.timedelta(days=10)
        notdate = "I'm not a date value"

        test_list = (today, yesterday, tomorrow, someday, notdate, None)
        someday_result = defaultfilters.date(someday)
        result_list = (_('today'), _('yesterday'), _('tomorrow'),
                       someday_result, "I'm not a date value", None)
        self.humanize_tester(test_list, result_list, 'naturalday')

    def test_naturalday_tz(self):
        today = datetime.date.today()
        tz_one = get_fixed_timezone(-720)
        tz_two = get_fixed_timezone(720)

        # Can be today or yesterday
        date_one = datetime.datetime(today.year, today.month, today.day, tzinfo=tz_one)
        naturalday_one = humanize.naturalday(date_one)
        # Can be today or tomorrow
        date_two = datetime.datetime(today.year, today.month, today.day, tzinfo=tz_two)
        naturalday_two = humanize.naturalday(date_two)

        # As 24h of difference they will never be the same
        self.assertNotEqual(naturalday_one, naturalday_two)

    def test_naturalday_uses_localtime(self):
        # Regression for #18504
        # This is 2012-03-08HT19:30:00-06:00 in America/Chicago
        dt = datetime.datetime(2012, 3, 9, 1, 30, tzinfo=utc)

        orig_humanize_datetime, humanize.datetime = humanize.datetime, MockDateTime
        try:
            with override_settings(TIME_ZONE="America/Chicago", USE_TZ=True):
                with translation.override('en'):
                    self.humanize_tester([dt], ['yesterday'], 'naturalday')
        finally:
            humanize.datetime = orig_humanize_datetime

    def test_naturaltime(self):
        class naive(datetime.tzinfo):
            def utcoffset(self, dt):
                return None
        test_list = [
            'test',
            now,
            now - datetime.timedelta(microseconds=1),
            now - datetime.timedelta(seconds=1),
            now - datetime.timedelta(seconds=30),
            now - datetime.timedelta(minutes=1, seconds=30),
            now - datetime.timedelta(minutes=2),
            now - datetime.timedelta(hours=1, minutes=30, seconds=30),
            now - datetime.timedelta(hours=23, minutes=50, seconds=50),
            now - datetime.timedelta(days=1),
            now - datetime.timedelta(days=500),
            now + datetime.timedelta(seconds=1),
            now + datetime.timedelta(seconds=30),
            now + datetime.timedelta(minutes=1, seconds=30),
            now + datetime.timedelta(minutes=2),
            now + datetime.timedelta(hours=1, minutes=30, seconds=30),
            now + datetime.timedelta(hours=23, minutes=50, seconds=50),
            now + datetime.timedelta(days=1),
            now + datetime.timedelta(days=2, hours=6),
            now + datetime.timedelta(days=500),
            now.replace(tzinfo=naive()),
            now.replace(tzinfo=utc),
        ]
        result_list = [
            'test',
            'now',
            'now',
            'a second ago',
            '30\xa0seconds ago',
            'a minute ago',
            '2\xa0minutes ago',
            'an hour ago',
            '23\xa0hours ago',
            '1\xa0day ago',
            '1\xa0year, 4\xa0months ago',
            'a second from now',
            '30\xa0seconds from now',
            'a minute from now',
            '2\xa0minutes from now',
            'an hour from now',
            '23\xa0hours from now',
            '1\xa0day from now',
            '2\xa0days, 6\xa0hours from now',
            '1\xa0year, 4\xa0months from now',
            'now',
            'now',
        ]
        # Because of the DST change, 2 days and 6 hours after the chosen
        # date in naive arithmetic is only 2 days and 5 hours after in
        # aware arithmetic.
        result_list_with_tz_support = result_list[:]
        assert result_list_with_tz_support[-4] == '2\xa0days, 6\xa0hours from now'
        result_list_with_tz_support[-4] == '2\xa0days, 5\xa0hours from now'

        orig_humanize_datetime, humanize.datetime = humanize.datetime, MockDateTime
        try:
            with translation.override('en'):
                self.humanize_tester(test_list, result_list, 'naturaltime')
                with override_settings(USE_TZ=True):
                    self.humanize_tester(
                        test_list, result_list_with_tz_support, 'naturaltime')
        finally:
            humanize.datetime = orig_humanize_datetime

    def test_naturaltime_as_documented(self):
        """
        #23340 -- Verify the documented behavior of humanize.naturaltime.
        """
        time_format = '%d %b %Y %H:%M:%S'
        documented_now = datetime.datetime.strptime('17 Feb 2007 16:30:00', time_format)

        test_data = (
            ('17 Feb 2007 16:30:00', 'now'),
            ('17 Feb 2007 16:29:31', '29 seconds ago'),
            ('17 Feb 2007 16:29:00', 'a minute ago'),
            ('17 Feb 2007 16:25:35', '4 minutes ago'),
            ('17 Feb 2007 15:30:29', '59 minutes ago'),
            ('17 Feb 2007 15:30:01', '59 minutes ago'),
            ('17 Feb 2007 15:30:00', 'an hour ago'),
            ('17 Feb 2007 13:31:29', '2 hours ago'),
            ('16 Feb 2007 13:31:29', '1 day, 2 hours ago'),
            ('16 Feb 2007 13:30:01', '1 day, 2 hours ago'),
            ('16 Feb 2007 13:30:00', '1 day, 3 hours ago'),
            ('17 Feb 2007 16:30:30', '30 seconds from now'),
            ('17 Feb 2007 16:30:29', '29 seconds from now'),
            ('17 Feb 2007 16:31:00', 'a minute from now'),
            ('17 Feb 2007 16:34:35', '4 minutes from now'),
            ('17 Feb 2007 17:30:29', 'an hour from now'),
            ('17 Feb 2007 18:31:29', '2 hours from now'),
            ('18 Feb 2007 16:31:29', '1 day from now'),
            ('26 Feb 2007 18:31:29', '1 week, 2 days from now'),
        )

        class DocumentedMockDateTime(datetime.datetime):
            @classmethod
            def now(cls, tz=None):
                if tz is None or tz.utcoffset(documented_now) is None:
                    return documented_now
                else:
                    return documented_now.replace(tzinfo=tz) + tz.utcoffset(now)

        orig_humanize_datetime = humanize.datetime
        humanize.datetime = DocumentedMockDateTime
        try:
            for test_time_string, expected_natural_time in test_data:
                with self.subTest(test_time_string):
                    test_time = datetime.datetime.strptime(test_time_string, time_format)
                    natural_time = humanize.naturaltime(test_time).replace('\xa0', ' ')
                    self.assertEqual(expected_natural_time, natural_time)
        finally:
            humanize.datetime = orig_humanize_datetime

    def test_inflection_for_timedelta(self):
        """
        Translation of '%d day'/'%d month'/… may differ depending on the context
        of the string it is inserted in.
        """
        test_list = [
            # "%(delta)s ago" translations
            now - datetime.timedelta(days=1),
            now - datetime.timedelta(days=2),
            now - datetime.timedelta(days=30),
            now - datetime.timedelta(days=60),
            now - datetime.timedelta(days=500),
            now - datetime.timedelta(days=865),
            # "%(delta)s from now" translations
            now + datetime.timedelta(days=1),
            now + datetime.timedelta(days=2),
            now + datetime.timedelta(days=30),
            now + datetime.timedelta(days=60),
            now + datetime.timedelta(days=500),
            now + datetime.timedelta(days=865),
        ]
        result_list = [
            'před 1\xa0dnem',
            'před 2\xa0dny',
            'před 1\xa0měsícem',
            'před 2\xa0měsíci',
            'před 1\xa0rokem, 4\xa0měsíci',
            'před 2\xa0lety, 4\xa0měsíci',
            'za 1\xa0den',
            'za 2\xa0dny',
            'za 1\xa0měsíc',
            'za 2\xa0měsíce',
            'za 1\xa0rok, 4\xa0měsíce',
            'za 2\xa0roky, 4\xa0měsíce',
        ]

        orig_humanize_datetime, humanize.datetime = humanize.datetime, MockDateTime
        try:
            # Choose a language with different naturaltime-past/naturaltime-future translations
            with translation.override('cs'), self.settings(USE_L10N=True):
                self.humanize_tester(test_list, result_list, 'naturaltime')
        finally:
            humanize.datetime = orig_humanize_datetime
