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from __future__ import print_function, division, absolute_import

from collections import namedtuple
from datetime import datetime

from .base import VerticaPythonUnitTestCase
from ...vertica.column import timestamp_parse

TimestampTestingCase = namedtuple("TimestampTestingCase", ["string", "timestamp"])


class TimestampParsingTestCase(VerticaPythonUnitTestCase):
    def _test_timestamps(self, test_cases, msg=None):
        for tc in test_cases:
            self.assertEqual(timestamp_parse(tc.string), tc.timestamp, msg=msg)

    def test_timestamp_second_resolution(self):
        test_cases = [  # back to the future dates
            TimestampTestingCase(
                '1985-10-26 01:25:01',
                datetime(year=1985, month=10, day=26, hour=1, minute=25, second=1)
            ),
            TimestampTestingCase(
                '1955-11-12 22:55:02',
                datetime(year=1955, month=11, day=12, hour=22, minute=55, second=2)
            ),
            TimestampTestingCase(
                '2015-10-21 11:12:03',
                datetime(year=2015, month=10, day=21, hour=11, minute=12, second=3)
            ),
            TimestampTestingCase(
                '1885-01-01 01:02:04',
                datetime(year=1885, month=1, day=1, hour=1, minute=2, second=4)
            ),
            TimestampTestingCase(
                '1885-09-02 02:03:05',
                datetime(year=1885, month=9, day=2, hour=2, minute=3, second=5)
            ),
        ]
        self._test_timestamps(test_cases=test_cases, msg='timestamp second resolution')

    def test_timestamp_microsecond_resolution(self):
        test_cases = [  # back to the future dates
            TimestampTestingCase(
                '1985-10-26 01:25:01.1',
                datetime(year=1985, month=10, day=26, hour=1, minute=25, second=1,
                         microsecond=100000)
            ),
            TimestampTestingCase(
                '1955-11-12 22:55:02.01',
                datetime(year=1955, month=11, day=12, hour=22, minute=55, second=2,
                         microsecond=10000)
            ),
            TimestampTestingCase(
                '2015-10-21 11:12:03.001',
                datetime(year=2015, month=10, day=21, hour=11, minute=12, second=3,
                         microsecond=1000)
            ),
            TimestampTestingCase(
                '1885-01-01 01:02:04.000001',
                datetime(year=1885, month=1, day=1, hour=1, minute=2, second=4,
                         microsecond=1)
            ),
            TimestampTestingCase(
                '1885-09-02 02:03:05.002343',
                datetime(year=1885, month=9, day=2, hour=2, minute=3, second=5,
                         microsecond=2343)
            ),
        ]
        self._test_timestamps(test_cases=test_cases, msg='timestamp microsecond resolution')

    def test_timestamp_year_over_9999_second_resolution(self):
        # Asserts that years over 9999 are truncated to 9999
        test_cases = [
            TimestampTestingCase(
                '19850-10-26 01:25:01',
                datetime(year=9999, month=10, day=26, hour=1, minute=25, second=1)
            ),
            TimestampTestingCase(
                '10000-11-12 22:55:02',
                datetime(year=9999, month=11, day=12, hour=22, minute=55, second=2)
            ),
            TimestampTestingCase(
                '9999-10-21 11:12:03',
                datetime(year=9999, month=10, day=21, hour=11, minute=12, second=3)
            ),
            TimestampTestingCase(
                '18850-01-01 01:02:04',
                datetime(year=9999, month=1, day=1, hour=1, minute=2, second=4)
            ),
            TimestampTestingCase(
                '18850-09-02 02:03:05',
                datetime(year=9999, month=9, day=2, hour=2, minute=3, second=5)
            ),
        ]
        self._test_timestamps(test_cases=test_cases, msg='timestamp past 9999 second resolution')

    def test_timestamp_year_over_9999_microsecond_resolution(self):
        test_cases = [
            TimestampTestingCase(
                '19850-10-26 01:25:01.1',
                datetime(year=9999, month=10, day=26, hour=1, minute=25, second=1,
                         microsecond=100000)
            ),
            TimestampTestingCase(
                '10000-11-12 22:55:02.01',
                datetime(year=9999, month=11, day=12, hour=22, minute=55, second=2,
                         microsecond=10000)
            ),
            TimestampTestingCase(
                '9999-10-21 11:12:03.001',
                datetime(year=9999, month=10, day=21, hour=11, minute=12, second=3,
                         microsecond=1000)
            ),
            TimestampTestingCase(
                '18850-01-01 01:02:04.000001',
                datetime(year=9999, month=1, day=1, hour=1, minute=2, second=4,
                         microsecond=1)
            ),
            TimestampTestingCase(
                '18850-09-02 02:03:05.002343',
                datetime(year=9999, month=9, day=2, hour=2, minute=3, second=5,
                         microsecond=2343)
            ),
        ]
        self._test_timestamps(test_cases=test_cases,
                              msg='timestamp past 9999 microsecond resolution')