from datetime import date, datetime, timezone

from django.core.exceptions import ValidationError
from django.forms import DateTimeField
from django.test import SimpleTestCase
from django.utils.timezone import get_fixed_timezone


class DateTimeFieldTest(SimpleTestCase):
    def test_datetimefield_clean(self):
        tests = [
            (date(2006, 10, 25), datetime(2006, 10, 25, 0, 0)),
            (datetime(2006, 10, 25, 14, 30), datetime(2006, 10, 25, 14, 30)),
            (datetime(2006, 10, 25, 14, 30, 59), datetime(2006, 10, 25, 14, 30, 59)),
            (
                datetime(2006, 10, 25, 14, 30, 59, 200),
                datetime(2006, 10, 25, 14, 30, 59, 200),
            ),
            ("2006-10-25 14:30:45.000200", datetime(2006, 10, 25, 14, 30, 45, 200)),
            ("2006-10-25 14:30:45.0002", datetime(2006, 10, 25, 14, 30, 45, 200)),
            ("2006-10-25 14:30:45", datetime(2006, 10, 25, 14, 30, 45)),
            ("2006-10-25 14:30:00", datetime(2006, 10, 25, 14, 30)),
            ("2006-10-25 14:30", datetime(2006, 10, 25, 14, 30)),
            ("2006-10-25", datetime(2006, 10, 25, 0, 0)),
            ("10/25/2006 14:30:45.000200", datetime(2006, 10, 25, 14, 30, 45, 200)),
            ("10/25/2006 14:30:45", datetime(2006, 10, 25, 14, 30, 45)),
            ("10/25/2006 14:30:00", datetime(2006, 10, 25, 14, 30)),
            ("10/25/2006 14:30", datetime(2006, 10, 25, 14, 30)),
            ("10/25/2006", datetime(2006, 10, 25, 0, 0)),
            ("10/25/06 14:30:45.000200", datetime(2006, 10, 25, 14, 30, 45, 200)),
            ("10/25/06 14:30:45", datetime(2006, 10, 25, 14, 30, 45)),
            ("10/25/06 14:30:00", datetime(2006, 10, 25, 14, 30)),
            ("10/25/06 14:30", datetime(2006, 10, 25, 14, 30)),
            ("10/25/06", datetime(2006, 10, 25, 0, 0)),
            # ISO 8601 formats.
            (
                "2014-09-23T22:34:41.614804",
                datetime(2014, 9, 23, 22, 34, 41, 614804),
            ),
            ("2014-09-23T22:34:41", datetime(2014, 9, 23, 22, 34, 41)),
            ("2014-09-23T22:34", datetime(2014, 9, 23, 22, 34)),
            ("2014-09-23", datetime(2014, 9, 23, 0, 0)),
            ("2014-09-23T22:34Z", datetime(2014, 9, 23, 22, 34, tzinfo=timezone.utc)),
            (
                "2014-09-23T22:34+07:00",
                datetime(2014, 9, 23, 22, 34, tzinfo=get_fixed_timezone(420)),
            ),
            # Whitespace stripping.
            (" 2006-10-25   14:30:45 ", datetime(2006, 10, 25, 14, 30, 45)),
            (" 2006-10-25 ", datetime(2006, 10, 25, 0, 0)),
            (" 10/25/2006 14:30:45 ", datetime(2006, 10, 25, 14, 30, 45)),
            (" 10/25/2006 14:30 ", datetime(2006, 10, 25, 14, 30)),
            (" 10/25/2006 ", datetime(2006, 10, 25, 0, 0)),
            (" 10/25/06 14:30:45 ", datetime(2006, 10, 25, 14, 30, 45)),
            (" 10/25/06 ", datetime(2006, 10, 25, 0, 0)),
            (
                " 2014-09-23T22:34:41.614804 ",
                datetime(2014, 9, 23, 22, 34, 41, 614804),
            ),
            (" 2014-09-23T22:34Z ", datetime(2014, 9, 23, 22, 34, tzinfo=timezone.utc)),
        ]
        f = DateTimeField()
        for value, expected_datetime in tests:
            with self.subTest(value=value):
                self.assertEqual(f.clean(value), expected_datetime)

    def test_datetimefield_clean_invalid(self):
        f = DateTimeField()
        msg = "'Enter a valid date/time.'"
        with self.assertRaisesMessage(ValidationError, msg):
            f.clean("hello")
        with self.assertRaisesMessage(ValidationError, msg):
            f.clean("2006-10-25 4:30 p.m.")
        with self.assertRaisesMessage(ValidationError, msg):
            f.clean("   ")
        with self.assertRaisesMessage(ValidationError, msg):
            f.clean("2014-09-23T28:23")
        f = DateTimeField(input_formats=["%Y %m %d %I:%M %p"])
        with self.assertRaisesMessage(ValidationError, msg):
            f.clean("2006.10.25 14:30:45")

    def test_datetimefield_clean_input_formats(self):
        tests = [
            (
                "%Y %m %d %I:%M %p",
                (
                    (date(2006, 10, 25), datetime(2006, 10, 25, 0, 0)),
                    (datetime(2006, 10, 25, 14, 30), datetime(2006, 10, 25, 14, 30)),
                    (
                        datetime(2006, 10, 25, 14, 30, 59),
                        datetime(2006, 10, 25, 14, 30, 59),
                    ),
                    (
                        datetime(2006, 10, 25, 14, 30, 59, 200),
                        datetime(2006, 10, 25, 14, 30, 59, 200),
                    ),
                    ("2006 10 25 2:30 PM", datetime(2006, 10, 25, 14, 30)),
                    # ISO-like formats are always accepted.
                    ("2006-10-25 14:30:45", datetime(2006, 10, 25, 14, 30, 45)),
                ),
            ),
            (
                "%Y.%m.%d %H:%M:%S.%f",
                (
                    (
                        "2006.10.25 14:30:45.0002",
                        datetime(2006, 10, 25, 14, 30, 45, 200),
                    ),
                ),
            ),
        ]
        for input_format, values in tests:
            f = DateTimeField(input_formats=[input_format])
            for value, expected_datetime in values:
                with self.subTest(value=value, input_format=input_format):
                    self.assertEqual(f.clean(value), expected_datetime)

    def test_datetimefield_not_required(self):
        f = DateTimeField(required=False)
        self.assertIsNone(f.clean(None))
        self.assertEqual("None", repr(f.clean(None)))
        self.assertIsNone(f.clean(""))
        self.assertEqual("None", repr(f.clean("")))

    def test_datetimefield_changed(self):
        f = DateTimeField(input_formats=["%Y %m %d %I:%M %p"])
        d = datetime(2006, 9, 17, 14, 30, 0)
        self.assertFalse(f.has_changed(d, "2006 09 17 2:30 PM"))