"""
Stolen from https://github.com/django/django/blob/master/tests/utils_tests/test_dateparse.py at
9718fa2e8abe430c3526a9278dd976443d4ae3c6

Changed to:
* use standard pytest layout
* parametrize tests
"""
from datetime import date, datetime, time, timedelta, timezone

import pytest

from pydantic import BaseModel, ValidationError, errors
from pydantic.datetime_parse import parse_date, parse_datetime, parse_duration, parse_time


def create_tz(minutes):
    return timezone(timedelta(minutes=minutes))


@pytest.mark.parametrize(
    'value,result',
    [
        # Valid inputs
        ('1494012444.883309', date(2017, 5, 5)),
        (b'1494012444.883309', date(2017, 5, 5)),
        (1_494_012_444.883_309, date(2017, 5, 5)),
        ('1494012444', date(2017, 5, 5)),
        (1_494_012_444, date(2017, 5, 5)),
        (0, date(1970, 1, 1)),
        ('2012-04-23', date(2012, 4, 23)),
        (b'2012-04-23', date(2012, 4, 23)),
        ('2012-4-9', date(2012, 4, 9)),
        (date(2012, 4, 9), date(2012, 4, 9)),
        (datetime(2012, 4, 9, 12, 15), date(2012, 4, 9)),
        # Invalid inputs
        ('x20120423', errors.DateError),
        ('2012-04-56', errors.DateError),
        (19_999_999_999, date(2603, 10, 11)),  # just before watershed
        (20_000_000_001, date(1970, 8, 20)),  # just after watershed
        (1_549_316_052, date(2019, 2, 4)),  # nowish in s
        (1_549_316_052_104, date(2019, 2, 4)),  # nowish in ms
        (1_549_316_052_104_324, date(2019, 2, 4)),  # nowish in μs
        (1_549_316_052_104_324_096, date(2019, 2, 4)),  # nowish in ns
        ('infinity', date(9999, 12, 31)),
        ('inf', date(9999, 12, 31)),
        (float('inf'), date(9999, 12, 31)),
        ('infinity ', date(9999, 12, 31)),
        (int('1' + '0' * 100), date(9999, 12, 31)),
        (1e1000, date(9999, 12, 31)),
        ('-infinity', date(1, 1, 1)),
        ('-inf', date(1, 1, 1)),
        ('nan', ValueError),
    ],
)
def test_date_parsing(value, result):
    if type(result) == type and issubclass(result, Exception):
        with pytest.raises(result):
            parse_date(value)
    else:
        assert parse_date(value) == result


@pytest.mark.parametrize(
    'value,result',
    [
        # Valid inputs
        ('09:15:00', time(9, 15)),
        ('10:10', time(10, 10)),
        ('10:20:30.400', time(10, 20, 30, 400_000)),
        (b'10:20:30.400', time(10, 20, 30, 400_000)),
        ('4:8:16', time(4, 8, 16)),
        (time(4, 8, 16), time(4, 8, 16)),
        (3610, time(1, 0, 10)),
        (3600.5, time(1, 0, 0, 500000)),
        (86400 - 1, time(23, 59, 59)),
        ('11:05:00-05:30', time(11, 5, 0, tzinfo=create_tz(-330))),
        ('11:05:00-0530', time(11, 5, 0, tzinfo=create_tz(-330))),
        ('11:05:00Z', time(11, 5, 0, tzinfo=timezone.utc)),
        ('11:05:00+00', time(11, 5, 0, tzinfo=timezone.utc)),
        ('11:05-06', time(11, 5, 0, tzinfo=create_tz(-360))),
        ('11:05+06', time(11, 5, 0, tzinfo=create_tz(360))),
        # Invalid inputs
        (86400, errors.TimeError),
        ('xxx', errors.TimeError),
        ('091500', errors.TimeError),
        (b'091500', errors.TimeError),
        ('09:15:90', errors.TimeError),
        ('11:05:00Y', errors.TimeError),
        ('11:05:00-25:00', errors.TimeError),
    ],
)
def test_time_parsing(value, result):
    if result == errors.TimeError:
        with pytest.raises(errors.TimeError):
            parse_time(value)
    else:
        assert parse_time(value) == result


@pytest.mark.parametrize(
    'value,result',
    [
        # Valid inputs
        # values in seconds
        ('1494012444.883309', datetime(2017, 5, 5, 19, 27, 24, 883_309, tzinfo=timezone.utc)),
        (1_494_012_444.883_309, datetime(2017, 5, 5, 19, 27, 24, 883_309, tzinfo=timezone.utc)),
        ('1494012444', datetime(2017, 5, 5, 19, 27, 24, tzinfo=timezone.utc)),
        (b'1494012444', datetime(2017, 5, 5, 19, 27, 24, tzinfo=timezone.utc)),
        (1_494_012_444, datetime(2017, 5, 5, 19, 27, 24, tzinfo=timezone.utc)),
        # values in ms
        ('1494012444000.883309', datetime(2017, 5, 5, 19, 27, 24, 883, tzinfo=timezone.utc)),
        ('-1494012444000.883309', datetime(1922, 8, 29, 4, 32, 35, 999117, tzinfo=timezone.utc)),
        (1_494_012_444_000, datetime(2017, 5, 5, 19, 27, 24, tzinfo=timezone.utc)),
        ('2012-04-23T09:15:00', datetime(2012, 4, 23, 9, 15)),
        ('2012-4-9 4:8:16', datetime(2012, 4, 9, 4, 8, 16)),
        ('2012-04-23T09:15:00Z', datetime(2012, 4, 23, 9, 15, 0, 0, timezone.utc)),
        ('2012-4-9 4:8:16-0320', datetime(2012, 4, 9, 4, 8, 16, 0, create_tz(-200))),
        ('2012-04-23T10:20:30.400+02:30', datetime(2012, 4, 23, 10, 20, 30, 400_000, create_tz(150))),
        ('2012-04-23T10:20:30.400+02', datetime(2012, 4, 23, 10, 20, 30, 400_000, create_tz(120))),
        ('2012-04-23T10:20:30.400-02', datetime(2012, 4, 23, 10, 20, 30, 400_000, create_tz(-120))),
        (b'2012-04-23T10:20:30.400-02', datetime(2012, 4, 23, 10, 20, 30, 400_000, create_tz(-120))),
        (datetime(2017, 5, 5), datetime(2017, 5, 5)),
        (0, datetime(1970, 1, 1, 0, 0, 0, tzinfo=timezone.utc)),
        # Invalid inputs
        ('x20120423091500', errors.DateTimeError),
        ('2012-04-56T09:15:90', errors.DateTimeError),
        ('2012-04-23T11:05:00-25:00', errors.DateTimeError),
        (19_999_999_999, datetime(2603, 10, 11, 11, 33, 19, tzinfo=timezone.utc)),  # just before watershed
        (20_000_000_001, datetime(1970, 8, 20, 11, 33, 20, 1000, tzinfo=timezone.utc)),  # just after watershed
        (1_549_316_052, datetime(2019, 2, 4, 21, 34, 12, 0, tzinfo=timezone.utc)),  # nowish in s
        (1_549_316_052_104, datetime(2019, 2, 4, 21, 34, 12, 104_000, tzinfo=timezone.utc)),  # nowish in ms
        (1_549_316_052_104_324, datetime(2019, 2, 4, 21, 34, 12, 104_324, tzinfo=timezone.utc)),  # nowish in μs
        (1_549_316_052_104_324_096, datetime(2019, 2, 4, 21, 34, 12, 104_324, tzinfo=timezone.utc)),  # nowish in ns
        ('infinity', datetime(9999, 12, 31, 23, 59, 59, 999999)),
        ('inf', datetime(9999, 12, 31, 23, 59, 59, 999999)),
        ('inf ', datetime(9999, 12, 31, 23, 59, 59, 999999)),
        (1e50, datetime(9999, 12, 31, 23, 59, 59, 999999)),
        (float('inf'), datetime(9999, 12, 31, 23, 59, 59, 999999)),
        ('-infinity', datetime(1, 1, 1, 0, 0)),
        ('-inf', datetime(1, 1, 1, 0, 0)),
        ('nan', ValueError),
    ],
)
def test_datetime_parsing(value, result):
    if type(result) == type and issubclass(result, Exception):
        with pytest.raises(result):
            parse_datetime(value)
    else:
        assert parse_datetime(value) == result


@pytest.mark.parametrize(
    'delta',
    [
        timedelta(days=4, minutes=15, seconds=30, milliseconds=100),  # fractions of seconds
        timedelta(hours=10, minutes=15, seconds=30),  # hours, minutes, seconds
        timedelta(days=4, minutes=15, seconds=30),  # multiple days
        timedelta(days=1, minutes=00, seconds=00),  # single day
        timedelta(days=-4, minutes=15, seconds=30),  # negative durations
        timedelta(minutes=15, seconds=30),  # minute & seconds
        timedelta(seconds=30),  # seconds
    ],
)
def test_parse_python_format(delta):
    assert parse_duration(delta) == delta
    assert parse_duration(str(delta)) == delta


@pytest.mark.parametrize(
    'value,result',
    [
        # seconds
        (timedelta(seconds=30), timedelta(seconds=30)),
        ('30', timedelta(seconds=30)),
        (30, timedelta(seconds=30)),
        (30.1, timedelta(seconds=30, milliseconds=100)),
        (9.9e-05, timedelta(microseconds=99)),
        # minutes seconds
        ('15:30', timedelta(minutes=15, seconds=30)),
        ('5:30', timedelta(minutes=5, seconds=30)),
        # hours minutes seconds
        ('10:15:30', timedelta(hours=10, minutes=15, seconds=30)),
        ('1:15:30', timedelta(hours=1, minutes=15, seconds=30)),
        ('100:200:300', timedelta(hours=100, minutes=200, seconds=300)),
        # days
        ('4 15:30', timedelta(days=4, minutes=15, seconds=30)),
        ('4 10:15:30', timedelta(days=4, hours=10, minutes=15, seconds=30)),
        # fractions of seconds
        ('15:30.1', timedelta(minutes=15, seconds=30, milliseconds=100)),
        ('15:30.01', timedelta(minutes=15, seconds=30, milliseconds=10)),
        ('15:30.001', timedelta(minutes=15, seconds=30, milliseconds=1)),
        ('15:30.0001', timedelta(minutes=15, seconds=30, microseconds=100)),
        ('15:30.00001', timedelta(minutes=15, seconds=30, microseconds=10)),
        ('15:30.000001', timedelta(minutes=15, seconds=30, microseconds=1)),
        (b'15:30.000001', timedelta(minutes=15, seconds=30, microseconds=1)),
        # negative
        ('-4 15:30', timedelta(days=-4, minutes=15, seconds=30)),
        ('-172800', timedelta(days=-2)),
        ('-15:30', timedelta(minutes=-15, seconds=30)),
        ('-1:15:30', timedelta(hours=-1, minutes=15, seconds=30)),
        ('-30.1', timedelta(seconds=-30, milliseconds=-100)),
        # iso_8601
        ('P4Y', errors.DurationError),
        ('P4M', errors.DurationError),
        ('P4W', errors.DurationError),
        ('P4D', timedelta(days=4)),
        ('P0.5D', timedelta(hours=12)),
        ('PT5H', timedelta(hours=5)),
        ('PT5M', timedelta(minutes=5)),
        ('PT5S', timedelta(seconds=5)),
        ('PT0.000005S', timedelta(microseconds=5)),
        (b'PT0.000005S', timedelta(microseconds=5)),
    ],
)
def test_parse_durations(value, result):
    if result == errors.DurationError:
        with pytest.raises(errors.DurationError):
            parse_duration(value)
    else:
        assert parse_duration(value) == result


@pytest.mark.parametrize(
    'field, value, error_message',
    [
        ('dt', [], 'invalid type; expected datetime, string, bytes, int or float'),
        ('dt', {}, 'invalid type; expected datetime, string, bytes, int or float'),
        ('dt', object, 'invalid type; expected datetime, string, bytes, int or float'),
        ('d', [], 'invalid type; expected date, string, bytes, int or float'),
        ('d', {}, 'invalid type; expected date, string, bytes, int or float'),
        ('d', object, 'invalid type; expected date, string, bytes, int or float'),
        ('t', [], 'invalid type; expected time, string, bytes, int or float'),
        ('t', {}, 'invalid type; expected time, string, bytes, int or float'),
        ('t', object, 'invalid type; expected time, string, bytes, int or float'),
        ('td', [], 'invalid type; expected timedelta, string, bytes, int or float'),
        ('td', {}, 'invalid type; expected timedelta, string, bytes, int or float'),
        ('td', object, 'invalid type; expected timedelta, string, bytes, int or float'),
    ],
)
def test_model_type_errors(field, value, error_message):
    class Model(BaseModel):
        dt: datetime = None
        d: date = None
        t: time = None
        td: timedelta = None

    with pytest.raises(ValidationError) as exc_info:
        Model(**{field: value})
    assert len(exc_info.value.errors()) == 1
    error = exc_info.value.errors()[0]
    assert error == {'loc': (field,), 'type': 'type_error', 'msg': error_message}


@pytest.mark.parametrize('field', ['dt', 'd', 't', 'dt'])
def test_unicode_decode_error(field):
    class Model(BaseModel):
        dt: datetime = None
        d: date = None
        t: time = None
        td: timedelta = None

    with pytest.raises(ValidationError) as exc_info:
        Model(**{field: b'\x81'})
    assert len(exc_info.value.errors()) == 1
    error = exc_info.value.errors()[0]
    assert error == {
        'loc': (field,),
        'type': 'value_error.unicodedecode',
        'msg': "'utf-8' codec can't decode byte 0x81 in position 0: invalid start byte",
    }


def test_nan():
    class Model(BaseModel):
        dt: datetime
        d: date

    with pytest.raises(ValidationError) as exc_info:
        Model(dt='nan', d='nan')
    assert exc_info.value.errors() == [
        {
            'loc': ('dt',),
            'msg': 'cannot convert float NaN to integer',
            'type': 'value_error',
        },
        {
            'loc': ('d',),
            'msg': 'cannot convert float NaN to integer',
            'type': 'value_error',
        },
    ]