"""
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.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)),
    (1494012444.883309, date(2017, 5, 5)),
    ('1494012444', date(2017, 5, 5)),
    (1494012444, date(2017, 5, 5)),
    ('2012-04-23', date(2012, 4, 23)),
    ('2012-4-9', date(2012, 4, 9)),
    # Invalid inputs
    ('x20120423', ValueError),
    ('2012-04-56', ValueError),
])
def test_date_parsing(value, result):
    if result == ValueError:
        with pytest.raises(ValueError):
            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, 400000)),
    ('4:8:16', time(4, 8, 16)),
    # Invalid inputs
    ('091500', ValueError),
    ('09:15:90', ValueError),
])
def test_time_parsing(value, result):
    if result == ValueError:
        with pytest.raises(ValueError):
            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, 883309, tzinfo=timezone.utc)),
    (1494012444.883309, datetime(2017, 5, 5, 19, 27, 24, 883309, tzinfo=timezone.utc)),
    ('1494012444', datetime(2017, 5, 5, 19, 27, 24, tzinfo=timezone.utc)),
    (1494012444, 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, 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, 400000, create_tz(150))),
    ('2012-04-23T10:20:30.400+02', datetime(2012, 4, 23, 10, 20, 30, 400000, create_tz(120))),
    ('2012-04-23T10:20:30.400-02', datetime(2012, 4, 23, 10, 20, 30, 400000, create_tz(-120))),
    # Invalid inputs
    ('x20120423091500', ValueError),
    ('2012-04-56T09:15:90', ValueError),
])
def test_datetime_parsing(value, result):
    if result == ValueError:
        with pytest.raises(ValueError):
            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(format(delta)) == delta


@pytest.mark.parametrize('value,result', [
    # seconds
    ('30', timedelta(seconds=30)),
    (30, timedelta(seconds=30)),
    (30.1, timedelta(seconds=30, milliseconds=100)),
    # 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)),
    # 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', ValueError),
    ('P4M', ValueError),
    ('P4W', ValueError),
    ('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)),
])
def test_parse_durations(value, result):
    if result == ValueError:
        with pytest.raises(ValueError):
            parse_duration(value)
    else:
        assert parse_duration(value) == result