# -*- coding: utf-8 -*-
from datetime import datetime

import pytest

from pandas._libs import tslib


@pytest.mark.parametrize("date_str, exp", [
    ("2011-01-02", datetime(2011, 1, 2)),
    ("2011-1-2", datetime(2011, 1, 2)),
    ("2011-01", datetime(2011, 1, 1)),
    ("2011-1", datetime(2011, 1, 1)),
    ("2011 01 02", datetime(2011, 1, 2)),
    ("2011.01.02", datetime(2011, 1, 2)),
    ("2011/01/02", datetime(2011, 1, 2)),
    ("2011\\01\\02", datetime(2011, 1, 2)),
    ("2013-01-01 05:30:00", datetime(2013, 1, 1, 5, 30)),
    ("2013-1-1 5:30:00", datetime(2013, 1, 1, 5, 30))])
def test_parsers_iso8601(date_str, exp):
    # see gh-12060
    #
    # Test only the ISO parser - flexibility to
    # different separators and leading zero's.
    actual = tslib._test_parse_iso8601(date_str)
    assert actual == exp


@pytest.mark.parametrize("date_str", [
    "2011-01/02",
    "2011=11=11",
    "201401",
    "201111",
    "200101",

    # Mixed separated and unseparated.
    "2005-0101",
    "200501-01",
    "20010101 12:3456",
    "20010101 1234:56",

    # HHMMSS must have two digits in
    # each component if unseparated.
    "20010101 1",
    "20010101 123",
    "20010101 12345",
    "20010101 12345Z",
])
def test_parsers_iso8601_invalid(date_str):
    msg = "Error parsing datetime string \"{s}\"".format(s=date_str)

    with pytest.raises(ValueError, match=msg):
        tslib._test_parse_iso8601(date_str)


def test_parsers_iso8601_invalid_offset_invalid():
    date_str = "2001-01-01 12-34-56"
    msg = ("Timezone hours offset out of range "
           "in datetime string \"{s}\"".format(s=date_str))

    with pytest.raises(ValueError, match=msg):
        tslib._test_parse_iso8601(date_str)