import datetime as dt
from cron_next import parse

def test_every_minute():
    c = parse("* * * * *")
    t = dt.datetime(2026,1,1,0,0)
    assert c.next(t) == dt.datetime(2026,1,1,0,1)

def test_specific():
    c = parse("30 14 * * *")
    t = dt.datetime(2026,1,1,10,0)
    assert c.next(t) == dt.datetime(2026,1,1,14,30)

def test_dow_restricted():
    # Mondays at 09:00
    c = parse("0 9 * * 1")
    # 2026-01-05 is Monday
    t = dt.datetime(2026,1,4,10,0)
    assert c.next(t) == dt.datetime(2026,1,5,9,0)

def test_dom_and_dow_or():
    # dom=1 OR dow=monday
    c = parse("0 0 1 * 1")
    # 2026-02-01 is Sunday; next monday is Feb 2; but dom=1 matches Feb1 midnight already? after Jan 2 00:00
    t = dt.datetime(2026,1,2,0,1)
    # next match: Feb1 00:00 (dom) since before Monday Feb2
    assert c.next(t) == dt.datetime(2026,1,5,0,0)

def test_step_and_range():
    c = parse("*/15 9-17 * * *")
    t = dt.datetime(2026,1,1,8,50)
    assert c.next(t) == dt.datetime(2026,1,1,9,0)

def test_names():
    c = parse("0 0 1 jan *")
    t = dt.datetime(2025,6,1,0,0)
    assert c.next(t) == dt.datetime(2026,1,1,0,0)

def test_invalid_fields():
    try:
        parse("* * * *")
        assert False
    except ValueError:
        pass

def test_dow_sunday_7():
    c = parse("0 0 * * 7")
    # sunday
    t = dt.datetime(2026,1,3,0,1) # sat
    assert c.next(t) == dt.datetime(2026,1,4,0,0)