from datetime import datetime

import pytest

from cronlite import CronExpression, cron_weekday, next_after
from cronlite.fields import DAY_OF_WEEK, HOUR, MINUTE, parse_field


def test_star_field():
    assert parse_field(MINUTE, "*") == set(range(60))


def test_single_value_field():
    assert parse_field(MINUTE, "17") == {17}


def test_list_field():
    assert parse_field(MINUTE, "0,15,30,45") == {0, 15, 30, 45}


def test_list_with_range():
    assert parse_field(MINUTE, "0,10-12") == {0, 10, 11, 12}


def test_range_field():
    assert parse_field(HOUR, "9-11") == {9, 10, 11}


def test_star_step_field():
    assert parse_field(MINUTE, "*/15") == {0, 15, 30, 45}


def test_range_step_field():
    assert parse_field(MINUTE, "1-10/3") == {1, 4, 7, 10}


def test_out_of_range_rejected():
    with pytest.raises(ValueError):
        parse_field(MINUTE, "60")
    with pytest.raises(ValueError):
        parse_field(HOUR, "24")


def test_bad_step_rejected():
    with pytest.raises(ValueError):
        parse_field(MINUTE, "*/0")


def test_descending_range_rejected():
    with pytest.raises(ValueError):
        parse_field(MINUTE, "10-1")


def test_weekday_field_within_zero_to_six():
    assert parse_field(DAY_OF_WEEK, "1-5") == {1, 2, 3, 4, 5}


def test_cron_weekday_mapping():
    assert cron_weekday(datetime(2026, 3, 4)) == 3
    assert cron_weekday(datetime(2026, 3, 8)) == 0


def test_matches_every_minute():
    expr = CronExpression("* * * * *")
    assert expr.matches(datetime(2026, 3, 4, 5, 6))


def test_matches_rejects_wrong_minute():
    expr = CronExpression("30 9 * * *")
    assert not expr.matches(datetime(2026, 3, 4, 9, 31))


def test_next_after_basic():
    expr = CronExpression("30 9 * * *")
    assert next_after(expr, datetime(2026, 3, 4, 5, 6)) == datetime(2026, 3, 4, 9, 30)


def test_next_after_is_strict():
    expr = CronExpression("30 9 * * *")
    assert next_after(expr, datetime(2026, 3, 4, 9, 30)) == datetime(2026, 3, 5, 9, 30)


def test_next_after_rolls_to_next_day():
    expr = CronExpression("0 0 * * *")
    assert next_after(expr, datetime(2026, 3, 4, 0, 0)) == datetime(2026, 3, 5, 0, 0)


def test_next_after_accepts_string():
    assert next_after("*/30 * * * *", datetime(2026, 3, 4, 5, 6)) == datetime(2026, 3, 4, 5, 30)


def test_invalid_field_count():
    with pytest.raises(ValueError):
        CronExpression("* * * *")


def test_str_roundtrip():
    assert str(CronExpression("  0   12  *  *  * ")) == "0 12 * * *"