import unittest
from datetime import datetime, timedelta

import pytest

from icalendar.prop import vPeriod


class TestProp(unittest.TestCase):
    def test_one_day(self):
        # One day in exact datetimes
        per = (datetime(2000, 1, 1), datetime(2000, 1, 2))
        assert vPeriod(per).to_ical() == b"20000101T000000/20000102T000000"

        per = (datetime(2000, 1, 1), timedelta(days=31))
        assert vPeriod(per).to_ical() == b"20000101T000000/P31D"

    def test_roundtrip(self):
        p = vPeriod.from_ical("20000101T000000/20000102T000000")
        assert p == (datetime(2000, 1, 1, 0, 0), datetime(2000, 1, 2, 0, 0))
        assert vPeriod(p).to_ical() == b"20000101T000000/20000102T000000"

        assert vPeriod.from_ical("20000101T000000/P31D") == (
            datetime(2000, 1, 1, 0, 0),
            timedelta(31),
        )

    def test_round_trip_with_absolute_time(self):
        p = vPeriod.from_ical("20000101T000000Z/20000102T000000Z")
        assert vPeriod(p).to_ical() == b"20000101T000000Z/20000102T000000Z"

    def test_bad_input(self):
        self.assertRaises(ValueError, vPeriod.from_ical, "20000101T000000/Psd31D")


def test_timezoned(tzp):
    start = tzp.localize(datetime(2000, 1, 1), "Europe/Copenhagen")
    end = tzp.localize(datetime(2000, 1, 2), "Europe/Copenhagen")
    per = (start, end)
    assert vPeriod(per).to_ical() == b"20000101T000000/20000102T000000"
    assert vPeriod(per).params["TZID"] == "Europe/Copenhagen"


def test_timezoned_with_timedelta(tzp):
    p = vPeriod(
        (tzp.localize(datetime(2000, 1, 1), "Europe/Copenhagen"), timedelta(days=31))
    )
    assert p.to_ical() == b"20000101T000000/P31D"


@pytest.mark.parametrize(
    ("period", "error"),
    [
        (("20000101T000000", datetime(2000, 1, 2)), TypeError),
        ((datetime(2000, 1, 1), "20000102T000000"), TypeError),
        ((datetime(2000, 1, 2), datetime(2000, 1, 1)), ValueError),
        ((datetime(2000, 1, 2), timedelta(-1)), ValueError),
    ],
)
def test_invalid_parameters(period, error):
    """The parameters are of wrong type or of wrong order."""
    with pytest.raises(error):
        vPeriod(period)