"""Tests for Event component."""

from __future__ import annotations

from typing import Any
from datetime import date, datetime, timedelta, timezone
from unittest.mock import patch
import zoneinfo

import pytest
from pydantic import ValidationError

from ical.event import Event
from ical.exceptions import CalendarParseError
from ical.types.recur import Recur

SUMMARY = "test summary"
LOS_ANGELES = zoneinfo.ZoneInfo("America/Los_Angeles")


@pytest.mark.parametrize(
    "begin,end,duration",
    [
        (
            datetime.fromisoformat("2022-09-16 12:00"),
            datetime.fromisoformat("2022-09-16 12:30"),
            timedelta(minutes=30),
        ),
        (
            date.fromisoformat("2022-09-16"),
            date.fromisoformat("2022-09-17"),
            timedelta(hours=24),
        ),
        (
            datetime.fromisoformat("2022-09-16 06:00"),
            datetime.fromisoformat("2022-09-17 08:30"),
            timedelta(days=1, hours=2, minutes=30),
        ),
    ],
)
def test_start_end_duration(
    begin: datetime, end: datetime, duration: timedelta
) -> None:
    """Test event duration calculation."""
    event = Event(summary=SUMMARY, start=begin, end=end)
    assert event.computed_duration == duration
    assert not event.duration


@pytest.mark.parametrize(
    "event1_start,event1_end,event2_start,event2_end",
    [
        (date(2022, 9, 6), date(2022, 9, 7), date(2022, 9, 8), date(2022, 9, 10)),
        (
            datetime(2022, 9, 6, 6, 0, 0),
            datetime(2022, 9, 6, 7, 0, 0),
            datetime(2022, 9, 6, 8, 0, 0),
            datetime(2022, 9, 6, 8, 30, 0),
        ),
        (
            datetime(2022, 9, 6, 6, 0, 0, tzinfo=timezone.utc),
            datetime(2022, 9, 6, 7, 0, 0, tzinfo=timezone.utc),
            datetime(2022, 9, 6, 8, 0, 0, tzinfo=timezone.utc),
            datetime(2022, 9, 6, 8, 30, 0, tzinfo=timezone.utc),
        ),
        (
            datetime(2022, 9, 6, 6, 0, 0, tzinfo=LOS_ANGELES),
            datetime(2022, 9, 6, 7, 0, 0, tzinfo=LOS_ANGELES),
            datetime(2022, 9, 7, 8, 0, 0, tzinfo=timezone.utc),
            datetime(2022, 9, 7, 8, 30, 0, tzinfo=timezone.utc),
        ),
        (
            datetime(2022, 9, 6, 6, 0, 0, tzinfo=LOS_ANGELES),
            datetime(2022, 9, 6, 7, 0, 0, tzinfo=LOS_ANGELES),
            datetime(2022, 9, 8, 8, 0, 0),
            datetime(2022, 9, 8, 8, 30, 0),
        ),
        (
            datetime(2022, 9, 6, 6, 0, 0, tzinfo=LOS_ANGELES),
            datetime(2022, 9, 6, 7, 0, 0, tzinfo=LOS_ANGELES),
            date(2022, 9, 8),
            date(2022, 9, 9),
        ),
        (
            date(2022, 9, 6),
            date(2022, 9, 7),
            datetime(2022, 9, 6, 8, 0, 1, tzinfo=timezone.utc),
            datetime(2022, 9, 6, 8, 30, 0, tzinfo=timezone.utc),
        ),
    ],
)
def test_comparisons(
    event1_start: datetime | date,
    event1_end: datetime | date,
    event2_start: datetime | date,
    event2_end: datetime | date,
) -> None:
    """Test event comparison methods."""
    event1 = Event(summary=SUMMARY, start=event1_start, end=event1_end)
    event2 = Event(summary=SUMMARY, start=event2_start, end=event2_end)
    assert event1 < event2
    assert event1 <= event2
    assert event2 >= event1
    assert event2 > event1

    assert event1 <= event2
    assert event2 >= event1
    assert event2 > event1


def test_invalid_comparisons() -> None:
    """Test event comparisons that are not valid."""
    event1 = Event(summary=SUMMARY, start=date(2022, 9, 6), end=date(2022, 9, 7))

    with pytest.raises(TypeError):
        assert event1 < "example"

    with pytest.raises(TypeError):
        assert event1 <= "example"

    with pytest.raises(TypeError):
        assert event1 > "example"

    with pytest.raises(TypeError):
        assert event1 >= "example"


def test_within_and_includes() -> None:
    """Test more complex comparison methods."""
    event1 = Event(summary=SUMMARY, start=date(2022, 9, 6), end=date(2022, 9, 10))
    event2 = Event(summary=SUMMARY, start=date(2022, 9, 7), end=date(2022, 9, 8))
    event3 = Event(summary=SUMMARY, start=date(2022, 9, 9), end=date(2022, 9, 11))

    assert not event1.starts_within(event2)
    assert not event1.starts_within(event3)
    assert event2.starts_within(event1)
    assert not event2.starts_within(event3)
    assert event3.starts_within(event1)
    assert not event3.starts_within(event2)

    assert not event1.ends_within(event2)
    assert event1.ends_within(event3)
    assert event2.ends_within(event1)
    assert not event2.ends_within(event3)
    assert not event3.ends_within(event1)
    assert not event3.ends_within(event2)
    assert event2 > event1

    assert event1.includes(event2)
    assert not event1.includes(event3)
    assert not event2.includes(event1)
    assert not event2.includes(event3)
    assert not event3.includes(event1)
    assert not event3.includes(event2)

    assert not event1.is_included_in(event2)
    assert not event1.is_included_in(event3)
    assert event2.is_included_in(event1)
    assert not event2.is_included_in(event3)
    assert not event3.is_included_in(event1)
    assert not event3.is_included_in(event2)


def test_start_end_same_type() -> None:
    """Verify that the start and end value are the same type."""

    with pytest.raises(CalendarParseError):
        Event(
            summary=SUMMARY, start=date(2022, 9, 9), end=datetime(2022, 9, 9, 11, 0, 0)
        )

    with pytest.raises(CalendarParseError):
        Event(
            summary=SUMMARY, start=datetime(2022, 9, 9, 10, 0, 0), end=date(2022, 9, 9)
        )


def test_no_end_time_or_dur() -> None:
    """Verify that events with no end time or duration will use correct defaults."""

    day_event = Event(summary=SUMMARY, dtstart=date(2022, 9, 9))
    assert day_event.end == date(2022, 9, 10)
    assert day_event.duration is None
    assert day_event.computed_duration == timedelta(days=1)

    time_event = Event(summary=SUMMARY, dtstart=datetime(2022, 9, 9, 10, 0, 0))
    assert time_event.end == datetime(2022, 9, 9, 10, 0, 0)
    assert time_event.duration is None
    assert time_event.computed_duration == timedelta()


def test_start_end_local_time() -> None:
    """Verify that the start and end value are the same type."""

    # Valid
    Event(
        summary=SUMMARY,
        start=datetime(2022, 9, 9, 10, 0, 0),
        end=datetime(2022, 9, 9, 11, 0, 0),
    )
    Event(
        summary=SUMMARY,
        start=datetime(2022, 9, 9, 10, 0, 0, tzinfo=timezone.utc),
        end=datetime(2022, 9, 9, 11, 0, 0, tzinfo=timezone.utc),
    )

    with pytest.raises(CalendarParseError):
        Event(
            summary=SUMMARY,
            start=datetime(2022, 9, 9, 10, 0, 0, tzinfo=timezone.utc),
            end=datetime(2022, 9, 9, 11, 0, 0),
        )

    with pytest.raises(CalendarParseError):
        Event(
            summary=SUMMARY,
            start=datetime(2022, 9, 9, 10, 0, 0),
            end=datetime(2022, 9, 9, 11, 0, 0, tzinfo=timezone.utc),
        )


def test_start_and_duration() -> None:
    """Verify event created with a duration instead of explicit end time."""

    event = Event(summary=SUMMARY, start=date(2022, 9, 9), duration=timedelta(days=3))
    assert event.start == date(2022, 9, 9)
    assert event.end == date(2022, 9, 12)

    with pytest.raises(CalendarParseError):
        Event(summary=SUMMARY, start=date(2022, 9, 9), duration=timedelta(days=-3))

    with pytest.raises(CalendarParseError):
        Event(summary=SUMMARY, start=date(2022, 9, 9), duration=timedelta(seconds=60))

    event = Event(
        summary=SUMMARY,
        start=datetime(2022, 9, 9, 10, 0, 0),
        duration=timedelta(seconds=60),
    )
    assert event.start == datetime(2022, 9, 9, 10, 0, 0)
    assert event.end == datetime(2022, 9, 9, 10, 1, 0)
    assert event.duration == timedelta(seconds=60)
    assert event.computed_duration == timedelta(seconds=60)


@pytest.mark.parametrize(
    "range1,range2,expected",
    [
        (
            (date(2022, 8, 1), date(2022, 8, 2)),
            (date(2022, 8, 1), date(2022, 8, 2)),
            True,
        ),
        (
            (date(2022, 8, 1), date(2022, 8, 4)),
            (date(2022, 8, 2), date(2022, 8, 3)),
            True,
        ),
        (
            (date(2022, 8, 1), date(2022, 8, 3)),
            (date(2022, 8, 2), date(2022, 8, 4)),
            True,
        ),
        (
            (date(2022, 8, 2), date(2022, 8, 3)),
            (date(2022, 8, 1), date(2022, 8, 4)),
            True,
        ),
        (
            (date(2022, 8, 3), date(2022, 8, 4)),
            (date(2022, 8, 1), date(2022, 8, 4)),
            True,
        ),
        (
            (date(2022, 8, 2), date(2022, 8, 4)),
            (date(2022, 8, 1), date(2022, 8, 4)),
            True,
        ),
        (
            (date(2022, 8, 1), date(2022, 8, 2)),
            (date(2022, 8, 3), date(2022, 8, 4)),
            False,
        ),
        (
            (date(2022, 8, 3), date(2022, 8, 4)),
            (date(2022, 8, 1), date(2022, 8, 2)),
            False,
        ),
        (
            (date(2022, 8, 1), date(2022, 8, 2)),
            (date(2022, 8, 2), date(2022, 8, 3)),
            False,
        ),
        (
            (date(2022, 8, 2), date(2022, 8, 3)),
            (date(2022, 8, 1), date(2022, 8, 2)),
            False,
        ),
    ],
)
def test_date_intersects(
    range1: tuple[date, date],
    range2: tuple[date, date],
    expected: bool,
) -> None:
    """Test event intersection."""
    event1 = Event(summary=SUMMARY, start=range1[0], end=range1[1])
    event2 = Event(summary=SUMMARY, start=range2[0], end=range2[1])
    assert event1.intersects(event2) == expected


@pytest.mark.parametrize(
    "start_str,end_str,start,end",
    [
        (
            "2022-09-16 12:00",
            "2022-09-16 12:30",
            datetime(2022, 9, 16, 12, 0, 0),
            datetime(2022, 9, 16, 12, 30, 0),
        ),
        (
            "2022-09-16",
            "2022-09-17",
            date(2022, 9, 16),
            date(2022, 9, 17),
        ),
        (
            "2022-09-16 06:00",
            "2022-09-17 08:30",
            datetime(2022, 9, 16, 6, 0, 0),
            datetime(2022, 9, 17, 8, 30, 0),
        ),
        (
            "2022-09-16T06:00",
            "2022-09-17T08:30",
            datetime(2022, 9, 16, 6, 0, 0),
            datetime(2022, 9, 17, 8, 30, 0),
        ),
        (
            "2022-09-16T06:00Z",
            "2022-09-17T08:30Z",
            datetime(2022, 9, 16, 6, 0, 0, tzinfo=timezone.utc),
            datetime(2022, 9, 17, 8, 30, 0, tzinfo=timezone.utc),
        ),
        (
            "2022-09-16T06:00+00:00",
            "2022-09-17T08:30+00:00",
            datetime(2022, 9, 16, 6, 0, 0, tzinfo=timezone.utc),
            datetime(2022, 9, 17, 8, 30, 0, tzinfo=timezone.utc),
        ),
        (
            "2022-09-16T06:00-07:00",
            "2022-09-17T08:30-07:00",
            datetime(2022, 9, 16, 6, 0, 0, tzinfo=timezone(offset=timedelta(hours=-7))),
            datetime(
                2022, 9, 17, 8, 30, 0, tzinfo=timezone(offset=timedelta(hours=-7))
            ),
        ),
    ],
)
def test_parse_event_timezones(
    start_str: str, end_str: str, start: datetime | date, end: datetime | date
) -> None:
    """Test parsing date/times from strings."""
    event = Event.model_validate(
        {
            "summary": SUMMARY,
            "start": start_str,
            "end": end_str,
        }
    )
    assert event.start == start
    assert event.end == end


def test_all_day_timezones_default() -> None:
    """Test behavior of all day events interacting with timezones."""
    with patch(
        "ical.util.local_timezone", return_value=zoneinfo.ZoneInfo("America/Regina")
    ):
        event = Event(summary=SUMMARY, start=date(2022, 8, 1), end=date(2022, 8, 2))
        assert event.start_datetime == datetime(
            2022, 8, 1, 6, 0, 0, tzinfo=timezone.utc
        )
        assert event.end_datetime == datetime(2022, 8, 2, 6, 0, 0, tzinfo=timezone.utc)


@pytest.mark.parametrize(
    "dtstart,dtend",
    [
        (
            datetime(2022, 8, 1, 0, 0, 0, tzinfo=zoneinfo.ZoneInfo("America/Regina")),
            datetime(2022, 8, 2, 0, 0, 0, tzinfo=zoneinfo.ZoneInfo("America/Regina")),
        ),
        (
            datetime(
                2022, 8, 1, 0, 0, 0, tzinfo=zoneinfo.ZoneInfo("America/Los_Angeles")
            ),
            datetime(
                2022, 8, 2, 0, 0, 0, tzinfo=zoneinfo.ZoneInfo("America/Los_Angeles")
            ),
        ),
    ],
)
def test_all_day_timespan_timezone_explicit(dtstart: datetime, dtend: datetime) -> None:
    """Test behavior of all day events interacting with timezones specified explicitly."""
    event = Event(summary=SUMMARY, start=date(2022, 8, 1), end=date(2022, 8, 2))
    assert dtstart.tzinfo
    timespan = event.timespan_of(dtstart.tzinfo)
    assert timespan.start == dtstart
    assert timespan.end == dtend


def test_validate_assignment_1() -> None:
    """Test date type validations."""
    event = Event(summary=SUMMARY, start=date(2022, 9, 6), end=date(2022, 9, 7))

    # Validation on assignment ensures the start/end types can't be mismatched
    with pytest.raises(ValidationError):
        event.dtstart = datetime(2022, 9, 6, 6, 0, 0)


def test_validate_assignment_2() -> None:
    """Test date type validations."""
    event = Event(summary=SUMMARY, start=date(2022, 9, 6), end=date(2022, 9, 7))

    # Validation on assignment ensures the start/end types can't be mismatched
    with pytest.raises(ValidationError):
        event.dtend = datetime(2022, 9, 10, 6, 0, 0)


def test_validate_assignment_3() -> None:
    """Test date type validations."""
    event = Event(summary=SUMMARY, start=date(2022, 9, 6), end=date(2022, 9, 7))

    # But updates that are valid are OK
    event.dtstart = date(2022, 9, 5)
    event.dtend = date(2022, 9, 10)


@pytest.mark.parametrize(
    ("params"),
    [
        ({}),
        (
            {
                "end": datetime(2022, 9, 6, 6, 0, 0),
            }
        ),
        (
            {
                "duration": timedelta(hours=1),
            }
        ),
    ],
)
def test_validate_rrule_required_fields(params: dict[str, Any]) -> None:
    """Test that an event with an rrule requires a dtstart."""
    event = Event(
        summary="Event 1",
        rrule=Recur.from_rrule("FREQ=WEEKLY;BYDAY=WE,MO,TU,TH,FR;COUNT=3"),
        **params,
    )
    with pytest.raises(CalendarParseError):
        event.as_rrule()
