from datetime import UTC, datetime

import pytest

from pigway_frame_flow.errors import FlowError
from pigway_frame_flow.providers.ical import calendar_events


def feed(properties):
    return (
        "BEGIN:VCALENDAR\r\nBEGIN:VEVENT\r\n"
        + properties
        + "\r\nEND:VEVENT\r\nEND:VCALENDAR"
    ).encode()


def test_recurring_event_exclusions_and_folded_title():
    result = calendar_events(
        feed(
            "UID:one\r\nDTSTART:20261008T080000Z\r\nRRULE:FREQ=DAILY;COUNT=3\r\nEXDATE:20261009T080000Z\r\nSUMMARY:Family\r\n  time"
        ),
        datetime(2026, 10, 8, tzinfo=UTC),
    )
    assert len(result["events"]) == 2
    assert result["events"][0]["title"] == "Family time"
    assert result["events"][1]["start"].startswith("2026-10-10")


def test_cancelled_event_ignored():
    assert (
        calendar_events(
            feed("DTSTART:20261008T080000Z\r\nSTATUS:CANCELLED\r\nSUMMARY:Cancelled"),
            datetime(2026, 10, 8, tzinfo=UTC),
        )["events"]
        == []
    )


def test_high_frequency_rejected():
    with pytest.raises(FlowError):
        calendar_events(
            feed("DTSTART:20261008T080000Z\r\nRRULE:FREQ=SECONDLY\r\nSUMMARY:Bad"),
            datetime(2026, 10, 8, tzinfo=UTC),
        )


def test_timezone_and_past_filter():
    events = calendar_events(
        feed("DTSTART;TZID=Asia/Shanghai:20261008T090000\r\nSUMMARY:Meeting"),
        datetime(2026, 10, 8, tzinfo=UTC),
    )["events"]
    assert len(events) == 1
    assert events[0]["start"].endswith("+08:00")
    assert (
        calendar_events(
            feed("DTSTART:20260101T090000Z\r\nSUMMARY:Past"),
            datetime(2026, 10, 8, tzinfo=UTC),
        )["events"]
        == []
    )