from __future__ import annotations

import unittest

from govoplan_calendar.backend.ical import event_to_ics, parse_vevent


class ICalendarParsingTests(unittest.TestCase):
    def test_parse_vevent_preserves_unknown_properties_and_params(self) -> None:
        payload = """BEGIN:VCALENDAR
VERSION:2.0
BEGIN:VEVENT
UID:event-1@example.test
DTSTAMP:20260707T080000Z
DTSTART;TZID=Europe/Berlin:20260708T090000
DTEND;TZID=Europe/Berlin:20260708T100000
SUMMARY:Planning
ATTENDEE;CN=Ada;ROLE=REQ-PARTICIPANT:mailto:ada@example.test
RRULE:FREQ=WEEKLY;COUNT=3
X-GOVOPLAN-CUSTOM:kept
END:VEVENT
END:VCALENDAR
"""
        event = parse_vevent(payload)

        self.assertEqual(event["uid"], "event-1@example.test")
        self.assertEqual(event["summary"], "Planning")
        self.assertEqual(event["timezone"], "Europe/Berlin")
        self.assertEqual(event["rrule"], {"FREQ": "WEEKLY", "COUNT": "3"})
        self.assertEqual(event["attendees"][0]["params"]["CN"], ["Ada"])
        property_names = [item["name"] for item in event["icalendar"]["properties"]]
        self.assertIn("X-GOVOPLAN-CUSTOM", property_names)

    def test_parse_all_day_event(self) -> None:
        event = parse_vevent(
            """BEGIN:VCALENDAR
VERSION:2.0
BEGIN:VEVENT
UID:event-2@example.test
DTSTART;VALUE=DATE:20260708
DTEND;VALUE=DATE:20260709
SUMMARY:All day
END:VEVENT
END:VCALENDAR
"""
        )

        self.assertTrue(event["all_day"])
        self.assertEqual(event["start_at"].hour, 0)

    def test_generated_ics_contains_required_vevent_fields(self) -> None:
        class Event:
            uid = "event-3@example.test"
            start_at = parse_vevent(
                """BEGIN:VCALENDAR
BEGIN:VEVENT
UID:x
DTSTART:20260708T090000Z
SUMMARY:x
END:VEVENT
END:VCALENDAR
"""
            )["start_at"]
            end_at = None
            all_day = False
            timezone = None
            summary = "Generated"
            sequence = 0
            status = "CONFIRMED"
            transparency = "OPAQUE"
            classification = "PUBLIC"
            description = None
            location = None
            categories = []
            rrule = None
            organizer = None
            attendees = []

        ics = event_to_ics(Event())

        self.assertIn("BEGIN:VEVENT", ics)
        self.assertIn("UID:event-3@example.test", ics)
        self.assertIn("SUMMARY:Generated", ics)


if __name__ == "__main__":
    unittest.main()