"""CalDAV client pure helpers — XML multistatus / REPORT parsing + ICS round-trip."""

from __future__ import annotations

from datetime import UTC, datetime

from webmail_plugin_calendar.caldav import (
    build_ics,
    event_href,
    parse_href,
    parse_multistatus_calendars,
    parse_report,
    vevent_to_fields,
)

_PRINCIPAL_XML = """<?xml version="1.0"?>
<d:multistatus xmlns:d="DAV:">
  <d:response><d:href>/</d:href><d:propstat><d:status>HTTP/1.1 200 OK</d:status>
    <d:prop><d:current-user-principal><d:href>/123/principal/</d:href></d:current-user-principal></d:prop>
  </d:propstat></d:response>
</d:multistatus>"""

_CAL_LIST_XML = """<?xml version="1.0"?>
<d:multistatus xmlns:d="DAV:" xmlns:c="urn:ietf:params:xml:ns:caldav"
  xmlns:cs="http://calendarserver.org/ns/" xmlns:ical="http://apple.com/ns/ical/">
  <d:response><d:href>/123/calendars/home/</d:href><d:propstat><d:status>HTTP/1.1 200 OK</d:status>
    <d:prop><d:resourcetype><d:collection/></d:resourcetype></d:prop></d:propstat></d:response>
  <d:response><d:href>/123/calendars/work/</d:href><d:propstat><d:status>HTTP/1.1 200 OK</d:status>
    <d:prop>
      <d:resourcetype><d:collection/><c:calendar/></d:resourcetype>
      <d:displayname>Work</d:displayname>
      <ical:calendar-color>#ff0000ff</ical:calendar-color>
      <cs:getctag>ctag-42</cs:getctag>
      <d:current-user-privilege-set><d:privilege><d:write/></d:privilege></d:current-user-privilege-set>
      <c:supported-calendar-component-set>
        <c:comp name="VEVENT"/></c:supported-calendar-component-set>
    </d:prop></d:propstat></d:response>
  <d:response><d:href>/123/calendars/holidays/</d:href><d:propstat>
    <d:status>HTTP/1.1 200 OK</d:status>
    <d:prop>
      <d:resourcetype><d:collection/><c:calendar/></d:resourcetype>
      <d:displayname>Holidays</d:displayname>
      <d:current-user-privilege-set><d:privilege><d:read/></d:privilege></d:current-user-privilege-set>
      <c:supported-calendar-component-set>
        <c:comp name="VEVENT"/></c:supported-calendar-component-set>
    </d:prop></d:propstat></d:response>
</d:multistatus>"""

_REPORT_XML = """<?xml version="1.0"?>
<d:multistatus xmlns:d="DAV:" xmlns:c="urn:ietf:params:xml:ns:caldav">
  <d:response><d:href>/123/calendars/work/ev1.ics</d:href><d:propstat>
    <d:status>HTTP/1.1 200 OK</d:status>
    <d:prop><d:getetag>"etag-1"</d:getetag>
    <c:calendar-data>BEGIN:VCALENDAR
VERSION:2.0
BEGIN:VEVENT
UID:ev1@example.com
SUMMARY:Standup
DTSTART:20260810T090000Z
DTEND:20260810T091500Z
END:VEVENT
END:VCALENDAR</c:calendar-data></d:prop></d:propstat></d:response>
</d:multistatus>"""


def test_parse_href_principal() -> None:
    assert parse_href(_PRINCIPAL_XML, "{DAV:}current-user-principal") == "/123/principal/"


def test_parse_calendar_list_filters_and_reads_props() -> None:
    cals = parse_multistatus_calendars(_CAL_LIST_XML, "https://dav.example.com/123/calendars/")
    # The home collection (no <calendar> resourcetype) is skipped; two calendars remain.
    by_name = {c.name: c for c in cals}
    assert set(by_name) == {"Work", "Holidays"}
    work = by_name["Work"]
    assert work.url == "https://dav.example.com/123/calendars/work/"
    assert work.color == "#ff0000"  # trimmed to #rrggbb
    assert work.ctag == "ctag-42"
    assert work.read_only is False  # has <write>
    assert by_name["Holidays"].read_only is True  # read privilege only


def test_parse_report_events() -> None:
    events = parse_report(_REPORT_XML, "https://dav.example.com/123/calendars/work/")
    assert len(events) == 1
    ev = events[0]
    assert ev.href == "https://dav.example.com/123/calendars/work/ev1.ics"
    assert ev.etag == "etag-1"  # quotes stripped
    fields = vevent_to_fields(ev.ics)
    assert fields is not None
    assert fields["ical_uid"] == "ev1@example.com"
    assert fields["summary"] == "Standup"
    assert fields["dtstart"] == datetime(2026, 8, 10, 9, 0, tzinfo=UTC)
    assert fields["all_day"] is False


def test_build_ics_roundtrips() -> None:
    ics = build_ics(
        {
            "ical_uid": "made@ultimo",
            "summary": "Lunch",
            "location": "Cafe",
            "dtstart": datetime(2026, 8, 11, 12, 0, tzinfo=UTC),
            "dtend": datetime(2026, 8, 11, 13, 0, tzinfo=UTC),
            "all_day": False,
            "rrule": "FREQ=WEEKLY;BYDAY=MO",
        }
    )
    fields = vevent_to_fields(ics)
    assert fields is not None
    assert fields["ical_uid"] == "made@ultimo"
    assert fields["summary"] == "Lunch"
    assert fields["location"] == "Cafe"
    assert fields["rrule"] == "FREQ=WEEKLY;BYDAY=MO"
    assert fields["dtstart"] == datetime(2026, 8, 11, 12, 0, tzinfo=UTC)


def test_event_href() -> None:
    assert (
        event_href("https://dav.example.com/cal/work", "abc@ex")
        == "https://dav.example.com/cal/work/abc@ex.ics"
    )