"""
Router "aggregate" provides:

- listing aggregate calendars
- finding aggregate calendars by name prefix
- getting aggregate calendar events by name prefix
"""

from logging import getLogger
from typing import Iterator

from fastapi import APIRouter, Depends
from ovdashboard_api.config import Config

from ...dav_calendar import CalEvent, DavCalendar
from ._common import AggregateNameLister, PrefixFinder, PrefixUnique
from .calendar import calendar_unique

_logger = getLogger(__name__)

router = APIRouter(prefix="/aggregate", tags=["calendar"])

aggregate_lister = AggregateNameLister()
aggregate_finder = PrefixFinder(aggregate_lister)
aggregate_unique = PrefixUnique(aggregate_finder)


@router.on_event("startup")
async def start_router() -> None:
    _logger.debug(f"{router.prefix} router starting.")


@router.get("/list", response_model=list[str])
async def list_aggregate_calendars(
    names: Iterator[str] = Depends(aggregate_lister),
) -> list[str]:
    return list(names)


@router.get("/find/{prefix}", response_model=list[str])
async def find_aggregate_calendars(
    names: Iterator[str] = Depends(aggregate_finder),
) -> list[str]:
    return list(names)


@router.get("/get/{prefix}", response_model=list[CalEvent])
async def get_aggregate_calendar(
    name: str = Depends(aggregate_unique),
) -> list[CalEvent]:
    cfg = await Config.get()
    aggregate = cfg.calendar.aggregates[name]

    calendars = (
        DavCalendar(await calendar_unique(cal_prefix))
        for cal_prefix in aggregate
    )

    return sorted([
        event
        async for calendar in calendars  # type: ignore
        for event in (await calendar.events)
    ])