from datetime import datetime, timedelta
from typing import Iterator

from fastapi import APIRouter, Depends
from pydantic import BaseModel

from .. import caldav_principal
from ._common import CalendarNameLister, PrefixFinder, PrefixUnique

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

_lister = CalendarNameLister()
_finder = PrefixFinder(_lister)
_unique = PrefixUnique(_finder)


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


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


class CalEvent(BaseModel):
    summary: str
    description: str
    dtstart: datetime
    dtend: datetime


@router.get("/get/{prefix}", response_model=list[CalEvent])
async def get_calendar(
    name: Iterator[str] = Depends(_unique),
) -> list[CalEvent]:
    calendar = caldav_principal().calendar(name=name)

    return (
        CalEvent(
            summary=vevent.summary.value,
            description=vevent.description.value,
            dtstart=vevent.dtstart.value,
            dtend=vevent.dtend.value,
        )
        for event in calendar.date_search(
            start=datetime.now(),
            end=datetime.now() + timedelta(days=365),
            expand=True,
        )
        for vevent in event.vobject_instance.contents["vevent"]
    )