from datetime import datetime

from fastapi import APIRouter, Depends, HTTPException, status
from fastapi.responses import StreamingResponse
from PIL import Image

from ..core.calendar_config import CalendarConfig, DoorsSaved, get_calendar_config
from ..core.depends import get_all_event_days, get_day_image
from ..core.helpers import EventDays, api_return_image, load_image
from ._security import user_can_view_day, user_is_admin

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


@router.get(
    "/background_image",
    response_class=StreamingResponse,
)
async def get_background_image(
    cal_cfg: CalendarConfig = Depends(get_calendar_config),
) -> StreamingResponse:
    """
    Hintergrundbild laden
    """

    return await api_return_image(await load_image(f"files/{cal_cfg.background}"))


@router.get(
    "/image_{day}",
    response_class=StreamingResponse,
)
async def get_image_for_day(
    image: Image.Image = Depends(get_day_image),
    can_view: bool = Depends(user_can_view_day),
    is_admin: bool = Depends(user_is_admin),
) -> StreamingResponse:
    """
    Bild für einen Tag erstellen
    """

    if not (can_view or is_admin):
        raise HTTPException(status.HTTP_401_UNAUTHORIZED, "Wie unhöflich!!!")

    return await api_return_image(image)


@router.get("/doors")
async def get_doors(
    cal_cfg: CalendarConfig = Depends(get_calendar_config),
) -> DoorsSaved:
    """
    User-sichtbare Türchen lesen
    """

    return [door for door in cal_cfg.doors if await user_can_view_day(door.day)]


@router.get("/next_door")
async def get_next_door(
    event_days: EventDays = Depends(get_all_event_days),
) -> int | None:
    """
    Zeit in ms, bis das nächste Türchen öffnet
    """

    if event_days.next is None:
        return None

    dt = datetime.combine(event_days.next, datetime.min.time())
    td = dt - datetime.now()

    return int(td.total_seconds() * 1000)