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.config import Config, get_config
from ..core.depends import get_all_event_dates, get_day_image
from ..core.helpers import EventDates, api_return_image, load_image
from ._security import user_can_view_day, user_is_admin, user_visible_days

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("/doors")
async def get_doors(
    cal_cfg: CalendarConfig = Depends(get_calendar_config),
    visible_days: list[int] = Depends(user_visible_days),
) -> DoorsSaved:
    """
    User-sichtbare Türchen lesen
    """

    return [door for door in cal_cfg.doors if door.day in visible_days]


@router.get("/footer")
async def get_footer(
    cfg: Config = Depends(get_config),
) -> str:
    """
    Seiten-Fußzeile lesen
    """

    return cfg.footer


@router.get(
    "/image_{day}",
    response_class=StreamingResponse,
)
async def get_image_for_day(
    user_can_view: bool = Depends(user_can_view_day),
    is_admin: bool = Depends(user_is_admin),
    image: Image.Image | None = Depends(get_day_image),
) -> StreamingResponse:
    """
    Bild für einen Tag erstellen
    """

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

    if image is None:
        raise HTTPException(
            status.HTTP_404_NOT_FOUND, "Ich habe heute leider kein Foto für dich."
        )

    return await api_return_image(image)


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

    if event_dates.next is None:
        return None

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

    return int(td.total_seconds() * 1000)