from fastapi import APIRouter, Depends, HTTPException, status
from sqlalchemy import func
from sqlalchemy.orm import Session

from ..database import get_db
from ..deps import get_current_user, require_admin
from ..models import Location, User
from ..schemas import LocationCreate, LocationOut, LocationUpdate

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


@router.get("", response_model=list[LocationOut])
def list_locations(
    db: Session = Depends(get_db), _: User = Depends(get_current_user)
) -> list[Location]:
    return db.query(Location).order_by(Location.name).all()


@router.post("", response_model=LocationOut, status_code=status.HTTP_201_CREATED)
def create_location(
    payload: LocationCreate,
    db: Session = Depends(get_db),
    _: User = Depends(require_admin),
) -> Location:
    loc = Location(name=payload.name, parent_id=payload.parent_id)
    db.add(loc)
    db.commit()
    db.refresh(loc)
    return loc


@router.patch("/{location_id}", response_model=LocationOut)
def update_location(
    location_id: int,
    payload: LocationUpdate,
    db: Session = Depends(get_db),
    _: User = Depends(require_admin),
) -> Location:
    """Umbenennen. Chargen haengen an der ID, behalten ihren Lagerort also."""
    loc = db.get(Location, location_id)
    if loc is None:
        raise HTTPException(status.HTTP_404_NOT_FOUND, "Lagerort nicht gefunden")

    name = payload.name.strip()
    doppelt = (
        db.query(Location)
        .filter(func.lower(Location.name) == name.lower(), Location.id != location_id)
        .first()
    )
    if doppelt is not None:
        raise HTTPException(status.HTTP_409_CONFLICT, "Diesen Lagerort gibt es bereits")

    loc.name = name
    db.commit()
    db.refresh(loc)
    return loc


@router.delete("/{location_id}", status_code=status.HTTP_204_NO_CONTENT)
def delete_location(
    location_id: int,
    db: Session = Depends(get_db),
    _: User = Depends(require_admin),
) -> None:
    loc = db.get(Location, location_id)
    if loc is None:
        raise HTTPException(status.HTTP_404_NOT_FOUND, "Lagerort nicht gefunden")
    db.delete(loc)
    db.commit()