from fastapi import APIRouter, Depends, HTTPException, status
from sqlalchemy import select
from sqlalchemy.ext.asyncio import AsyncSession

from app.db.session import get_session
from app.models.car import Car
from app.schemas.car import CarCreate, CarRead, CarUpdate

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


@router.post("", response_model=CarRead, status_code=status.HTTP_201_CREATED)
async def create_car(payload: CarCreate, session: AsyncSession = Depends(get_session)) -> Car:
    car = Car(**payload.model_dump())
    session.add(car)
    await session.commit()
    await session.refresh(car)
    return car


@router.get("", response_model=list[CarRead])
async def list_cars(owner_id: int, session: AsyncSession = Depends(get_session)) -> list[Car]:
    result = await session.execute(
        select(Car).where(Car.owner_id == owner_id).order_by(Car.created_at.desc())
    )
    return list(result.scalars())


@router.get("/{car_id}", response_model=CarRead)
async def get_car(car_id: int, session: AsyncSession = Depends(get_session)) -> Car:
    car = await session.get(Car, car_id)
    if car is None:
        raise HTTPException(status_code=404, detail="Car not found")
    return car


@router.patch("/{car_id}", response_model=CarRead)
async def update_car(
    car_id: int, payload: CarUpdate, session: AsyncSession = Depends(get_session)
) -> Car:
    car = await session.get(Car, car_id)
    if car is None:
        raise HTTPException(status_code=404, detail="Car not found")
    for field, value in payload.model_dump(exclude_unset=True).items():
        setattr(car, field, value)
    await session.commit()
    await session.refresh(car)
    return car


@router.delete("/{car_id}", status_code=status.HTTP_204_NO_CONTENT)
async def delete_car(car_id: int, session: AsyncSession = Depends(get_session)) -> None:
    car = await session.get(Car, car_id)
    if car is None:
        raise HTTPException(status_code=404, detail="Car not found")
    await session.delete(car)
    await session.commit()