from fastapi import APIRouter, Depends, HTTPException
from fastapi.security import OAuth2PasswordRequestForm
from sqlalchemy.orm import Session

from .. import models, schemas
from ..database import get_db
from ..security import hash_password, verify_password, create_access_token
from ..deps import get_current_user

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


@router.post("/register", response_model=schemas.UserOut)
def register(payload: schemas.UserCreate, db: Session = Depends(get_db)):
    existing = db.query(models.User).filter(models.User.email == payload.email).first()
    if existing:
        raise HTTPException(status_code=400, detail="Пользователь с таким email уже существует")

    # первый зарегистрированный пользователь становится администратором
    is_first_user = db.query(models.User).count() == 0
    user = models.User(
        email=payload.email,
        password_hash=hash_password(payload.password),
        role=models.Role.admin if is_first_user else models.Role.client,
    )
    db.add(user)
    db.commit()
    db.refresh(user)
    return user


@router.post("/login", response_model=schemas.Token)
def login(form_data: OAuth2PasswordRequestForm = Depends(), db: Session = Depends(get_db)):
    user = db.query(models.User).filter(models.User.email == form_data.username).first()
    if not user or not verify_password(form_data.password, user.password_hash):
        raise HTTPException(status_code=401, detail="Неверный email или пароль")
    token = create_access_token({"sub": str(user.id)})
    return {"access_token": token, "token_type": "bearer"}


@router.get("/me", response_model=schemas.UserOut)
def me(current_user: models.User = Depends(get_current_user)):
    return current_user