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

# Importations ABSOLUES
from core.database import get_db 
from core.security import verify_password, create_access_token
from crud import user as crud_user # Était déjà correcte pour "crud", mais assure la cohérence
from schemas import user as schemas_user
from core.config import settings
from core.hashing import verify_password

router = APIRouter(
    prefix="/auth",
    tags=["Authentication"],
    responses={404: {"description": "Not found"}},
)

ACCESS_TOKEN_EXPIRE_MINUTES = settings.ACCESS_TOKEN_EXPIRE_MINUTES 

@router.post("/register", response_model=schemas_user.UserResponse, status_code=status.HTTP_201_CREATED)
def register_user(user: schemas_user.UserCreate, db: Session = Depends(get_db)):
    db_user = crud_user.get_user_by_email(db, email=user.email)
    if db_user:
        raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail="Email déjà enregistré.")
    
    new_user = crud_user.create_user(db=db, user=user)
    return new_user

@router.post("/login", response_model=dict)
def login_for_access_token(form_data: OAuth2PasswordRequestForm = Depends(), db: Session = Depends(get_db)):
    user = crud_user.get_user_by_email(db, email=form_data.username) 
    if not user or not verify_password(form_data.password, user.hashed_password):
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Identifiants incorrects",
            headers={"WWW-Authenticate": "Bearer"},
        )
    
    access_token_expires = timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES)
    access_token = create_access_token(
        data={"sub": user.email}, expires_delta=access_token_expires
    )
    return {"access_token": access_token, "token_type": "bearer"}