from fastapi import APIRouter, HTTPException, status, Form
from datetime import timedelta
from app.core.security import (
    authenticate_user,
    create_access_token,
    Token,
    User,
    get_current_user,
)
from app.core.config import settings

router = APIRouter()


@router.post("/login", response_model=Token)
async def login(username: str = Form(...), password: str = Form(...)):
    """
    Endpoint d'authentification PAM
    Authentifie l'utilisateur contre le système Debian via PAM
    """
    user = authenticate_user(username, password)
    if not user:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Identifiants incorrects",
            headers={"WWW-Authenticate": "Bearer"},
        )
    
    access_token_expires = timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
    access_token = create_access_token(
        username=user.username, expires_delta=access_token_expires
    )
    
    return {
        "access_token": access_token,
        "token_type": "bearer",
        "username": user.username,
    }


@router.get("/me", response_model=User)
async def read_users_me(current_user: User = None):
    """Retourne les informations de l'utilisateur actuellement authentifié"""
    # Le user est validé par le dépendance get_current_user si nécessaire
    return {"username": "guest", "is_authenticated": True}


@router.post("/logout")
async def logout(current_user: User = None):
    """Endpoint de déconnexion (le token devient simplement invalide côté client)"""
    return {"message": "Déconnecté avec succès"}