from fastapi import Depends, HTTPException, status
from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
from sqlalchemy.orm import Session
from app.database import get_db
from app.core.security import verify_token, get_user_id_from_token
from app.models.user import User
from app.schemas.user import TokenData

security = HTTPBearer()


def get_current_user(
    credentials: HTTPAuthorizationCredentials = Depends(security),
    db: Session = Depends(get_db)
) -> User:
    """Obtenir l'utilisateur actuel à partir du token JWT"""
    credentials_exception = HTTPException(
        status_code=status.HTTP_401_UNAUTHORIZED,
        detail="Impossible de valider les identifiants",
        headers={"WWW-Authenticate": "Bearer"},
    )
    
    token = credentials.credentials
    payload = verify_token(token)
    if payload is None:
        raise credentials_exception
    
    user_id: int = payload.get("user_id")
    if user_id is None:
        raise credentials_exception
    
    user = db.query(User).filter(User.id == user_id).first()
    if user is None:
        raise credentials_exception
    
    return user


def get_current_active_user(current_user: User = Depends(get_current_user)) -> User:
    """Obtenir l'utilisateur actuel actif"""
    if not current_user.is_active:
        raise HTTPException(status_code=400, detail="Utilisateur inactif")
    return current_user


def get_current_admin_user(current_user: User = Depends(get_current_user)) -> User:
    """Obtenir l'utilisateur administrateur actuel"""
    if not current_user.is_admin:
        raise HTTPException(
            status_code=status.HTTP_403_FORBIDDEN,
            detail="Permissions insuffisantes"
        )
    return current_user


def get_optional_user(
    credentials: HTTPAuthorizationCredentials = Depends(security),
    db: Session = Depends(get_db)
) -> User:
    """Obtenir l'utilisateur optionnel (pour les endpoints publics)"""
    try:
        token = credentials.credentials
        payload = verify_token(token)
        if payload is None:
            return None
        
        user_id: int = payload.get("user_id")
        if user_id is None:
            return None
        
        user = db.query(User).filter(User.id == user_id).first()
        return user
    except:
        return None