from datetime import datetime, timedelta
from typing import Optional, Union
from jose import JWTError, jwt
from passlib.context import CryptContext
from app.config import settings

# Configuration du hachage de mots de passe
pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")


def verify_password(plain_password: str, hashed_password: str) -> bool:
    """Vérifier un mot de passe"""
    return pwd_context.verify(plain_password, hashed_password)


def get_password_hash(password: str) -> str:
    """Hasher un mot de passe"""
    return pwd_context.hash(password)


def create_access_token(data: dict, expires_delta: Optional[timedelta] = None) -> str:
    """Créer un token d'accès JWT"""
    to_encode = data.copy()
    if expires_delta:
        expire = datetime.utcnow() + expires_delta
    else:
        expire = datetime.utcnow() + timedelta(minutes=settings.access_token_expire_minutes)
    
    to_encode.update({"exp": expire})
    encoded_jwt = jwt.encode(to_encode, settings.secret_key, algorithm=settings.algorithm)
    return encoded_jwt


def create_refresh_token(data: dict) -> str:
    """Créer un token de rafraîchissement JWT"""
    to_encode = data.copy()
    expire = datetime.utcnow() + timedelta(days=settings.refresh_token_expire_days)
    to_encode.update({"exp": expire, "type": "refresh"})
    encoded_jwt = jwt.encode(to_encode, settings.secret_key, algorithm=settings.algorithm)
    return encoded_jwt


def verify_token(token: str) -> Optional[dict]:
    """Vérifier et décoder un token JWT"""
    try:
        payload = jwt.decode(token, settings.secret_key, algorithms=[settings.algorithm])
        return payload
    except JWTError:
        return None


def get_user_id_from_token(token: str) -> Optional[int]:
    """Extraire l'ID utilisateur d'un token"""
    payload = verify_token(token)
    if payload:
        return payload.get("user_id")
    return None