from passlib.context import CryptContext
from jose import jwt, JWTError
from datetime import datetime, timedelta
import os
from dotenv import load_dotenv

load_dotenv()

# Clave secreta y algoritmo
SECRET_KEY = os.getenv("SECRET_KEY")

ALGORITHM = "HS256"
ACCESS_TOKEN_EXPIRE_MINUTES = 60  # 1 hora

# Configurar encriptador
pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")

# Hashear contraseña
def hash_password(password: str) -> str:
    return pwd_context.hash(password)

# Verificar contraseña
def verify_password(plain: str, hashed: str) -> bool:
    return pwd_context.verify(plain, hashed)

# Crear token JWT
def create_access_token(data: dict, expires_delta: timedelta = None):
    to_encode = data.copy()
    expire = datetime.utcnow() + (expires_delta or timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES))
    to_encode.update({"exp": expire})
    if not SECRET_KEY:
        raise ValueError("SECRET_KEY no encontrada en el entorno")
    encoded_jwt = jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
    return encoded_jwt

# Verificar token JWT
def decode_access_token(token: str):
    try:
        if not SECRET_KEY:
            raise ValueError("SECRET_KEY no encontrada en el entorno")
        payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
        return payload
    except JWTError:
        return None