from datetime import datetime, timedelta
from typing import Optional
import bcrypt
from jose import JWTError, jwt
from ..config import get_settings


def hash_password(password: str) -> str:
    return bcrypt.hashpw(password.encode(), bcrypt.gensalt()).decode()


def verify_password(plain: str, hashed: str) -> bool:
    return bcrypt.checkpw(plain.encode(), hashed.encode())


def create_token(user_id: str) -> str:
    settings = get_settings()
    expire = datetime.utcnow() + timedelta(days=settings.jwt_expire_days)
    payload = {"sub": user_id, "exp": expire, "iat": datetime.utcnow()}
    return jwt.encode(payload, settings.jwt_secret, algorithm=settings.jwt_algorithm)


def decode_token(token: str) -> Optional[str]:
    settings = get_settings()
    try:
        payload = jwt.decode(token, settings.jwt_secret, algorithms=[settings.jwt_algorithm])
        return payload.get("sub")
    except JWTError:
        return None