from datetime import datetime, timedelta, timezone

from jose import JWTError, jwt

from app.config import get_settings


def create_access_token(subject: str, expires_minutes: int | None = None) -> str:
    settings = get_settings()
    expire = datetime.now(timezone.utc) + timedelta(minutes=expires_minutes or settings.jwt_expire_minutes)
    payload = {"sub": subject, "exp": expire}
    return jwt.encode(payload, settings.jwt_secret_key, algorithm=settings.jwt_algorithm)


def decode_access_token(token: str) -> str | None:
    settings = get_settings()
    try:
        payload = jwt.decode(token, settings.jwt_secret_key, algorithms=[settings.jwt_algorithm])
    except JWTError:
        return None
    subject = payload.get("sub")
    return str(subject) if subject is not None else None