from datetime import datetime, timedelta
from typing import Optional
import jwt
from mooc.core.config import settings

def create_access_token(
    subject: str, expires_delta: Optional[timedelta] = None
) -> str:
    """
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    """
    if expires_delta:
        expire = datetime.now(datetime.timezone.utc) + expires_delta
    else:
        expire = datetime.now(datetime.timezone.utc) + timedelta(
            minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES
        )
    
    to_encode = {"exp": expire, "sub": str(subject)}
    encoded_jwt = jwt.encode(
        to_encode, 
        settings.SECRET_KEY, 
        algorithm=settings.ALGORITHM
    )
    return encoded_jwt