import jwt
import os
from datetime import datetime, timedelta, timezone
from dotenv import load_dotenv

load_dotenv()

SECRET = os.getenv("JWT_SECRET", "super_secret_key_change_me")
ALGORITHM = "HS256"
EXPIRY_HOURS = 72

def create_token(payload: dict) -> str:
    data = payload.copy()
    data["exp"] = datetime.now(timezone.utc) + timedelta(hours=EXPIRY_HOURS)
    return jwt.encode(data, SECRET, algorithm=ALGORITHM)

def verify_token(token: str):
    try:
        return jwt.decode(token, SECRET, algorithms=[ALGORITHM])
    except Exception:
        return None