from datetime import datetime, timedelta
from typing import Optional
import os
from jose import JWTError, jwt
from schemas.user import UserRead

# Secret key and algorithm from environment variables
SECRET_KEY = os.getenv("SECRET_KEY", "your-super-secret-key-change-in-production")
ALGORITHM = os.getenv("ALGORITHM", "HS256")
ACCESS_TOKEN_EXPIRE_MINUTES = int(os.getenv("ACCESS_TOKEN_EXPIRE_MINUTES", "30"))

def create_access_token(data: dict, expires_delta: Optional[timedelta] = None):
    """
    Create a new access token with the provided data
    """
    to_encode = data.copy()
    if expires_delta:
        expire = datetime.utcnow() + expires_delta
    else:
        expire = datetime.utcnow() + timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES)
    
    to_encode.update({"exp": expire})
    encoded_jwt = jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
    return encoded_jwt

def verify_token(token: str) -> Optional[dict]:
    """
    Verify the provided token and return the payload if valid
    """
    try:
        payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
        return payload
    except JWTError:
        return None