from passlib.context import CryptContext
import os
from datetime import datetime, timedelta
from typing import Union, Any
from jose import jwt

ACCESS_TOKEN_EXPIRE_MINUTES = 30  # 30 minutes
REFRESH_TOKEN_EXPIRE_MINUTES = 60 * 24 * 7 # 7 days
ALGORITHM = "HS256"
# JWT_SECRET_KEY = os.environ['JWT_SECRET_KEY']     # should be kept secret
# JWT_REFRESH_SECRET_KEY = os.environ['JWT_REFRESH_SECRET_KEY']      # should be kept secret
JWT_SECRET_KEY = "QUICKGPT"
JWT_REFRESH_SECRET_KEY = "QUICKGPT_REFRESH"

pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")

def verify_password(plain_password: str, hashed_password: str) -> bool:
    return pwd_context.verify(plain_password, hashed_password)


def get_password_hash(password: str) -> str:
    return pwd_context.hash(password)


def create_access_token(subject: Union[str, Any], expires_delta: int = None) -> str:
    if expires_delta is not None:
        expires_delta = datetime.utcnow() + expires_delta
    else:
        expires_delta = datetime.utcnow() + timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES)
    
    to_encode = {"exp": expires_delta, **subject}
    encoded_jwt = jwt.encode(to_encode, JWT_SECRET_KEY, ALGORITHM)
    return encoded_jwt


def create_refresh_token(subject: Union[str, Any], expires_delta: int = None) -> str:
    if expires_delta is not None:
        expires_delta = datetime.utcnow() + expires_delta
    else:
        expires_delta = datetime.utcnow() + timedelta(minutes=REFRESH_TOKEN_EXPIRE_MINUTES)
    
    to_encode = {"exp": expires_delta, **subject}
    encoded_jwt = jwt.encode(to_encode, JWT_REFRESH_SECRET_KEY, ALGORITHM)
    return encoded_jwt