import logging
from datetime import datetime, timedelta
from jose import JWTError, jwt
from fastapi import HTTPException, status, Depends
from fastapi.security import OAuth2PasswordBearer

logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

SECRET_KEY = "a866319fb3f839e693191763019cf0dd3d78473d4d3d06d99afb3ef0b14bd0d5"
ALGORITHM = "HS256"
ACCESS_TOKEN_EXPIRE_MINUTES = 30

oauth2_scheme = OAuth2PasswordBearer(tokenUrl="/auth/token")

def create_access_token(data: dict):
    to_encode = data.copy()
    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

async def get_current_user(token: str = Depends(oauth2_scheme)):
    credentials_exception = HTTPException(
        status_code=status.HTTP_401_UNAUTHORIZED,
        detail="Could not validate credentials",
        headers={"WWW-Authenticate": "Bearer"},
    )
    logger.info(f"Attempting to validate token: {token[:20]}...")  # Log first 20 chars of token
    try:
        payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
        username: str = payload.get("sub")
        logger.info(f"Decoded payload: username={username}")
        if username is None:
            logger.error("No username in payload")
            raise credentials_exception
    except JWTError as e:
        logger.error(f"JWTError during token decoding: {str(e)}")
        raise credentials_exception
    print("\n\n\n")
    logger.info(f"Token validated for username: {username}")
    print("\n\n\n")
    return {"username": username}