@auth_router.get("/login/google")
async def login_google(request: Request):
    redirect_uri = FASTAPI_BACKEND_URL + "/auth/"
    return await oauth.google.authorize_redirect(
        request, 
        redirect_uri,
        code_challenge_method="S256"
    )

@auth_router.get("/login/google")
async def login_google(request: Request):
    redirect_uri = FASTAPI_BACKEND_URL + "/auth/"
    code_verifier = generate_token(48)
    request.session["code_verifier"] = code_verifier
    return await oauth.google.authorize_redirect(
        request, 
        redirect_uri,
        code_challenge_method="S256",
        code_verifier=code_verifier
    )

@auth_router.get("/auth")
async def auth_google_callback(request: Request, db: AsyncDB):
    logger.info(request.session)
    # await google access token
    try:

        code_verifier = request.session.get("code_verifier")
        if not code_verifier:
            logger.error("Code verifier not found in session")
            return RedirectResponse(url=f'{NEXTJS_FRONTEND_URL}/login?error=missing_verifier')

        token = await oauth.google.authorize_access_token(request)
    except OAuthError as e:
        logger.error(f"OAuth error during callback: {str(e)}")
        return RedirectResponse(url=f'{NEXTJS_FRONTEND_URL}/login?error={str(e)}')