import os 
import time
import httpx
from core.conf import settings

_token_cache = {
    "access_token": None,
    "expires_at": 0,
}
API_BASE_URL_ACCESS_TOKEN = settings.API_BASE_URL_ACCESS_TOKEN

async def get_access_token() -> str:
    current_time = int(time.time())
    if _token_cache["access_token"] is None or  current_time >= _token_cache["expires_at"]:
        await refresh_access_token()
    return _token_cache["access_token"]

async def refresh_access_token():
    async with httpx.AsyncClient() as client:
        response = await client.get(url=API_BASE_URL_ACCESS_TOKEN)
        response.raise_for_status()
        data = response.json()
        access_token = data.get("data")
        expires_in = 3600  

        _token_cache["access_token"] = access_token
        _token_cache["expires_at"] = int(time.time()) + expires_in - 60