"""DrugCentral async wrapper (https://drugcentral.org/api).
   Provides drug metadata, approvals, MoA, off‑label, etc.
"""

import httpx, asyncio
from functools import lru_cache

_BASE = "https://drugcentral.org/api/v1/drug"

@lru_cache(maxsize=256)
async def fetch_drugcentral(drug_name: str) -> dict | None:
    async with httpx.AsyncClient(timeout=10) as client:
        resp = await client.get(_BASE, params={"name": drug_name})
        if resp.status_code == 404:
            return None
        resp.raise_for_status()
        return resp.json()