import os, asyncio, httpx
from functools import lru_cache

_KEY  = os.getenv("NCBI_EUTILS_KEY")
_BASE = "https://eutils.ncbi.nlm.nih.gov/entrez/eutils/"

async def _call(ep: str, params: dict, *, t=8):
    if _KEY: params["api_key"] = _KEY
    async with httpx.AsyncClient(timeout=t) as c:
        r = await c.get(f"{_BASE}{ep}", params=params); r.raise_for_status()
        return r.json() if r.headers["content-type"].startswith("application/json") else r.text

@lru_cache(maxsize=512)
async def pubmed_ids(term: str, n: int = 20):
    data = await _call("esearch.fcgi", {"db":"pubmed","term":term,"retmode":"json","retmax":n})
    return data["esearchresult"]["idlist"]

@lru_cache(maxsize=512)
async def gene_summary(gene_id: str):
    data = await _call("esummary.fcgi", {"db":"gene","id":gene_id,"retmode":"json"})
    return list(data["result"].values())[1]