#!/usr/bin/env python3
"""标题搜索兜底：对 arXiv-DOI 未命中的论文，用 OpenAlex 标题搜索找回 topics。

- 老论文优先（OpenAlex 更可能已收录，配额效率高）。
- 标题验证 Jaccard>=0.7 才算命中，避免误配。
- 命中并入 openalex_topics_map.json 的 matched；每个 id 记入 title_tried（至多搜一次）。
- 按当日剩余配额设预算；跑完用 enrich_topics.py --merge-only 重新合并。
可多日续跑：每天额度重置后再跑一次即可。
"""
import json
import os
import re
import sys
import time
import threading
import urllib.error
import urllib.parse
import urllib.request
from concurrent.futures import ThreadPoolExecutor, as_completed

SRC = "arxiv_cs_2022_2026.topics.jsonl"
MAP = "openalex_topics_map.json"
MAILTO = "elfsong@outlook.sg"
WORKERS = 6
SIM_TH = 0.7
BUDGET_BUFFER = 300        # 给配额留点缓冲，别打到硬 429
_lock = threading.Lock()


def norm(s):
    return re.sub(r"[^a-z0-9]+", " ", (s or "").lower()).strip()


def jacc(a, b):
    sa, sb = set(norm(a).split()), set(norm(b).split())
    return len(sa & sb) / len(sa | sb) if sa | sb else 0.0


def quota_remaining():
    url = ("https://api.openalex.org/works?filter=doi:10.48550/arxiv.2310.06825"
           f"&select=id&mailto={MAILTO}")
    req = urllib.request.Request(url, headers={"User-Agent": MAILTO})
    with urllib.request.urlopen(req, timeout=30) as r:
        return int(r.headers.get("x-ratelimit-remaining", "0"))


def load_map():
    d = json.load(open(MAP)) if os.path.exists(MAP) else {}
    return d.get("matched", {}), set(d.get("title_tried", []))


def save_map(matched, tried):
    tmp = MAP + ".tmp"
    json.dump({"matched": matched, "title_tried": sorted(tried)}, open(tmp, "w"))
    os.replace(tmp, MAP)


def search_one(aid, title):
    """返回 ('hit', topic_obj) / ('nohit', None) / ('quota', None)。"""
    q = urllib.parse.urlencode({
        "filter": "title.search:" + title,
        "select": "id,title,primary_topic,topics", "per-page": 1, "mailto": MAILTO})
    url = "https://api.openalex.org/works?" + q
    for attempt in range(4):
        try:
            req = urllib.request.Request(url, headers={"User-Agent": MAILTO})
            res = json.load(urllib.request.urlopen(req, timeout=40)).get("results", [])
            if res and jacc(title, res[0].get("title")) >= SIM_TH:
                w = res[0]
                return "hit", {
                    "primary": (w.get("primary_topic") or {}).get("display_name"),
                    "topics": [t["display_name"] for t in (w.get("topics") or [])],
                }
            return "nohit", None
        except urllib.error.HTTPError as e:
            if e.code == 429:
                return "quota", None
            time.sleep(3 * (attempt + 1))
        except Exception:
            time.sleep(3 * (attempt + 1))
    return "nohit", None


def main():
    matched, tried = load_map()
    rows = [json.loads(l) for l in open(SRC)]
    targets = [(d["year"], d["id"], d["title"]) for d in rows
               if d.get("openalex_primary_topic") is None and d["id"] not in tried]
    targets.sort(key=lambda x: (x[0], x[1]))          # 老论文优先
    rem = quota_remaining()
    budget = max(0, rem - BUDGET_BUFFER)
    todo = targets[:budget]
    print(f"unmatched&untried={len(targets)} | quota_remaining={rem} | "
          f"budget={budget} | running={len(todo)}", flush=True)
    if not todo:
        return

    done = hits = 0
    stop = threading.Event()
    with ThreadPoolExecutor(max_workers=WORKERS) as ex:
        futs = {ex.submit(search_one, aid, title): aid for _, aid, title in todo}
        for fut in as_completed(futs):
            aid = futs[fut]
            status, obj = fut.result()
            with _lock:
                if status == "quota":
                    stop.set()
                else:
                    tried.add(aid)
                    if status == "hit":
                        matched[aid] = obj
                        hits += 1
                done += 1
                if done % 100 == 0:
                    save_map(matched, tried)
                    print(f"  {done}/{len(todo)} | new_hits={hits} "
                          f"matched_total={len(matched)}", flush=True)
            if stop.is_set():
                break
    save_map(matched, tried)
    print(f"FALLBACK DONE searched={done} new_hits={hits} "
          f"matched_total={len(matched)} quota_hit={stop.is_set()}", flush=True)


if __name__ == "__main__":
    main()