"""docs/tools/extract_api.py — 서버 주소 추출(PLAN 478-1 · FastAPI app.openapi()).

서버를 켜지 않고 `main.app` 을 불러 주소 목록을 얻고, TS 추출의 서버 주소 글자
(`raw/ts_api_calls.json`)와 경로 패턴으로 짝지어 씀:
  api.json           [{method, path, handler, callers[]}]
                     — 범위 파이썬이 받거나 범위 TS 가 부르는 주소
  api_unmatched.json {ts_calls: 짝 없는 TS 글자,
                      routes_without_caller: 범위 주소 중 부르는 TS 없음}
"""

from __future__ import annotations

import inspect
import json
import logging
import os
import re
import sys
from pathlib import Path

ROOT = Path(__file__).resolve().parents[2]
DATA = ROOT / "docs/_data"


def handler_id(endpoint) -> str | None:
    fn = inspect.unwrap(endpoint)
    try:
        file = Path(inspect.getsourcefile(fn)).resolve().relative_to(ROOT).as_posix()
    except (TypeError, ValueError):
        return None
    return f"py:{file}#{fn.__qualname__.replace('.<locals>.', '.')}"


def load_routes() -> list[dict]:
    os.chdir(ROOT)
    sys.path.insert(0, str(ROOT))
    logging.disable(logging.CRITICAL)
    from fastapi.routing import APIRoute

    import main

    endpoints = {
        (m, r.path): r.endpoint
        for r in main.app.routes
        if isinstance(r, APIRoute)
        for m in r.methods
    }
    out = []
    for path, ops in main.app.openapi()["paths"].items():
        for method in ops:
            m = method.upper()
            ep = endpoints.get((m, path))
            out.append({"method": m, "path": path, "handler": handler_id(ep) if ep else None})
    return out


def segments(path: str) -> list[str]:
    return [s for s in re.sub(r"^/api(?=/)", "", path).split("/") if s]


def score(ts_path: str, route_path: str) -> int | None:
    """맞으면 어긋남 수(작을수록 또렷) · 안 맞으면 None. TS `{}` = 아무 글자 · 서버 `{x}` = 칸."""
    a, b = segments(ts_path), segments(route_path)
    if len(a) != len(b):
        return None
    miss = 0
    for t, r in zip(a, b):
        param = r.startswith("{") and r.endswith("}")
        if "{}" in t:
            pat = "^" + ".*".join(re.escape(x) for x in t.split("{}")) + "$"
            if param:
                continue
            if not re.match(pat, r):
                return None
            miss += t == "{}"  # 통째 `{}` 가 글자 칸을 먹으면 어긋남 하나
        elif param:
            miss += 1  # 서버 칸이 TS 글자를 먹음
        elif t != r:
            return None
    return miss


def match(call: dict, routes: list[dict]) -> list[dict]:
    method = call["method"]  # 글자 · "*"(변수 · 펼침 = 아무 메서드) · None(모름 = GET 먼저)
    if method == "*":
        pool = routes
    elif method:
        pool = [r for r in routes if r["method"] == method]
    else:
        pool = [r for r in routes if r["method"] == "GET"]
    scored = [(s, r) for r in pool if (s := score(call["path"], r["path"])) is not None]
    if not scored and not method:
        scored = [(s, r) for r in routes if (s := score(call["path"], r["path"])) is not None]
    if not scored:
        return []
    best = min(s for s, _ in scored)
    return [r for s, r in scored if s == best]


def main() -> None:
    routes = load_routes()
    ts_calls = json.loads((DATA / "raw/ts_api_calls.json").read_text(encoding="utf-8"))
    py_ids = {
        f["id"] for f in json.loads((DATA / "raw/functions_py.json").read_text(encoding="utf-8"))
    }
    callers: dict[tuple[str, str], set[str]] = {}
    unmatched = []
    for call in ts_calls:
        hits = match(call, routes)
        if not hits:
            unmatched.append(call)
        for r in hits:
            callers.setdefault((r["method"], r["path"]), set()).add(call["fn"])
    api = [
        {**r, "callers": sorted(callers.get((r["method"], r["path"]), ()))}
        for r in routes
        if r["handler"] in py_ids or (r["method"], r["path"]) in callers
    ]
    api.sort(key=lambda r: (r["path"], r["method"]))
    lonely = [f"{r['method']} {r['path']}" for r in api if not r["callers"]]
    (DATA / "api.json").write_text(
        json.dumps(api, ensure_ascii=False, indent=1) + "\n", encoding="utf-8"
    )
    (DATA / "api_unmatched.json").write_text(
        json.dumps(
            {"ts_calls": unmatched, "routes_without_caller": lonely}, ensure_ascii=False, indent=1
        )
        + "\n",
        encoding="utf-8",
    )
    print(
        f"api: 서버 주소 전체 {len(routes)} · 범위 {len(api)} · 짝 없는 TS 글자 {len(unmatched)} · "
        f"부르는 TS 없는 주소 {len(lonely)}"
    )


if __name__ == "__main__":
    main()