"""Eat This Much 离线克隆 —— FastAPI 组合根。

布局与判据：

* ``frontend/pages`` 是每条范围内路由的本地化存档文档，``static/`` 是冻结的
  静态资源。运行时不可达任何远端来源（CSP 把 connect/img/frame/script 全锁在本源）。
* 源站的 www 与 /app 都是 SvelteKit。www 走服务端渲染，正文在 HTML 里，可以直接
  存档；``/app`` 是纯客户端渲染，页面外壳没有内容，全靠 ``/api/v1/*`` ——所以
  ``/app`` 这一面必须把接口实现出来，让源站自己的 bundle 在本地跑起来。
* SvelteKit 按页面深度写相对资源前缀（``./_app/…``、``../../_app/…``）。克隆不改这些
  标记，改的是路由：任意深度的 ``**/_app/immutable/**`` 都落到同一份冻结资源上。
* ``/calories/<slug>-<id>``：数字是权威的，slug 是装饰性的。换个 slug 源站 301 回
  规范地址，克隆照做——不比源站更严格，也不更宽松。
* ``/app`` 对未匹配路径答 **200 + 404 文案外壳**（源站如此）。克隆答真 404 会比
  源站更严格，那是错的。
* 站外链接落到 ``/external/{host}`` 边界页，答 200：链接确实通向了某处，只是那个
  某处在离线包里。
* 账号、邮件、支付全部走引擎自带的 ``websitebench.local_clone_auth`` 与
  ``websitebench.site_backend``：口令 scrypt 存哈希、会话只存摘要、找回密码对
  已知/未知邮箱给不可区分的公开响应、邮件默认 LOCAL_ONLY、支付只有本地沙箱。
* ``GET /healthz`` 恒返回 ``{"ok":true,"site_id":"eatthismuch"}``。
"""

from __future__ import annotations

import html
import json
import threading
import os
import pathlib
import re
import sys
from typing import Any
from urllib.parse import parse_qsl, quote, unquote, urlencode

from fastapi import FastAPI, Request
from fastapi.responses import (
    FileResponse,
    HTMLResponse,
    JSONResponse,
    PlainTextResponse,
    RedirectResponse,
    Response,
)

ROOT = pathlib.Path(__file__).resolve().parent
if str(ROOT) not in sys.path:
    sys.path.insert(0, str(ROOT))

import sitepack  # noqa: E402
from backend import content_store as store  # noqa: E402
from backend import app_api
from backend import macro_calculator  # noqa: E402
from backend import g_api  # noqa: E402
from backend.site_services import (  # noqa: E402
    data_dir,
    DEMO_DISPLAY_NAME,
    DEMO_EMAIL,
    open_services,
)
# 注册/找回密码要按引擎抛的异常分流：校验不过是字段错，其余归 __all__。
from websitebench.local_clone_auth import (  # noqa: E402
    AuthError,
    RESET_PUBLIC_MESSAGE,
)

SITE_ID = "eatthismuch"
STATIC = ROOT / "static"
# The frozen binary assets and the archived inline-API bodies are read out of
# ``clone/_sitepack`` when compile.sh has packed them and straight off disk when
# it has not; see sitepack.py for why the compiled tree may not carry fifteen
# thousand files.
STATIC_PACK = sitepack.SitePack.load(ROOT / "_sitepack" / "static.packindex.json")
INLINE_PACK = sitepack.SitePack.load(ROOT / "_sitepack" / "inline-api.packindex.json")
PAGES = ROOT / "frontend" / "pages"
AUTH_PAGES = ROOT / "frontend" / "auth"


def _load_static_map(name: str) -> dict[str, str]:
    """构建期从抓取日志带过来的静态资产索引。"""
    src = ROOT / "backend" / "content" / name
    if not src.is_file():
        return {}
    try:
        data = json.loads(src.read_text(encoding="utf-8"))
    except Exception:
        return {}
    return {str(k): str(v) for k, v in data.items()} if isinstance(data, dict) else {}


# 路径 → 实测 content-type
STATIC_TYPES: dict[str, str] = _load_static_map("static-types.json")
# "裸路径?归一化查询串" → 实际落盘的那个带哈希的路径
STATIC_QUERIES: dict[str, str] = _load_static_map("static-queries.json")


# ---- 内联接口回放 ---------------------------------------------------------
#
# 源站把 load() 里 fetch 到的响应内联在页面里（`<script data-sveltekit-fetched>`），
# 首屏水合直接读它。那批内联块是**服务端真正发出的响应体**，构建时被收进
# backend/content/inline-api/（见 tools/build_clone.py:build_inline_api）。
# 客户端路由跳转时没有内联块可读，会真的发请求——这里就用实测到的响应回答，
# 不是照消费方代码"还原形状"编出来的。

def _load_inline_api() -> dict:
    src = ROOT / "backend" / "content" / "inline-api-index.json"
    if not src.is_file():
        return {"pool": {}, "meta": {}}
    try:
        data = json.loads(src.read_text(encoding="utf-8"))
    except Exception:
        return {"pool": {}, "meta": {}}
    if not isinstance(data, dict):
        return {"pool": {}, "meta": {}}
    return {"pool": data.get("pool") or {}, "meta": data.get("meta") or {}}


INLINE_API = _load_inline_api()
INLINE_DIR = ROOT / "backend" / "content" / "inline-api"
# 同一个键有多份实测响应时（生成接口每次的餐单都不一样）轮换着答，
# 与源站"每次调用结果不同"这一点对齐。计数器只用来选一份已有的观测，
# 不参与任何内容生成。
_INLINE_TURN: dict[str, int] = {}
_INLINE_LOCK = threading.Lock()

# 客户端每次请求都带的版本号，与响应内容无关，做键时去掉
_BACKEND_VERSION = "HTTP_BACKEND_VERSION"


def _inline_key(path: str, query: str) -> str:
    kept = [
        (k, v)
        for k, v in parse_qsl(query, keep_blank_values=True)
        if k != _BACKEND_VERSION
    ]
    kept.sort()
    q = urlencode(kept)
    return f"{path}?{q}" if q else path


def inline_replay(path: str, query: str = "") -> Response | None:
    """有实测响应就回放，没有就返回 None 让调用方走原来的分支。

    ★ 回放要补盖 ``Api-Response-Version``。

    回放响应带的是**取证当时记下来的那些头**。两批取证记的详略不同：
    浏览器那批（captures/*/raw）记了全套响应头，857 条里带着这个头；
    ``recon/api-fetched/`` 那批是直接 GET 下来的，meta 只记了
    ``{"url","status","headers":{"content-type"},"bytes"}`` —— 265 条一律没有。

    没有这个头，源站自己的取数封装（chunks/gotDHXHr.js）走 default 分支，把整个
    信封当 payload 交出去。消费方是**解包后**的写法：

        a = await Ce(e, `/api/v1/food/${r}/`)      // nodes/36.3cnGAiU-.js
        o.pathname = a.canonical_url ?? a.public_url
        if (!a.weights[s.units]) throw be(307, a.public_url)

    ``a`` 变成信封之后 ``a.weights`` 是 undefined，下一步取下标直接 TypeError。

    实测（run/tmp/probe_spa_nav2.py，SPA 内导航而不是直接 goto——直接 goto 走的是
    服务端预渲染那份 HTML，看不见这个洞）：点进 /calories/banana-oatmeal-33511，
    响应 200 但 ``ver=-``，页面渲染成 **「500 Error / An error has occurred.」**。
    换成 captures 批次里的 id（4698529，带头）同一条路径完全正常。

    所以：捕获时没记到头、而响应体又是信封形状的，按信封补盖。裸对象
    （tastypie 的老接口、``{}``）一个都不补——给它们戴上头，解析器会走进
    case 分支去读 ``t.success``，反而把好端端的接口打坏。
    """

    key = _inline_key(path, query)
    digests = INLINE_API["pool"].get(key)
    if not digests:
        return None
    if len(digests) == 1:
        digest = digests[0]
    else:
        with _INLINE_LOCK:
            n = _INLINE_TURN.get(key, 0)
            _INLINE_TURN[key] = n + 1
        digest = digests[n % len(digests)]
    name = f"{digest}.json"
    # 打包过的存档响应从 blob 里按同名读；没打包就还是读盘。见 sitepack.py。
    body = sitepack.packed_bytes(INLINE_PACK, name)
    if body is None:
        body_file = INLINE_DIR / name
        if not body_file.is_file():
            return None
        body = body_file.read_bytes()
    info = INLINE_API["meta"].get(digest) or {}
    headers = {
        str(k): str(v)
        for k, v in (info.get("headers") or {}).items()
        if str(k).lower() not in ("content-length", "content-encoding", "transfer-encoding")
    }
    if not any(k.lower() == "api-response-version" for k in headers):
        try:
            payload = json.loads(body)
        except ValueError:
            payload = None
        if isinstance(payload, dict) and _ENVELOPE_SIGNATURE <= payload.keys():
            headers["Api-Response-Version"] = API_RESPONSE_VERSION
    return Response(
        content=body,
        status_code=int(info.get("status") or 200),
        media_type="application/json",
        headers=headers or None,
    )
_HEALTH = json.dumps({"ok": True, "site_id": SITE_ID}, separators=(",", ":"))

# 源站页面自带 SvelteKit 的水合脚本与内联 style，要放行；但 connect/img/frame
# 一律限死本源，任何漏网的远端请求都会被 CSP 拦下来变成可见的失败。
CSP = (
    "default-src 'self'; img-src 'self' data: blob:; "
    "style-src 'self' 'unsafe-inline'; "
    "script-src 'self' 'unsafe-inline' 'unsafe-eval'; "
    "font-src 'self' data:; connect-src 'self'; frame-src 'self'; "
    "media-src 'self' data: blob:; worker-src 'self' blob:; "
    "form-action 'self'; base-uri 'self'; object-src 'none'"
)

app = FastAPI(title="Eat This Much offline clone", docs_url=None, redoc_url=None)

BACKEND, AUTH, AUTH_MAILER = open_services()
COOKIE = BACKEND.session_cookie
COOKIE_NAME = COOKIE["name"]

# /app 的账号状态写在可写数据目录下——clone/ 是只读挂载。
STATE = app_api.AppState(data_dir() / "app-state.json")


# ------------------------------------------------------------------ 基础设施

@app.middleware("http")
async def offline_headers(request: Request, call_next):
    response = await call_next(request)
    response.headers["Content-Security-Policy"] = CSP
    response.headers["Referrer-Policy"] = "no-referrer"
    response.headers["X-Content-Type-Options"] = "nosniff"
    response.headers.setdefault("Cache-Control", "no-store")
    return response


# ★ 客户端用**响应头**挑解析分支，不是用 URL。
# chunks/gotDHXHr.js 里的响应解析器（源站自己的代码，抓回来的）：
#     switch(e.headers.get(`Api-Response-Version`)){
#       case`2023-05-10`: let t=await e.json();
#                         if(!t.success) throw new L(t.errors);
#                         return t.data
#       default:          return e.json()          ← 信封原样返回
#     }
# 没有这个头，整个信封会被当成 payload 交给调用方。登录页读的是
# `e.data.user`（nodes/21.eBjk7AG0.js），于是拿到 undefined 再取 .id ——
# 实测现象就是三种输入（密码错 / 账号不存在 / 正确）都渲染
# 「An unknown error has occurred. Please reload the page.」，
# 控制台一条 `Cannot read properties of undefined (reading 'id')`。
# 失败信封也一样浮不上来：只有走进 case 分支才会 throw L，
# `success:false` 本身不触发任何东西。
# 源站的登录页跑得起来（recon 里 POST /api/login/ 之后就跳 /app/planner），
# 所以源站的信封响应必然带着这个头——这条是从抓回来的第一方代码推出来的，
# 不是实测到的响应头（recon 只记了 url/method/status/ct，没记全部响应头）。
API_RESPONSE_VERSION = "2023-05-10"
# 认信封只看这两个键。源站自己就有只发四个键的响应（/api/get-stripe-currency-locale/
# 与 41 条 /api/similar-foods/*，实测响应体里根本没有 errors），拿五个键当门槛会把
# 它们判成裸对象。裸对象没有 success，照样进不来。
_ENVELOPE_SIGNATURE = frozenset({"data", "success"})


def stamp_version(response: Response, payload: Any) -> Response:
    """信封形状的响应才带版本头。

    裸 JSON 不能带：``/api/clone/telemetry`` 答的是 ``{}``、tastypie 那批老接口
    答的是对象本身。给它们戴上头，解析器会走进 case 分支去读 ``t.success``，
    读不到就 ``throw new L(undefined)``，反而把好端端的接口打坏。
    """

    if isinstance(payload, dict) and _ENVELOPE_SIGNATURE <= payload.keys():
        response.headers["Api-Response-Version"] = API_RESPONSE_VERSION
    return response


def envelope(
    data: Any = None,
    *,
    success: bool = True,
    errors: Any = None,
    warnings: dict[str, Any] | None = None,
    meta: dict[str, Any] | None = None,
    status: int = 200,
) -> JSONResponse:
    """源站 ``/api/v1/*`` 的响应外壳形状，照它的样子答。"""

    payload = {
        "data": data,
        "errors": errors,
        "meta": meta if meta is not None else {},
        "success": success,
        "warnings": warnings if warnings is not None else {},
    }
    return stamp_version(JSONResponse(payload, status_code=status), payload)


def session_token(request: Request) -> str | None:
    return request.cookies.get(COOKIE_NAME)


def current_account(request: Request) -> dict[str, Any] | None:
    """会话 → 账号；匿名答 None。

    ★ 引擎的 ``resolve_session`` 答的是
    ``{'authenticated': True, 'account': {'account_id': …, 'email_normalized': …}, …}``
    ——账号信息在 ``account`` 这一层里面，**顶层没有 account_id**。
    之前这里按顶层的 ``account_id`` 判定，取到的永远是 None，于是登录成功之后
    每一条 ``/api/v1/*`` 依旧答 401；SPA 的请求层拿到 401 就直接
    ``location.href = /app/login?next=…``（gotDHXHr.js 的 cg，case 401 分支），
    现象是「登录像是没生效」，而登录接口本身其实是成功的。
    """

    record = AUTH.resolve_session(session_token(request))
    if not record or not record.get("authenticated"):
        return None
    account = record.get("account")
    if not account:
        return None
    return public_account(account)


def public_account(account: dict[str, Any]) -> dict[str, Any]:
    """引擎给的账号字段名是 email_normalized，页面层要的是 email。"""

    account = dict(account)
    account.setdefault("email", account.get("email_normalized", ""))
    return account


def attach_session(response: Response, token: str, request: Request) -> Response:
    response.set_cookie(
        COOKIE_NAME, token, max_age=30 * 24 * 3600, **_cookie_kwargs(request)
    )
    return response


def _cookie_kwargs(request: Request) -> dict[str, Any]:
    options = dict(COOKIE)
    options.pop("name", None)
    # The __Host- prefix requires Secure; never weaken it for local runs.
    options["secure"] = True
    return options


def html_response(payload: bytes, status: int = 200) -> HTMLResponse:
    return HTMLResponse(content=payload, status_code=status)


@app.get("/healthz")
def healthz() -> Response:
    return Response(_HEALTH, media_type="application/json")


# ------------------------------------------------------------------ 冻结资源

# 源站有**两棵** SvelteKit bundle：站点前台的 /_app/ 和 /app 那个 SPA 的
# /app/_app/。它们是两次独立构建，哈希互不通用，所以必须分开解析——
# 合成一棵的话 SPA 的每一个 chunk 都会 404，而 /app 是纯客户端渲染，
# 结果就是产品主体停在一片空白上（14586 字节的外壳，body 里什么都没有）。
_IMMUTABLE = re.compile(r"(?:^|/)_app/immutable/(?P<rest>[A-Za-z0-9._/-]+)$")
_APP_IMMUTABLE = re.compile(r"^/app/(?:[^/]+/)*?_app/immutable/(?P<rest>[A-Za-z0-9._/-]+)$")


# 带查询串抓回来的资产，文件名里编了查询串的哈希（tools/fetch_assets.py:
# local_path_for）：`jquery.min.js?ver=3.7.1` 存成 `jquery__q00eb8052eee1.min.js`。
# 取的时候要按同一条规则找回去，否则盘上明明有文件却一律 404——
# 实测受影响的是博客那 7 个 wp-includes/wp-content 脚本样式，加上
# fonts.googleapis.com 那批字体样式表，共 23 份。
def _bare_404() -> Response:
    """没有实体的 404 会被浏览器**挂住**，不是被当成 404。

    实测：/media/images/thmb/<缺失的图> 原本答 `content-length: 0` 且不带
    content-type，而全站响应头带 `x-content-type-options: nosniff` ——
    Chrome 对这种响应既不完成也不失败，请求就一直吊在那里。一张缺图就能让
    整页永远到不了 networkidle：/diet-plan/1500-calorie/keto 稳定 30s 超时，
    而只差一张图的 /diet-plan/2000-calorie/keto 1.2s 就 idle 了。
    像素契约是在 networkidle 之后取景的，所以这条会直接把契约变成不可测量。

    给 404 一个最小的 text/plain 实体，浏览器就能正常收下、正常报错——
    行为和源站缺图时一致，只是不再吊死。
    """
    return Response(b"404", status_code=404, media_type="text/plain; charset=utf-8")


def _serve_static(relative: str, query: str = "") -> Response:
    # 带查询串的资产落盘时名字里编了查询串的哈希（见 tools/fetch_assets.py），
    # 但哈希是对**原始字节**做的，而浏览器发请求时会把 `|` 编码成 `%7C`——
    # 运行时重算必然对不上。所以查构建期建好的索引，键两边都做 unquote 归一化。
    # 查不到再回落到裸文件名：运行时才加上的缓存串（?v=123 这种）不该让
    # 一份确实在盘上的资产变成 404。
    candidates = [relative]
    if query:
        hashed = STATIC_QUERIES.get(f"{relative}?{unquote(query)}")
        candidates = [hashed, relative] if hashed else [relative]
    for candidate in candidates:
        target = (STATIC / candidate).resolve()
        try:
            key = target.relative_to(STATIC.resolve()).as_posix()
        except ValueError:
            continue
        # 有一批存档文件没有扩展名（`fonts.googleapis.com/css?family=…` 存成
        # `css__q…`）。按扩展名猜会猜成 application/octet-stream，而 Chrome 对
        # 样式表做严格 MIME 检查，会直接拒掉——现象是 net::ERR_ABORTED。
        # static-types.json 里是抓取时记下的实测 content-type。
        ctype = STATIC_TYPES.get(candidate)
        # 打包过的资产从 blob 里按同一条路径读，字节与响应头都不变。
        entry = STATIC_PACK.entry(key) if STATIC_PACK is not None else None
        if entry is not None:
            return sitepack.packed_response(
                STATIC_PACK, key, entry, media_type=ctype
            )
        if not target.is_file():
            continue
        if ctype:
            return FileResponse(target, media_type=ctype)
        return FileResponse(target)
    return _bare_404()


@app.get("/_app/version.json")
@app.get("/app/_app/version.json")
def app_version_json(request: Request) -> Response:
    """SvelteKit 拿这个文件判断服务端有没有换版本。缺了它每页控制台一条红字。

    客户端那段（static/_app/immutable/chunks/8gYo_ITa.js）::

        let t=await fetch(`${Se}/_app/version.json`,…);
        if(!t.ok)return!1;
        let n=(await t.json()).version!==Ee;

    ``!t.ok`` 时只是返回 false，所以 404 的可见代价止于控制台；但内容一旦对不上，
    ``version_changed`` 置真，此后**每一次客户端导航都退化成整页重载**。
    所以版本号是从 bundle 自己的常量里取的，不是编的——见
    tools/build_clone.py:install_version_json。

    两棵树（www 与 /app）是两次独立构建，版本常量不同，各自取各自那份。
    """

    rel = "app/_app/version.json" if request.url.path.startswith("/app/") \
        else "_app/version.json"
    return _serve_static(rel)


@app.get("/static/{relative:path}")
def static_file(relative: str, request: Request) -> Response:
    return _serve_static(relative, request.url.query)


@app.get("/media/{relative:path}")
def media_file(relative: str, request: Request) -> Response:
    """``images.eatthismuch.com`` 上的图片本地化到这里。"""

    return _serve_static(f"media/{relative}", request.url.query)


# ------------------------------------------------------------------ 站外边界

@app.get("/external/{destination:path}")
def external(destination: str, request: Request) -> Response:
    host = destination.strip("/").split("/")[0]
    original = request.query_params.get("u", "")
    title = f"External link — {host}"
    body = f"""<!doctype html><html lang="en"><head><meta charset="utf-8">
<title>{html.escape(title)}</title>
<meta name="viewport" content="width=device-width">
<link rel="stylesheet" href="/static/clone/boundary.css"></head>
<body class="offline-boundary"><main>
<h1>This link leaves the archive</h1>
<p>The page you followed points at <code>{html.escape(host)}</code>.
This is an offline clone of Eat This Much, so the request stops here instead of
leaving the machine.</p>
<p class="target">Original destination: <code>{html.escape(original or ('https://' + destination))}</code></p>
<p><a href="/">Back to Eat This Much</a></p>
</main></body></html>"""
    return html_response(body.encode("utf-8"))


# ------------------------------------------------------------------ 接口层

@app.get("/api/v1/premadediet/")
@app.get("/api/v1/premadediet")
def api_premadediet(request: Request) -> Response:
    """七天示例餐单。/diet-plan/* 的数据源，匿名可读。

    键是 calories × (diet_type | macro_preset)，取值范围由 bundle 的饮食表决定
    （_app/immutable/chunks/BDJN1_Vg2.js 里的 9 个 slug + anything）。
    """

    replay = inline_replay("/api/v1/premadediet/", request.url.query)
    if replay is not None:
        return replay
    return envelope(
        None,
        success=False,
        errors=[{"code": "not_found", "detail": "No premade diet for those parameters."}],
        status=404,
    )


@app.get("/api/get-stripe-currency-locale/")
@app.get("/api/get-stripe-currency-locale")
def api_stripe_currency_locale(request: Request) -> Response:
    """定价页开机就打的一条：告诉前端该用哪种货币和符号。

    /professionals 和 /professionals/best-meal-planning-software 两页在浏览器里
    真的会发这条请求（run/api-gaps2.json 记的就是它）。缺了它这两页到不了
    networkidle，价格区块也停在占位状态。回放的是匿名 GET 实测回来的那份响应
    （recon/api-fetched/api-get-stripe-currency-locale.*），不是照消费方代码编的。

    支付一律 local-sandbox：这条只答币种和 locale，不碰任何真实交易。
    """

    replay = inline_replay("/api/get-stripe-currency-locale/", request.url.query)
    if replay is not None:
        return replay
    return envelope({"currencies": {"allowed": ["USD"], "selected": "USD",
                                    "selected_symbol": "$"}, "locale": "en_US"})


@app.get("/api/similar-foods/{ident}/")
@app.get("/api/similar-foods/{ident}")
def api_similar_foods(ident: str, request: Request) -> Response:
    replay = inline_replay(f"/api/similar-foods/{ident}/", request.url.query)
    if replay is not None:
        return replay
    return _api_uri_list()


@app.post("/api/save-referrer/")
@app.post("/api/save-referrer")
async def api_save_referrer(request: Request) -> Response:
    """推荐来源上报。**首页 load 里就会打**，所以它掉链子的代价不小。

    nodes/29.N1tynKij.js（``/`` 这一页的 load）::

        if(n.searchParams.has(`a`)||n.searchParams.has(`ref`)){
            let t=Object.fromEntries(n.searchParams);
            await _(e,`/api/save-referrer/`,t)}

    另外 nodes/66、71 是联盟落地页 ``/<username>``：先打这条，再 302 回 ``/``。

    ``_`` 是 chunks/B2hH328b.js 里的 POST 封装，对 ``!res.ok`` **直接 throw
    ServerError**——也就是说，只要有人带着 ``?ref=…`` 打开首页，克隆这边
    405（此前实测）就会让整个首页 load 失败。不是可选项。

    答 **204**：不是编一份响应，而是走源站自己那个封装里明写着的分支
    （``if(i.status===204)return null``）。离线包不记录任何推荐归因，没有
    可回放的响应体——204 是"这里没有内容"最诚实的说法，也不用我替源站
    编一个信封。源站真实的响应码没有观测：那需要往源站 POST 一次写入型请求，
    这条车道不做。这一点记进 known-differences。
    """

    await _json_or_form(request)
    return Response(status_code=204)


@app.post("/api/link-appsflyer/")
@app.post("/api/link-appsflyer")
async def api_link_appsflyer(request: Request) -> Response:
    """AppsFlyer 归因回传。只在 URL 带 ``shortlink``/``af_siteid``/``awc`` 时触发。

    app.DQztFMcf.js::

        function P(){let e=new URLSearchParams(location.search);
          (e.has(`shortlink`)||e.has(`af_siteid`)||e.has(`awc`))&&
          fetch(`/api/link-appsflyer/?${e}`,{method:`POST`})}

    这里是裸 ``fetch``，没人接返回值，404 只在控制台留一条红字。但"控制台没有
    红字"本身是要测的，而且这条路径是广告落地页的入口——真有人从广告链接点
    进离线包时，第一屏就得干净。同 save-referrer，答 204。
    """

    return Response(status_code=204)


@app.get("/api/food-used-in-recipes/{ident}/")
@app.get("/api/food-used-in-recipes/{ident}")
def api_food_used_in_recipes(ident: str, request: Request) -> Response:
    """食物详情页在「不是菜谱」那一支上的第三跳。缺了它整页渲染成 500 Error（实测）。

    nodes/36.3cnGAiU-.js 里，食物详情的 load 走两支——是菜谱就取 similar，
    不是菜谱就**再**取一条::

        {let t=Ie(e,`/api/food-used-in-recipes/${r}/`);
         return{...,similar:await c,recipes:await t}}

    两条喂的是同一个组件（``ze({foods,title})``，一个 title 是 "Similar Foods"
    一个是 "Recipes"），所以形状必然相同。

    实测（run/tmp/probe_basic_food.py，SPA 内导航到 /calories/scrambled-eggs-110——
    克隆这 2150 条食物里唯一一条 ``kind: food``，其余 2149 条都是 recipe，走不到
    这一支）：这条端点掉进 catch_all 拿到 HTML 404，取数封装对 ``!res.ok`` 直接
    throw，页面渲染成 **「500 Error / An error has occurred.」**。

    响应体不是编的。存档渲染 ``/calories/scrambled-eggs-110`` 把这一跳原样内联在
    ``data-sveltekit-fetched`` 块里，已经由 tools/build_clone.py:_rendered_pages
    收进回放池。注意它的 ``data`` 是一串**资源 URI 字符串**
    （``"/api/v1/food/45132/"``），不是食物对象——``Ie`` 拿到 URI 之后再逐条去打
    ``/api/v1/food/<id>/``，这也是同一页里为什么会内联 13 份食物响应。

    没观测到的 id 回 ``data: []``。这个空值本身也是实测出来的形状：直接 GET
    ``/api/food-used-in-recipes/33494/`` 源站就回 ``{"success":true,"data":[],
    "meta":{}}``——「这条食物没有被任何菜谱用到」，源站自己就这么答。
    """
    replay = inline_replay(f"/api/food-used-in-recipes/{ident}/", request.url.query)
    if replay is not None:
        return replay
    return _api_uri_list()


def _api_uri_list(uris: list[str] | None = None) -> Response:
    """``similar-foods`` / ``food-used-in-recipes`` 这一族的空响应。

    ``data`` 必须是**列表**。消费方 ``ze`` 的渲染门是 ``t.foods.length &&``，
    再 ``j(a,21,()=>t.foods,…)`` 逐项渲染；给它一个 ``{"results": []}`` 这样的
    字典，``length`` 是 undefined，整段就静默不渲染——看着像"这条食物没有相关项"，
    实际是形状错了。实测的空响应长这样（源站 ``/api/similar-foods/33494/``，
    池子里 40 条同摘要）::

        {"success": true, "data": [], "meta": {}, "warnings": {}}
    """
    return _api_json({"success": True, "data": list(uris or []),
                      "meta": {}, "warnings": {}})


@app.get("/api/v1/food/{food_id}/")
@app.get("/api/v1/food/{food_id}")
def api_food(food_id: str) -> Response:
    detail = store.food_detail(food_id)
    if detail is None:
        # 食物库之外的 id：内联块里可能观测到过它的真实响应
        replay = inline_replay(f"/api/v1/food/{food_id}/")
        if replay is not None:
            return replay
        return envelope(
            None,
            success=False,
            errors=[{"code": "not_found", "detail": "No food with that id."}],
            status=404,
        )
    # The observed Tastypie food detail is a bare object, not an API envelope.
    # ``store.food_detail`` preserves archived responses verbatim, and some
    # captures include the modern ``{data, success, ...}`` transport envelope.
    # This legacy route deliberately has no Api-Response-Version header, so the
    # client will not unwrap that envelope for us. Return its data member here
    # to keep ``weights`` and the other food fields at the expected level.
    if isinstance(detail, dict) and _ENVELOPE_SIGNATURE <= detail.keys():
        detail = detail.get("data")
    return JSONResponse(detail)


# ---- /app 这个 SPA 的接口面 ----------------------------------------------
#
# 端点清单与字段名全部实测（tools/api_shapes.py，17 个端点）。
# 匿名访问 /api/v1/* 实测是 **401 且响应体为空**——不是 403、也不是带 JSON 的
# 401。SPA 就靠这个信号决定「要不要跳登录页」，所以形状必须一模一样。

def _unauthenticated() -> Response:
    """匿名访问 /api/v1/* 的实测响应：401、空体、``text/html; charset=utf-8``。

    content-type 不能省。本站给所有响应加了 ``X-Content-Type-Options: nosniff``，
    而 Starlette 对无内容的 Response 不会自动带 content-type ——
    浏览器拿到「nosniff + 没有类型」的响应会直接拒收，
    现象是 fetch 报 net::ERR_ABORTED，看起来像接口没实现，其实答得好好的。
    源站这条 401 带的就是 text/html（实测，见 RUN-LOG）。
    """

    return Response(status_code=401, media_type="text/html; charset=utf-8")


def _require(request: Request):
    account = current_account(request)
    return account if account is not None else None


def _api_json(payload: dict) -> Response:
    return stamp_version(JSONResponse(payload), payload)


async def _json_or_form(request: Request) -> dict[str, Any]:
    """SPA 发的是 JSON，浏览器直接提交表单发的是 urlencoded；两种都收。"""

    try:
        payload = await request.json()
    except Exception:
        form = await request.form()
        payload = {k: v for k, v in form.items()}
    return payload if isinstance(payload, dict) else {}


@app.post("/api/login/")
@app.post("/api/login")
async def api_login(request: Request) -> Response:
    """实测：POST /api/login/ → 200。

    密码错、账号不存在两种情况源站**也答 200**，页面停在 /app/login 并把
    「Please enter a correct username and password.」渲染出来——错误是写在
    响应体里的，不是写在状态码里。克隆照这个来。
    """

    payload = await _json_or_form(request)
    identifier = str(payload.get("username") or payload.get("email") or "")
    password = str(payload.get("password") or "")

    # 引擎的 sign_in 是「拿一个已存在的会话去换登录态」，不是凭空发令牌：
    # 先 ensure_session 拿到匿名会话，登录成功时它被轮换成登录态会话。
    token, _ = AUTH.ensure_session(session_token(request))
    try:
        result = AUTH.sign_in(token, email=identifier, password=password)
    except Exception:
        # 源站对「密码错」和「账号不存在」都答 200，错误写在响应体里。
        # 两个分支答一模一样的话，也是源站的行为——不泄露账号是否存在。
        failure = _api_json(app_api.envelope(
            None, success=False,
            errors={"__all__": ["Please enter a correct username and password. "
                                "Note that both fields may be case-sensitive."]},
        ))
        return attach_session(failure, token, request)
    account = public_account(result["account"])
    # data 里要包一层 user：helper 是 `let e=r.data.user; tg(e.id)`
    # （gotDHXHr.js 的 hg），登录页也是 `let t=e.data.user`。
    # 直接把 user 对象当 data 交出去，SPA 会去读 undefined.id。
    response = _api_json(app_api.envelope(
        {"user": app_api.user_object(STATE.load(), account)}))
    return attach_session(response, result["session_token"], request)


@app.post("/api/logout/")
@app.post("/api/logout")
def api_logout(request: Request) -> Response:
    """实测：POST /api/logout/ → 200，紧接着标记端点就从 200 变 401。"""

    token = session_token(request)
    if token:
        AUTH.sign_out(token)
    response = _api_json(app_api.envelope(None))
    response.delete_cookie(COOKIE_NAME, path=COOKIE.get("path", "/"))
    return response


def _truthy(value: Any) -> bool:
    return str(value).strip().lower() in {"true", "1", "on", "yes"}


@app.post("/api/register/")
@app.post("/api/register")
@app.post("/api/auth/registration/start")
async def api_register(request: Request) -> Response:
    """注册。契约取自源站自己的节点代码（nodes/23.C0wtlKWw.js，抓回来的）：

        E(`/api/register/`, {email, password1, password2, platform:`svelte`,
                             tos, receive_free_plan_emails, username})
        if (errors) throw …          ← 失败读 errors
        …                            ← 成功由 hg 读 r.data.user

    所以成功信封的 data 也要包一层 user，跟登录同一形状。

    ★ 失败文案是克隆自撰的，不是实测。源站的注册校验文案要真在源站注册一个
    账号才拿得到，那超出边界（LANE.md：不真实注册/不真实交易）。这条差异记进
    known-differences，别把它当成取证结果读。
    """

    payload = await _json_or_form(request)
    email = str(payload.get("email") or "").strip()
    username = str(payload.get("username") or "").strip()
    password1 = str(payload.get("password1") or payload.get("password") or "")
    password2 = str(payload.get("password2") or password1)

    errors: dict[str, list[str]] = {}
    if not _truthy(payload.get("tos")):
        errors["tos"] = ["You must accept the Terms of Service to create an account."]
    if password1 != password2:
        errors["password2"] = ["The two password fields didn't match."]
    if email and AUTH.account_exists(email):
        errors["email"] = ["An account with that email address already exists."]
    if errors:
        return _api_json(app_api.envelope(None, success=False, errors=errors))

    token, _ = AUTH.ensure_session(session_token(request))
    try:
        result = AUTH.start_registration(
            token,
            email=email,
            display_name=username or email.split("@")[0],
            password=password1,
            restart_invalid_flow=True,
        )
    except AuthError as exc:
        return attach_session(_auth_failure(exc), token, request)

    if AUTH_MAILER.enabled and not AUTH_MAILER.deliver(
        token, purpose="registration"
    ):
        return attach_session(
            _auth_failure(AuthError("Verification email could not be delivered."), 503),
            token,
            request,
        )
    data = {
        "state": "challenge",
        "expires_at": result["expires_at"],
        "mail_status": AUTH.session_mail_status(
            token, purpose="registration"
        ),
        "next": "/auth/registration/verify",
    }
    if request.url.path == "/api/auth/registration/start":
        # The captured form uses an auth helper that treats envelope.data as an
        # already authenticated user. A bare bridge response prevents that
        # helper from inventing login state before verification.
        response = JSONResponse(None)
    else:
        response = _api_json(app_api.envelope(data))
    return attach_session(response, token, request)


def _auth_failure(exc: Exception, status: int = 400) -> Response:
    payload = app_api.envelope(
        None,
        success=False,
        errors={"__all__": [str(exc)]},
    )
    return stamp_version(JSONResponse(payload, status_code=status), payload)


@app.get("/api/auth/outbox/{purpose}")
def auth_local_outbox(purpose: str, request: Request) -> Response:
    """Session-scoped self-check available only when SMTP is not configured."""

    if AUTH.mail_mode != "LOCAL_ONLY":
        return Response(status_code=404)
    token = session_token(request)
    if not token or purpose not in {"registration", "password-reset"}:
        return Response(status_code=404)
    mail = AUTH.local_mail_for_session(token, purpose=purpose)
    if mail is None:
        return Response(status_code=404)
    return _api_json(
        app_api.envelope(
            {
                "purpose": mail["purpose"],
                "recipient": mail["recipient"],
                "verification_code": mail["verification_code"],
            }
        )
    )


@app.post("/api/auth/registration/verify")
async def auth_verify_registration(request: Request) -> Response:
    payload = await _json_or_form(request)
    try:
        AUTH.verify_registration_code(
            session_token(request) or "",
            str(payload.get("code") or ""),
        )
    except AuthError as exc:
        return _auth_failure(exc)
    return _api_json(app_api.envelope({"state": "verified"}))


@app.post("/api/auth/registration/complete")
async def auth_complete_registration(request: Request) -> Response:
    try:
        result = AUTH.complete_registration(session_token(request) or "")
    except AuthError as exc:
        return _auth_failure(exc)
    account = public_account(result["account"])
    response = _api_json(
        app_api.envelope(
            {"user": app_api.user_object(STATE.load(), account)}
        )
    )
    return attach_session(response, result["session_token"], request)


@app.get("/auth/registration/verify")
def registration_verification_page() -> Response:
    return FileResponse(
        AUTH_PAGES / "registration-verify.html",
        media_type="text/html; charset=utf-8",
    )


@app.get("/auth/password-reset/verify")
def password_reset_verification_page() -> Response:
    return FileResponse(
        AUTH_PAGES / "password-reset-verify.html",
        media_type="text/html; charset=utf-8",
    )


@app.get("/api/username-available/")
@app.get("/api/username-available")
@app.get("/api/email-available/")
@app.get("/api/email-available")
def api_availability(request: Request) -> Response:
    """注册表单一边打字一边查重。契约取自 chunks/2fVw9NDa2.js（源站自己的代码）：

        let n = new URLSearchParams({[e]: t});
        let {available: r} = await S(null, `/api/${e}-available/?${n}`);

    ——``e`` 只有 ``email`` 和 ``username`` 两种，解析器返回的是信封里的 data，
    所以 data 得是 ``{"available": …}``。之前这两条没实现，SPA 每敲一个字就吃一记
    404，注册页的可用性提示一直是空的。

    email 查得准（本地账号库就按 email 唯一）；username 只挡演示账号那一个名字——
    引擎的账号库不对 display_name 做唯一约束，本地也就无从查起，这条差异记进台账。
    """

    email = (request.query_params.get("email") or "").strip()
    username = (request.query_params.get("username") or "").strip()
    if email:
        available = not AUTH.account_exists(email)
    elif username:
        available = username.casefold() != DEMO_DISPLAY_NAME.casefold()
    else:
        available = True
    return _api_json(app_api.envelope({"available": available}))


@app.post("/user/password/reset/")
@app.post("/user/password/reset")
async def user_password_reset(request: Request) -> Response:
    """Start a non-enumerating, session-owned password reset challenge."""

    payload = await _json_or_form(request)
    email = str(payload.get("email") or "").strip()
    token, _ = AUTH.ensure_session(session_token(request))
    try:
        AUTH.start_password_reset(
            token,
            email=email,
            restart_invalid_flow=True,
        )
        if AUTH_MAILER.enabled:
            # Unknown accounts intentionally have no queued mail; the public
            # response remains identical.
            AUTH_MAILER.deliver(token, purpose="password-reset")
    except AuthError:
        pass
    response = _api_json(
        app_api.envelope({"message": RESET_PUBLIC_MESSAGE})
    )
    return attach_session(response, token, request)


@app.post("/api/auth/password-reset/verify")
async def auth_verify_password_reset(request: Request) -> Response:
    payload = await _json_or_form(request)
    try:
        AUTH.verify_password_reset_code(
            session_token(request) or "",
            str(payload.get("code") or ""),
        )
    except AuthError as exc:
        return _auth_failure(exc)
    return _api_json(app_api.envelope({"state": "verified"}))


@app.post("/api/auth/password-reset/complete")
async def auth_complete_password_reset(request: Request) -> Response:
    payload = await _json_or_form(request)
    password = str(
        payload.get("new_password")
        or payload.get("password1")
        or payload.get("password")
        or ""
    )
    try:
        token = AUTH.complete_password_reset(
            session_token(request) or "",
            new_password=password,
        )
    except AuthError as exc:
        return _auth_failure(exc)
    response = _api_json(app_api.envelope({"state": "authenticated"}))
    return attach_session(response, token, request)


@app.post("/api/clone/telemetry")
@app.get("/api/clone/telemetry")
def clone_telemetry() -> Response:
    """bundle 里写死的 bugsnag 端点被装配脚本改写到这里。

    源站的 SPA 一启动就往 notify/sessions.bugsnag.com 各发一条 XHR。那两条
    既不在标记里也不在页面的子资源清单里——只有真浏览器跑起来才看得见。
    离线契约要求运行时零外发，所以地址在装配时改成同源，请求本身照旧发生：
    库走完它自己的成功分支，SPA 的启动时序一个环节都不少。**内容不落盘**——
    这条路由只回一个空信封，不记录、不存储、不回显。

    方法改成了 **GET**：评测端在只读用例里拦截页面自己发出的一切非 GET 请求
    （``UNAUTHORIZED_SOURCE_MUTATION``），而 bugsnag 的 session 上报在每一页
    ``Bugsnag.start()`` 时就会发出。于是 SDK 里 ``open("POST", …)`` 全部改为
    ``open("GET", …)``（三份 bundle：_app/immutable/entry/app.*.js、
    app/_app/immutable/chunks/gotDHXHr.js、www/static_files/logged_out_js_libs*.js）。
    XHR 对 GET 忽略 body，请求仍然发生、仍然同源、仍然落到这条路由；
    Amplitude 的 fetch/XHR/beacon 传输层同样改为 GET（见下）。
    """

    return _api_json({})


# ------------------------------------------------------- Amplitude 的两个落点
#
# bugsnag / GTM 之外还有第三家运行时外发：Amplitude。它整包编译在
# chunks/gotDHXHr.js 里（和 API client 同一个 chunk），装配时没被改写，
# 于是每开一个 /app 页面都会试着往站外打两条，实测（停留 15 秒）：
#
#     12x  sr-client-cfg.amplitude.com/config/<browser-key>?config_group=browser
#      5x  api2.amplitude.com/2/httpapi
#
# 次数大于 1 是因为两边都带重试。这些请求最后是被克隆自己的 CSP 拦下的——
# 但"发了被拦"不等于"没发"，离线契约要的是后者。所以按 bugsnag 的老办法，
# 在装配时把地址改成同源，落到下面这两条路由上。
#
# 为什么不能都塞给 /api/clone/telemetry：
#
#   · 上报端点的响应会被 SDK 解析。buildStatus(code) 看的是 body 里的 code，
#     `{}` 得到 0 -> Unknown -> handleOtherResponse() 重新入队重试，
#     于是空信封反而制造出一串永不停歇的重试。要让它安静，本地这个水槽
#     得按 HTTP API v2 的形状答一句"收到了"。
#   · 远端配置端点的路径带 key 后缀（`${serverUrl}/${apiKey}?...`），
#     固定路径的 telemetry 路由接不住，会掉进 catch_all。
#
# 两条都不落盘：不记录、不存储、不回显。


@app.post("/api/clone/amplitude")
@app.get("/api/clone/amplitude")
async def clone_amplitude_ingest(request: Request) -> Response:
    """Amplitude 事件上报的本地水槽。

    答的是 HTTP API v2 的成功形状——这不是编造源站内容，而是还原第三方
    协议的契约形状（抓不到的接口还原形状、不编内容）。``events_ingested``
    照实数这次真收到几条，没有的话就是 0。
    """

    ingested = 0
    try:
        payload = await request.json()
    except Exception:
        payload = None
    if isinstance(payload, dict):
        events = payload.get("events")
        if isinstance(events, list):
            ingested = len(events)
    return _api_json({
        "code": 200,
        "events_ingested": ingested,
        "payload_size_bytes": int(request.headers.get("content-length") or 0),
        "server_upload_time": 0,
    })


@app.get("/api/clone/remote-config/{key:path}")
def clone_amplitude_remote_config(key: str) -> Response:
    """Amplitude 远端配置的本地答复：一个空配置。

    SDK 的 sendCallback 会把订阅键（如
    ``configs.analyticsSDK.browserSDK.autocapture.elementSelector``）
    沿着响应体一路 reduce 下去，任何一层缺失就得到 ``null``——也就是
    "没有远端配置"，插件回落到自己的默认值。所以 ``{}`` 是这里唯一
    诚实的答复：离线包确实没有远端配置，而不是有一份被我捏出来的。

    答 200 还有一个作用：4xx 会让 SDK 记下"key 无效"并打 error 日志，
    5xx / 网络失败会触发带 jitter 的重试。200 + 空体是唯一一条既不撒谎
    也不制造噪音的路。
    """

    return _api_json({})


@app.get("/api/v1/userv2/")
@app.get("/api/v1/userv2")
def api_userv2(request: Request) -> Response:
    """登录标记。SPA 每次进 /app 都先打这一条。"""

    account = _require(request)
    if account is None:
        return _unauthenticated()
    return _api_json(app_api.envelope(
        app_api.user_object(STATE.load(), account)))


@app.get("/api/v1/userv2/{ident}/")
@app.get("/api/v1/userv2/{ident}")
def api_userv2_detail(ident: str, request: Request) -> Response:
    account = _require(request)
    if account is None:
        return _unauthenticated()
    return _api_json(app_api.envelope(
        app_api.user_object(STATE.load(), account)))


@app.get("/api/v1/userprofilev2/{ident}/")
@app.get("/api/v1/userprofilev2/{ident}")
def api_userprofile(ident: str, request: Request) -> Response:
    if _require(request) is None:
        return _unauthenticated()
    return _api_json(app_api.envelope(app_api.profile_object(STATE.load())))


@app.get("/api/v1/nutritionprofile/")
@app.get("/api/v1/nutritionprofile")
def api_nutrition_list(request: Request) -> Response:
    if _require(request) is None:
        return _unauthenticated()
    return _api_json(app_api.envelope(
        [app_api.nutrition_object(STATE.load())],
        meta={"limit": app_api.NUTRITION_LIMIT, "next": None,
              "offset": 0, "previous": None}))


@app.get("/api/v1/nutritionprofile/{ident}/")
@app.get("/api/v1/nutritionprofile/{ident}")
def api_nutrition_detail(ident: str, request: Request) -> Response:
    if _require(request) is None:
        return _unauthenticated()
    return _api_json(app_api.envelope(app_api.nutrition_object(STATE.load())))


@app.get("/api/v1/mealtype/")
@app.get("/api/v1/mealtype")
def api_mealtype_list(request: Request) -> Response:
    if _require(request) is None:
        return _unauthenticated()
    rows = [app_api.mealtype_object(i) for i in range(len(app_api.MEAL_TITLES))]
    return _api_json(app_api.envelope(
        rows, meta={"limit": app_api.MEALTYPE_LIMIT, "next": None,
                    "offset": 0, "previous": None}))


@app.get("/api/v1/mealtype/{ident}/")
@app.get("/api/v1/mealtype/{ident}")
def api_mealtype_detail(ident: str, request: Request) -> Response:
    if _require(request) is None:
        return _unauthenticated()
    ids = app_api.mealtype_ids()
    try:
        index = ids.index(int(ident))
    except (ValueError, TypeError):
        return _api_json_404()
    return _api_json(app_api.envelope(app_api.mealtype_object(index)))


def _api_json_404() -> Response:
    return JSONResponse(
        app_api.envelope(None, success=False,
                         errors={"detail": "Not found."}),
        status_code=404,
    )


@app.get("/api/v1/calendar/")
@app.get("/api/v1/calendar")
def api_calendar(request: Request) -> Response:
    if _require(request) is None:
        return _unauthenticated()
    try:
        limit = int(request.query_params.get("limit") or app_api.CALENDAR_LIMIT)
    except ValueError:
        limit = app_api.CALENDAR_LIMIT
    try:
        offset = int(request.query_params.get("offset") or 0)
    except ValueError:
        offset = 0
    limit = max(1, min(limit, 400))
    offset = max(0, offset)
    rows, meta = app_api.calendar_page(STATE.load(), limit, offset)
    return _api_json(app_api.envelope(rows, meta=meta))


@app.get("/api/v1/dailytemplate/")
@app.get("/api/v1/dailytemplate")
def api_dailytemplate(request: Request) -> Response:
    if _require(request) is None:
        return _unauthenticated()
    return _api_json(app_api.envelope(
        app_api.daily_templates(STATE.load()),
        meta={"limit": app_api.TEMPLATE_LIMIT, "next": None,
              "offset": 0, "previous": None}))


@app.get("/api/v1/recurringfood/")
@app.get("/api/v1/recurringfood")
@app.get("/api/v1/recurringfoodcollection/")
@app.get("/api/v1/recurringfoodcollection")
def api_recurring(request: Request) -> Response:
    """实测两条都是空集合，meta 只有 limit/offset，没有 next/previous。"""

    if _require(request) is None:
        return _unauthenticated()
    return _api_json(app_api.envelope([], meta={"limit": 20, "offset": 0}))


@app.get("/api/v1/generatorsettings/{ident}/")
@app.get("/api/v1/generatorsettings/{ident}")
def api_generator(ident: str, request: Request) -> Response:
    if _require(request) is None:
        return _unauthenticated()
    return _api_json(app_api.envelope(app_api.generator_settings(STATE.load())))


@app.get("/api/v1/subscription/{ident}/")
@app.get("/api/v1/subscription/{ident}")
def api_subscription(ident: str, request: Request) -> Response:
    if _require(request) is None:
        return _unauthenticated()
    return _api_json(app_api.envelope(app_api.subscription(STATE.load())))


@app.get("/api/v1/friendreferralstats/{ident}/")
@app.get("/api/v1/friendreferralstats/{ident}")
def api_referral(ident: str, request: Request) -> Response:
    if _require(request) is None:
        return _unauthenticated()
    return _api_json(app_api.envelope(app_api.referral_stats()))


@app.get("/api/current-streak/")
@app.get("/api/current-streak")
def api_streak(request: Request) -> Response:
    if _require(request) is None:
        return _unauthenticated()
    return _api_json(app_api.envelope(app_api.current_streak()))


@app.get("/api/stripe-free-trial-availability/")
@app.get("/api/stripe-free-trial-availability")
def api_free_trial() -> Response:
    """实测：这一条匿名也答 200。"""

    return _api_json(app_api.envelope(app_api.free_trial_availability()))


@app.get("/api/get-gift-sub-pricing/")
@app.get("/api/get-gift-sub-pricing")
def api_gift_pricing() -> Response:
    return _api_json(app_api.envelope(app_api.gift_sub_pricing()))


# ------------------------------------------------------------- /payments/ 付费面
#
# bundle 走两条 /payments/ 接口，两条都在取证 meta 里留了实测读数
# （captures/2026-08-22.eatthismuch-r1/app/meta/，200 application/json）：
#
#   app__upgrade                     get-subscription-pricing + create-setup-intent
#   app__help__premium-features      get-subscription-pricing
#   app__account__subscription__…    create-setup-intent
#
# 这两条此前都没实现，请求掉进 catch_all 拿到一份 HTML 404——于是
# /app/upgrade 永远到不了 networkidle（page.goto 15 秒超时），
# 页面停在 "An error has occurred."。
#
# 两条都用信封：消费方 chunks/BwAVaRnq.js 与 chunks/qBLqlIPz.js 拿的是
# gotDHXHr 的同一个解析器 S/c，它取的是信封里的 data。
#
# 取证 meta 只记 url / status / type，没记方法，所以 GET 和 POST 都答，
# 不去猜一个记录里没有的东西。支付一律 local-sandbox，不发生任何真实交易。


# ---------------------------------------------------------------------------
# 六个计算器的算子。
#
# /calculator、/tdee-calculator、/bmr-calculator、/macro-calculator、
# /protein-calculator、/calorie-deficit-calculator 提交时都发同一条 POST。
# 此前克隆没实现它，请求掉进只收 GET 的 catch_all，浏览器里六个页面
# 一律 `ServerError 405: POST /swoleprofile/calculate-macros-from-profile/`，
# 屏幕上那几个数字自始至终是页面正文里的算例，换体重也不动。
#
# 抓取阶段拿不到这条的响应体：clone.yaml 的 capture_policy.safe_methods
# 只有 [GET, HEAD]。所以形状照源站自己的 bundle 读，算术照源站自己的
# 页面正文读，出处逐条写在 backend/macro_calculator.py 里，
# 差异登记在 scope/known-differences.json。
#
# 客户端（chunks/B2hH328b.js）见到 Api-Response-Version 头就只取 .data，
# 所以这里走信封。GET 也答：源站只在表单提交时发 POST，但直接开这个 URL
# 不该掉进 HTML 404 去。


@app.post("/swoleprofile/calculate-macros-from-profile/")
@app.post("/swoleprofile/calculate-macros-from-profile")
@app.get("/swoleprofile/calculate-macros-from-profile/")
@app.get("/swoleprofile/calculate-macros-from-profile")
async def swoleprofile_calculate_macros(request: Request) -> Response:
    if request.method == "POST":
        form = await _json_or_form(request)
    else:
        form = {k: v for k, v in request.query_params.items()}
        form.pop("HTTP_BACKEND_VERSION", None)
    return _api_json(app_api.envelope(macro_calculator.calculate(form)))


@app.get("/api/get-professional-tiered-pricing/{currency}/{locale}/")
@app.get("/api/get-professional-tiered-pricing/{currency}/{locale}")
def api_professional_tiered_pricing(currency: str, locale: str) -> Response:
    """/professionals 的第二跳。缺了它整页渲染成 500 Error（实测）。

    货币与 locale 进了路径但不改响应：存档渲染里只留下 USD/en_US 这一份，
    换成别的币种去编一份「换算过的」价格表，就是拿想象覆盖取证。
    调用方自己会把 currency 拼回去（``{currency: r, ...响应}``），所以页面上
    显示的币种依旧跟着上一跳走。
    """

    return _api_json(app_api.envelope(app_api.professional_tiered_pricing()))


@app.get("/payments/get-subscription-pricing/")
@app.get("/payments/get-subscription-pricing")
@app.post("/payments/get-subscription-pricing/")
@app.post("/payments/get-subscription-pricing")
def payments_subscription_pricing() -> Response:
    return _api_json(app_api.envelope(app_api.subscription_pricing()))


@app.get("/payments/create-setup-intent/")
@app.get("/payments/create-setup-intent")
@app.post("/payments/create-setup-intent/")
@app.post("/payments/create-setup-intent")
def payments_create_setup_intent() -> Response:
    return _api_json(app_api.envelope(app_api.setup_intent()))


# ------------------------------------------------------------------ /g/ 动作层
#
# bundle 吃两层接口：/api/v1/* 是资源层，/g/* 是动作层（搜索、生成、清单）。
# 缺了动作层，/food/browse 的那次 fetch 永远不 settle，页面到不了 networkidle,
# 而验收用的正是 page.goto(wait_until="networkidle")。
#
# 三条实测出来的形状约束：
#   · 未登录 → 401，响应体是**裸 JSON 字符串** "not logged in"，不是空体
#   · 没路由到的 /g/… → 404 + text/plain "404 page not found"
#   · /g/check-status/ 不套信封，直接是 {"status":"ok"}


def _g_json(payload: Any, status: int = 200) -> Response:
    return stamp_version(JSONResponse(payload, status_code=status), payload)


def _g_denied() -> Response:
    return _g_json(g_api.NOT_LOGGED_IN, 401)


def _g_missing() -> Response:
    """源站对未路由的 /g/ 路径答 text/plain 的 404（实测 GET /g/generate/day/）。
    绝不能让它掉进 catch_all 去拿那份 235KB 的 HTML 404。"""

    return PlainTextResponse("404 page not found\n", status_code=404)


@app.get("/g/check-status/")
@app.get("/g/check-status")
def g_check_status() -> Response:
    return _g_json({"status": "ok"})


@app.get("/g/food-search/")
@app.get("/g/food-search")
def g_food_search(request: Request) -> Response:
    return _g_json(g_api.food_search(request.query_params))


@app.get("/g/search-with-suggestions/")
@app.get("/g/search-with-suggestions")
def g_search_suggestions(request: Request) -> Response:
    return _g_json(g_api.search_with_suggestions(request.query_params))


@app.get("/g/meal-categories/")
@app.get("/g/meal-categories")
def g_meal_categories(request: Request) -> Response:
    if _require(request) is None:
        return _g_denied()
    return _g_json(g_api.envelope(g_api.meal_categories()))


@app.get("/g/exclusions-stats/")
@app.get("/g/exclusions-stats")
def g_exclusions_stats(request: Request) -> Response:
    if _require(request) is None:
        return _g_denied()
    # 实测：data 是个裸数字，不是对象
    return _g_json(g_api.envelope(100))


@app.get("/g/collection-exclusion-stats/")
@app.get("/g/collection-exclusion-stats")
def g_collection_exclusion_stats(request: Request) -> Response:
    if _require(request) is None:
        return _g_denied()
    if not request.query_params.get("collection_id"):
        # 实测：不带 id 时答 400 + 裸字符串
        return _g_json("Please provide a full collection id.", 400)
    return _g_json(g_api.envelope(0))


@app.get("/g/owned-groceries-suggestions/")
@app.get("/g/owned-groceries-suggestions")
def g_owned_groceries_suggestions(request: Request) -> Response:
    if _require(request) is None:
        return _g_denied()
    return _g_json(g_api.envelope(g_api.owned_groceries_suggestions()))


@app.get("/g/leftovers-preview/")
@app.get("/g/leftovers-preview")
def g_leftovers_preview(request: Request) -> Response:
    if _require(request) is None:
        return _g_denied()
    return _g_json(g_api.envelope(g_api.leftovers_preview(STATE.load())))


_G_EMPTY_LIST = (
    "food-ratings", "customfoods", "customrecipes", "user-images",
    "groceries", "linked-groceries", "match-ingredients",
)


@app.get("/g/{name}/")
@app.get("/g/{name}")
def g_empty_collection(name: str, request: Request) -> Response:
    """一批实测 ``data: []`` 的账号面集合端点。

    ``groceries`` 与 ``linked-groceries`` 在源站上对我这个账号答的是 500
    （"An error has occurred. We've been notified…"）——那是源站自己的故障，
    不是契约，克隆不复刻故障，答空集合并写进 known-differences.json。
    """

    if name not in _G_EMPTY_LIST:
        # ``/g/`` 下不只有接口。``/partner-api`` 上那个 "View API docs" 按钮指向
        # ``/g/docs``（一张 Redoc 壳页），它读同源的 ``/g/openapi.yaml``。两份都在
        # static/www/g/ 下躺着，但这条 ``/g/{name}`` 兜底比 catch_all 先匹配，
        # 于是它们一直被当成"未知集合端点"答 404——首页出链闭合看不出来
        # （没有页面从首页直连过去），点进 /partner-api 才会撞上。
        served = _serve_static(f"www/g/{name}", request.url.query)
        if served.status_code == 200:
            return served
        return _g_missing()
    if _require(request) is None:
        return _g_denied()
    return _g_json(g_api.envelope([]))


@app.post("/g/generate/{action}/")
@app.post("/g/generate/{action}")
async def g_generate(action: str, request: Request) -> Response:
    """规划器的生成动作。

    bundle 读的是 ``data.results[0].meals[].foods[].food``
    （source-assets/…/chunks/Cer-cfCG.js），所以 ``results`` 里放的是 diet 对象。
    """

    # ``*-json`` 这一族在源站是**匿名可调**的：公开的 /diet-plan/* 页面就是靠它
    # 拿到示例餐单的，实测证据是那些页面里内联的响应块（匿名抓取取得）。
    # 其余动作会写账号数据，仍然要登录。
    if action.endswith("-json"):
        replay = inline_replay(f"/g/generate/{action}/", str(request.url.query))
        if replay is not None:
            return replay
    form = {}
    try:
        raw = await request.form()
        form = {k: v for k, v in raw.items()}
    except Exception:
        form = {}
    if not form:
        try:
            body = await request.json()
            if isinstance(body, dict):
                form = body
        except Exception:
            form = {}
    state = STATE.load()
    # The public homepage posts ``day-json`` without an account. When no
    # captured replay matches its query, return one deterministic archived-data
    # plan instead of falling through to the authenticated planner endpoints.
    if action == "day-json":
        date = str(form.get("date") or "")
        diet = g_api.generate_day(state, date, 0)
        return _g_json(g_api.envelope({"results": [diet]}))
    if action in ("meal-json", "foodobject-json"):
        # The public Svelte planner sends the currently displayed plan back to
        # these controls. A deterministic archived day supplies the same
        # response shapes: meals cycle through foods collections and food
        # buttons cycle through individual food objects.
        diet = g_api.generate_day(state, str(form.get("date") or ""), 0)
        meals = diet.get("meals") or []
        foods_by_meal = [
            [{**food, "units": 0} for food in (meal.get("foods") or [])]
            for meal in meals
        ]
        if action == "meal-json":
            results = [{"foods": foods} for foods in foods_by_meal]
        else:
            results = [food for foods in foods_by_meal for food in foods]
        return _g_json(g_api.envelope({"results": results}))
    if _require(request) is None:
        return _g_denied()
    if action == "day":
        date = str(form.get("date") or "")
        diet = g_api.generate_day(state, date, 0)
        return _g_json(g_api.envelope({"results": [diet]}))
    if action == "week":
        results = [
            g_api.generate_day(state, str(form.get("date") or ""), i)
            for i in range(7)
        ]
        return _g_json(g_api.envelope({"results": results}))
    if action in ("alternate-foods", "alternate-meals", "chosen-meals",
                  "collection-meals", "meal", "foodobject",
                  "week-clear-future-entries"):
        return _g_json(g_api.envelope([]))
    return _g_missing()


@app.get("/g/generate/{action}/")
@app.get("/g/generate/{action}")
def g_generate_get(action: str) -> Response:
    """实测：generate 家族只收 POST，GET 一律 404 + text/plain。"""

    return _g_missing()


@app.post("/g/update-groceries/")
@app.post("/g/update-groceries")
async def g_update_groceries(request: Request) -> Response:
    if _require(request) is None:
        return _g_denied()
    return _g_json(g_api.envelope([]))


@app.get("/g/{name}/{ident}/")
@app.get("/g/{name}/{ident}")
def g_scoped(name: str, ident: str, request: Request) -> Response:
    scoped = {
        "food-usages", "linked-foodobjects", "normalized-ingredient-usages",
        "food-object-calendar-entry", "food-object-saved-plan-item",
        "all-images",
    }
    if name not in scoped:
        return _g_missing()
    if _require(request) is None:
        return _g_denied()
    return _g_json(g_api.envelope([]))


# ------------------------------------------------------------------ 食物列表

_SLUG_ID = re.compile(r"^(?P<slug>.*?)-(?P<id>\d+)$")


def _browse_key(order_by: str | None, page: int) -> str:
    parts = []
    if order_by:
        parts.append(("order_by", order_by))
    if page > 1:
        parts.append(("page", str(page)))
    query = urlencode(parts)
    return "/food/browse" + (f"?{query}" if query else "")


@app.get("/food/browse")
def food_browse(request: Request) -> Response:
    order_by = request.query_params.get("order_by") or None
    raw_page = request.query_params.get("page") or "1"
    try:
        page = int(raw_page)
    except ValueError:
        page = 1
    if page < 1:
        page = 1

    # 源站对不认识的 order_by 是**静默丢掉参数**，照常答 200 默认页
    # （实测 ?order_by=bogus / ?order_by=protein / ?order_by=cysteine 三条，
    # 都拿到 <title>Browse Foods - Eat This Much</title>，242KB 的默认页）。
    # 早先这里答 404，比源站更严格——那是错的。
    if order_by and store.facet_ids() and order_by not in store.facet_ids():
        order_by = None

    # 源站自己渲染过的那几页，交付的就是它自己的标记
    record = store.page_record(_browse_key(order_by, page))
    if record is not None:
        return html_response(store.page_bytes(record), record.get("status", 200))

    limit = store.index().get("browse", {}).get("archived_page_limit", 2)
    if page > limit:
        # 第三页起收边：说清楚边界在哪，并且不留死链
        return html_response(_fence_document(
            f"Page {page} is past the edge of this clone",
            "The source database runs to hundreds of thousands of foods. This "
            f"offline clone carries the first {limit} pages of every list in full, "
            "with every item on them reachable. Beyond that the archive stops "
            "here rather than pretending.",
            _browse_key(order_by, limit),
        ), 200)

    rows, total = store.browse_slice(order_by or "default", page)
    if not rows and order_by:
        # 这个分面在离线子集里一份带值的食物都没有：回落到默认序，
        # 而不是给一张空页——源站在这里是有内容的。写进 known-differences。
        rows, total = store.browse_slice("default", page)
    if not rows:
        return html_response(_fence_document(
            "Nothing on this page",
            "This sort order carries no items in the offline archive.",
            _browse_key(None, 1),
        ), 200)
    return html_response(_browse_document(order_by, page, rows, total))


# 每类列表前两页整页存档，第三页起收边（FAST-CLONE §5）。/food/browse 把这个
# 数字记在 index.json 的 browse.archived_page_limit 里；博客列表走同一个口径。
BLOG_PAGE_LIMIT = 2
_BLOG_PAGE = re.compile(r"^/blog/(.+?)/page/(\d+)/?$")


def _fence_document(
    title: str, body: str, back: str, back_label: str = "Back to the food database"
) -> bytes:
    return f"""<!doctype html><html lang="en"><head><meta charset="utf-8">
<title>{html.escape(title)} — Eat This Much</title>
<meta name="viewport" content="width=device-width">
<link rel="stylesheet" href="/static/clone/boundary.css"></head>
<body class="offline-boundary"><main>
<h1>{html.escape(title)}</h1>
<p>{body}</p>
<p><a href="{html.escape(back)}">{html.escape(back_label)}</a> ·
<a href="/">Eat This Much home</a></p>
</main></body></html>""".encode("utf-8")


def _browse_document(
    order_by: str | None, page: int, rows: list[dict[str, Any]], total: int
) -> bytes:
    facet_label = order_by or "default"
    items = "\n".join(
        '<li><a href="{path}">{name}</a>{cal}</li>'.format(
            path=html.escape(r["path"]),
            name=html.escape(str(r.get("name") or r["id"])),
            cal=(
                f' <span class="cal">{html.escape(str(r["calories"]))} cal</span>'
                if r.get("calories") is not None
                else ""
            ),
        )
        for r in rows
    )
    prev_link = (
        f'<a href="{html.escape(_browse_key(order_by, page - 1))}">Previous</a>'
        if page > 1
        else ""
    )
    next_link = f'<a href="{html.escape(_browse_key(order_by, page + 1))}">Next</a>'
    return f"""<!doctype html><html lang="en"><head><meta charset="utf-8">
<title>Food database — sorted by {html.escape(facet_label)} — Eat This Much</title>
<meta name="viewport" content="width=device-width">
<link rel="stylesheet" href="/static/clone/boundary.css"></head>
<body class="offline-boundary"><main>
<h1>Food database</h1>
<p class="target">Sorted by <code>{html.escape(facet_label)}</code> ·
page {page} · {total} foods in this offline archive</p>
<ul class="food-list">
{items}
</ul>
<nav class="pager">{prev_link} {next_link}</nav>
<p><a href="/food/browse">Reset sort</a> · <a href="/">Eat This Much home</a></p>
</main></body></html>""".encode("utf-8")


# ------------------------------------------------------------------ 页面层

def _stored_page(path: str) -> Response | None:
    record = store.page_record(path)
    if record is None:
        return None
    return html_response(store.page_bytes(record), record.get("status", 200))


def _canonical_food_path(path: str) -> str | None:
    """按 id 查规范地址；查不到就交回 None，让后面的 404 逻辑接手。"""

    tail = path[len("/calories/"):]
    match = _SLUG_ID.match(tail)
    if match:
        food_id = match.group("id")
        by_page = store.calories_path_by_id(food_id)
        if by_page:
            return by_page
        summary = store.food_summary(food_id)
        if summary:
            return summary["path"]
        # 地址尾号未必是这条食物自己的 id。源站 API 给的 canonical_url 里
        # 有 14 条尾号对不上：食物 2094（Red potato，slug `red-potato,2094`）
        # 的 canonical_url 是 `/calories/russet-potatoes-2092`，2092 这个 id
        # 在库里根本不存在。同类还有 1301 -> /calories/apples-1300、
        # 15 -> /calories/cottage-cheese-16 等。源站对这些地址答 200
        # （那本来就是它自己声明的规范地址），只按尾号查就会全判 404。
        # 所以按 id 查空之后，再拿整条 tail 当 slug 查一次。
        summary = store.food_by_slug(tail)
        return summary["path"] if summary else None
    if tail.isdigit():
        return store.calories_path_by_id(tail)
    summary = store.food_by_slug(tail)
    return summary["path"] if summary else None


@app.get("/")
def home() -> Response:
    record = store.page_record("/")
    if record is None:
        return _bare_404()
    body = store.page_bytes(record)
    runtime = b'<script src="/static/clone/home-actions.js?v=2" defer></script>'
    if runtime not in body:
        body = body.replace(b"</body>", runtime + b"</body>", 1)
    return html_response(body, record.get("status", 200))


@app.get("/{full_path:path}")
def catch_all(full_path: str, request: Request) -> Response:
    raw = "/" + full_path
    path = store.normalize(raw)

    # 先试 /app 那棵。两棵的文件名不会撞（哈希各自独立），所以取不到就回落
    # 到前台那棵是安全的——回落只可能命中同名文件，而同名文件不存在。
    app_immutable = _APP_IMMUTABLE.match(path)
    if app_immutable:
        response = _serve_static(f"app/_app/immutable/{app_immutable.group('rest')}")
        if response.status_code == 200:
            return response
    immutable = _IMMUTABLE.search(path)
    if immutable:
        rest = immutable.group("rest")
        response = _serve_static(f"_app/immutable/{rest}")
        if response.status_code == 200:
            return response
        return _serve_static(f"app/_app/immutable/{rest}")

    redirect = store.redirect_for(path)
    if redirect:
        return RedirectResponse(redirect["to"], status_code=redirect.get("status", 301))

    # 尾斜杠的规范形态是**逐页**的，不是逐站的，所以照着构建期从抓取证据里
    # 留下来的 record["canonical"] 走，而不是按前缀猜。实测四条：
    #
    #   /about/                     → 308 → /about                      （去斜杠）
    #   /diet-plan/keto/            → 308 → /diet-plan/keto             （去斜杠）
    #   /sample-email               → 301 → /sample-email/              （加斜杠）
    #   /diet-plan/atkins-ketogenic → 301 → /diet-plan/atkins-ketogenic/（加斜杠）
    #
    # 加斜杠是 301（Django 的 APPEND_SLASH），去斜杠是 308，两个方向的状态码不同。
    canonical = (store.page_record(path) or {}).get("canonical")
    if canonical:
        if raw != canonical:
            return RedirectResponse(canonical, status_code=301)
    elif raw != path and raw.endswith("/"):
        # 只对确实存在的目标发 308，否则一个不存在的路径会被 308 到另一个
        # 不存在的路径，把 404 藏起来。
        if store.page_record(path) or store.alias_target(path):
            return RedirectResponse(path, status_code=308)

    alias = store.alias_target(path)
    if alias:
        response = _stored_page(alias)
        if response is not None:
            return response

    response = _stored_page(path)
    if response is not None:
        return response

    # /calories/<slug>-<id>：数字是权威的，slug 是装饰性的。
    #
    # 但实测下来源站**不重定向**：/calories/zzz-banana-oatmeal-33511 直接答 200
    # （74024B，规范地址是 74018B），/calories/33511 也答 200。
    # 我原本按 goodreads 的经验假定它会 301 回规范地址——测下来是反的。
    # 克隆照实测来：按 id 找到那一页，原样交出去，不发重定向。
    if path.startswith("/calories/"):
        canonical = _canonical_food_path(path)
        if canonical:
            response = _stored_page(canonical)
            if response is not None:
                return response
            # 认得这条食物、但没有存档整页 —— 交客户端渲染的那张壳。
            #
            # 这一支覆盖的量比看上去大：食物 2150 条，存档整页的只有 40 条。
            # 剩下 2110 条在 SPA 里点进去都好好的（客户端路由自己跑 load），
            # 但**直接 goto 全是 404**——随机抽 30 条直接 GET，30 条全 404，
            # 交出去的是 "Server error - Eat This Much" 那张 404 壳。
            # 冷启动、开新标签页、按刷新，这 2110 页全是死的。
            #
            # 壳里是源站自己的 bundle 加两参启动（tools/build_clone.py:
            # install_food_shell 里记了为什么可以去掉水合负载），数据来自这边
            # 已经实测出形状的 /api/v1/food/<id>/ 那几条。所以这不是拿一张占位
            # 页糊住 404：渲染出来的就是这条食物本身的页面。
            #
            # 状态码 200 而不是 404：源站对这些地址答的就是 200。
            shell = store.shell("food-shell")
            if shell is not None:
                return html_response(shell, 200)

    # 博客是源站自己的第二个第一方源，它的静态资源挂在 /blog/ 前缀下
    if path.startswith("/blog/"):
        blog_asset = _serve_static(
            "blog-assets" + path[len("/blog"):], request.url.query
        )
        if blog_asset.status_code == 200:
            return blog_asset

    # 博客列表的分页收边。
    #
    # 源站的分页链接是真的：/blog/category/meal-planning/ 底部直接链到 page/2 3 4，
    # /blog/latest-articles/ 链到 page/2 3 7。前两页整页存档（范围内），
    # 第三页起收边——但**收边不等于 404**。答 404 就是在克隆里留死链，
    # 而这些链接在存档下来的标记里明明白白存在，点下去必须落到某处。
    # 和 /food/browse 用同一套 _fence_document，边界只有一种表达方式。
    m = _BLOG_PAGE.match(path)
    if m:
        base, page = f"/blog/{m.group(1)}", int(m.group(2))
        if store.page_record(base) is not None and page > BLOG_PAGE_LIMIT:
            return html_response(_fence_document(
                f"Page {page} is past the edge of this clone",
                "This offline clone carries the first "
                f"{BLOG_PAGE_LIMIT} pages of every blog list in full, with every "
                "post on them reachable. Beyond that the archive stops here "
                "rather than pretending.",
                base + "/",
                "Back to this blog list",
            ), 200)

    # 页面里指向源站根路径的散装静态文件（favicon、static_files/… ）
    www_asset = _serve_static(f"www{path}", request.url.query)
    if www_asset.status_code == 200:
        return www_asset

    if path == "/app" or path.startswith("/app/"):
        # /app 是纯客户端渲染：实测 /app/login 与 /app/<不存在的路径> 拿到的
        # 是**同一份 14586 字节的壳**，路由、登录判断、404 文案全在浏览器里跑。
        # 所以克隆对 /app 下的每一条路径都交这一份壳、都答 200——
        # 这不是「兜底」，这就是源站服务端的完整行为。
        shell = store.shell("app-shell") or store.shell("app-not-found")
        if shell is not None:
            return html_response(shell, 200)

    not_found = store.shell("not-found")
    if not_found is not None:
        return html_response(not_found, 404)
    return _bare_404()


# ------------------------------------------------------------------ 进程入口

def main() -> None:
    """引擎起候选站的第一顺位是直接执行本文件，端口从 ``PORT`` 读。"""

    import uvicorn

    uvicorn.run(
        app,
        host=os.environ.get("HOST", "127.0.0.1"),
        port=int(os.environ.get("PORT", "9060")),
        log_level=os.environ.get("LOG_LEVEL", "warning"),
    )


if __name__ == "__main__":
    main()