"""配置 API(Phase 2 Task 6):/api/platform/tenants/{slug}/config* 与
/api/platform/settings。

能力面(校验管线见 config_validation.py):
- GET  /config:当前生效快照(MAX 版本)+ version。返回**原样快照**——
  DEFAULT_CONFIG 不入版本(出厂模板演进不被旧版本锁死,spec E4),消费侧
  (registry → TenantConfig.from_snapshot)深合并;
- PUT  /config/{group}:校验 → 读当前快照 → **整组替换** → write_config_version
  (MAX+1)→ registry_reload 热生效。updated_by 取认证主体(super#id /
  tenant#id),comment 走查询参数(可选);
- POST /config/{group}/reset:重置出厂 = 代码库当前模板(spec §5.6,随平台
  升级演进)——按 Tenant.profile 取 _profile_snapshot 的对应组,档案缺的组
  取 DEFAULT_CONFIG 整组;
- GET  /config/versions(列表:版本/时间/作者/备注,不含 config 本体)与
  /config/versions/{n}(详情含整份);
- POST /config/rollback {version}:目标版本复制为新版本(历史不可变),
  reload 生效;
- POST /wall/test(试金石):body 可带 wall 覆盖(先 compile_wall 校验)或
  缺省用当前墙——逐句调 boundary_filter 纯函数给判定,**不落库不 bump 版本**
  (reset/编辑器的预览入口)。判定优先级与 conversation.py 执行侧一致:
  价格墙 → 零号码墙 → 再索要墙(仅 has_contact);
- POST /email/test 与 /push/test(凭据测试,Phase 3 Task 7c):分别用
  resolve_email_settings/resolve_push_settings 的当前配置真发测试邮件 /
  探测推送连通性——**push 探测绝不携带线索数据**(空 messages 批量),
  两端点不落库不 bump 版本,成败如实返回(400 只用于"未配置"预检);
- GET/PUT /api/platform/settings:PlatformSetting CRUD,仅超管。value 以
  JSON Text 直存(读回还原类型);PUT 提交后 settings_store.refresh 热刷新
  进程内存快照——resolver 的平台默认回退链(Phase 4 Task 5A 接线,键名
  ai.*/smtp.* 对齐 admin 平台设置页)即时生效,无需重启。

鉴权矩阵(spec §3):config 系 = require_tenant(slug)(租户全开——本租户
管理员可自助改配置);settings = require_super。409 门经 platform_user 连锁。

密钥掩码哨兵(Phase 3 Task 1):push.api_key / ai.api_key /
email.smtp.password 及平台设置的密钥名值,所有携带 config/value 的响应
一律掩码为 "__SET__"(原值非空;空串/None 原样——前端能区分"配了"与
"没配");PUT 收到 "__SET__" 还原为库值再写版本(前端"不改就原样传回"
的往返契约)。库行/版本历史永远存原值——掩码只作用响应层。

版本写入一律走 db.write_config_version(与 Task 5 创建向导同一 MAX+1 路径)。
"""
import copy
import json
import socket

import httpx
from fastapi import APIRouter, Depends, HTTPException, Request
from sqlalchemy import func, select
from sqlalchemy.ext.asyncio import AsyncSession

from app.engine.services import boundary_filter
from app.engine.services.email_service import send_test_email
from app.engine.wall_schema import WallConfigError, compile_wall
from app.platform.auth import UserContext, require_super
from app.platform.config_validation import (
    CONFIG_GROUPS,
    ValidationContext,
    validate_group,
)
from app.platform.config_views import (
    resolve_email_settings,
    resolve_push_settings,
)
from app.platform.db import (
    PlatformSetting,
    Tenant,
    TenantConfigVersion,
    other_push_prefixes,
    write_config_version,
)
from app.platform.defaults import DEFAULT_CONFIG
from app.platform.routes.tenant_routes import _get_tenant_or_404, _tenant_guard
from app.platform import settings_store
from app.platform.tenant_source import _profile_snapshot

router = APIRouter(prefix="/api/platform/tenants", tags=["platform-config"])
settings_router = APIRouter(
    prefix="/api/platform/settings", tags=["platform-settings"])


# ---- 助手 -----------------------------------------------------------------------


async def _json_body(request: Request) -> dict:
    """手动解析 JSON 对象请求体:非 JSON/非对象一律 400(带实际类型),
    不让 FastAPI 的 422 抢答——配置 API 的错误契约是"400 带字段路径"。"""
    try:
        body = await request.json()
    except ValueError as exc:
        raise HTTPException(status_code=400,
                            detail="请求体必须是合法 JSON 对象") from exc
    if not isinstance(body, dict):
        raise HTTPException(
            status_code=400,
            detail=f"请求体必须是 JSON 对象(实际 {type(body).__name__})")
    return body


async def _current_version_row(
        session: AsyncSession, tenant_id: int) -> TenantConfigVersion | None:
    """当前生效版本行(= MAX(version),db.py 纪律)。"""
    return (await session.execute(
        select(TenantConfigVersion)
        .where(TenantConfigVersion.tenant_id == tenant_id)
        .order_by(TenantConfigVersion.version.desc())
        .limit(1))).scalar_one_or_none()


async def _load_current(
        session: AsyncSession, tenant_id: int, slug: str
) -> tuple[TenantConfigVersion, dict]:
    """当前生效版本行 + 解析后的快照。无版本(防御——创建向导必写版本 1)
    → 404;坏 JSON(库层数据损坏)→ 500 显性报,不静默。"""
    row = await _current_version_row(session, tenant_id)
    if row is None:
        raise HTTPException(
            status_code=404, detail=f"租户 {slug!r} 没有任何配置版本")
    try:
        snapshot = json.loads(row.config_json)
    except ValueError as exc:
        raise HTTPException(
            status_code=500,
            detail=f"租户 {slug!r} 版本 {row.version} 的 config_json 损坏"
        ) from exc
    return row, snapshot


def _updated_by(user: UserContext) -> str:
    return f"{user.role}#{user.user_id}"


# ---- 密钥掩码 / __SET__ 哨兵(Phase 3 Task 1) --------------------------------------

MASKED = "__SET__"

# 租户配置密钥字段清单(组 → 组内路径元组;多元素元组 = 嵌套键)。响应一律
# 掩码;PUT 收到 MASKED 值还原为当前快照原值——前端"不改就原样传回"的往返
# 契约。语义:原值非空 → MASKED;空串/None/缺键原样(前端能区分"配了"与
# "没配")。空串传回仍 = 清空(既有语义不因掩码改变)。
_SECRET_PATHS: dict[str, tuple[tuple[str, ...], ...]] = {
    "push": (("api_key",),),
    "ai": (("api_key",),),
    "email": (("smtp", "password"),),
}


def _dig(container, path: tuple[str, ...]):
    """按路径取嵌套 dict 值;任一层不是 dict → None。"""
    node = container
    for key in path:
        node = node.get(key) if isinstance(node, dict) else None
    return node


def _mask_group(group: str, value):
    """单组掩码视图(深拷贝):密钥路径上非空字符串 → MASKED,空串/None/
    缺键原样。非 dict 组值原样深拷贝返回。"""
    out = copy.deepcopy(value)
    if not isinstance(out, dict):
        return out
    for path in _SECRET_PATHS.get(group, ()):
        leaf = _dig(out, path)
        if isinstance(leaf, str) and leaf:
            node = _dig(out, path[:-1])
            node[path[-1]] = MASKED
    return out


def _mask_snapshot(snapshot: dict) -> dict:
    """整份快照的掩码视图(逐组 _mask_group)。"""
    return {group: _mask_group(group, value)
            for group, value in snapshot.items()}


def _restore_sentinels(group: str, body: dict, current: dict) -> dict:
    """PUT 哨兵还原:body 密钥路径上值恰为 MASKED → 替换为当前快照同路径
    原值(无库存 → None,保持"未设置"——哨兵字面量绝不落库)。返回处理后
    的深拷贝,不改入参;非密钥路径与传新值/空串的路径一律原样。"""
    out = copy.deepcopy(body)
    for path in _SECRET_PATHS.get(group, ()):
        if _dig(out, path) == MASKED:
            node = _dig(out, path[:-1])
            node[path[-1]] = _dig(current.get(group), path)
    return out


# 平台设置密钥判定:key 名(不区分大小写)含以下片段即视为密钥。适用设置
# 项自身的 key(标量密钥,如 glm_api_key = "sk-...")与 value 的嵌套 dict
# 递归两层。
_SETTING_SECRET_MARKERS = ("key", "password", "secret")


def _is_secret_setting_key(name: str) -> bool:
    lowered = name.lower() if isinstance(name, str) else ""
    return any(marker in lowered for marker in _SETTING_SECRET_MARKERS)


def _mask_setting_value(value):
    """递归掩码:密钥名下的非空字符串值 → MASKED;dict/list 递归,其余
    标量原样。"""
    if isinstance(value, dict):
        return {
            k: (MASKED if _is_secret_setting_key(k)
                and isinstance(v, str) and v else _mask_setting_value(v))
            for k, v in value.items()}
    if isinstance(value, list):
        return [_mask_setting_value(v) for v in value]
    return value


def _mask_setting_item(key: str, value):
    """单个设置项的掩码视图:设置 key 本身命中密钥名且值为非空字符串 →
    掩码;否则递归掩码 value 内部。"""
    if _is_secret_setting_key(key) and isinstance(value, str) and value:
        return MASKED
    return _mask_setting_value(value)


def _restore_setting_sentinels(value, stored):
    """value 中密钥位置的 MASKED → stored 同路径值(递归结构与
    _mask_setting_value 对齐;stored 无该路径 → None)。不改入参。"""
    if isinstance(value, dict):
        src = stored if isinstance(stored, dict) else {}
        return {
            k: (copy.deepcopy(src.get(k))
                if _is_secret_setting_key(k) and v == MASKED
                else _restore_setting_sentinels(v, src.get(k)))
            for k, v in value.items()}
    if isinstance(value, list):
        src = stored if isinstance(stored, list) else []
        return [_restore_setting_sentinels(
            v, src[i] if i < len(src) else None)
            for i, v in enumerate(value)]
    return value


# ---- 配置快照 / 分组编辑 ----------------------------------------------------------


@router.get("/{slug}/config")
async def get_config(slug: str, request: Request,
                     user=Depends(_tenant_guard)):
    """当前生效快照(MAX 版本)+ version。原样快照,非合并视图——缺省键
    由消费侧(registry)深合并 DEFAULT_CONFIG。密钥字段掩码(Phase 3
    Task 1):非空 → MASKED,空串/None 原样。"""
    engine = request.app.state.platform_engine
    async with AsyncSession(engine, expire_on_commit=False) as session:
        tenant = await _get_tenant_or_404(session, slug)
        row, snapshot = await _load_current(session, tenant.id, slug)
    return {"slug": slug, "version": row.version,
            "config": _mask_snapshot(snapshot)}


@router.put("/{slug}/config/{group}")
async def put_config_group(
        slug: str, group: str, request: Request, comment: str | None = None,
        user=Depends(_tenant_guard)):
    """分组编辑:校验(config_validation 管线)→ 整组替换当前快照该组 →
    MAX+1 写新版本 → registry_reload 热生效。快照存用户配置**原样组**
    (组内缺省键消费侧深合并出厂默认补)。

    密钥哨兵(Phase 3 Task 1):密钥字段传 MASKED = 保持库值(校验按
    字符串过,还原发生在校验后写入前);传新值 → 覆盖;空串传回 = 清空
    (既有语义不因掩码改变)。响应的密钥字段同样掩码——哨兵还原后的原值
    不经响应回显。"""
    body = await _json_body(request)
    engine = request.app.state.platform_engine
    async with AsyncSession(engine, expire_on_commit=False) as session:
        tenant = await _get_tenant_or_404(session, slug)
        context = ValidationContext(
            other_prefixes=await other_push_prefixes(session, tenant.id))
        errors = validate_group(group, body, context)
        if errors:
            raise HTTPException(status_code=400, detail="; ".join(errors))
        _, current = await _load_current(session, tenant.id, slug)
        body = _restore_sentinels(group, body, current)
        new_snapshot = dict(current)
        new_snapshot[group] = copy.deepcopy(body)
        version = await write_config_version(
            session, tenant.id, new_snapshot,
            updated_by=_updated_by(user), comment=comment)
        await session.commit()

    await request.app.state.registry.registry_reload(slug)
    return {"slug": slug, "group": group, "version": version,
            "config": _mask_group(group, new_snapshot[group])}


@router.post("/{slug}/config/{group}/reset")
async def reset_config_group(
        slug: str, group: str, request: Request, user=Depends(_tenant_guard)):
    """重置出厂(spec §5.6 = 代码库当前模板,非创建时的版本 1 快照):
    按租户创建 profile 取 _profile_snapshot 对应组;档案快照缺的组
    (contact/misc/ai)取 DEFAULT_CONFIG 整组。产新版本 + reload。"""
    if group not in CONFIG_GROUPS:
        raise HTTPException(
            status_code=400,
            detail=f"未知配置组: {group!r}(合法: "
                   f"{', '.join(sorted(CONFIG_GROUPS))})")
    engine = request.app.state.platform_engine
    async with AsyncSession(engine, expire_on_commit=False) as session:
        tenant = await _get_tenant_or_404(session, slug)
        try:
            factory = _profile_snapshot(tenant.profile)
        except LookupError as exc:
            raise HTTPException(
                status_code=400, detail=f"出厂档案缺失: {exc}") from exc
        if group in factory:
            value = copy.deepcopy(factory[group])
        else:
            value = copy.deepcopy(DEFAULT_CONFIG[group])
        # push 组重置补跨租户查重(终审 I-3):重置回出厂 prefix 可能撞上
        # 现在的占用方(本租户改过前缀后,出厂前缀被别人取走)。
        if group == "push" and isinstance(value, dict):
            prefix = value.get("prefix")
            if (isinstance(prefix, str) and prefix and prefix
                    in await other_push_prefixes(session, tenant.id)):
                raise HTTPException(
                    status_code=400,
                    detail=f"重置后的 push.prefix {prefix!r} 已被其他租户"
                           f"占用——请改用 PUT /config/push 指定其他前缀")
        _, current = await _load_current(session, tenant.id, slug)
        new_snapshot = dict(current)
        new_snapshot[group] = value
        version = await write_config_version(
            session, tenant.id, new_snapshot,
            updated_by=_updated_by(user),
            comment=f"重置出厂: {group}")
        await session.commit()

    await request.app.state.registry.registry_reload(slug)
    return {"slug": slug, "group": group, "version": version,
            "config": _mask_group(group, value)}


# ---- 版本历史 / 回滚 ---------------------------------------------------------------


@router.get("/{slug}/config/versions")
async def list_config_versions(
        slug: str, request: Request, user=Depends(_tenant_guard)):
    """版本列表(升序):版本/时间/作者/备注——不含 config_json 本体
    (列表几十 KB × N 版本会白白撑爆响应)。"""
    engine = request.app.state.platform_engine
    async with AsyncSession(engine, expire_on_commit=False) as session:
        tenant = await _get_tenant_or_404(session, slug)
        rows = (await session.execute(
            select(TenantConfigVersion)
            .where(TenantConfigVersion.tenant_id == tenant.id)
            .order_by(TenantConfigVersion.version))).scalars().all()
    return {"slug": slug, "items": [{
        "version": row.version,
        "created_at": row.created_at.isoformat(),
        "updated_by": row.updated_by,
        "comment": row.comment,
    } for row in rows]}


@router.get("/{slug}/config/versions/{version}")
async def get_config_version(
        slug: str, version: int, request: Request, user=Depends(_tenant_guard)):
    """单版本详情(含整份 config)。不存在 → 404。config 掩码视图
    (Phase 3 Task 1)——历史行本身永远存原值。"""
    engine = request.app.state.platform_engine
    async with AsyncSession(engine, expire_on_commit=False) as session:
        tenant = await _get_tenant_or_404(session, slug)
        row = (await session.execute(
            select(TenantConfigVersion)
            .where(TenantConfigVersion.tenant_id == tenant.id,
                   TenantConfigVersion.version == version)
        )).scalar_one_or_none()
        if row is None:
            raise HTTPException(
                status_code=404, detail=f"版本不存在: {version}")
    return {
        "slug": slug, "version": row.version,
        "created_at": row.created_at.isoformat(),
        "updated_by": row.updated_by, "comment": row.comment,
        "config": _mask_snapshot(json.loads(row.config_json)),
    }


@router.post("/{slug}/config/rollback")
async def rollback_config(
        slug: str, request: Request, user=Depends(_tenant_guard)):
    """回滚:目标版本整份复制为新版本(历史不可变——旧版本行永不改写),
    reload 生效。落库原值;响应为掩码视图(Phase 3 Task 1)。"""
    body = await _json_body(request)
    target = body.get("version")
    if not isinstance(target, int) or isinstance(target, bool) or target < 1:
        raise HTTPException(
            status_code=400, detail="version: 须为正整数(实际 "
                                    f"{target!r})")
    engine = request.app.state.platform_engine
    async with AsyncSession(engine, expire_on_commit=False) as session:
        tenant = await _get_tenant_or_404(session, slug)
        row = (await session.execute(
            select(TenantConfigVersion)
            .where(TenantConfigVersion.tenant_id == tenant.id,
                   TenantConfigVersion.version == target)
        )).scalar_one_or_none()
        if row is None:
            raise HTTPException(
                status_code=404, detail=f"版本不存在: {target}")
        snapshot = json.loads(row.config_json)
        new_version = await write_config_version(
            session, tenant.id, snapshot,
            updated_by=_updated_by(user),
            comment=f"回滚自版本 {target}")
        await session.commit()

    await request.app.state.registry.registry_reload(slug)
    return {"slug": slug, "rollback_to": target, "version": new_version,
            "config": _mask_snapshot(snapshot)}


# ---- 试金石(wall/test) -----------------------------------------------------------


_WALL_TEST_KEYS = frozenset({"sentences", "wall", "has_contact", "source"})


def _judge_sentence(sentence: str, wall, *, has_contact: bool,
                    source: str) -> dict:
    """单句判定——优先级与 conversation.py 执行侧逐句门控一致:
    价格墙(掐断+替换)→ 零号码墙(替换)→ 再索要墙(仅已留资,静默丢弃)。
    替换话术同款取自墙词表:deflection_for(首句形态,emitted 为空的分支)/
    no_contact 按 has_contact·source 分支 / 再索要无替换(丢句不掐断)。"""
    if boundary_filter.violates_boundary(sentence, wall=wall):
        return {"sentence": sentence, "action": "blocked", "reason": "boundary",
                "replacement": boundary_filter.deflection_for(
                    sentence, has_contact=has_contact, wall=wall)}
    if boundary_filter.no_contact_value(sentence, wall=wall):
        replacement = (
            wall.no_contact["already"] if has_contact
            else wall.no_contact["app"] if source == "app"
            else wall.no_contact["web"])
        return {"sentence": sentence, "action": "replaced",
                "reason": "no_contact", "replacement": replacement}
    if has_contact and boundary_filter.asks_contact(sentence, wall=wall):
        return {"sentence": sentence, "action": "blocked", "reason": "reask",
                "replacement": None}
    return {"sentence": sentence, "action": "pass", "reason": None,
            "replacement": None}


@router.post("/{slug}/wall/test")
async def test_wall(slug: str, request: Request, user=Depends(_tenant_guard)):
    """试金石:逐句墙判定预览。body:
    - sentences: 非空字符串列表(必填);
    - wall: 覆盖墙(先 compile_wall 校验,坏墙 400 带字段路径)——缺省用
      当前生效墙(reset/编辑器改墙前的预览入口);
    - has_contact: 客户已留联系方式(默认 False——启用再索要墙/换话术池);
    - source: "web" | "app"(默认 web——零号码墙替换句分支)。
    纯内存判定:不落库、不 bump 版本、不 reload。"""
    body = await _json_body(request)
    unknown = set(body) - _WALL_TEST_KEYS
    if unknown:
        raise HTTPException(
            status_code=400,
            detail=f"未知字段: {', '.join(sorted(unknown))}(合法: "
                   f"{', '.join(sorted(_WALL_TEST_KEYS))})")
    sentences = body.get("sentences")
    if not isinstance(sentences, list) or not sentences:
        raise HTTPException(status_code=400,
                            detail="sentences: 须为非空字符串列表")
    for i, sentence in enumerate(sentences):
        if not isinstance(sentence, str):
            raise HTTPException(
                status_code=400,
                detail=f"sentences[{i}]: 项须为字符串(实际 "
                       f"{type(sentence).__name__})")
    has_contact = body.get("has_contact", False)
    if not isinstance(has_contact, bool):
        raise HTTPException(
            status_code=400,
            detail=f"has_contact: 须为布尔(实际 {type(has_contact).__name__})")
    source = body.get("source", "web")
    if source not in ("web", "app"):
        raise HTTPException(
            status_code=400, detail=f"source: 只允许 web/app(实际 {source!r})")

    engine = request.app.state.platform_engine
    wall_override = body.get("wall")
    async with AsyncSession(engine, expire_on_commit=False) as session:
        tenant = await _get_tenant_or_404(session, slug)
        if wall_override is not None:
            wall_source = "override"
            candidate = wall_override
        else:
            wall_source = "current"
            _, snapshot = await _load_current(session, tenant.id, slug)
            candidate = snapshot.get("wall")
    try:
        compiled = compile_wall(copy.deepcopy(candidate))
    except WallConfigError as exc:
        raise HTTPException(status_code=400, detail=str(exc)) from exc

    results = [_judge_sentence(s, compiled, has_contact=has_contact,
                               source=source) for s in sentences]
    return {"slug": slug, "wall_source": wall_source, "results": results}


# ---- 凭据测试端点(email/push test,Phase 3 Task 7c) -------------------------------

_EMAIL_TEST_KEYS = frozenset({"to"})


@router.post("/{slug}/email/test")
async def test_email(slug: str, request: Request,
                     user=Depends(_tenant_guard)):
    """SMTP 测试邮件: 用当前生效邮件配置(resolve_email_settings,租户组
    优先/空槽回退 env SMTP_*)真发一封到 body.to——主题/正文契约见
    email_service.send_test_email。SMTP 未配置(回退后 host/user 仍空)
    → 400;发送失败不 5xx,{sent: false, error} 如实返回。不落库不 bump
    版本;密钥绝不进响应。"""
    body = await _json_body(request)
    unknown = set(body) - _EMAIL_TEST_KEYS
    if unknown:
        raise HTTPException(
            status_code=400,
            detail=f"未知字段: {', '.join(sorted(unknown))}(合法: to)")
    to = body.get("to")
    if not isinstance(to, str) or "@" not in to.strip():
        raise HTTPException(
            status_code=400,
            detail=f"to: 须为含 @ 的收件人邮箱(实际 {to!r})")

    engine = request.app.state.platform_engine
    async with AsyncSession(engine, expire_on_commit=False) as session:
        tenant = await _get_tenant_or_404(session, slug)
        _, snapshot = await _load_current(session, tenant.id, slug)
        cfg = resolve_email_settings(snapshot)
    if not cfg["host"] or not cfg["user"]:
        raise HTTPException(
            status_code=400,
            detail="SMTP 未配置(服务器/账号在租户配置与环境回退后均为空)"
                   "——请先在「配置中心 → 凭据」保存邮件 SMTP")
    sent, error = await send_test_email(to.strip(), tenant.name, snapshot)
    return {"slug": slug, "sent": sent, "error": error}


def _transport_reason(exc: Exception) -> str:
    """传输异常 → 不可达原因分类(前端三态展示): dns(域名解析失败)/
    timeout(TimeoutException 族)/connect(拒绝·不可达·TLS 等其余)。

    dns 判定双通道: 沿 __cause__/__context__ 链找 gaierror(httpx 把解析
    错误包在 ConnectError 里),并对链上异常做文案匹配——Windows 实测
    (冒烟 Task 7c)httpx/anyio 会把 errno 11001 包成裸 ConnectError,
    cause 链不带 gaierror,只能从 "[Errno 11001] getaddrinfo failed"
    文案识别;分类仅供修复提示,错误原文始终随响应返回兜底。"""
    node: BaseException | None = exc
    while node is not None:
        if isinstance(node, socket.gaierror):
            return "dns"
        text = str(node).lower()
        if "getaddrinfo" in text or "name or service not known" in text:
            return "dns"
        node = node.__cause__ or node.__context__
    if isinstance(exc, httpx.TimeoutException):
        return "timeout"
    return "connect"


async def _probe_push(cfg: dict) -> dict:
    """单次连通性探测(无重试): 与 lead_push_service._do_post 同款连接形态
    (timeout/follow_redirects/X-Api-Key 头),body 恒为空 messages 列表——
    **绝不携带任何线索数据**(UniService 是批量结构,空批量对方案应为
    无操作;契约文档不在库内,这是可用的最保守预检形态)。"""
    try:
        async with httpx.AsyncClient(timeout=cfg["timeout"],
                                     follow_redirects=True) as client:
            resp = await client.post(
                cfg["url"], json={"messages": []},
                headers={"X-Api-Key": cfg["api_key"]})
    except httpx.HTTPError as exc:
        return {"reachable": False, "auth_ok": None, "status": None,
                "reason": _transport_reason(exc),
                "error": str(exc) or repr(exc)}
    auth_ok = (True if resp.status_code < 300
               else False if resp.status_code in (401, 403)
               else None)
    return {"reachable": True, "auth_ok": auth_ok,
            "status": resp.status_code, "reason": None, "error": None}


@router.post("/{slug}/push/test")
async def test_push(slug: str, request: Request,
                    user=Depends(_tenant_guard)):
    """推送连通性探测: 只验 URL 可达 + 鉴权通过,不发真数据(空 messages
    批量,见 _probe_push)。URL 回退后仍空 → 400;其余如实返回——不可达
    (含 dns/timeout/connect 原因分类)/可达但鉴权失败(401/403)/正常(2xx);
    其余状态码可达但鉴权不定(auth_ok=null)。不落库不 bump 版本。"""
    engine = request.app.state.platform_engine
    async with AsyncSession(engine, expire_on_commit=False) as session:
        tenant = await _get_tenant_or_404(session, slug)
        _, snapshot = await _load_current(session, tenant.id, slug)
    cfg = resolve_push_settings(snapshot)
    if not cfg["url"]:
        raise HTTPException(
            status_code=400,
            detail="推送 URL 未配置(租户配置与环境回退后均为空)"
                   "——请先在「配置中心 → 凭据」保存推送 URL")
    return {"slug": slug, **await _probe_push(cfg)}


# ---- 平台设置(仅超管;Phase 4 Task 5A 起 resolver 回退链已接线) ---------------------


def _decode_setting(raw: str):
    """Text 列还原类型:json.loads 失败(手工 SQL 塞的裸文本)回退原串。"""
    try:
        return json.loads(raw)
    except ValueError:
        return raw


@settings_router.get("")
async def list_settings(request: Request, user=Depends(require_super)):
    """平台级默认(集团 AI 凭据/默认 SMTP 等,spec §5.2)。值掩码视图
    (Phase 3 Task 1):key 名含 key/password/secret 的非空字符串值 →
    MASKED(设置 key 本身与嵌套 dict 递归都算);库行永远存原值。"""
    engine = request.app.state.platform_engine
    async with AsyncSession(engine, expire_on_commit=False) as session:
        rows = (await session.execute(
            select(PlatformSetting).order_by(PlatformSetting.key))
        ).scalars().all()
    return {"items": [{"key": row.key,
                       "value": _mask_setting_item(
                           row.key, _decode_setting(row.value))}
                      for row in rows]}


@settings_router.put("")
async def put_setting(request: Request, user=Depends(require_super)):
    """upsert 单个设置项:key 1-64 字符;value 任意 JSON(json.dumps 入
    Text,读回还原)。同 key 再写 = 整值替换。提交后 settings_store.refresh
    热刷新内存快照——resolver 的平台默认回退链即时生效(Phase 4 Task 5A)。

    密钥哨兵(Phase 3 Task 1):key 命中密钥名且值恰为 MASKED,或嵌套
    dict 内密钥位置为 MASKED → 还原为现存同路径值(无库存 → None)。
    非密钥位置的 MASKED 字面量 = 普通字符串原样落库。响应掩码。"""
    body = await _json_body(request)
    key = body.get("key")
    if not isinstance(key, str) or not 1 <= len(key) <= 64:
        raise HTTPException(
            status_code=400, detail="key: 须为 1-64 字符字符串")
    if "value" not in body:
        raise HTTPException(status_code=400, detail="value: 缺少(必填)")

    engine = request.app.state.platform_engine
    async with AsyncSession(engine, expire_on_commit=False) as session:
        row = (await session.execute(
            select(PlatformSetting).where(PlatformSetting.key == key)
        )).scalar_one_or_none()
        stored = _decode_setting(row.value) if row is not None else None
        if _is_secret_setting_key(key) and body["value"] == MASKED:
            value = copy.deepcopy(stored)
        else:
            value = _restore_setting_sentinels(body["value"], stored)
        encoded = json.dumps(value, ensure_ascii=False)
        if row is None:
            session.add(PlatformSetting(key=key, value=encoded))
        else:
            row.value = encoded
        await session.commit()
    await settings_store.refresh(engine)
    return {"key": key, "value": _mask_setting_item(key, value)}