"""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);
- GET/PUT /api/platform/settings:PlatformSetting CRUD,仅超管。本阶段只落
  存储与接口(value 以 JSON Text 直存,读回还原类型);resolver 的平台默认
  回退链接入归 Phase 3。

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。

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

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.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.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.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}"


# ---- 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。"""
    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": 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)。"""
    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)
        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": 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": 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。"""
    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": 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。"""
    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": 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}


# ---- 平台设置(仅超管;resolver 回退链接入归 Phase 3) -----------------------------


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)——本阶段只落
    存储与接口;消费(resolver 平台默认回退链)归 Phase 3。"""
    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": _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。"""
    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)")
    encoded = json.dumps(body["value"], ensure_ascii=False)

    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()
        if row is None:
            session.add(PlatformSetting(key=key, value=encoded))
        else:
            row.value = encoded
        await session.commit()
    return {"key": key, "value": body["value"]}