# Task 7: Host 中间件租户路由——纯 ASGI(http+websocket 双覆盖)。
#
# 本文件的存在意义(前序审查实证过的坑): 若中间件走了 BaseHTTPMiddleware
# (@app.middleware("http")),WS 请求会整个绕过租户解析落 get_runtime 兜底,
# auto 域名的 WS 流量静默写进 jiancai 库(串库不崩溃,极难发现)。
# test_ws_routes_to_correct_tenant_db 用双库断言钉死这条红线。

import json
import shutil

import pytest
from starlette.websockets import WebSocketDisconnect

from app.main import app
from app.platform.host_middleware import TenantHostMiddleware
from tests.conftest import (
    AUTO_HOST,
    JIANCAI_HOST,
    NOPE_HOST,
    SEED_DIR,
    app_test_client,
    build_app,
)


# ---- 中间件挂载顺序守护 -------------------------------------------------------


def test_tenant_middleware_is_outermost_user_middleware():
    # add_middleware 后加者居 user_middleware[0] = 最外层。租户解析必须
    # 先于一切用户中间件(里层中间件/路由才读得到 state.tenant)——未来
    # 新中间件若更晚 add_middleware 插到租户中间件外层,此测试即红。
    assert app.user_middleware[0].cls is TenantHostMiddleware


# ---- 平台级豁免 -------------------------------------------------------------


def test_health_served_for_any_host(app_client):
    # /health 在任何 Host 下可达(部署健康检查 curl 127.0.0.1:8018,
    # Host 是 IP:端口,对 registry 必然未知)
    assert app_client.get("/health").status_code == 200
    r = app_client.get("/health", headers={"host": NOPE_HOST})
    assert r.status_code == 200


def test_health_exemption_is_exact_match(app_client):
    # 精确 == "/health",/healthxxx 不豁免:未知 Host 由中间件(而非路由)
    # 拒绝——text/plain 的 PlainTextResponse 区别于路由 404 的 JSON body
    r = app_client.get("/healthxxx", headers={"host": NOPE_HOST})
    assert r.status_code == 404
    assert r.headers["content-type"].startswith("text/plain")


# ---- 未知 Host --------------------------------------------------------------


def test_unknown_host_gets_404(app_client):
    r = app_client.get("/api/chat/session", headers={"host": NOPE_HOST})
    assert r.status_code == 404


def test_unknown_host_ws_rejected_with_1008(app_client):
    # 探针实证: 服务器未 accept 直接 close 时,TestClient 在 __enter__ 即抛
    # WebSocketDisconnect,code/reason 保留——这就是断言方式
    with pytest.raises(WebSocketDisconnect) as ei:
        with app_client.websocket_connect("/ws/chat", headers={"host": NOPE_HOST}):
            pass  # pragma: no cover — 未 accept 即 close,进不来
    assert ei.value.code == 1008


# ---- 停用租户 ---------------------------------------------------------------


@pytest.fixture
def disabled_client(tmp_path):
    """jiancai 停用版 app_client: 拷 seed 到 tmp、改 status 再加载。

    加载前改盘(而非 registry_reload): 无需跨事件循环碰 registry 锁,
    最简;reload 语义本身已被 Task 5a 的测试钉过,此处不重复走。"""
    seed = tmp_path / "seed"
    shutil.copytree(SEED_DIR, seed)
    tenant_json = seed / "jiancai" / "tenant.json"
    data = json.loads(tenant_json.read_text(encoding="utf-8"))
    data["status"] = "disabled"
    tenant_json.write_text(json.dumps(data, ensure_ascii=False), encoding="utf-8")
    a = build_app(seed, tmp_path / "data")
    with app_test_client(a, f"http://{JIANCAI_HOST}", tmp_path) as c:
        yield c


def test_disabled_tenant_gets_pause_page(disabled_client):
    r = disabled_client.get("/api/chat/session")
    assert r.status_code == 503
    assert "暂停" in r.text
    # 中性页: 不暴露租户 slug/域名
    assert "jiancai" not in r.text.lower()
    assert JIANCAI_HOST not in r.text


def test_disabled_tenant_ws_rejected_with_1013(disabled_client):
    with pytest.raises(WebSocketDisconnect) as ei:
        with disabled_client.websocket_connect("/ws/chat"):
            pass  # pragma: no cover
    assert ei.value.code == 1013


# ---- 租户正确性(防串库红线) --------------------------------------------------


def test_default_host_routes_to_jiancai(app_client):
    # app_client 不带 host 头 → base_url 的 jiancai 域(既有全量测试的语义)
    r = app_client.post("/api/chat/session", json={})
    assert r.status_code == 200


def test_ws_routes_to_correct_tenant_db(app_client, tmp_path):
    """WS 经 auto 域名连接 → 会话必须落在 auto 租户库。

    三层断言:
    1. 文件级——此刻只碰过 auto(WS 用显式 host;lifespan 清扫因无 db
       文件而跳过),auto.db 已懒建而 jiancai.db 从未创建;
    2. REST resume 经 auto 域名命中同一 sid(is_new=False 且回原 sid);
    3. 同一 sid 经 jiancai 域名(base_url 默认)不可见——resume miss 落
       is_new=True(新建了另一个会话),证明 jiancai 库里没有它。
    (经 /api/chat/session 的 resume 探测而非 /messages: 后者只放行
    app-source 会话,WS 造的 standalone 会话两库都会 404,区分不了;
    resume 探测不触发 AI 调用。)"""
    with app_client.websocket_connect(
            "/ws/chat", headers={"host": AUTO_HOST}) as ws:
        ws.send_text(json.dumps({"source": "standalone"}))
        init = ws.receive_json()
        assert init["type"] == "init"
        sid = init["session_id"]

    # 1. 文件级(jiancai 还没被任何请求 resolve 过)
    assert (tmp_path / "auto.db").exists()
    assert not (tmp_path / "jiancai.db").exists()

    # 2. auto 库命中
    r_auto = app_client.post(
        "/api/chat/session", json={"session_id": sid},
        headers={"host": AUTO_HOST})
    assert r_auto.status_code == 200
    assert r_auto.json()["is_new"] is False
    assert r_auto.json()["session_id"] == sid

    # 3. jiancai 库没有(miss → 新建,is_new=True、sid 不同)
    r_jc = app_client.post("/api/chat/session", json={"session_id": sid})
    assert r_jc.status_code == 200
    assert r_jc.json()["is_new"] is True
    assert r_jc.json()["session_id"] != sid