"""T-06 chat 最小闭环（会话/归属/SessionGuard/窗口/落盘）。

走 main app 真路由栈（audit+trace 中间件）；仓储注入 sqlite（含
agent_session/agent_message）；Redis 注入 FakeRedis（窗口读写可断言，
异常路径验证降级）；agent_service 走无 key 降级路径（不依赖外网）。
"""

from __future__ import annotations

import json

import pytest
from fastapi.testclient import TestClient
from sqlalchemy import text

from _ddl import create_sqlite_engine

from app.api import audit_middleware as audit_mod
from app.api import chat as chat_mod
from app.api import deps as deps_mod
from app.api import risk as risk_api
from app.main import app
from app.repository.core_ro import CoreReadOnlyRepository
from app.repository.risk_repository import RiskRepository
from app.repository.session_repository import SessionRepository
from app.service import memory_service
from app.service import tool_service
from app.service.auth_service import issue_dev_token as _issue  # noqa: F401
from app.service import auth_service
from app.service.risk import redis_gateway


class FakeRedis:
    """窗口语义：rpush/lrange/ltrim/expire 最小实现 + 可注入故障。"""

    def __init__(self):
        self.lists: dict[str, list[str]] = {}
        self.ttls: dict[str, int] = {}
        self.fail = False

    def _maybe_fail(self):
        if self.fail:
            raise ConnectionError("redis down")

    def rpush(self, key, *vals):
        self._maybe_fail()
        self.lists.setdefault(key, []).extend(vals)

    def lrange(self, key, start, end):
        self._maybe_fail()
        lst = self.lists.get(key, [])
        return lst[start:] if end == -1 else lst[start : end + 1]

    def ltrim(self, key, start, end):
        lst = self.lists.get(key, [])
        self.lists[key] = lst[start:] if end == -1 else lst[start : end + 1]

    def expire(self, key, ttl):
        self._maybe_fail()
        self.ttls[key] = ttl

    def publish(self, *a, **k):
        pass

    def delete(self, *a, **k):
        pass

    def exists(self, key):
        return False

    def set_ex(self, *a, **k):
        pass


CUSTOMER = {"X-Debug-Role": "customer", "X-Debug-Actor": "CUST-9527", "X-Agent-Type": "customer"}
ADVISOR = {"X-Debug-Role": "advisor", "X-Debug-Actor": "STAFF-10086", "X-Agent-Type": "advisor"}


@pytest.fixture()
def env(monkeypatch):
    engine = create_sqlite_engine()
    repo = RiskRepository(engine=engine)
    session_repo = SessionRepository(engine=engine)
    core_ro = CoreReadOnlyRepository(engine=engine)
    with engine.begin() as conn:  # 归属种子（rbac-seed-reference 口径）
        conn.execute(
            text("INSERT INTO core_customer_advisor (advisor_id, customer_id, rel_status)"
                 " VALUES ('STAFF-10086', 'CUST-9527', 'active'),"
                 "        ('STAFF-10087', 'CUST-1010', 'active')")
        )
    fake_redis = FakeRedis()
    monkeypatch.setattr(chat_mod, "_repo", lambda: repo)
    monkeypatch.setattr(chat_mod, "_session_repo", lambda: session_repo)
    monkeypatch.setattr(chat_mod, "_core_ro", lambda: core_ro)
    monkeypatch.setattr(memory_service, "_session_repo", lambda: session_repo)
    # T-04：Tool 节点经 tool_service 落库/查库，同一 sqlite 注入
    monkeypatch.setattr(tool_service, "_session_repo", lambda: session_repo)
    monkeypatch.setattr(tool_service, "_core_ro", lambda: core_ro)
    # T-04 复审：越权双写共用同一 sqlite 仓储——漏打桩会写脏本机演示 MySQL
    monkeypatch.setattr(tool_service, "_risk_repo", lambda: repo)
    monkeypatch.setattr(risk_api, "_repo", lambda: repo)
    monkeypatch.setattr(audit_mod, "_repo", lambda: repo)
    monkeypatch.setattr(deps_mod, "RiskRepository", lambda: repo)
    monkeypatch.setattr(redis_gateway, "_gateway", fake_redis)
    yield {"client": TestClient(app), "repo": repo, "engine": engine, "redis": fake_redis}
    engine.dispose()


def _rows(engine, sql, **params):
    with engine.connect() as conn:
        return [dict(r) for r in conn.execute(text(sql), params).mappings().all()]


def test_chat_new_session_creates_session_and_messages(env):
    r = env["client"].post("/api/chat", json={"message": "查一下我的持仓"}, headers=CUSTOMER)
    assert r.status_code == 200
    body = r.json()
    assert body["session_id"].startswith("sess-")
    assert body["agent_type"] == "customer"
    assert body["customer_id"] == "CUST-9527"
    assert body["has_disclaimer"] is True  # 客户对外口径（降级回复同样经 guard）
    assert body["trace_id"] == r.headers["X-Trace-Id"]

    sessions = _rows(env["engine"], "SELECT * FROM agent_session")
    assert len(sessions) == 1
    s = sessions[0]
    assert (s["actor_id"], s["agent_type"], s["actor_role"], s["customer_id"]) == (
        "CUST-9527", "customer", "customer", "CUST-9527"
    )
    assert s["trace_id"] == body["trace_id"]  # 手册 §9：会话绑定 trace_id
    msgs = _rows(
        env["engine"],
        "SELECT role, has_disclaimer FROM agent_message ORDER BY seq_no",
    )
    assert [(m["role"], m["has_disclaimer"]) for m in msgs] == [("user", 0), ("assistant", 1)]


def test_chat_resume_appends_messages(env):
    sid = env["client"].post("/api/chat", json={"message": "第一句"}, headers=CUSTOMER).json()["session_id"]
    r = env["client"].post("/api/chat", json={"message": "第二句", "session_id": sid}, headers=CUSTOMER)
    assert r.status_code == 200 and r.json()["session_id"] == sid
    msgs = _rows(env["engine"], "SELECT seq_no, role FROM agent_message ORDER BY seq_no")
    assert [m["role"] for m in msgs] == ["user", "assistant", "user", "assistant"]
    assert [m["seq_no"] for m in msgs] == [1, 2, 3, 4]


def test_chat_redis_window_written(env):
    r = env["client"].post("/api/chat", json={"message": "hi"}, headers=CUSTOMER)
    sid = r.json()["session_id"]
    key = f"sess:customer:{sid}:msgs"
    items = [json.loads(x) for x in env["redis"].lists[key]]
    assert [(m["role"], m["content"]) for m in items] == [("user", "hi"), ("assistant", items[1]["content"])]
    assert env["redis"].ttls[key] == 2 * 3600


def test_chat_redis_down_degrades(env, monkeypatch):
    """Redis 异常降级：窗口读写失败不阻塞对话（MySQL 为权威）。"""
    env["redis"].fail = True
    r = env["client"].post("/api/chat", json={"message": "hi"}, headers=CUSTOMER)
    assert r.status_code == 200


def test_chat_session_of_other_actor_denied(env):
    sid = env["client"].post("/api/chat", json={"message": "第一句"}, headers=CUSTOMER).json()["session_id"]
    other = {**CUSTOMER, "X-Debug-Actor": "CUST-1001"}
    r = env["client"].post("/api/chat", json={"message": "续聊", "session_id": sid}, headers=other)
    assert r.status_code == 403 and r.json()["error_code"] == "AUTH_403_SESSION_AGENT"
    assert _rows(env["engine"], "SELECT 1 FROM audit_log WHERE decision = 'forbidden'")


def test_chat_session_of_other_agent_type_denied(env):
    sid = env["client"].post("/api/chat", json={"message": "第一句"}, headers=CUSTOMER).json()["session_id"]
    r = env["client"].post(
        "/api/chat",
        json={"message": "续聊", "session_id": sid},
        headers={**ADVISOR, "X-Agent-Type": "advisor"},
    )
    assert r.status_code == 403 and r.json()["error_code"] == "AUTH_403_SESSION_AGENT"


def test_chat_customer_forged_customer_id_denied(env):
    r = env["client"].post(
        "/api/chat", json={"message": "hi", "customer_id": "CUST-1001"}, headers=CUSTOMER
    )
    assert r.status_code == 403 and r.json()["error_code"] == "AUTH_403_NOT_OWNER"


def test_chat_advisor_assigned_customer_ok(env):
    r = env["client"].post(
        "/api/chat", json={"message": "客户情况如何", "customer_id": "CUST-9527"}, headers=ADVISOR
    )
    assert r.status_code == 200
    body = r.json()
    assert body["customer_id"] == "CUST-9527"
    assert body["has_disclaimer"] is False  # 内部角色无免责声明


def test_chat_advisor_not_assigned_denied(env):
    r = env["client"].post(
        "/api/chat", json={"message": "hi", "customer_id": "CUST-1010"}, headers=ADVISOR
    )
    assert r.status_code == 403 and r.json()["error_code"] == "AUTH_403_NOT_ASSIGNED"


def test_chat_agent_type_missing_or_invalid(env):
    r = env["client"].post(
        "/api/chat", json={"message": "hi"}, headers={"X-Debug-Role": "customer", "X-Debug-Actor": "CUST-9527"}
    )
    assert r.status_code == 401 and r.json()["error_code"] == "AUTH_401_MISSING_AGENT_TYPE"
    r2 = env["client"].post("/api/chat", json={"message": "hi"}, headers={**CUSTOMER, "X-Agent-Type": "ops"})
    assert r2.status_code == 400


def test_chat_agent_mismatch_debug_channel(env):
    """手册 §5.4：advisor 角色不能进 customer agent（debug 通道同样强制）。"""
    r = env["client"].post(
        "/api/chat", json={"message": "hi"}, headers={**ADVISOR, "X-Agent-Type": "customer"}
    )
    assert r.status_code == 403 and r.json()["error_code"] == "AUTH_403_AGENT_MISMATCH"


def test_chat_session_not_found_and_closed(env):
    r = env["client"].post("/api/chat", json={"message": "hi", "session_id": "sess-nope"}, headers=CUSTOMER)
    assert r.status_code == 404

    sid = env["client"].post("/api/chat", json={"message": "hi"}, headers=CUSTOMER).json()["session_id"]
    with env["engine"].begin() as conn:
        conn.execute(text("UPDATE agent_session SET status = 'closed' WHERE session_id = :s"), {"s": sid})
    r2 = env["client"].post("/api/chat", json={"message": "hi", "session_id": sid}, headers=CUSTOMER)
    assert r2.status_code == 409 and r2.json()["error_code"] == "STATE_CONFLICT"


# ---------- T-04 Tool 全链路（经真路由栈触发 Tool 节点） ----------


def test_chat_tool_holdings_full_link(env):
    """持仓关键词触发 Tool：agent_tool_call 落库（trace/session 贯通）+ 降级回复带摘要。"""
    r = env["client"].post("/api/chat", json={"message": "查一下我的持仓"}, headers=CUSTOMER)
    assert r.status_code == 200
    body = r.json()
    rows = _rows(env["engine"], "SELECT * FROM agent_tool_call")
    assert len(rows) == 1
    row = rows[0]
    assert (row["session_id"], row["trace_id"], row["tool_name"], row["status"]) == (
        body["session_id"], body["trace_id"], "query_holdings", "success"
    )
    assert "LLM 未配置" in body["reply"]  # env 无 key 走降级
    assert "持仓查询" in body["reply"]  # 降级回复携带 Tool 摘要（env 无持仓种子 → 0 笔）


def test_chat_tool_no_intent_no_call(env):
    r = env["client"].post("/api/chat", json={"message": "今天天气如何"}, headers=CUSTOMER)
    assert r.status_code == 200
    assert _rows(env["engine"], "SELECT 1 FROM agent_tool_call") == []


def test_chat_tool_advisor_profile_query(env):
    """advisor（已分配）测评关键词 → L0 查询 success（A-01 归属链路）。"""
    with env["engine"].begin() as conn:
        conn.execute(
            text(
                "INSERT INTO core_customer (customer_id, display_name, age, is_active)"
                " VALUES ('CUST-9527', '张三', 45, 1)"
            )
        )
        conn.execute(
            text(
                "INSERT INTO core_customer_risk (customer_id, risk_code, evaluated_at)"
                " VALUES ('CUST-9527', 'B', '2026-08-01 10:00:00')"
            )
        )
    r = env["client"].post(
        "/api/chat", json={"message": "客户的风险测评等级", "customer_id": "CUST-9527"}, headers=ADVISOR
    )
    assert r.status_code == 200
    rows = _rows(env["engine"], "SELECT tool_name, status FROM agent_tool_call")
    assert [(x["tool_name"], x["status"]) for x in rows] == [("query_customer_profile", "success")]


def test_chat_tool_risk_agent_no_intent_rule(env):
    """risk 分支无意图规则（C1/C2 接风控 Tool），不触发 Core RO 查询。"""
    r = env["client"].post(
        "/api/chat",
        json={"message": "查一下我的持仓", "customer_id": "CUST-9527"},
        headers={"X-Debug-Role": "risk_officer", "X-Debug-Actor": "STAFF-30001", "X-Agent-Type": "risk"},
    )
    assert r.status_code == 200
    assert _rows(env["engine"], "SELECT 1 FROM agent_tool_call") == []


def test_chat_risk_manager_entry_denied(env):
    """C5 前置（PRD 4A.1）：对话线不放行 risk_manager——矩阵放行 HTTP 通道，
    chat 层显式 deny 保住 FR-6 冻结口径；返回 403 + AUTH_403_ROLE，且不得建会话。"""
    r = env["client"].post(
        "/api/chat",
        json={"message": "查一下预警台账", "customer_id": "CUST-9527"},
        headers={"X-Debug-Role": "risk_manager", "X-Debug-Actor": "STAFF-31001", "X-Agent-Type": "risk"},
    )
    assert r.status_code == 403
    assert r.json()["error_code"] == "AUTH_403_ROLE"
    assert _rows(env["engine"], "SELECT 1 FROM agent_session") == []


# ---------- JWT 通道（生产主链路 · 评审 P2-3） ----------


def test_chat_jwt_customer_new_session(env):
    tok = auth_service.issue_dev_token(
        sub="CUST-9527", roles=["customer"], token_type="customer", customer_id="CUST-9527"
    )
    r = env["client"].post(
        "/api/chat", json={"message": "查持仓"},
        headers={"Authorization": f"Bearer {tok}", "X-Agent-Type": "customer"},
    )
    assert r.status_code == 200
    body = r.json()
    assert body["customer_id"] == "CUST-9527" and body["has_disclaimer"] is True
    s = _rows(env["engine"], "SELECT actor_id, actor_role FROM agent_session")[0]
    assert (s["actor_id"], s["actor_role"]) == ("CUST-9527", "customer")


def test_chat_jwt_advisor_not_assigned_denied(env):
    tok = auth_service.issue_dev_token(sub="STAFF-10086", roles=["advisor"])
    r = env["client"].post(
        "/api/chat", json={"message": "hi", "customer_id": "CUST-1010"},
        headers={"Authorization": f"Bearer {tok}", "X-Agent-Type": "advisor"},
    )
    assert r.status_code == 403 and r.json()["error_code"] == "AUTH_403_NOT_ASSIGNED"


def test_chat_jwt_agent_mismatch_denied(env):
    tok = auth_service.issue_dev_token(sub="STAFF-30001", roles=["risk_officer"])
    r = env["client"].post(
        "/api/chat", json={"message": "hi"},
        headers={"Authorization": f"Bearer {tok}", "X-Agent-Type": "customer"},
    )
    assert r.status_code == 403 and r.json()["error_code"] == "AUTH_403_AGENT_MISMATCH"


# ---------- 方案 B：前端拉侧（会话列表 / 历史消息 / 关闭会话） ----------

RISK_OFFICER = {"X-Debug-Role": "risk_officer", "X-Debug-Actor": "STAFF-30001", "X-Agent-Type": "risk"}
RISK_MANAGER = {"X-Debug-Role": "risk_manager", "X-Debug-Actor": "STAFF-31001", "X-Agent-Type": "risk"}


def test_sessions_list_only_own_and_paged(env):
    """会话列表：仅本人 + 本 Agent 线；created_at 倒序；limit/offset 分页 + total。"""
    sid1 = env["client"].post("/api/chat", json={"message": "第一条"}, headers=CUSTOMER).json()["session_id"]
    sid2 = env["client"].post("/api/chat", json={"message": "第二条"}, headers=CUSTOMER).json()["session_id"]
    # 另一 actor 的会话不应出现在我的列表里
    env["client"].post(
        "/api/chat", json={"message": "别人的"},
        headers={"X-Debug-Role": "customer", "X-Debug-Actor": "CUST-1001", "X-Agent-Type": "customer"},
    )

    r = env["client"].get("/api/chat/sessions", headers=CUSTOMER)
    assert r.status_code == 200
    body = r.json()
    assert body["total"] == 2
    assert [s["session_id"] for s in body["items"]] == [sid2, sid1]  # 倒序
    assert all(s["agent_type"] == "customer" and s["status"] == "active" for s in body["items"])

    r2 = env["client"].get("/api/chat/sessions?limit=1&offset=1", headers=CUSTOMER)
    body2 = r2.json()
    assert body2["total"] == 2 and len(body2["items"]) == 1
    assert body2["items"][0]["session_id"] == sid1


def test_sessions_list_risk_line_isolated(env):
    """agent_type 隔离：risk 线会话不出现在 customer 线列表（反之亦然）。"""
    env["client"].post("/api/chat", json={"message": "客户线"}, headers=CUSTOMER)
    r = env["client"].get("/api/chat/sessions", headers=RISK_OFFICER)
    assert r.status_code == 200 and r.json()["total"] == 0


def test_messages_page_ascending_and_paged(env):
    """历史消息：seq_no 升序全量分页；has_disclaimer 透出；closed 后仍可读。"""
    sid = env["client"].post("/api/chat", json={"message": "第一句"}, headers=CUSTOMER).json()["session_id"]
    env["client"].post("/api/chat", json={"message": "第二句", "session_id": sid}, headers=CUSTOMER)

    r = env["client"].get(f"/api/chat/sessions/{sid}/messages", headers=CUSTOMER)
    assert r.status_code == 200
    body = r.json()
    assert body["total"] == 4
    assert [m["role"] for m in body["items"]] == ["user", "assistant", "user", "assistant"]
    assert [m["seq_no"] for m in body["items"]] == [1, 2, 3, 4]
    assert body["items"][0]["content"] == "第一句"
    assert body["items"][1]["has_disclaimer"] is True  # customer 线 assistant 带免责声明

    r2 = env["client"].get(f"/api/chat/sessions/{sid}/messages?limit=2&offset=2", headers=CUSTOMER)
    body2 = r2.json()
    assert body2["total"] == 4 and [m["seq_no"] for m in body2["items"]] == [3, 4]


def test_messages_of_other_actor_denied(env):
    """SessionGuard：他人会话历史 403 + 审计留痕（与 POST 同口径）。"""
    sid = env["client"].post("/api/chat", json={"message": "hi"}, headers=CUSTOMER).json()["session_id"]
    other = {**CUSTOMER, "X-Debug-Actor": "CUST-1001"}
    r = env["client"].get(f"/api/chat/sessions/{sid}/messages", headers=other)
    assert r.status_code == 403 and r.json()["error_code"] == "AUTH_403_SESSION_AGENT"
    assert _rows(env["engine"], "SELECT 1 FROM audit_log WHERE decision = 'forbidden'")


def test_messages_not_found_and_agent_type_mismatch(env):
    r = env["client"].get("/api/chat/sessions/sess-nope/messages", headers=CUSTOMER)
    assert r.status_code == 404
    sid = env["client"].post("/api/chat", json={"message": "hi"}, headers=CUSTOMER).json()["session_id"]
    # 会话在 customer 线，advisor 头查 → agent_type 不一致 403
    r2 = env["client"].get(f"/api/chat/sessions/{sid}/messages", headers=ADVISOR)
    assert r2.status_code == 403 and r2.json()["error_code"] == "AUTH_403_SESSION_AGENT"


def test_close_session_then_read_only(env):
    """关闭会话：200 + closed_at 落库；续聊 409；重复关闭 409；历史仍可读。"""
    sid = env["client"].post("/api/chat", json={"message": "hi"}, headers=CUSTOMER).json()["session_id"]

    r = env["client"].post(f"/api/chat/sessions/{sid}/close", headers=CUSTOMER)
    assert r.status_code == 200 and r.json() == {"session_id": sid, "status": "closed"}
    row = _rows(env["engine"], "SELECT status, closed_at FROM agent_session WHERE session_id = :s", s=sid)[0]
    assert row["status"] == "closed" and row["closed_at"] is not None

    r2 = env["client"].post("/api/chat", json={"message": "续聊", "session_id": sid}, headers=CUSTOMER)
    assert r2.status_code == 409 and r2.json()["error_code"] == "STATE_CONFLICT"

    r3 = env["client"].post(f"/api/chat/sessions/{sid}/close", headers=CUSTOMER)
    assert r3.status_code == 409 and r3.json()["error_code"] == "STATE_CONFLICT"

    r4 = env["client"].get(f"/api/chat/sessions/{sid}/messages", headers=CUSTOMER)
    assert r4.status_code == 200 and r4.json()["total"] == 2


def test_close_other_actor_denied(env):
    sid = env["client"].post("/api/chat", json={"message": "hi"}, headers=CUSTOMER).json()["session_id"]
    other = {**CUSTOMER, "X-Debug-Actor": "CUST-1001"}
    r = env["client"].post(f"/api/chat/sessions/{sid}/close", headers=other)
    assert r.status_code == 403 and r.json()["error_code"] == "AUTH_403_SESSION_AGENT"
    # 未关闭成功
    row = _rows(env["engine"], "SELECT status FROM agent_session WHERE session_id = :s", s=sid)[0]
    assert row["status"] == "active"


def test_close_not_found_and_agent_type_mismatch(env):
    """close 端点：会话不存在 404；会话在 customer 线、advisor 头关 → 403（评审 P2）。"""
    r = env["client"].post("/api/chat/sessions/sess-nope/close", headers=CUSTOMER)
    assert r.status_code == 404

    sid = env["client"].post("/api/chat", json={"message": "hi"}, headers=CUSTOMER).json()["session_id"]
    r2 = env["client"].post(f"/api/chat/sessions/{sid}/close", headers=ADVISOR)
    assert r2.status_code == 403 and r2.json()["error_code"] == "AUTH_403_SESSION_AGENT"
    row = _rows(env["engine"], "SELECT status FROM agent_session WHERE session_id = :s", s=sid)[0]
    assert row["status"] == "active"


def test_query_endpoints_limit_clamped(env):
    """分页参数钳制：limit 超上限（sessions 100 / messages 200）由 Query 拦 422（评审 P2）。"""
    assert env["client"].get("/api/chat/sessions?limit=101", headers=CUSTOMER).status_code == 422
    assert env["client"].get("/api/chat/sessions?offset=-1", headers=CUSTOMER).status_code == 422
    r = env["client"].get("/api/chat/sessions?limit=100", headers=CUSTOMER)
    assert r.status_code == 200 and r.json()["limit"] == 100


def test_query_endpoints_risk_manager_denied(env):
    """方案 B 拍板：查询/关闭端点与对话线同口径——risk_manager 一律 403 AUTH_403_ROLE。"""
    for method, url in (
        ("get", "/api/chat/sessions"),
        ("get", "/api/chat/sessions/sess-x/messages"),
        ("post", "/api/chat/sessions/sess-x/close"),
    ):
        r = getattr(env["client"], method)(url, headers=RISK_MANAGER)
        assert r.status_code == 403 and r.json()["error_code"] == "AUTH_403_ROLE"


def test_query_endpoints_missing_agent_type(env):
    r = env["client"].get(
        "/api/chat/sessions",
        headers={"X-Debug-Role": "customer", "X-Debug-Actor": "CUST-9527"},
    )
    assert r.status_code == 401 and r.json()["error_code"] == "AUTH_401_MISSING_AGENT_TYPE"


def test_sessions_list_jwt_channel(env):
    """JWT 通道：risk_officer 拉自己的 risk 线会话列表。"""
    tok = auth_service.issue_dev_token(sub="STAFF-30001", roles=["risk_officer"])
    headers = {"Authorization": f"Bearer {tok}", "X-Agent-Type": "risk"}
    env["client"].post("/api/chat", json={"message": "看下预警"}, headers=headers)
    r = env["client"].get("/api/chat/sessions", headers=headers)
    assert r.status_code == 200
    body = r.json()
    assert body["total"] == 1 and body["items"][0]["agent_type"] == "risk"
    assert body["items"][0]["actor_id"] == "STAFF-30001"