"""C4 / FR-8 · RISK-006 持仓集中度：引擎接入 + 出单聚合 + 对话线专项测试。

覆盖实现方案 §6.2 中 C4 相关用例：

- 引擎：RISK-006 与 RISK-001 同单聚合、risk_score 取 max、payload.alert_subtype
  含 concentration、L3 打 high_risk_concentration 标签、risk_concentration 审计；
- 出单：alert_subtype 集合维护（空集不注入 / 追加时合并）、
  **P0-1 回归**：当日已有 agent_behavior 单后再触发 RISK-006 应出第二张客户维度单、
  **P1-3 修正**：既有 large_amount 单追加仅 RISK-006 时 alert_type 不翻转；
- 对话线：customer_context 带 concentration_ratio。

阈值说明：conftest 的 autouse fixture 把 `risk_concentration_threshold` 推到 1.01
（回归隔离），本模块内统一 monkeypatch 回真实阈值 0.80。
"""

from __future__ import annotations

from datetime import datetime
from decimal import Decimal

import pytest
from sqlalchemy import text

from _ddl import create_sqlite_engine

from app.repository.core_ro import CoreReadOnlyRepository
from app.repository.risk_repository import RiskRepository
from app.service.risk import alert_service
from app.service.risk.chat_tools import customer_context
from app.service.risk.engine import process_trade_event
from app.service.risk.rules import RiskThresholds, rule_concentration

NOW = datetime(2026, 9, 6, 14, 0, 0)


class FakePublisher:
    def __init__(self):
        self.messages: list = []

    def publish(self, channel, payload):
        self.messages.append((channel, payload))

    def delete(self, *keys):
        pass


@pytest.fixture()
def env(monkeypatch):
    """sqlite 环境：R3 产品（走交易）+ R5 产品（持仓主体，构成 90% 集中度）。

    持仓口径：P2(R5) 900000 + P1(R3) 100000 → R4+R5 占比 90% ≥ 0.80。
    """
    from app.config.settings import settings

    monkeypatch.setattr(settings, "risk_concentration_threshold", 0.80)

    engine = create_sqlite_engine()
    with engine.begin() as conn:
        conn.execute(
            text(
                "INSERT INTO core_customer (customer_id, display_name, age, is_active)"
                " VALUES ('C1', '张某某', 40, 1)"
            )
        )
        conn.execute(
            text(
                "INSERT INTO core_product (product_id, product_name, min_risk_code, product_type)"
                " VALUES ('P1', '测试混合基金', 'R3', 'mixed'),"
                "        ('P2', '测试股票基金', 'R5', 'equity')"
            )
        )
        conn.execute(
            text(
                "INSERT INTO core_holding (customer_id, product_id, market_value, qty,"
                " cost_amount, pnl_pct, as_of)"
                " VALUES ('C1', 'P2', 900000, 1000, 900000, 0, '2026-09-04'),"
                " ('C1', 'P1', 100000, 500, 100000, 0, '2026-09-04')"
            )
        )
    core = CoreReadOnlyRepository(engine=engine)
    repo = RiskRepository(engine=engine)
    pub = FakePublisher()
    alert_service.set_publisher(pub)
    yield core, repo, pub, engine
    alert_service.set_publisher(None)
    engine.dispose()


def _trade(trade_id, amount="600000", at=NOW):
    return {
        "trade_id": trade_id,
        "customer_id": "C1",
        "product_id": "P1",
        "trade_type": "subscribe",
        "amount": Decimal(amount),
        "traded_at": at,
    }


def _seed_trade(engine, trade):
    with engine.begin() as conn:
        conn.execute(
            text(
                "INSERT INTO core_trade (trade_id, customer_id, product_id, trade_type,"
                " amount, trade_status, traded_at)"
                " VALUES (:tid, :cid, :pid, :tt, :amt, 'confirmed', :at)"
            ),
            {
                "tid": trade["trade_id"],
                "cid": trade["customer_id"],
                "pid": trade["product_id"],
                "tt": trade["trade_type"],
                "amt": float(trade["amount"]),  # sqlite 不支持绑定 Decimal，转 float
                "at": trade["traded_at"],
            },
        )


def _insert_alert(engine, alert_id, alert_type, risk_score, rules, payload):
    import json

    with engine.begin() as conn:
        conn.execute(
            text(
                "INSERT INTO risk_alert (alert_id, trace_id, customer_id, trade_id,"
                " alert_type, triggered_rules, risk_score, status, payload)"
                " VALUES (:aid, 'TRACE-TEST', 'C1', 'TRD-TEST-0', :atype, :rules,"
                " :score, 'pending_review', :payload)"
            ),
            {
                "aid": alert_id,
                "atype": alert_type,
                "rules": json.dumps(rules),
                "score": risk_score,
                "payload": json.dumps(payload, ensure_ascii=False),
            },
        )


# ---------- 仓储聚合：concentration_profile ----------


def test_concentration_profile_aggregates_r4_r5(env):
    core, repo, pub, engine = env
    profile = core.concentration_profile("C1")
    assert profile["r45_value"] == Decimal(900000)
    assert profile["total_value"] == Decimal(1000000)
    assert profile["ratio"] == 0.9
    assert profile["holdings_truncated"] is False


def test_concentration_profile_empty_customer(env):
    core, repo, pub, engine = env
    profile = core.concentration_profile("NOT-EXIST")
    assert profile["total_value"] == Decimal(0)
    assert profile["ratio"] == 0.0
    assert rule_concentration(profile, RiskThresholds()) is None


# ---------- 引擎接入 ----------


def test_engine_merges_concentration_with_large_amount(env):
    """RISK-001(70) + RISK-006(60) 同单聚合：score 取 max=70，类型随最高分规则。"""
    core, repo, pub, engine = env
    trade = _trade("TRD-TEST-1")
    _seed_trade(engine, trade)

    result = process_trade_event(trade, core_ro=core, risk_repo=repo)

    # 600000 同时触发 RISK-002（≥ 单日累计 500000），故断言"包含"而非全等
    assert "RISK-001" in result["triggered_rules"]
    assert "RISK-006" in result["triggered_rules"]
    assert len(result["alert_ids"]) == 1  # 聚合成一张单

    alert = repo.get_alert(result["alert_ids"][0])
    assert alert["risk_score"] == 70
    assert alert["alert_type"] == "large_amount"  # 不被 RISK-006 翻转
    assert alert["payload"]["alert_subtype"] == ["concentration"]


def test_engine_writes_concentration_audit_and_l3_tag(env):
    core, repo, pub, engine = env
    trade = _trade("TRD-TEST-2")
    _seed_trade(engine, trade)

    result = process_trade_event(trade, core_ro=core, risk_repo=repo)

    with engine.connect() as conn:
        audit = conn.execute(
            text(
                "SELECT event_type, rule_id, risk_score FROM audit_log"
                " WHERE event_type = 'risk_concentration'"
            )
        ).mappings().all()
    assert len(audit) == 1
    assert audit[0]["rule_id"] == "RISK-006"

    l3 = repo.get_l3("C1")
    assert "high_risk_concentration" in (l3.get("monitor_tags") or [])


def test_engine_concentration_only_still_creates_alert(env):
    """仅命中集中度（未达大额）也要出单——无需为「仅 RISK-006」写独立分支。"""
    core, repo, pub, engine = env
    trade = _trade("TRD-TEST-3", amount="10000")
    _seed_trade(engine, trade)

    result = process_trade_event(trade, core_ro=core, risk_repo=repo)

    assert result["triggered_rules"] == ["RISK-006"]
    alert = repo.get_alert(result["alert_ids"][0])
    assert alert["risk_score"] == 60
    assert alert["alert_type"] == "pattern"


def test_engine_disabled_when_threshold_unreachable(env, monkeypatch):
    """回归隔离口径：阈值推到 1.01 后 RISK-006 不触发（conftest autouse 同款行为）。"""
    from app.config.settings import settings

    monkeypatch.setattr(settings, "risk_concentration_threshold", 1.01)
    core, repo, pub, engine = env
    trade = _trade("TRD-TEST-4", amount="10000")
    _seed_trade(engine, trade)

    result = process_trade_event(trade, core_ro=core, risk_repo=repo)
    assert result["triggered_rules"] == []


# ---------- 出单：alert_subtype 与聚合锚点 ----------


def test_append_merges_subtypes(env):
    """追加到老单时，extra_subtypes 合并进 payload.alert_subtype（老单原本无该字段）。"""
    core, repo, pub, engine = env
    _insert_alert(
        engine, "ALT-TEST-OLD", "large_amount", 70, ["RISK-001"], {"product_id": "P1", "events": []}
    )
    trade = _trade("TRD-TEST-5", amount="10000")
    _seed_trade(engine, trade)

    result = process_trade_event(trade, core_ro=core, risk_repo=repo)

    # 老单被追加，不新建
    assert result["alert_ids"] == ["ALT-TEST-OLD"]
    alert = repo.get_alert("ALT-TEST-OLD")
    assert alert["payload"]["alert_subtype"] == ["concentration"]
    assert alert["risk_score"] == 70  # max(70, 60)


def test_alert_type_not_flipped_by_lower_score_rule(env):
    """评审 P1-3：既有 large_amount(70) 单追加仅 RISK-006(60) 时，类型保持 large_amount。"""
    core, repo, pub, engine = env
    _insert_alert(
        engine, "ALT-TEST-KEEP", "large_amount", 70, ["RISK-001"], {"product_id": "P1", "events": []}
    )
    from app.service.risk.alert_service import record_trade_alerts

    profile = core.concentration_profile("C1")
    hit = rule_concentration(profile, RiskThresholds.from_settings())
    assert hit is not None

    trade = _trade("TRD-TEST-6", amount="10000")
    updated = record_trade_alerts(trade, [hit], risk_repo=repo)
    assert updated["alert_type"] == "large_amount"


def test_p0_1_agent_behavior_alert_is_not_anchor(env):
    """评审 P0-1 回归：当日已有 agent_behavior 单 → RISK-006 应新建客户维度单，不并入。"""
    core, repo, pub, engine = env
    _insert_alert(
        engine,
        "ALT-TEST-AGENT",
        "pattern",
        70,
        ["RISK-008"],
        {"product_id": "P1", "events": [], "alert_subtype": ["agent_behavior"]},
    )
    trade = _trade("TRD-TEST-7", amount="10000")
    _seed_trade(engine, trade)

    result = process_trade_event(trade, core_ro=core, risk_repo=repo)

    assert result["alert_ids"] and result["alert_ids"][0] != "ALT-TEST-AGENT"
    new_alert = repo.get_alert(result["alert_ids"][0])
    assert new_alert["payload"]["alert_subtype"] == ["concentration"]

    agent_alert = repo.get_alert("ALT-TEST-AGENT")
    assert agent_alert["payload"]["alert_subtype"] == ["agent_behavior"]  # 未被污染


# ---------- 对话线 ----------


def test_customer_context_includes_concentration_ratio(env):
    core, repo, pub, engine = env
    data = customer_context("C1", core_ro=core, risk_repo=repo)
    assert data["found"] is True
    assert data["profile"]["concentration_ratio"] == 0.9
    assert data["profile"]["holdings_truncated"] is False


def test_customer_context_zero_holdings(env):
    core, repo, pub, engine = env
    with engine.begin() as conn:
        conn.execute(
            text(
                "INSERT INTO core_customer (customer_id, display_name, age, is_active)"
                " VALUES ('C9', '空仓客户', 30, 1)"
            )
        )
    data = customer_context("C9", core_ro=core, risk_repo=repo)
    assert data["found"] is True
    assert data["profile"]["concentration_ratio"] == 0.0