"""B-Step1c: intent router settings, shadow logger, and Builder flow mount (P0 observe-only)."""

from __future__ import annotations

from typing import Any

import pytest

from app.chat_intent_classifier import RuleBasedChatIntentClassifier
from app.chat_intent_shadow import (
    ChatIntentShadowLogger,
    build_chat_intent_shadow,
)
from app.chat_intents import ChatTurnClassification
from app.settings import Settings, load_settings
from builder_flow_helpers import create_builder_session, send_message


def test_intent_router_settings_defaults() -> None:
    settings = Settings()
    assert settings.intent_router_mode == "off"
    assert settings.intent_model is None


def test_intent_router_settings_from_env(monkeypatch: pytest.MonkeyPatch, tmp_path: Any) -> None:
    monkeypatch.setenv("RESUME_AGENT_INTENT_ROUTER_MODE", "shadow")
    monkeypatch.setenv("RESUME_AGENT_INTENT_MODEL", "kimi-k3")
    settings = load_settings(tmp_path / "missing.env")
    assert settings.intent_router_mode == "shadow"
    assert settings.intent_model == "kimi-k3"
    monkeypatch.setenv("RESUME_AGENT_INTENT_ROUTER_MODE", "bogus")
    with pytest.raises(ValueError, match="INTENT_ROUTER_MODE"):
        load_settings(tmp_path / "missing.env")


class _StubClassifier:
    def __init__(self, result: ChatTurnClassification | None = None, exc: Exception | None = None) -> None:
        self.result = result
        self.exc = exc

    def classify(self, message: str, *, state_summary: dict[str, Any]) -> ChatTurnClassification:
        if self.exc:
            raise self.exc
        assert self.result is not None
        return self.result


def _captured_events(monkeypatch: pytest.MonkeyPatch) -> list[tuple[str, dict[str, Any]]]:
    events: list[tuple[str, dict[str, Any]]] = []
    monkeypatch.setattr(
        "app.chat_intent_shadow.log_ai_event",
        lambda event, **fields: events.append((event, fields)),
    )
    return events


def test_shadow_logs_llm_vs_rule_disagreement(monkeypatch: pytest.MonkeyPatch) -> None:
    events = _captured_events(monkeypatch)
    shadow = ChatIntentShadowLogger(
        _StubClassifier(ChatTurnClassification(intent="ask_question", confidence=0.9)),
        RuleBasedChatIntentClassifier(),
    )
    shadow.observe("没有", state_summary={})
    assert events == [
        (
            "chat_intent_shadow",
            {
                "registry_version": "1",
                "rule_intent": "no_info",
                "llm_intent": "ask_question",
                "llm_confidence": 0.9,
                "disagreement": True,
            },
        )
    ]


def test_shadow_logs_agreement_and_survives_llm_failure(monkeypatch: pytest.MonkeyPatch) -> None:
    events = _captured_events(monkeypatch)
    agree = ChatIntentShadowLogger(
        _StubClassifier(ChatTurnClassification(intent="no_info")),
        RuleBasedChatIntentClassifier(),
    )
    agree.observe("没有", state_summary={})
    assert events[0][1]["disagreement"] is False

    failing = ChatIntentShadowLogger(
        _StubClassifier(exc=RuntimeError("boom")),
        RuleBasedChatIntentClassifier(),
    )
    failing.observe("没有", state_summary={})  # must not raise
    assert events[1][0] == "chat_intent_shadow_error"


def test_build_chat_intent_shadow_requires_shadow_mode_and_openai() -> None:
    openai = {"llm_provider": "openai", "openai_api_key": "k"}
    assert build_chat_intent_shadow(Settings(**openai, intent_router_mode="off")) is None
    assert build_chat_intent_shadow(Settings(llm_provider="rule", intent_router_mode="shadow")) is None
    shadow = build_chat_intent_shadow(Settings(**openai, intent_router_mode="shadow"))
    assert isinstance(shadow, ChatIntentShadowLogger)
    tuned = build_chat_intent_shadow(Settings(**openai, intent_router_mode="shadow", intent_model="kimi-k3"))
    assert tuned is not None
    assert tuned.primary._client.settings.openai_model == "kimi-k3"


class _Spy:
    def __init__(self, *, raises: bool = False) -> None:
        self.raises = raises
        self.calls: list[dict[str, Any]] = []

    def observe(self, message: str, *, state_summary: dict[str, Any]) -> None:
        if self.raises:
            raise RuntimeError("spy boom")
        self.calls.append({"message": message, "state_summary": state_summary})


def test_process_message_notifies_mounted_shadow(client: Any, monkeypatch: pytest.MonkeyPatch) -> None:
    agent = client.app.state.resume_agent
    spy = _Spy()
    monkeypatch.setattr(agent, "_chat_intent_shadow", spy, raising=False)
    session_id, _ = create_builder_session(client)
    send_message(client, session_id, "新增一段教育经历")
    assert spy.calls[0]["message"] == "新增一段教育经历"
    assert "confirmed_entries" in spy.calls[0]["state_summary"]


def test_shadow_failure_never_breaks_routing(client: Any, monkeypatch: pytest.MonkeyPatch) -> None:
    agent = client.app.state.resume_agent
    monkeypatch.setattr(agent, "_chat_intent_shadow", _Spy(raises=True), raising=False)
    session_id, _ = create_builder_session(client)
    body = send_message(client, session_id, "新增一段教育经历")
    assert body["turn"]["role"] == "assistant"