"""Integration-style tests for the worker's fallback path.

Pinned behaviors:
    - When classification fails, the direct/fallback path must NOT call
      ``backend_registry.classifier`` (its CLASSIFIER_PROMPT would leak
      router JSON to the user).
    - The fallback path must call ``backend_registry.chat_fallback``.
    - Router-shaped JSON returned from chat_fallback is suppressed.
    - chat_fallback adapter being None or raising returns "".

These tests touch ``services.worker``, which imports the rest of the app
(config, db, tools). Run them in the nanoclaude venv where all deps live;
locally without those deps, pytest will skip the module.
"""

from __future__ import annotations

import asyncio
from unittest.mock import AsyncMock, MagicMock

import pytest

# Skip the whole module if heavy deps (aiosqlite, caldav, ...) aren't
# available. Prevents local devs from seeing a wall of ImportError.
pytest.importorskip("aiosqlite")
pytest.importorskip("caldav")

from services import worker  # noqa: E402
from services.backend_registry import backend_registry  # noqa: E402


def _make_job(message: str = "안녕"):
    job = MagicMock()
    job.id = "test-job"
    job.message = message
    job.callback = "synology"
    job.status = "processing"
    job.response_sent = False
    return job


@pytest.fixture(autouse=True)
def _patch_state_stream(monkeypatch):
    """state_stream.push is awaited from inside _fetch_fallback_text.
    Replace with an AsyncMock so the test doesn't try to send real events."""
    fake_stream = MagicMock()
    fake_stream.push = AsyncMock()
    fake_stream.push_done = AsyncMock()
    monkeypatch.setattr(worker, "state_stream", fake_stream)
    return fake_stream


@pytest.fixture(autouse=True)
def _bypass_heartbeat(monkeypatch):
    """_complete_with_heartbeat normally sleeps 2s between heartbeats. Bypass
    by replacing it with a thin shim that just awaits adapter.complete_chat."""

    async def _direct_call(adapter, message, job_id, *, messages=None, beat_msg=""):
        return await adapter.complete_chat(message, messages=messages)

    monkeypatch.setattr(worker, "_complete_with_heartbeat", _direct_call)


@pytest.mark.asyncio
async def test_fallback_uses_chat_fallback_not_classifier(monkeypatch):
    classifier_mock = MagicMock()
    classifier_mock.complete_chat = AsyncMock(
        return_value="this should never reach the user"
    )
    chat_fallback_mock = MagicMock()
    chat_fallback_mock.complete_chat = AsyncMock(
        return_value="자연스러운 답변입니다."
    )

    monkeypatch.setattr(backend_registry, "classifier", classifier_mock)
    monkeypatch.setattr(backend_registry, "chat_fallback", chat_fallback_mock)

    result = await worker._fetch_fallback_text(_make_job())

    assert result == "자연스러운 답변입니다."
    chat_fallback_mock.complete_chat.assert_awaited_once()
    classifier_mock.complete_chat.assert_not_called()


@pytest.mark.asyncio
async def test_fallback_suppresses_router_json_output(monkeypatch):
    chat_fallback_mock = MagicMock()
    # The exact bug shape from production: chat-side model emits router JSON.
    chat_fallback_mock.complete_chat = AsyncMock(
        return_value=(
            '{"action": "route", "response": "사용자님의 깊은 감정이 담긴 글이네요.", '
            '"prompt": "노래 가사를 분석해주세요."}'
        )
    )
    monkeypatch.setattr(backend_registry, "chat_fallback", chat_fallback_mock)

    result = await worker._fetch_fallback_text(_make_job())

    assert result == ""  # Suppressed by leak guard


@pytest.mark.asyncio
async def test_fallback_returns_empty_when_adapter_missing(monkeypatch):
    monkeypatch.setattr(backend_registry, "chat_fallback", None)
    result = await worker._fetch_fallback_text(_make_job())
    assert result == ""


@pytest.mark.asyncio
async def test_fallback_returns_empty_on_adapter_exception(monkeypatch):
    chat_fallback_mock = MagicMock()
    chat_fallback_mock.complete_chat = AsyncMock(
        side_effect=RuntimeError("connection refused")
    )
    monkeypatch.setattr(backend_registry, "chat_fallback", chat_fallback_mock)

    result = await worker._fetch_fallback_text(_make_job())

    assert result == ""


@pytest.mark.asyncio
async def test_fallback_strips_whitespace(monkeypatch):
    chat_fallback_mock = MagicMock()
    chat_fallback_mock.complete_chat = AsyncMock(
        return_value="   안녕하세요!\n  "
    )
    monkeypatch.setattr(backend_registry, "chat_fallback", chat_fallback_mock)

    result = await worker._fetch_fallback_text(_make_job())

    assert result == "안녕하세요!"


@pytest.mark.asyncio
async def test_chat_fallback_adapter_uses_chat_prompt_not_classifier_prompt():
    """Spec contract: the chat_fallback adapter must NOT carry CLASSIFIER_PROMPT.
    If init_from_settings ever wires the wrong prompt onto chat_fallback, this
    test catches it before the leak hits production."""
    from config import settings
    from services.backend_registry import (
        BackendRegistry,
        CHAT_FALLBACK_PROMPT,
        CLASSIFIER_PROMPT,
    )

    registry = BackendRegistry()
    registry.init_from_settings(settings)

    assert registry.chat_fallback is not None
    assert registry.chat_fallback.system_prompt == CHAT_FALLBACK_PROMPT
    assert registry.chat_fallback.system_prompt != CLASSIFIER_PROMPT