"""knowledge_service 硬编码默认 DeepSeek Key 清理回归（2026-10-18 P2 代码卫生）

覆盖：
1. 缺 DEEPSEEK_API_KEY → 抛 DeepSeekKeyMissing（不再拿假 Key 发请求）
2. 有 DEEPSEEK_API_KEY → 正常走请求链路并返回内容
3. API 层：缺 Key 时 /knowledge/generate/daily 返回 503 且错误可观测（非静默模板兜底）
4. API 层：有 Key 时行为不变（200 + 写入摘要）
"""
import asyncio
import types

import pytest
from fastapi.testclient import TestClient
from sqlalchemy.orm import Session

from app.services import knowledge_service
from app.services.knowledge_service import DeepSeekKeyMissing
from tests.conftest import create_test_user, get_token_for_user, auth_header


class _FakeResp:
    status_code = 200

    def json(self):
        return {"choices": [{"message": {"content": "测试摘要：本期无重大变化。"}}]}


class _FakeAsyncClient:
    def __init__(self, *a, **kw):
        pass

    async def __aenter__(self):
        return self

    async def __aexit__(self, *a):
        return False

    async def post(self, *a, **kw):
        return _FakeResp()


def _patch_httpx(monkeypatch):
    """只替换 knowledge_service 模块内的 httpx 引用，不动全局模块。"""
    monkeypatch.setattr(
        knowledge_service, "httpx", types.SimpleNamespace(AsyncClient=_FakeAsyncClient)
    )


# ── 服务层 ──

def test_service_raises_when_key_missing(monkeypatch):
    monkeypatch.delenv("DEEPSEEK_API_KEY", raising=False)
    with pytest.raises(DeepSeekKeyMissing) as ei:
        asyncio.run(knowledge_service._call_deepseek("hello"))
    assert "DEEPSEEK_API_KEY" in str(ei.value)


def test_service_works_when_key_present(monkeypatch):
    monkeypatch.setenv("DEEPSEEK_API_KEY", "sk-test-not-a-real-key")
    _patch_httpx(monkeypatch)
    out = asyncio.run(knowledge_service._call_deepseek("hello"))
    assert out == "测试摘要：本期无重大变化。"


def test_require_key_strips_blank(monkeypatch):
    monkeypatch.setenv("DEEPSEEK_API_KEY", "   ")
    with pytest.raises(DeepSeekKeyMissing):
        knowledge_service._require_deepseek_key()


# ── API 层 ──

def test_api_generate_daily_returns_503_without_key(client: TestClient, db: Session, monkeypatch):
    create_test_user(db)
    token = get_token_for_user(client, username="testadmin")
    monkeypatch.delenv("DEEPSEEK_API_KEY", raising=False)

    r = client.post("/api/cma/knowledge/generate/daily", headers=auth_header(token))
    assert r.status_code == 503, r.text
    detail = r.json()["detail"]
    assert "DEEPSEEK_API_KEY" in detail, detail


def test_api_generate_daily_ok_with_key(client: TestClient, db: Session, monkeypatch):
    create_test_user(db)
    token = get_token_for_user(client, username="testadmin")
    monkeypatch.setenv("DEEPSEEK_API_KEY", "sk-test-not-a-real-key")
    _patch_httpx(monkeypatch)

    r = client.post("/api/cma/knowledge/generate/daily", headers=auth_header(token))
    assert r.status_code == 200, r.text
    assert r.json()["summary"]["entity_id"] == 1