"""测试共享夹具，以及测试期的数据库连接池隔离。

为什么在这里替换引擎（必须在导入任何 app 模块之前执行）：

`app/infrastructure/db.py` 在导入时就建好了全局异步引擎，连接池里的 MySQL 连接绑定在
"建立它的那个事件循环"上。测试环境里同时存在多个循环——pytest-asyncio 每个用例一个、
每个 `TestClient` 一个 portal 线程循环、用例内 `asyncio.run(...)` 再建一个。连接被跨循环
复用时 SQLAlchemy/asyncmy 抛
`got Future <Future pending> attached to a different loop`，失败集合随执行顺序变化，
真实缺陷被噪声掩盖（同一用例全量跑失败、单条跑通过）。

NullPool 让每次取用都新建连接、归还即关闭，从根上消除跨循环复用。生产路径不受影响：
`app/infrastructure/db.py` 未改动，仍使用默认连接池。
"""

import asyncio
import sys

from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
from sqlalchemy.pool import NullPool

if sys.platform == "win32":
    asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())

from app.infrastructure import db as _db  # noqa: E402

_db.engine = create_async_engine(
    _db.engine.url, pool_pre_ping=True, poolclass=NullPool
)
_db.SessionFactory = async_sessionmaker(  # type: ignore[assignment]
    _db.engine, class_=AsyncSession, expire_on_commit=False
)

import pytest  # noqa: E402

from app.core.contracts import AgentDefinition, CoreResult, ResolvedAgentConfig  # noqa: E402
from app.service.agent.base import BaseAgent  # noqa: E402
from app.service.agent.factory import AgentFactory  # noqa: E402
from app.service.agent.governance import review_output  # noqa: E402


@pytest.fixture
def governance():
    class TestGovernance:
        async def resolve(self, definition, context):
            return ResolvedAgentConfig(config_version="test", prompt_version="test",
                                       model_endpoint="test")

        async def recall(self, context):
            return ()

        async def review(self, result, context, config, memories, *, agent_type: str = ""):
            # 透传 `agent_type`：门禁 F5（面向客户输出 100% 附固定话术）由它判定，
            # 替身若不转发，`test_worker_runtime_mysql` 那条端到端断言会拿不到免责声明。
            return review_output(result, context, config, memories, agent_type=agent_type)

    return TestGovernance()


@pytest.fixture
def acceptance_registry(monkeypatch, governance):
    """Explicit test registration; production does not silently create business Agents."""
    class TestAgent(BaseAgent):
        async def handle(self, request, context):
            return CoreResult(text="test result")

    definition = AgentDefinition(agent_type="customer_service", version="test",
                                 allowed_roles=("customer",), allowed_portals=("api",))
    registry = AgentFactory(governance)
    registry.register(definition, lambda _: TestAgent(definition))
    monkeypatch.setattr("app.service.agent_run_application_service.get_agent_factory",
                        lambda: registry)
    return registry