"""Test fixtures for mcdbus."""

import asyncio

import pytest
from fastmcp import Client

from mcdbus._bus import BusManager
from mcdbus.server import mcp


@pytest.fixture(autouse=True)
def _reset_mcp_singleton():
    """Reset event-loop-bound state on the mcp singleton.

    FastMCP creates an asyncio.Event() at construction time. pytest-asyncio
    creates a fresh loop per test, so after test 1 the Event is bound to a
    dead loop and test 2 would crash. Re-creating these objects keeps every
    test isolated.
    """
    _PRIVATE_ATTRS = ("_started", "_lifespan_result", "_lifespan_result_set")
    for attr in _PRIVATE_ATTRS:
        if not hasattr(mcp, attr):
            raise AttributeError(
                f"FastMCP removed {attr!r} — fixture needs update "
                f"(fastmcp version may have changed)"
            )
    mcp._started = asyncio.Event()
    mcp._lifespan_result = None
    mcp._lifespan_result_set = False
    yield


@pytest.fixture
async def client():
    """MCP client connected via in-memory transport (no HTTP)."""
    async with Client(mcp) as c:
        yield c


@pytest.fixture
async def bus_manager():
    """Provide a BusManager instance, cleaned up after test."""
    mgr = BusManager()
    yield mgr
    await mgr.disconnect_all()


@pytest.fixture
async def session_bus(bus_manager: BusManager):
    """Provide a connected session bus."""
    return await bus_manager.get_bus("session")