"""Tests for interaction tools — requires a running session bus."""

from mcdbus._bus import BusManager, call_bus_method


async def test_ping(bus_manager: BusManager):
    """Ping the DBus daemon — universal no-arg method."""
    bus = await bus_manager.get_bus("session")
    result = await call_bus_method(
        bus,
        destination="org.freedesktop.DBus",
        path="/org/freedesktop/DBus",
        interface="org.freedesktop.DBus.Peer",
        member="Ping",
    )
    # Ping returns void (None)
    assert result is None


async def test_get_id(bus_manager: BusManager):
    """GetId returns the bus unique ID as a hex string."""
    bus = await bus_manager.get_bus("session")
    result = await call_bus_method(
        bus,
        destination="org.freedesktop.DBus",
        path="/org/freedesktop/DBus",
        interface="org.freedesktop.DBus",
        member="GetId",
    )
    bus_id = result[0]
    assert isinstance(bus_id, str)
    assert len(bus_id) > 10


async def test_get_name_owner(bus_manager: BusManager):
    """GetNameOwner returns the unique connection for a well-known name."""
    bus = await bus_manager.get_bus("session")
    result = await call_bus_method(
        bus,
        destination="org.freedesktop.DBus",
        path="/org/freedesktop/DBus",
        interface="org.freedesktop.DBus",
        member="GetNameOwner",
        signature="s",
        body=["org.freedesktop.DBus"],
    )
    owner = result[0]
    assert isinstance(owner, str)
    assert len(owner) > 0


async def test_method_call_error(bus_manager: BusManager):
    """Calling a non-existent method should raise RuntimeError."""
    import pytest

    bus = await bus_manager.get_bus("session")
    with pytest.raises(RuntimeError, match="D-Bus error"):
        await call_bus_method(
            bus,
            destination="org.freedesktop.DBus",
            path="/org/freedesktop/DBus",
            interface="org.freedesktop.DBus",
            member="NonExistentMethod",
        )


async def test_system_bus_accessible(bus_manager: BusManager):
    """Verify system bus is accessible and can list units (if systemd is running)."""
    bus = await bus_manager.get_bus("system")
    result = await call_bus_method(
        bus,
        destination="org.freedesktop.DBus",
        path="/org/freedesktop/DBus",
        interface="org.freedesktop.DBus",
        member="ListNames",
    )
    names = result[0]
    assert "org.freedesktop.DBus" in names