"""
Thread-ownership and task-hygiene tests.

Covers the Sippy→loop event funnel (events posted from a foreign
thread mutate loop-owned state), the AudioTap thread-safe feed, the
off-loop classifier entry point, leg-state propagation into the
CallManager, and background-task cancellation on gateway stop.
"""

import asyncio
import threading

import numpy as np

from config import ClassifierSettings, Settings
from core.gateway import AIPSTNGateway
from core.media_pipeline import AudioTap
from core.sippy_engine import SippyEngine
from models.call import CallStatus
from services.audio_classifier import AudioClassifier


def _engine_on_loop() -> SippyEngine:
    """Engine wired to the running loop without starting the SIP stack."""
    engine = SippyEngine()
    engine._loop = asyncio.get_running_loop()
    return engine


def _post_from_thread(engine: SippyEngine, kind: str, data: dict) -> None:
    """Post a funnel event from a foreign thread, like the Sippy ED thread."""
    t = threading.Thread(target=engine._post_from_ed, args=(kind, data))
    t.start()
    t.join()


class TestEngineEventFunnel:
    async def test_register_and_deregister_from_foreign_thread(self):
        engine = _engine_on_loop()

        _post_from_thread(engine, "register", {
            "aor": "sip:alice@gw", "contact": "sip:alice@10.0.0.5", "expires": 3600,
        })
        await asyncio.sleep(0.05)
        assert engine._registered_devices == [
            {"aor": "sip:alice@gw", "contact": "sip:alice@10.0.0.5", "expires": 3600}
        ]

        # Re-register updates in place instead of duplicating
        _post_from_thread(engine, "register", {
            "aor": "sip:alice@gw", "contact": "sip:alice@10.0.0.9", "expires": 60,
        })
        await asyncio.sleep(0.05)
        assert len(engine._registered_devices) == 1
        assert engine._registered_devices[0]["contact"] == "sip:alice@10.0.0.9"

        _post_from_thread(engine, "deregister", {"aor": "sip:alice@gw"})
        await asyncio.sleep(0.05)
        assert engine._registered_devices == []

    async def test_incoming_invite_auto_answers_without_callback(self):
        engine = _engine_on_loop()
        _post_from_thread(engine, "incoming_invite", {
            "leg_id": "leg_test1",
            "from_uri": "sip:caller@pstn",
            "to_uri": "sip:+15551234567@gw",
            "sdp": None,
        })
        await asyncio.sleep(0.05)
        leg = engine._legs["leg_test1"]
        assert leg.direction == "inbound"
        assert leg.state == "connected"

    async def test_incoming_call_callback_runs_as_tracked_task(self):
        engine = _engine_on_loop()
        seen = asyncio.Event()

        async def on_incoming(from_uri, to_uri, leg_id):
            seen.set()

        engine._on_incoming_call = on_incoming
        _post_from_thread(engine, "incoming_invite", {
            "leg_id": "leg_test2", "from_uri": "a", "to_uri": "b", "sdp": None,
        })
        await asyncio.wait_for(seen.wait(), timeout=1.0)
        assert engine._legs["leg_test2"].state == "init"  # not auto-answered

    async def test_bye_terminates_leg_and_notifies(self):
        engine = _engine_on_loop()
        states: list[tuple[str, str]] = []
        engine._on_leg_state_change = lambda leg_id, state: states.append((leg_id, state))

        _post_from_thread(engine, "incoming_invite", {
            "leg_id": "leg_test3", "from_uri": "a", "to_uri": "b", "sdp": None,
        })
        await asyncio.sleep(0.05)
        _post_from_thread(engine, "leg_state", {"leg_id": "leg_test3", "state": "terminated"})
        await asyncio.sleep(0.05)

        assert engine._legs["leg_test3"].state == "terminated"
        assert ("leg_test3", "terminated") in states

    async def test_dtmf_and_trunk_events(self):
        engine = _engine_on_loop()
        _post_from_thread(engine, "dtmf", {"leg_id": "leg_test4", "digit": "5"})
        _post_from_thread(engine, "trunk_registered", {"registered": True})
        await asyncio.sleep(0.05)
        assert engine._trunk_registered is True


class TestAudioTapThreadSafety:
    async def test_feed_from_foreign_thread_reaches_reader(self):
        tap = AudioTap("leg_x")
        frame = b"\x01\x02" * 320

        t = threading.Thread(target=tap.feed, args=(frame,))
        t.start()
        t.join()

        received = await tap.read_frame(timeout=1.0)
        assert received == frame


class TestClassifierOffLoop:
    async def test_classify_runs_and_records_history(self):
        classifier = AudioClassifier(ClassifierSettings())
        silence = np.zeros(16000, dtype=np.int16).tobytes()

        result = await classifier.classify(silence)

        assert result.audio_type.value == "silence"
        assert classifier._classification_history == [result.audio_type]


class TestLegStatePropagation:
    async def test_leg_lifecycle_drives_call_status(self):
        gateway = AIPSTNGateway(settings=Settings(max_concurrent_calls=4))
        call = await gateway.make_call("+15551234567")
        assert call.status == CallStatus.RINGING

        (leg_id,) = gateway.call_manager.legs_for_call(call.id)

        await gateway._on_sip_leg_state(leg_id, "connected")
        assert gateway.get_call(call.id).status == CallStatus.CONNECTED

        await gateway._on_sip_leg_state(leg_id, "terminated")
        assert gateway.get_call(call.id) is None
        assert gateway.call_manager.legs_for_call(call.id) == []

    async def test_late_signals_do_not_stomp_service_states(self):
        gateway = AIPSTNGateway(settings=Settings(max_concurrent_calls=4))
        call = await gateway.make_call("+15551234567")
        (leg_id,) = gateway.call_manager.legs_for_call(call.id)

        await gateway.call_manager.update_status(call.id, CallStatus.ON_HOLD)
        await gateway._on_sip_leg_state(leg_id, "connected")
        assert gateway.get_call(call.id).status == CallStatus.ON_HOLD


class TestTaskHygiene:
    async def test_gateway_stop_cancels_spawned_tasks(self):
        gateway = AIPSTNGateway(settings=Settings(max_concurrent_calls=4))
        task = gateway.spawn(asyncio.sleep(60), name="test_sleeper")

        await gateway.stop()

        assert task.cancelled()
        assert gateway._tasks == set()