from __future__ import annotations

import asyncio

import pytest

from yuxi.channels.infra.broadcast import EventBroadcaster


class TestEventBroadcaster:
    @pytest.mark.asyncio
    async def test_broadcast_delivers_to_subscriber(self):
        broadcaster = EventBroadcaster()
        queue = broadcaster.subscribe("test.event")

        await broadcaster.broadcast("test.event", {"key": "value"})

        received = await asyncio.wait_for(queue.get(), timeout=1.0)
        assert received == {"event": "test.event", "payload": {"key": "value"}}

    @pytest.mark.asyncio
    async def test_broadcast_does_not_deliver_to_other_events(self):
        broadcaster = EventBroadcaster()
        queue = broadcaster.subscribe("event.a")

        await broadcaster.broadcast("event.b", {"key": "value"})

        with pytest.raises(asyncio.TimeoutError):
            await asyncio.wait_for(queue.get(), timeout=0.1)

    @pytest.mark.asyncio
    async def test_wildcard_subscriber_receives_all(self):
        broadcaster = EventBroadcaster()
        queue = broadcaster.subscribe("*")

        await broadcaster.broadcast("any.event", {"key": "value"})

        received = await asyncio.wait_for(queue.get(), timeout=1.0)
        assert received == {"event": "any.event", "payload": {"key": "value"}}

    @pytest.mark.asyncio
    async def test_unsubscribe_stops_delivery(self):
        broadcaster = EventBroadcaster()
        queue = broadcaster.subscribe("test.event")
        broadcaster.unsubscribe("test.event", queue)

        await broadcaster.broadcast("test.event", {})

        with pytest.raises(asyncio.TimeoutError):
            await asyncio.wait_for(queue.get(), timeout=0.1)

    @pytest.mark.asyncio
    async def test_unsubscribe_nonexistent_does_not_raise(self):
        broadcaster = EventBroadcaster()
        queue: asyncio.Queue = asyncio.Queue()
        broadcaster.unsubscribe("nonexistent", queue)

    @pytest.mark.asyncio
    async def test_node_send_to_session(self):
        broadcaster = EventBroadcaster()
        queue = broadcaster.subscribe("session:sess-1")

        await broadcaster.node_send_to_session("sess-1", "custom.event", {"data": 1})

        received = await asyncio.wait_for(queue.get(), timeout=1.0)
        assert received == {"event": "custom.event", "payload": {"data": 1}}

    @pytest.mark.asyncio
    async def test_multiple_subscribers_same_event(self):
        broadcaster = EventBroadcaster()
        q1 = broadcaster.subscribe("multi")
        q2 = broadcaster.subscribe("multi")

        await broadcaster.broadcast("multi", {"x": 1})

        r1 = await asyncio.wait_for(q1.get(), timeout=1.0)
        r2 = await asyncio.wait_for(q2.get(), timeout=1.0)
        assert r1["payload"] == {"x": 1}
        assert r2["payload"] == {"x": 1}

    def test_subscriber_count(self):
        broadcaster = EventBroadcaster()
        assert broadcaster.subscriber_count() == 0

        broadcaster.subscribe("e1")
        broadcaster.subscribe("e1")
        broadcaster.subscribe("e2")
        assert broadcaster.subscriber_count("e1") == 2
        assert broadcaster.subscriber_count("e2") == 1
        assert broadcaster.subscriber_count() == 3

    @pytest.mark.asyncio
    async def test_callback_subscription_receives_broadcast(self):
        broadcaster = EventBroadcaster()
        received = []

        def handler(event, payload):
            received.append((event, payload))

        broadcaster.subscribe_callback("test.event", handler)
        await broadcaster.broadcast("test.event", {"data": 1})

        assert received == [("test.event", {"data": 1})]

    @pytest.mark.asyncio
    async def test_async_callback_subscription(self):
        broadcaster = EventBroadcaster()
        received = []

        async def handler(event, payload):
            received.append((event, payload))

        broadcaster.subscribe_callback("test.event", handler)
        await broadcaster.broadcast("test.event", {"data": 1})

        assert received == [("test.event", {"data": 1})]

    @pytest.mark.asyncio
    async def test_wildcard_callback_receives_all(self):
        broadcaster = EventBroadcaster()
        received = []

        def handler(event, payload):
            received.append(event)

        broadcaster.subscribe_callback("*", handler)
        await broadcaster.broadcast("event.a", {})
        await broadcaster.broadcast("event.b", {})

        assert received == ["event.a", "event.b"]

    @pytest.mark.asyncio
    async def test_unsubscribe_callback_stops_delivery(self):
        broadcaster = EventBroadcaster()
        received = []

        def handler(event, payload):
            received.append(event)

        broadcaster.subscribe_callback("test.event", handler)
        broadcaster.unsubscribe_callback("test.event", handler)
        await broadcaster.broadcast("test.event", {})

        assert received == []

    def test_subscriber_count_includes_callbacks(self):
        broadcaster = EventBroadcaster()
        broadcaster.subscribe("e1")
        broadcaster.subscribe_callback("e1", lambda e, p: None)
        broadcaster.subscribe_callback("e2", lambda e, p: None)
        assert broadcaster.subscriber_count("e1") == 2
        assert broadcaster.subscriber_count("e2") == 1
        assert broadcaster.subscriber_count() == 3

    @pytest.mark.asyncio
    async def test_callback_error_does_not_block_broadcast(self):
        broadcaster = EventBroadcaster()
        received = []

        def good_handler(event, payload):
            received.append(event)

        def bad_handler(event, payload):
            raise RuntimeError("boom")

        broadcaster.subscribe_callback("test.event", bad_handler)
        broadcaster.subscribe_callback("test.event", good_handler)
        await broadcaster.broadcast("test.event", {})

        assert received == ["test.event"]

    @pytest.mark.asyncio
    async def test_broadcast_without_payload(self):
        broadcaster = EventBroadcaster()
        queue = broadcaster.subscribe("test.event")

        await broadcaster.broadcast("test.event")

        received = await asyncio.wait_for(queue.get(), timeout=1.0)
        assert received == {"event": "test.event", "payload": None}