import asyncio
import logging
from importlib.metadata import EntryPoint
from unittest.mock import patch

import pytest

from amqtt.broker import Broker
from amqtt.client import MQTTClient
from amqtt.mqtt.constants import QOS_0

logger = logging.getLogger(__name__)

all_sys_topics = [
    '$SYS/broker/version',
    '$SYS/broker/load/bytes/received',
    '$SYS/broker/load/bytes/sent',
    '$SYS/broker/messages/received',
    '$SYS/broker/messages/sent',
    '$SYS/broker/time',
    '$SYS/broker/uptime',
    '$SYS/broker/uptime/formatted',
    '$SYS/broker/clients/connected',
    '$SYS/broker/clients/disconnected',
    '$SYS/broker/clients/maximum',
    '$SYS/broker/clients/total',
    '$SYS/broker/messages/inflight',
    '$SYS/broker/messages/inflight/in',
    '$SYS/broker/messages/inflight/out',
    '$SYS/broker/messages/inflight/stored',
    '$SYS/broker/messages/publish/received',
    '$SYS/broker/messages/publish/sent',
    '$SYS/broker/messages/retained/count',
    '$SYS/broker/messages/subscriptions/count'
]



# test broker sys
@pytest.mark.asyncio
async def test_broker_sys_plugin() -> None:

    sys_topic_flags = {sys_topic:False for sys_topic in all_sys_topics}

    class MockEntryPoints:

        def select(self, group) -> list[EntryPoint]:
            match group:
                case 'tests.mock_plugins':
                    return [
                            EntryPoint(name='BrokerSysPlugin', group='tests.mock_plugins', value='amqtt.plugins.sys.broker:BrokerSysPlugin'),
                        ]
                case _:
                    return list()


    with patch("amqtt.plugins.manager.entry_points", side_effect=MockEntryPoints) as mocked_mqtt_publish:

        config = {
            "listeners": {
                "default": {"type": "tcp", "bind": "127.0.0.1:1883", "max_connections": 10},
            },
            'sys_interval': 1
        }

        broker = Broker(plugin_namespace='tests.mock_plugins', config=config)
        await broker.start()
        client = MQTTClient()
        await client.connect("mqtt://127.0.0.1:1883/")
        await client.subscribe([("$SYS/#", QOS_0),])
        await client.publish('test/topic', b'my test message')
        await asyncio.sleep(2)
        sys_msg_count = 0
        try:
            while sys_msg_count < 30:
                message = await client.deliver_message(timeout_duration=1)
                if '$SYS' in message.topic:
                    sys_msg_count += 1
                    assert message.topic in sys_topic_flags
                    sys_topic_flags[message.topic] = True

        except asyncio.TimeoutError:
            logger.debug(f"TimeoutError after {sys_msg_count} messages")

        await client.disconnect()
        await broker.shutdown()

        assert sys_msg_count > 1

        assert all(sys_topic_flags.values()), f'topic not received: {[ topic for topic, flag in sys_topic_flags.items() if not flag ]}'