"""
MQTTForwardClient 单元测试

通过注入 FakeMQTT 验证发布逻辑，不连接真实 Broker。
"""
import json

from chongming_mqtt.mqtt_forward import MQTTForwardClient

from fakes import attach, run


def test_uri_credentials_decoded():
    """URI 中 percent-encoded 凭据应被解码（%40 -> @）"""
    client = MQTTForwardClient("mqtt://admin:Mixc%402021@dg.datagoo.cn:48081", "/t")
    assert client._username == "admin"
    assert client._password == "Mixc@2021"
    assert client._clean_uri == "mqtt://dg.datagoo.cn:48081"


def test_publish_not_running_returns_false():
    """未连接时 publish 应返回 False 且不抛异常"""
    client = MQTTForwardClient("mqtt://h:1883", "/t")
    assert run(client.publish({"x": 1})) is False


def test_publish_uses_default_topic():
    """未指定 topic 时发布到构造时的默认主题"""
    client = MQTTForwardClient("mqtt://h:1883", "/board_ping")
    fake = attach(client)
    assert run(client.publish({"BoardId": "B1"})) is True
    topic, payload, _ = fake.published[0]
    assert topic == "/board_ping"
    assert json.loads(payload) == {"BoardId": "B1"}


def test_publish_specified_topic():
    """显式 topic 应覆盖默认主题"""
    client = MQTTForwardClient("mqtt://h:1883", "/default")
    fake = attach(client)
    run(client.publish({"a": 1}, topic="/custom"))
    assert fake.published[0][0] == "/custom"


def test_publish_exception_returns_false():
    """底层发布异常时应返回 False"""
    client = MQTTForwardClient("mqtt://h:1883", "/t")

    class BoomMQTT:
        async def publish(self, topic, payload, qos):
            raise RuntimeError("boom")

    client._client = BoomMQTT() # type: ignore
    client._running = True
    assert run(client.publish({"a": 1})) is False


def test_stop_disconnects_and_clears_flag():
    """stop() 应断开连接并复位运行标志"""
    client = MQTTForwardClient("mqtt://h:1883", "/t")
    fake = attach(client)
    run(client.stop())
    assert fake.disconnected is True
    assert client.is_running is False