package mqttbroker

import (
	"testing"
	"time"

	mqtt "github.com/eclipse/paho.mqtt.golang"
)

// TestEmbedBrokerEcho 验证内嵌 broker 能启动，且 paho 客户端能连接、订阅、发布并收到回环消息。
func TestEmbedBrokerEcho(t *testing.T) {
	const (
		listenAddr = ":18830"
		brokerAddr = "tcp://127.0.0.1:18830"
	)

	broker, err := Start(listenAddr)
	if err != nil {
		t.Fatalf("启动内嵌 broker 失败: %v", err)
	}
	defer func() { _ = broker.Close() }()

	opts := mqtt.NewClientOptions().AddBroker(brokerAddr).SetClientID("test-client")
	client := mqtt.NewClient(opts)
	if token := client.Connect(); token.Wait() && token.Error() != nil {
		t.Fatalf("客户端连接失败: %v", token.Error())
	}
	defer client.Disconnect(100)

	received := make(chan string, 1)
	if token := client.Subscribe("parking/test/echo", 1, func(_ mqtt.Client, msg mqtt.Message) {
		received <- string(msg.Payload())
	}); token.Wait() && token.Error() != nil {
		t.Fatalf("订阅失败: %v", token.Error())
	}

	if token := client.Publish("parking/test/echo", 1, false, "hello-broker"); token.Wait() && token.Error() != nil {
		t.Fatalf("发布失败: %v", token.Error())
	}

	select {
	case got := <-received:
		if got != "hello-broker" {
			t.Fatalf("回环内容不符: %s", got)
		}
		t.Logf("内嵌 broker 回环成功: %s", got)
	case <-time.After(5 * time.Second):
		t.Fatal("等待回环消息超时")
	}
}