package mqtt

import (
	"flag"
	"fmt"

	"container/list"
	devices "homectrl/internal/devices"

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

type mqtt struct {
	client mqtt_cli.Client
	topics list.List
}

var messagePubHandler mqtt_cli.MessageHandler = func(client mqtt_cli.Client, msg mqtt_cli.Message) {
	//fmt.Printf("Received message: %s from topic: %s\n", msg.Payload(), msg.Topic())
	devices.Builder(msg.Payload())
}

var connectHandler mqtt_cli.OnConnectHandler = func(client mqtt_cli.Client) {
	fmt.Println("Connected")
}

var connectLostHandler mqtt_cli.ConnectionLostHandler = func(client mqtt_cli.Client, err error) {
	fmt.Printf("Connect lost: %v", err)
}

func sub(client mqtt_cli.Client, topic string) {
	token := client.Subscribe(topic, 1, nil)
	token.Wait()
	fmt.Printf("Subscribed to topic: %s", topic)
	receiveCount := 0
	choke := make(chan [2]string)
	num := flag.Int("num", 1, "The number of messages to publish or subscribe (default 1)")
	for receiveCount < *num {
		incoming := <-choke
		fmt.Printf("RECEIVED TOPIC: %s MESSAGE: %s\n", incoming[0], incoming[1])
		//devices.Builder2(incoming[1])
		receiveCount++
	}
}

func connect(broker string, port int) mqtt_cli.Client {
	opts := mqtt_cli.NewClientOptions()
	opts.AddBroker(fmt.Sprintf("tcp://%s:%d", broker, port))
	opts.SetClientID("go_mqtt_client")
	opts.SetUsername("emqx")
	opts.SetPassword("public")
	opts.SetDefaultPublishHandler(messagePubHandler)
	opts.OnConnect = connectHandler
	opts.OnConnectionLost = connectLostHandler
	client := mqtt_cli.NewClient(opts)
	if token := client.Connect(); token.Wait() && token.Error() != nil {
		panic(token.Error())
	}
	return client
}

func New(broker string, port int) mqtt {
	m := mqtt{client: connect(broker, port)}
	return m
}

func (m mqtt) SubTopic(topic string) {
	m.topics.PushBack(topic)
	sub(m.client, topic)
}