package mqtt

import (
	"MQTTLogger/config"
	"MQTTLogger/internal/csv"
	"time"

	mqtt "github.com/eclipse/paho.mqtt.golang"
	"go.uber.org/zap"
)

func NewClient(logger *zap.Logger, config *config.Config, csvHelper *csv.Helper) mqtt.Client {
	var f mqtt.MessageHandler = func(client mqtt.Client, msg mqtt.Message) {
		csvHelper.AddEntry(time.Now().UTC().Format("2006-01-02 15:04:05"), msg.Topic(), string(msg.Payload()))
	}

	opts := mqtt.NewClientOptions().AddBroker(config.URI).SetClientID("mqtt-logger")
	opts.SetKeepAlive(2 * time.Second)
	opts.SetDefaultPublishHandler(f)
	opts.SetPingTimeout(1 * time.Second)
	opts.SetConnectionNotificationHandler(func(client mqtt.Client, notification mqtt.ConnectionNotification) {
		switch n := notification.(type) {
		case mqtt.ConnectionNotificationConnected:
			logger.Info("Connected to MQTT broker")
		case mqtt.ConnectionNotificationConnecting:
			logger.Info("connecting", zap.Bool("isReconnect", n.IsReconnect), zap.Int("attempt", n.Attempt))
		case mqtt.ConnectionNotificationFailed:
			logger.Error("connection failed", zap.String("error", n.Reason.Error()))
		case mqtt.ConnectionNotificationLost:
			logger.Error("connection lost", zap.String("error", n.Reason.Error()))
		case mqtt.ConnectionNotificationBroker:
			logger.Info("broker", zap.String("name", n.Broker.String()))
		case mqtt.ConnectionNotificationBrokerFailed:
			logger.Error("broker failed", zap.String("broker", n.Broker.String()), zap.String("error", n.Reason.Error()))
		}
	})

	c := mqtt.NewClient(opts)
	if token := c.Connect(); token.Wait() && token.Error() != nil {
		logger.Fatal("error connecting to MQTT broker", zap.Error(token.Error()))
	}

	return c
}

func StartListening(logger *zap.Logger, config *config.Config, client mqtt.Client) {
	for _, topic := range config.Topics {
		if token := client.Subscribe(topic, 0, nil); token.Wait() && token.Error() != nil {
			logger.Error("error subscribing to topic", zap.String("topic", topic), zap.Error(token.Error()))
		}
	}
}