// SPDX-FileCopyrightText: 2020 Ethel Morgan
//
// SPDX-License-Identifier: MIT

package main

import (
	"context"
	"flag"
	"log"

	"go.eth.moe/catbus-wakeonlan/config"
	"go.eth.moe/catbus-wakeonlan/logger"
	"go.eth.moe/catbus-wakeonlan/mqtt"
	"go.eth.moe/catbus-wakeonlan/wakeonlan"
)

var (
	configPath = flag.String("config-path", "", "path to config")
)

func main() {
	flag.Parse()

	if *configPath == "" {
		log.Fatal("must set -config-path")
	}

	log, _ := logger.FromContext(context.Background())

	config, err := config.ParseFile(*configPath)
	if err != nil {
		log.AddField("config-path", *configPath)
		log.WithError(err).Fatal("could not parse config file")
	}

	log.AddField("broker-uri", config.Broker)

	brokerOptions := mqtt.NewClientOptions()
	brokerOptions.AddBroker(config.Broker)
	brokerOptions.SetAutoReconnect(true)
	brokerOptions.SetConnectionLostHandler(func(_ mqtt.Client, err error) {
		log := log
		if err != nil {
			log = log.WithError(err)
		}
		log.Error("disconnected from MQTT broker")
	})
	brokerOptions.SetOnConnectHandler(func(broker mqtt.Client) {
		log.Info("connected to MQTT broker")

		for topic := range config.MACsByTopic {
			token := broker.Subscribe(topic, mqtt.AtLeastOnce, func(_ mqtt.Client, msg mqtt.Message) {
				if string(msg.Payload()) != "on" {
					return
				}

				mac, ok := config.MACsByTopic[msg.Topic()]
				if !ok {
					return
				}

				log.AddField("mac", mac)
				log.AddField("topic", topic)
				if err := wakeonlan.Wake(mac); err != nil {
					log.WithError(err).Error("could not send wake-on-lan packet")
					return
				}
				log.Info("sent wake-on-lan packet")
			})
			if err := token.Error(); err != nil {
				log := log.WithError(err)
				log.AddField("topic", topic)
				log.Error("could not subscribe to MQTT topic")
			}
		}
	})

	broker := mqtt.NewClient(brokerOptions)
	if token := broker.Connect(); token.Error() != nil {
		log.WithError(token.Error()).Fatal("could not connect to MQTT broker")
	}

	select {}
}