package main

import (
	"context"
	"log"
	"net"
	"os"
	"os/signal"
	"strconv"
	"syscall"
	server "test3k/authPostman/internal"
	"test3k/authPostman/internal/config"

	"github.com/segmentio/kafka-go"
)

func main() {
	config := config.NewConfig()
	ctx, _ := context.WithCancel(context.Background())
	srv := server.NewServer(ctx, config)

	//
	signalChannel := make(chan os.Signal, 1)
	signal.Notify(signalChannel, syscall.SIGINT)
	signal.Notify(signalChannel, syscall.SIGTERM)
	defer stop(signalChannel, srv)

	// Запуск сервера
	go start(config, srv)

	//
	for {
		select {
		case <-signalChannel:
			return
		case <-ctx.Done():
			return
		}
	}
}

// Остановка сервера
func stop(signalChannel chan os.Signal, srv *server.AuthPostmanServer) {
	defer srv.GracefulStop()
	defer signal.Stop(signalChannel)

	log.Println("authPostmanServer stopping ...")
}

// Запуск сервера
func start(config *config.Config, srv *server.AuthPostmanServer) {
	connStr := net.JoinHostPort(config.Kafka.Host, strconv.Itoa(config.Kafka.Port))

	//
	log.Printf("authPostmanServer starting (listening to %s)\n", connStr)

	//
	r := kafka.NewReader(kafka.ReaderConfig{
		Topic:     "registrations",
		Brokers:   []string{connStr},
		GroupID:   "consumer-group-id",
		Partition: 0,
		MinBytes:  10e3, // 10KB
		MaxBytes:  10e6, // 10MB
	})
	defer r.Close()

	// ...
	r.SetOffset(0)

	for {
		m, err := r.ReadMessage(context.Background())
		if err != nil {
			break
		}

		log.Printf("message at offset %d: %s = %s\n", m.Offset, string(m.Key), string(m.Value))
	}
}