package main

import (
	"context"
	"flag"
	"log/slog"
	"os"
	"os/signal"
	"syscall"

	"zeromesh/internal/config"
	"zeromesh/internal/vl1"
)

func main() {
	cfgPath := flag.String("config", "config.yaml", "config file path")
	flag.Parse()

	cfg, err := config.Load(*cfgPath)
	if err != nil {
		slog.Error("load config", "err", err)
		os.Exit(1)
	}

	logger := slog.New(slog.NewTextHandler(os.Stderr, &slog.HandlerOptions{Level: slog.LevelInfo}))
	slog.SetDefault(logger)

	transport, err := vl1.NewTransport(cfg.Relay.ListenPort, logger)
	if err != nil {
		slog.Error("init relay transport", "err", err)
		os.Exit(1)
	}

	slog.Info("relay started",
		"realm", cfg.Relay.Realm,
		"port", transport.Port(),
	)

	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	go func() {
		buf := make([]byte, vl1.MaxPacketSize)
		for {
			n, addr, err := transport.ReadFrom(buf)
			if err != nil {
				if ctx.Err() != nil {
					return
				}
				slog.Error("relay read", "err", err)
				continue
			}
			logger.Debug("relay packet", "from", addr, "len", n)
		}
	}()

	quit := make(chan os.Signal, 1)
	signal.Notify(quit, syscall.SIGINT, syscall.SIGTERM)
	<-quit
	cancel()
	transport.Close()
}