package main

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

	"arcline-email/config"
)

func main() {
	cfgPath := flag.String("config", "arcline-email.toml", "path to config file")
	flag.Parse()

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

	logger := newLogger(cfg.Logging)
	slog.SetDefault(logger)

	slog.Info("arcline-email starting", "hostname", cfg.Server.Hostname)

	// TODO: initialize and start servers (SMTP, IMAP)

	ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
	defer stop()

	<-ctx.Done()
	slog.Info("shutdown signal received")
	stop() // release signal resources before shutdown

	shutdownCtx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
	defer cancel()

	// TODO: call server.Shutdown(shutdownCtx) for each listener
	_ = shutdownCtx

	slog.Info("shutdown complete")
}

func newLogger(cfg config.LoggingConfig) *slog.Logger {
	var level slog.Level
	if err := level.UnmarshalText([]byte(cfg.Level)); err != nil {
		level = slog.LevelInfo
	}

	opts := &slog.HandlerOptions{Level: level}

	if cfg.Format == "text" {
		return slog.New(slog.NewTextHandler(os.Stdout, opts))
	}
	return slog.New(slog.NewJSONHandler(os.Stdout, opts))
}