package main

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

	"naviwatcher/internal/config"
)

const defaultConfigPath = "config.yaml"

func main() {
	configPath := flag.String("config", defaultConfigPath, "Path to config file")
	flag.Parse()

	log.Println("NaviWatcher starting...")

	cfg, err := config.LoadConfig(*configPath)
	if err != nil {
		log.Fatalf("Failed to load config: %v", err)
	}

	log.Printf("Config loaded from %s (server: %s:%d)", *configPath, cfg.Server.Host, cfg.Server.Port)

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

	sigCh := make(chan os.Signal, 1)
	signal.Notify(sigCh, syscall.SIGINT, syscall.SIGTERM)

	go func() {
		sig := <-sigCh
		log.Printf("Received signal %v, shutting down...", sig)
		cancel()
	}()

	if err := run(ctx, cfg); err != nil {
		log.Fatalf("Application error: %v", err)
	}

	log.Println("NaviWatcher stopped.")
}

func run(ctx context.Context, cfg *config.Config) error {
	// Main application loop — blocks until context is cancelled.
	// Business logic will be added in future tasks.
	<-ctx.Done()

	// Graceful shutdown delay to let goroutines finish.
	time.Sleep(100 * time.Millisecond)
	return nil
}