package main

import (
	"context"
	"fmt"
	"log"
	"net/http"
	"os"
	"os/signal"
	"syscall"
	"time"
)

func main() {
	// Create a server
	server := &http.Server{Addr: ":8080", Handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		time.Sleep(2 * time.Second) // Simulate a long-running request
		fmt.Fprintf(w, "Hello from graceful server!
")
	})}

	// Channel to listen for OS signals
	quit := make(chan os.Signal, 1)
	signal.Notify(quit, syscall.SIGINT, syscall.SIGTERM)

	// Start server in a goroutine
	go func() {
		fmt.Println("Server started on :8080")
		if err := server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
			log.Fatalf("Server failed: %v", err)
		}
	}()

	// Block until we receive our signal
	<-quit
	fmt.Println("Shutting down server...")

	// Create a context with a timeout for shutdown
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()

	// Attempt to gracefully shut down
	if err := server.Shutdown(ctx); err != nil {
		log.Fatalf("Server shutdown failed: %v", err)
	}

	fmt.Println("Server gracefully stopped.")
}