package main

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

const defaultAddress = ":9105"

func main() {
	address := os.Getenv("DASHBOARD_ADDR")
	if address == "" {
		address = defaultAddress
	}

	collector, err := newCPUCollector(cpuInfoPath, procStatPath)
	if err != nil {
		log.Fatalf("Не удалось запустить сборщик CPU: %v", err)
	}

	server := &http.Server{
		Addr:              address,
		Handler:           routes(collector),
		ReadHeaderTimeout: 5 * time.Second,
	}

	go func() {
		log.Printf("Proxmox CPU Dashboard запущен на http://0.0.0.0%s", address)
		if err := server.ListenAndServe(); !errors.Is(err, http.ErrServerClosed) {
			log.Fatalf("Ошибка веб-сервера: %v", err)
		}
	}()

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

	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()
	if err := server.Shutdown(ctx); err != nil {
		fmt.Fprintf(os.Stderr, "Ошибка остановки сервера: %v\n", err)
	}
}