package main

import (
	"context"
	"fmt"
	"io/fs"
	"log/slog"
	"net/http"
	"os"
	"os/signal"
	"syscall"
	"time"

	"energy-frontend/internal/api"
	"energy-frontend/internal/config"
)

func main() {
	cfg := config.Load()

	frontendFS, _ := fs.Sub(frontendDist, "dist")
	router := api.NewRouter(*cfg, frontendFS)

	addr := fmt.Sprintf(":%d", cfg.Server.Port)
	srv := &http.Server{
		Addr:         addr,
		Handler:      router,
		ReadTimeout:  15 * time.Second,
		WriteTimeout: 30 * time.Second,
		IdleTimeout:  60 * time.Second,
	}

	go func() {
		slog.Info("starting server", "addr", addr)
		if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
			slog.Error("server error", "error", err)
			os.Exit(1)
		}
	}()

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

	slog.Info("shutting down")
	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
	defer cancel()
	srv.Shutdown(ctx)
}