package main

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

func main() {
	cfg := loadConfig()
	app, err := newApp(cfg)
	if err != nil {
		log.Fatalf("failed to initialize app: %v", err)
	}
	defer app.close()

	server := &http.Server{
		Addr:    ":" + cfg.Port,
		Handler: app.handler(),
	}

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

	go func() {
		<-ctx.Done()
		shutdownCtx, cancel := context.WithTimeout(context.Background(), cfg.ShutdownTimeout)
		defer cancel()
		if err := server.Shutdown(shutdownCtx); err != nil {
			log.Printf("graceful shutdown failed: %v", err)
		}
	}()

	log.Printf("starting backend API on :%s", cfg.Port)
	if err := server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
		log.Fatalf("server failed: %v", err)
	}
}