package main

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

	"cmr-backend/internal/app"
)

func main() {
	ctx := context.Background()

	cfg, err := app.LoadConfigFromEnv()
	if err != nil {
		slog.Error("load config failed", "error", err)
		os.Exit(1)
	}

	application, err := app.New(ctx, cfg)
	if err != nil {
		slog.Error("create app failed", "error", err)
		os.Exit(1)
	}
	defer application.Close()

	server := &http.Server{
		Addr:              cfg.HTTPAddr,
		Handler:           application.Router(),
		ReadHeaderTimeout: 5 * time.Second,
	}

	go func() {
		slog.Info("api server started", "addr", cfg.HTTPAddr)
		if err := server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
			slog.Error("server stopped unexpectedly", "error", err)
			os.Exit(1)
		}
	}()

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

	shutdownCtx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
	defer cancel()
	if err := server.Shutdown(shutdownCtx); err != nil {
		slog.Error("graceful shutdown failed", "error", err)
		os.Exit(1)
	}
}
