package main

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

	"tutor/internal/app"
	"tutor/internal/config"
)

func main() {
	cfg := config.LoadFromEnv()
	server := app.NewServer(cfg)

	errs := make(chan error, 1)
	go func() {
		log.Printf("starting tutor-api on %s", cfg.HTTPAddr)
		errs <- server.ListenAndServe()
	}()

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

	select {
	case sig := <-stop:
		log.Printf("received signal %s; shutting down", sig)
	case err := <-errs:
		if err != nil && !errors.Is(err, http.ErrServerClosed) {
			log.Fatalf("server error: %v", err)
		}
		return
	}

	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()
	if err := server.Shutdown(ctx); err != nil {
		log.Fatalf("shutdown error: %v", err)
	}
}