package main

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

	"github.com/joho/godotenv"
	"vpn-panel/internal/config"
	"vpn-panel/internal/database"
	"vpn-panel/internal/handlers"
	"vpn-panel/web"
)

func main() {
	_ = godotenv.Load()

	cfg, err := config.Load()
	if err != nil {
		log.Fatalf("конфигурация: %v", err)
	}

	ctx := context.Background()
	pool, err := database.Connect(ctx, cfg.DatabaseURL)
	if err != nil {
		log.Fatalf("база данных: %v", err)
	}
	defer pool.Close()

	if err := database.Migrate(ctx, pool); err != nil {
		log.Fatalf("миграции: %v", err)
	}

	h, err := handlers.New(cfg, pool)
	if err != nil {
		log.Fatalf("handlers: %v", err)
	}

	mux := http.NewServeMux()
	mux.HandleFunc("GET /", h.Home)
	mux.HandleFunc("GET /health", h.Health)
	mux.HandleFunc("GET /register", h.RegisterAdmin)
	mux.HandleFunc("POST /register", h.RegisterAdmin)
	mux.HandleFunc("GET /login", h.Login)
	mux.HandleFunc("POST /login", h.Login)
	mux.HandleFunc("GET /logout", h.Logout)

	staticFS, err := fs.Sub(web.Static, "static")
	if err != nil {
		log.Fatal(err)
	}
	mux.Handle("GET /static/", http.StripPrefix("/static/", http.FileServer(http.FS(staticFS))))

	addr := fmt.Sprintf(":%d", cfg.AppPort)
	srv := &http.Server{
		Addr:         addr,
		Handler:      mux,
		ReadTimeout:  15 * time.Second,
		WriteTimeout: 15 * time.Second,
	}

	go func() {
		log.Printf("VPN Panel запущена на http://%s%s", cfg.AppDomain, addr)
		if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
			log.Fatal(err)
		}
	}()

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

	shutdownCtx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
	defer cancel()
	_ = srv.Shutdown(shutdownCtx)
	log.Println("остановлена")
}