package main

import (
	"embed"
	"flag"
	"io/fs"
	"log"
	"net/http"
	"os"

	"emailforwarder/backend"
)

//go:embed frontend-js/dist/*
var frontend embed.FS

func main() {
	runOnce := flag.String("run", "", "einen Umzugs-Job einmalig ausfuehren (Konto-Name oder 'all'), ohne Web-UI")
	watch := flag.Bool("watch", false, "Delta-Sync in Schleife bis Stop (Cutover-Fenster)")
	flag.Parse()

	if err := backend.LoadConfig("config.json"); err != nil {
		log.Fatalf("config: %v", err)
	}
	if err := backend.ConnectDB(); err != nil {
		log.Fatalf("database: %v", err)
	}
	if err := backend.InitAuth(); err != nil {
		log.Fatalf("auth: %v", err)
	}

	// CLI-Modus: ohne Web laufen lassen (Cronjob / Cutover).
	if *runOnce != "" {
		must(backend.RunMigration(*runOnce, *watch))
		return
	}

	dist, err := fs.Sub(frontend, "frontend-js/dist")
	if err != nil {
		log.Fatal(err)
	}

	mux := http.NewServeMux()
	mux.Handle("/static/", http.StripPrefix("/static/", http.FileServer(http.FS(dist))))
	backend.RegisterRoutes(mux)

	addr := backend.Cfg.Bind + ":" + backend.Cfg.Port
	log.Printf("Email-Forwarder listening on %s", addr)
	log.Fatal(http.ListenAndServe(addr, backend.AuthMiddleware(mux)))
}

func must(err error) {
	if err != nil {
		log.Print(err)
		os.Exit(1)
	}
}