/*
This is the authfs daemon. It stores the user database and client
sessions, and serves a 9P filesystem for managing them.

User data (usernames and password hashes) are stored on disk. Sessions
are stored in memory.
*/
package main

import (
	"flag"
	"io"
	"log"
	"net"
	"os"

	"github.com/Harvey-OS/ninep/pkg/debugfs"
	p9 "github.com/Harvey-OS/ninep/protocol"
)

var (
	root  = flag.String("root", ".", "root directory")
	ntype = flag.String("net", "unix", "network type: {tcp, unix}")
	naddr = flag.String("addr", "authfs.sock", "network address")
	debug = flag.Bool("debug", false, "print debug messages")

	outlog = log.New(os.Stdout, "authfs [info]: ", log.LstdFlags)
	errlog = log.New(os.Stderr, "authfs [error]: ", log.LstdFlags|log.Lshortfile)
)

func main() {
	flag.Parse()

	sock, err := net.Listen(*ntype, *naddr)
	if err != nil {
		errlog.Fatal(err)
	}
	defer logClose(sock, errlog)

	fs, err := NewAuthfs(*root)
	if err != nil {
		errlog.Fatal(err)
	}
	defer fs.Close()

	nsCreator := func() p9.NineServer {
		if *debug {
			return &debugfs.DebugFileServer{fs}
		} else {
			return fs
		}
	}
	ln, err := p9.NewListener(nsCreator, func(l *p9.Listener) error {
		l.Trace = func(format string, a ...any) {
			outlog.Printf(format, a...)
		}
		return nil
	})
	if err != nil {
		errlog.Fatal(err)
	}
	if err := ln.Serve(sock); err != nil {
		errlog.Fatal(err)
	}
}

func logClose(c io.Closer, l *log.Logger) {
	if err := c.Close(); err != nil {
		l.Println(err)
	}
}