package restic

import (
	"fmt"
	"os"
	"os/user"
	"strconv"
	"syscall"
	"time"
)

func (node *Node) fill_extra(path string, fi os.FileInfo) (err error) {
	stat, ok := fi.Sys().(*syscall.Stat_t)
	if !ok {
		return
	}

	node.ChangeTime = time.Unix(stat.Ctimespec.Unix())
	node.AccessTime = time.Unix(stat.Atimespec.Unix())
	node.UID = stat.Uid
	node.GID = stat.Gid

	// TODO: cache uid lookup
	if u, nil := user.LookupId(strconv.Itoa(int(stat.Uid))); err == nil {
		node.User = u.Username
	}

	// TODO: implement getgrnam() or use https://github.com/kless/osutil
	// if g, nil := user.LookupId(strconv.Itoa(int(stat.Uid))); err == nil {
	// 	node.User = u.Username
	// }

	node.Inode = stat.Ino

	switch node.Type {
	case "file":
		node.Size = uint64(stat.Size)
		node.Links = uint64(stat.Nlink)
	case "dir":
		// nothing to do
	case "symlink":
		node.LinkTarget, err = os.Readlink(path)
	case "dev":
		node.Device = uint64(stat.Rdev)
	case "chardev":
		node.Device = uint64(stat.Rdev)
	case "fifo":
		// nothing to do
	case "socket":
		// nothing to do
	default:
		panic(fmt.Sprintf("invalid node type %q", node.Type))
	}

	return err
}

func (node *Node) createDevAt(path string) error {
	return syscall.Mknod(path, syscall.S_IFBLK|0600, int(node.Device))
}

func (node *Node) createCharDevAt(path string) error {
	return syscall.Mknod(path, syscall.S_IFCHR|0600, int(node.Device))
}

func (node *Node) createFifoAt(path string) error {
	return syscall.Mkfifo(path, 0600)
}