package fstestutil

import (
	"os"

	"github.com/ipfs/go-ipfs/Godeps/_workspace/src/bazil.org/fuse"
	"github.com/ipfs/go-ipfs/Godeps/_workspace/src/bazil.org/fuse/fs"
	"github.com/ipfs/go-ipfs/Godeps/_workspace/src/golang.org/x/net/context"
)

// SimpleFS is a trivial FS that just implements the Root method.
type SimpleFS struct {
	Node fs.Node
}

var _ = fs.FS(SimpleFS{})

func (f SimpleFS) Root() (fs.Node, error) {
	return f.Node, nil
}

// File can be embedded in a struct to make it look like a file.
type File struct{}

func (f File) Attr() fuse.Attr { return fuse.Attr{Mode: 0666} }

// Dir can be embedded in a struct to make it look like a directory.
type Dir struct{}

func (f Dir) Attr() fuse.Attr { return fuse.Attr{Mode: os.ModeDir | 0777} }

// ChildMap is a directory with child nodes looked up from a map.
type ChildMap map[string]fs.Node

var _ = fs.Node(ChildMap{})
var _ = fs.NodeStringLookuper(ChildMap{})

func (f ChildMap) Attr() fuse.Attr {
	return fuse.Attr{Mode: os.ModeDir | 0777}
}

func (f ChildMap) Lookup(ctx context.Context, name string) (fs.Node, error) {
	child, ok := f[name]
	if !ok {
		return nil, fuse.ENOENT
	}
	return child, nil
}
