/*
Copyright 2017 The Kubernetes Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package temptest

import (
	"errors"
	"fmt"
	"io"

	"k8s.io/utils/temp"
)

// FakeDir implements a Directory that is not backed on the
// filesystem. This is useful for testing since the created "files" are
// simple bytes.Buffer that can be inspected.
type FakeDir struct {
	Files   map[string]*FakeFile
	Deleted bool
}

var _ temp.Directory = &FakeDir{}

// NewFile returns a new FakeFile if the filename doesn't exist already.
// This function will fail if the directory has already been deleted.
func (d *FakeDir) NewFile(name string) (io.WriteCloser, error) {
	if d.Deleted {
		return nil, errors.New("can't create file in deleted FakeDir")
	}
	if d.Files == nil {
		d.Files = map[string]*FakeFile{}
	}
	f := d.Files[name]
	if f != nil {
		return nil, fmt.Errorf(
			"FakeDir already has file named %q",
			name,
		)
	}
	f = &FakeFile{}
	d.Files[name] = f
	return f, nil
}

// Delete doesn't remove anything, but records that the directory has
// been deleted.
func (d *FakeDir) Delete() error {
	if d.Deleted {
		return errors.New("failed to re-delete FakeDir")
	}
	d.Deleted = true
	return nil
}