/*
Copyright 2018 Google LLC

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.
*/

// for use in tests
package executor

import (
	"bytes"
	"errors"
	"io"
	"io/ioutil"

	"github.com/GoogleContainerTools/kaniko/pkg/commands"
	"github.com/GoogleContainerTools/kaniko/pkg/dockerfile"
	v1 "github.com/google/go-containerregistry/pkg/v1"
	"github.com/google/go-containerregistry/pkg/v1/types"
)

type fakeSnapShotter struct {
	file    string
	tarPath string
}

func (f fakeSnapShotter) Init() error { return nil }
func (f fakeSnapShotter) TakeSnapshotFS() (string, error) {
	return f.tarPath, nil
}
func (f fakeSnapShotter) TakeSnapshot(_ []string, _ bool) (string, error) {
	return f.tarPath, nil
}

type MockDockerCommand struct {
	command      string
	contextFiles []string
	cacheCommand commands.DockerCommand
}

func (m MockDockerCommand) ExecuteCommand(c *v1.Config, args *dockerfile.BuildArgs) error { return nil }
func (m MockDockerCommand) String() string {
	return m.command
}
func (m MockDockerCommand) FilesToSnapshot() []string {
	return []string{"meow-snapshot-no-cache"}
}
func (m MockDockerCommand) ProvidesFilesToSnapshot() bool {
	return true
}
func (m MockDockerCommand) CacheCommand(image v1.Image) commands.DockerCommand {
	return m.cacheCommand
}
func (m MockDockerCommand) FilesUsedFromContext(c *v1.Config, args *dockerfile.BuildArgs) ([]string, error) {
	return m.contextFiles, nil
}
func (m MockDockerCommand) MetadataOnly() bool {
	return false
}
func (m MockDockerCommand) RequiresUnpackedFS() bool {
	return false
}
func (m MockDockerCommand) ShouldCacheOutput() bool {
	return true
}
func (m MockDockerCommand) ShouldDetectDeletedFiles() bool {
	return false
}

type MockCachedDockerCommand struct {
	contextFiles []string
}

func (m MockCachedDockerCommand) ExecuteCommand(c *v1.Config, args *dockerfile.BuildArgs) error {
	return nil
}
func (m MockCachedDockerCommand) String() string {
	return "meow"
}
func (m MockCachedDockerCommand) FilesToSnapshot() []string {
	return []string{"meow-snapshot"}
}
func (m MockCachedDockerCommand) ProvidesFilesToSnapshot() bool {
	return true
}
func (m MockCachedDockerCommand) CacheCommand(image v1.Image) commands.DockerCommand {
	return nil
}
func (m MockCachedDockerCommand) ShouldDetectDeletedFiles() bool {
	return false
}
func (m MockCachedDockerCommand) FilesUsedFromContext(c *v1.Config, args *dockerfile.BuildArgs) ([]string, error) {
	return m.contextFiles, nil
}
func (m MockCachedDockerCommand) MetadataOnly() bool {
	return false
}
func (m MockCachedDockerCommand) RequiresUnpackedFS() bool {
	return false
}
func (m MockCachedDockerCommand) ShouldCacheOutput() bool {
	return false
}

type fakeLayerCache struct {
	retrieve     bool
	receivedKeys []string
	img          v1.Image
	keySequence  []string
}

func (f *fakeLayerCache) RetrieveLayer(key string) (v1.Image, error) {
	f.receivedKeys = append(f.receivedKeys, key)
	if len(f.keySequence) > 0 {
		if f.keySequence[0] == key {
			f.keySequence = f.keySequence[1:]
			return f.img, nil
		}
		return f.img, errors.New("could not find layer")
	}

	if !f.retrieve {
		return nil, errors.New("could not find layer")
	}
	return f.img, nil
}

type fakeLayer struct {
	TarContent []byte
}

func (f fakeLayer) Digest() (v1.Hash, error) {
	return v1.Hash{}, nil
}
func (f fakeLayer) DiffID() (v1.Hash, error) {
	return v1.Hash{}, nil
}
func (f fakeLayer) Compressed() (io.ReadCloser, error) {
	return nil, nil
}
func (f fakeLayer) Uncompressed() (io.ReadCloser, error) {
	return ioutil.NopCloser(bytes.NewReader(f.TarContent)), nil
}
func (f fakeLayer) Size() (int64, error) {
	return 0, nil
}
func (f fakeLayer) MediaType() (types.MediaType, error) {
	return "", nil
}

type fakeImage struct {
	ImageLayers []v1.Layer
}

func (f fakeImage) Layers() ([]v1.Layer, error) {
	return f.ImageLayers, nil
}
func (f fakeImage) MediaType() (types.MediaType, error) {
	return "", nil
}
func (f fakeImage) Size() (int64, error) {
	return 0, nil
}
func (f fakeImage) ConfigName() (v1.Hash, error) {
	return v1.Hash{}, nil
}
func (f fakeImage) ConfigFile() (*v1.ConfigFile, error) {
	return &v1.ConfigFile{}, nil
}
func (f fakeImage) RawConfigFile() ([]byte, error) {
	return []byte{}, nil
}
func (f fakeImage) Digest() (v1.Hash, error) {
	return v1.Hash{}, nil
}
func (f fakeImage) Manifest() (*v1.Manifest, error) {
	return &v1.Manifest{}, nil
}
func (f fakeImage) RawManifest() ([]byte, error) {
	return []byte{}, nil
}
func (f fakeImage) LayerByDigest(v1.Hash) (v1.Layer, error) {
	return fakeLayer{}, nil
}
func (f fakeImage) LayerByDiffID(v1.Hash) (v1.Layer, error) {
	return fakeLayer{}, nil
}
