func tryDecodeSinglePod(data []byte, defaultFn defaultFunc) (parsed bool, pod *api.Pod, err error) {
	// JSON is valid YAML, so this should work for everything.
	json, err := utilyaml.ToJSON(data)
	if err != nil {
		return false, nil, err
	}
	obj, err := api.Scheme.Decode(json)
	if err != nil {
		return false, pod, err
	}
	// Check whether the object could be converted to single pod.
	if _, ok := obj.(*api.Pod); !ok {
		err = fmt.Errorf("invalid pod: %+v", obj)
		return false, pod, err
	}
	newPod := obj.(*api.Pod)
	// Apply default values and validate the pod.
	if err = defaultFn(newPod); err != nil {
		return true, pod, err
	}
	if errs := validation.ValidatePod(newPod); len(errs) > 0 {
		err = fmt.Errorf("invalid pod: %v", errs)
		return true, pod, err
	}
	return true, newPod, nil
}

func (s *SwaggerSchema) ValidateBytes(data []byte) error {
	var obj interface{}
	out, err := yaml.ToJSON(data)
	if err != nil {
		return err
	}
	data = out
	if err := json.Unmarshal(data, &obj); err != nil {
		return err
	}
	fields, ok := obj.(map[string]interface{})
	if !ok {
		return fmt.Errorf("error in unmarshaling data %s", string(data))
	}
	apiVersion := fields["apiVersion"]
	if apiVersion == nil {
		return fmt.Errorf("apiVersion not set")
	}
	kind := fields["kind"]
	if kind == nil {
		return fmt.Errorf("kind not set")
	}
	allErrs := s.ValidateObject(obj, apiVersion.(string), "", apiVersion.(string)+"."+kind.(string))
	if len(allErrs) == 1 {
		return allErrs[0]
	}
	return errors.NewAggregate(allErrs)
}

func tryDecodePodList(data []byte, defaultFn defaultFunc) (parsed bool, pods api.PodList, err error) {
	json, err := utilyaml.ToJSON(data)
	if err != nil {
		return false, api.PodList{}, err
	}
	obj, err := api.Scheme.Decode(json)
	if err != nil {
		return false, pods, err
	}
	// Check whether the object could be converted to list of pods.
	if _, ok := obj.(*api.PodList); !ok {
		err = fmt.Errorf("invalid pods list: %+v", obj)
		return false, pods, err
	}
	newPods := obj.(*api.PodList)
	// Apply default values and validate pods.
	for i := range newPods.Items {
		newPod := &newPods.Items[i]
		if err = defaultFn(newPod); err != nil {
			return true, pods, err
		}
		if errs := validation.ValidatePod(newPod); len(errs) > 0 {
			err = fmt.Errorf("invalid pod: %v", errs)
			return true, pods, err
		}
	}
	return true, *newPods, err
}

func walkJSONFiles(inDir string, fn func(name, path string, data []byte)) error {
	return filepath.Walk(inDir, func(path string, info os.FileInfo, err error) error {
		if err != nil {
			return err
		}

		if info.IsDir() && path != inDir {
			return filepath.SkipDir
		}

		file := filepath.Base(path)
		if ext := filepath.Ext(file); ext == ".json" || ext == ".yaml" {
			glog.Infof("Testing %s", path)
			data, err := ioutil.ReadFile(path)
			if err != nil {
				return err
			}
			name := strings.TrimSuffix(file, ext)

			if ext == ".yaml" {
				out, err := yaml.ToJSON(data)
				if err != nil {
					return fmt.Errorf("%s: %v", path, err)
				}
				data = out
			}

			fn(name, path, data)
		}
		return nil
	})
}

// Apply attempts to apply the changes described by Delta onto latest,
// returning an error if the changes cannot be applied cleanly.
// IsConflicting will be true if the changes overlap, otherwise a
// generic error will be returned.
func (d *Delta) Apply(latest []byte) ([]byte, error) {
	base, err := yaml.ToJSON(latest, false)
	if err != nil {
		return nil, err
	}
	changes, err := jsonpatch.CreateMergePatch(d.original, base)
	if err != nil {
		return nil, err
	}
	diff1 := make(map[string]interface{})
	if err := json.Unmarshal(d.edit, &diff1); err != nil {
		return nil, err
	}
	diff2 := make(map[string]interface{})
	if err := json.Unmarshal(changes, &diff2); err != nil {
		return nil, err
	}
	for _, fn := range d.preconditions {
		if !fn(diff1) || !fn(diff2) {
			return nil, ErrPreconditionFailed
		}
	}

	glog.V(6).Infof("Testing for conflict between:\n%s\n%s", string(d.edit), string(changes))
	if hasConflicts(diff1, diff2) {
		return nil, ErrConflict
	}
	return jsonpatch.MergePatch(base, d.edit)
}

// InfoForData creates an Info object for the given data. An error is returned
// if any of the decoding or client lookup steps fail. Name and namespace will be
// set into Info if the mapping's MetadataAccessor can retrieve them.
func (m *Mapper) InfoForData(data []byte, source string) (*Info, error) {
	json, err := yaml.ToJSON(data)
	if err != nil {
		return nil, fmt.Errorf("unable to parse %q: %v", source, err)
	}
	data = json
	version, kind, err := m.DataVersionAndKind(data)
	if err != nil {
		return nil, fmt.Errorf("unable to get type info from %q: %v", source, err)
	}
	mapping, err := m.RESTMapping(kind, version)
	if err != nil {
		return nil, fmt.Errorf("unable to recognize %q: %v", source, err)
	}
	obj, err := mapping.Codec.Decode(data)
	if err != nil {
		return nil, fmt.Errorf("unable to load %q: %v", source, err)
	}
	client, err := m.ClientForMapping(mapping)
	if err != nil {
		return nil, fmt.Errorf("unable to connect to a server to handle %q: %v", mapping.Resource, err)
	}
	name, _ := mapping.MetadataAccessor.Name(obj)
	namespace, _ := mapping.MetadataAccessor.Namespace(obj)
	resourceVersion, _ := mapping.MetadataAccessor.ResourceVersion(obj)
	return &Info{
		Mapping:   mapping,
		Client:    client,
		Namespace: namespace,
		Name:      name,

		Object:          obj,
		ResourceVersion: resourceVersion,
	}, nil
}

func (c yamlCodec) DecodeInto(data []byte, obj Object) error {
	out, err := yaml.ToJSON(data)
	if err != nil {
		return err
	}
	data = out
	return c.Codec.DecodeInto(data, obj)
}

func (c yamlCodec) Decode(data []byte) (Object, error) {
	out, err := yaml.ToJSON(data)
	if err != nil {
		return nil, err
	}
	data = out
	return c.Codec.Decode(data)
}

// NewDelta accepts two JSON or YAML documents and calculates the difference
// between them.  It returns a Delta object which can be used to resolve
// conflicts against a third version with a common parent, or an error
// if either document is in error.
func NewDelta(from, to []byte) (*Delta, error) {
	d := &Delta{}
	before, err := yaml.ToJSON(from, false)
	if err != nil {
		return nil, err
	}
	after, err := yaml.ToJSON(to, false)
	if err != nil {
		return nil, err
	}
	diff, err := jsonpatch.CreateMergePatch(before, after)
	if err != nil {
		return nil, err
	}
	glog.V(6).Infof("Patch created from:\n%s\n%s\n%s", string(before), string(after), string(diff))
	d.original = before
	d.edit = diff
	return d, nil
}

func TestReadme(t *testing.T) {
	paths := []string{
		"../README.md",
		"../examples/walkthrough/README.md",
		"../examples/iscsi/README.md",
	}

	for _, path := range paths {
		data, err := ioutil.ReadFile(path)
		if err != nil {
			t.Errorf("Unable to read file %s: %v", path, err)
			continue
		}

		matches := sampleRegexp.FindAllStringSubmatch(string(data), -1)
		if matches == nil {
			continue
		}
		for _, match := range matches {
			var content, subtype string
			for i, name := range sampleRegexp.SubexpNames() {
				if name == "type" {
					subtype = match[i]
				}
				if name == "content" && match[i] != "" {
					content = match[i]
				}
			}
			if subtype == "yaml" && subsetRegexp.FindString(content) != "" {
				t.Logf("skipping (%s): \n%s", subtype, content)
				continue
			}

			//t.Logf("testing (%s): \n%s", subtype, content)
			expectedType := &api.Pod{}
			json, err := yaml.ToJSON([]byte(content))
			if err != nil {
				t.Errorf("%s could not be converted to JSON: %v\n%s", path, err, string(content))
			}
			if err := latest.Codec.DecodeInto(json, expectedType); err != nil {
				t.Errorf("%s did not decode correctly: %v\n%s", path, err, string(content))
				continue
			}
			if errors := validateObject(expectedType); len(errors) > 0 {
				t.Errorf("%s did not validate correctly: %v", path, errors)
			}
			_, err = latest.Codec.Encode(expectedType)
			if err != nil {
				t.Errorf("Could not encode object: %v", err)
				continue
			}
		}
	}
}

func ReadYAMLFile(filename string, obj runtime.Object) error {
	data, err := ioutil.ReadFile(filename)
	if err != nil {
		return err
	}
	data, err = kyaml.ToJSON(data)
	if err != nil {
		return err
	}
	err = Codec.DecodeInto(data, obj)
	return captureSurroundingJSONForError(fmt.Sprintf("could not load config file %q due to a error: ", filename), data, err)
}

func ValidateSchema(data []byte, schema validation.Schema) error {
	if schema == nil {
		return nil
	}
	data, err := yaml.ToJSON(data)
	if err != nil {
		return fmt.Errorf("error converting to YAML: %v", err)
	}
	if err := schema.ValidateBytes(data); err != nil {
		return fmt.Errorf("error validating data: %v", err)
	}
	return nil
}

// InfoForData creates an Info object for the given data. An error is returned
// if any of the decoding or client lookup steps fail. Name and namespace will be
// set into Info if the mapping's MetadataAccessor can retrieve them.
func (m *Mapper) InfoForData(data []byte, source string) (*Info, error) {
	json, err := yaml.ToJSON(data)
	if err != nil {
		return nil, fmt.Errorf("unable to parse %q: %v", source, err)
	}
	data = json
	version, kind, err := runtime.UnstructuredJSONScheme.DataVersionAndKind(data)
	if err != nil {
		return nil, fmt.Errorf("unable to get type info from %q: %v", source, err)
	}
	if ok := registered.IsRegisteredAPIVersion(version); !ok {
		return nil, fmt.Errorf("API version %q in %q isn't supported, only supports API versions %q", version, source, registered.RegisteredVersions)
	}
	if kind == "" {
		return nil, fmt.Errorf("kind not set in %q", source)
	}
	mapping, err := m.RESTMapping(kind, version)
	if err != nil {
		return nil, fmt.Errorf("unable to recognize %q: %v", source, err)
	}
	obj, err := mapping.Codec.Decode(data)
	if err != nil {
		return nil, fmt.Errorf("unable to load %q: %v", source, err)
	}
	client, err := m.ClientForMapping(mapping)
	if err != nil {
		return nil, fmt.Errorf("unable to connect to a server to handle %q: %v", mapping.Resource, err)
	}
	name, _ := mapping.MetadataAccessor.Name(obj)
	namespace, _ := mapping.MetadataAccessor.Namespace(obj)
	resourceVersion, _ := mapping.MetadataAccessor.ResourceVersion(obj)

	var versionedObject interface{}

	if vo, _, _, err := api.Scheme.Raw().DecodeToVersionedObject(data); err == nil {
		versionedObject = vo
	}
	return &Info{
		Mapping:         mapping,
		Client:          client,
		Namespace:       namespace,
		Name:            name,
		Source:          source,
		VersionedObject: versionedObject,
		Object:          obj,
		ResourceVersion: resourceVersion,
	}, nil
}

func (s *SwaggerSchema) ValidateBytes(data []byte) error {
	var obj interface{}
	out, err := yaml.ToJSON(data)
	if err != nil {
		return err
	}
	data = out
	if err := json.Unmarshal(data, &obj); err != nil {
		return err
	}
	fields, ok := obj.(map[string]interface{})
	if !ok {
		return fmt.Errorf("error in unmarshaling data %s", string(data))
	}
	apiVersion := fields["apiVersion"].(string)
	kind := fields["kind"].(string)
	return s.ValidateObject(obj, apiVersion, "", apiVersion+"."+kind)
}

// AddObjectsFromPath loads the JSON or YAML file containing Kubernetes API resources
// and adds them to the provided ObjectRetriever.
func AddObjectsFromPath(path string, o ObjectRetriever) error {
	data, err := ioutil.ReadFile(path)
	if err != nil {
		return err
	}
	data, err = yaml.ToJSON(data)
	if err != nil {
		return err
	}
	obj, err := api.Codec.Decode(data)
	if err != nil {
		return err
	}
	if err := o.Add(obj); err != nil {
		return err
	}
	return nil
}

func TestReadme(t *testing.T) {
	paths := []struct {
		file         string
		expectedType []runtime.Object
	}{
		{"../README.md", []runtime.Object{&api.Pod{}}},
		{"../docs/user-guide/walkthrough/README.md", []runtime.Object{&api.Pod{}}},
		{"../examples/iscsi/README.md", []runtime.Object{&api.Pod{}}},
		{"../docs/user-guide/simple-yaml.md", []runtime.Object{&api.Pod{}, &api.ReplicationController{}}},
	}

	for _, path := range paths {
		data, err := ioutil.ReadFile(path.file)
		if err != nil {
			t.Errorf("Unable to read file %s: %v", path, err)
			continue
		}

		matches := sampleRegexp.FindAllStringSubmatch(string(data), -1)
		if matches == nil {
			continue
		}
		ix := 0
		for _, match := range matches {
			var content, subtype string
			for i, name := range sampleRegexp.SubexpNames() {
				if name == "type" {
					subtype = match[i]
				}
				if name == "content" && match[i] != "" {
					content = match[i]
				}
			}
			if subtype == "yaml" && subsetRegexp.FindString(content) != "" {
				t.Logf("skipping (%s): \n%s", subtype, content)
				continue
			}

			var expectedType runtime.Object
			if len(path.expectedType) == 1 {
				expectedType = path.expectedType[0]
			} else {
				expectedType = path.expectedType[ix]
				ix++
			}
			json, err := yaml.ToJSON([]byte(content))
			if err != nil {
				t.Errorf("%s could not be converted to JSON: %v\n%s", path, err, string(content))
			}
			if err := latest.Codec.DecodeInto(json, expectedType); err != nil {
				t.Errorf("%s did not decode correctly: %v\n%s", path, err, string(content))
				continue
			}
			if errors := validateObject(expectedType); len(errors) > 0 {
				t.Errorf("%s did not validate correctly: %v", path, errors)
			}
			_, err = latest.Codec.Encode(expectedType)
			if err != nil {
				t.Errorf("Could not encode object: %v", err)
				continue
			}
		}
	}
}