const TypeLayers = "layers"

type Exporter interface {
	Load(io.ReadCloser, io.Writer, bool) error
	// TODO: Load(net.Context, io.ReadCloser, <- chan StatusMessage) error
	Save([]string, io.Writer) error
}

type History struct {
	// Created timestamp for build point
	Created time.Time `json:"created"`
	// Author of the build point
	Author string `json:"author,omitempty"`
	// CreatedBy keeps the Dockerfile command used while building image.
	CreatedBy string `json:"created_by,omitempty"`
	// Comment is custom message set by the user when creating the image.
	Comment string `json:"comment,omitempty"`
	// EmptyLayer is set to true if this history item did not generate a
	// layer. Otherwise, the history item is associated with the next
	// layer in the RootFS section.
	EmptyLayer bool `json:"empty_layer,omitempty"`
}

type ID digest.Digest

type IDWalkFunc func(id ID) error

type Image struct {
	V1Image
	Parent     ID        `json:"parent,omitempty"`
	RootFS     *RootFS   `json:"rootfs,omitempty"`
	History    []History `json:"history,omitempty"`
	OSVersion  string    `json:"os.version,omitempty"`
	OSFeatures []string  `json:"os.features,omitempty"`
	// contains filtered or unexported fields
}

type LayerGetReleaser interface {
	Get(layer.ChainID) (layer.Layer, error)
	Release(layer.Layer) ([]layer.Metadata, error)
}

type RootFS struct {
	Type    string         `json:"type"`
	DiffIDs []layer.DiffID `json:"diff_ids,omitempty"`
}

type Store interface {
	Create(config []byte) (ID, error)
	Get(id ID) (*Image, error)
	Delete(id ID) ([]layer.Metadata, error)
	Search(partialID string) (ID, error)
	SetParent(id ID, parent ID) error
	GetParent(id ID) (ID, error)
	Children(id ID) []ID
	Map() map[ID]*Image
	Heads() map[ID]*Image
}

type StoreBackend interface {
	Walk(f IDWalkFunc) error
	Get(id ID) ([]byte, error)
	Set(data []byte) (ID, error)
	Delete(id ID) error
	SetMetadata(id ID, key string, data []byte) error
	GetMetadata(id ID, key string) ([]byte, error)
	DeleteMetadata(id ID, key string) error
}

type V1Image struct {
	// ID a unique 64 character identifier of the image
	ID string `json:"id,omitempty"`
	// Parent id of the image
	Parent string `json:"parent,omitempty"`
	// Comment user added comment
	Comment string `json:"comment,omitempty"`
	// Created timestamp when image was created
	Created time.Time `json:"created"`
	// Container is the id of the container used to commit
	Container string `json:"container,omitempty"`
	// ContainerConfig is the configuration of the container that is committed into the image
	ContainerConfig container.Config `json:"container_config,omitempty"`
	// DockerVersion specifies version on which image is built
	DockerVersion string `json:"docker_version,omitempty"`
	// Author of the image
	Author string `json:"author,omitempty"`
	// Config is the configuration of the container received from the client
	Config *container.Config `json:"config,omitempty"`
	// Architecture is the hardware that the image is build and runs on
	Architecture string `json:"architecture,omitempty"`
	// OS is the operating system used to build and run the image
	OS string `json:"os,omitempty"`
	// Size is the total size of the image including all layers it is composed of
	Size int64 `json:",omitempty"`
}