package containerd

import (
	"context"

	"github.com/containerd/containerd"
	"github.com/docker/docker/api/types"
	"github.com/docker/docker/container"
	"github.com/docker/docker/daemon/images"
	"github.com/docker/docker/image"
	"github.com/docker/docker/layer"
)

// ImageService implements daemon.ImageService
type ImageService struct {
	client *containerd.Client
}

// NewService creates a new ImageService.
func NewService(c *containerd.Client) *ImageService {
	return &ImageService{
		client: c,
	}
}

// DistributionServices return services controlling daemon image storage.
func (i *ImageService) DistributionServices() images.DistributionServices {
	return images.DistributionServices{}
}

// CountImages returns the number of images stored by ImageService
// called from info.go
func (i *ImageService) CountImages() int {
	imgs, err := i.client.ListImages(context.TODO())
	if err != nil {
		return 0
	}

	return len(imgs)
}

// Children returns the children image.IDs for a parent image.
// called from list.go to filter containers
// TODO: refactor to expose an ancestry for image.ID?
func (i *ImageService) Children(id image.ID) []image.ID {
	panic("not implemented")
}

// CreateLayer creates a filesystem layer for a container.
// called from create.go
// TODO: accept an opt struct instead of container?
func (i *ImageService) CreateLayer(container *container.Container, initFunc layer.MountInit) (layer.RWLayer, error) {
	panic("not implemented")
}

// GetLayerByID returns a layer by ID
// called from daemon.go Daemon.restore(), and Daemon.containerExport().
func (i *ImageService) GetLayerByID(cid string) (layer.RWLayer, error) {
	panic("not implemented")
}

// LayerStoreStatus returns the status for each layer store
// called from info.go
func (i *ImageService) LayerStoreStatus() [][2]string {
	return [][2]string{}
}

// GetLayerMountID returns the mount ID for a layer
// called from daemon.go Daemon.Shutdown(), and Daemon.Cleanup() (cleanup is actually continerCleanup)
// TODO: needs to be refactored to Unmount (see callers), or removed and replaced with GetLayerByID
func (i *ImageService) GetLayerMountID(cid string) (string, error) {
	panic("not implemented")
}

// Cleanup resources before the process is shutdown.
// called from daemon.go Daemon.Shutdown()
func (i *ImageService) Cleanup() error {
	return nil
}

// GraphDriverName returns the name of the graph drvier
// moved from Daemon.GraphDriverName, used by:
// - newContainer
// - to report an error in Daemon.Mount(container)
func (i *ImageService) GraphDriverName() string {
	return ""
}

// ReleaseLayer releases a layer allowing it to be removed
// called from delete.go Daemon.cleanupContainer(), and Daemon.containerExport()
func (i *ImageService) ReleaseLayer(rwlayer layer.RWLayer) error {
	panic("not implemented")
}

// LayerDiskUsage returns the number of bytes used by layer stores
// called from disk_usage.go
func (i *ImageService) LayerDiskUsage(ctx context.Context) (int64, error) {
	panic("not implemented")
}

// ImageDiskUsage returns information about image data disk usage.
func (i *ImageService) ImageDiskUsage(ctx context.Context) ([]*types.ImageSummary, error) {
	panic("not implemented")
}

// UpdateConfig values
//
// called from reload.go
func (i *ImageService) UpdateConfig(maxDownloads, maxUploads int) {
	panic("not implemented")
}

// GetLayerFolders returns the layer folders from an image RootFS.
func (i *ImageService) GetLayerFolders(img *image.Image, rwLayer layer.RWLayer) ([]string, error) {
	panic("not implemented")
}

// GetContainerLayerSize returns the real size & virtual size of the container.
func (i *ImageService) GetContainerLayerSize(containerID string) (int64, int64) {
	panic("not implemented")
}