package main

import (
	"fmt"
	"os"
	"sort"
	"strings"
	"text/tabwriter"

	"github.com/containerd/containerd/errdefs"
	"github.com/containerd/containerd/images"
	"github.com/containerd/containerd/log"
	"github.com/containerd/containerd/progress"
	"github.com/pkg/errors"
	"github.com/urfave/cli"
)

var imageCommand = cli.Command{
	Name:  "images",
	Usage: "image management",
	Subcommands: cli.Commands{
		imagesListCommand,
		imageRemoveCommand,
		imagesSetLabelsCommand,
		imagesImportCommand,
		imagesExportCommand,
	},
}

var imagesListCommand = cli.Command{
	Name:        "list",
	Aliases:     []string{"ls"},
	Usage:       "list images known to containerd",
	ArgsUsage:   "[flags] <ref>",
	Description: `List images registered with containerd.`,
	Flags:       []cli.Flag{},
	Action: func(clicontext *cli.Context) error {
		var (
			filters     = clicontext.Args()
			ctx, cancel = appContext(clicontext)
		)
		defer cancel()

		client, err := newClient(clicontext)
		if err != nil {
			return err
		}

		imageStore := client.ImageService()
		cs := client.ContentStore()

		images, err := imageStore.List(ctx, filters...)
		if err != nil {
			return errors.Wrap(err, "failed to list images")
		}

		tw := tabwriter.NewWriter(os.Stdout, 1, 8, 1, ' ', 0)
		fmt.Fprintln(tw, "REF\tTYPE\tDIGEST\tSIZE\tLABELS\t")
		for _, image := range images {
			size, err := image.Size(ctx, cs)
			if err != nil {
				log.G(ctx).WithError(err).Errorf("failed calculating size for image %s", image.Name)
			}

			labels := "-"
			if len(image.Labels) > 0 {
				var pairs []string
				for k, v := range image.Labels {
					pairs = append(pairs, fmt.Sprintf("%v=%v", k, v))
				}
				sort.Strings(pairs)
				labels = strings.Join(pairs, ",")
			}

			fmt.Fprintf(tw, "%v\t%v\t%v\t%v\t%s\t\n",
				image.Name,
				image.Target.MediaType,
				image.Target.Digest,
				progress.Bytes(size),
				labels)
		}

		return tw.Flush()
	},
}

var imagesSetLabelsCommand = cli.Command{
	Name:        "label",
	Usage:       "Set and clear labels for an image.",
	ArgsUsage:   "[flags] <name> [<key>=<value>, ...]",
	Description: "Set and clear labels for an image.",
	Flags:       []cli.Flag{},
	Action: func(clicontext *cli.Context) error {
		var (
			ctx, cancel  = appContext(clicontext)
			name, labels = objectWithLabelArgs(clicontext)
		)
		defer cancel()

		client, err := newClient(clicontext)
		if err != nil {
			return err
		}

		if name == "" {
			return errors.New("please specify an image")
		}

		var (
			is         = client.ImageService()
			fieldpaths []string
		)

		for k := range labels {
			fieldpaths = append(fieldpaths, strings.Join([]string{"labels", k}, "."))
		}

		image := images.Image{
			Name:   name,
			Labels: labels,
		}

		updated, err := is.Update(ctx, image, fieldpaths...)
		if err != nil {
			return err
		}

		var labelStrings []string
		for k, v := range updated.Labels {
			labelStrings = append(labelStrings, fmt.Sprintf("%s=%s", k, v))
		}

		fmt.Println(strings.Join(labelStrings, ","))

		return nil
	},
}

var imageRemoveCommand = cli.Command{
	Name:        "remove",
	Aliases:     []string{"rm"},
	Usage:       "Remove one or more images by reference.",
	ArgsUsage:   "[flags] <ref> [<ref>, ...]",
	Description: `Remove one or more images by reference.`,
	Flags:       []cli.Flag{},
	Action: func(clicontext *cli.Context) error {
		var (
			exitErr error
		)
		ctx, cancel := appContext(clicontext)
		defer cancel()

		client, err := newClient(clicontext)
		if err != nil {
			return err
		}

		imageStore := client.ImageService()

		for _, target := range clicontext.Args() {
			if err := imageStore.Delete(ctx, target); err != nil {
				if !errdefs.IsNotFound(err) {
					if exitErr == nil {
						exitErr = errors.Wrapf(err, "unable to delete %v", target)
					}
					log.G(ctx).WithError(err).Errorf("unable to delete %v", target)
					continue
				}
			}

			fmt.Println(target)
		}

		return exitErr
	},
}