package main

import (
	"context"
	"encoding/json"
	"strings"

	"github.com/containers/libpod/cmd/podman/cliconfig"
	"github.com/containers/libpod/cmd/podman/formats"
	"github.com/containers/libpod/cmd/podman/shared"
	"github.com/containers/libpod/libpod/adapter"
	cc "github.com/containers/libpod/pkg/spec"
	"github.com/containers/libpod/pkg/util"
	"github.com/pkg/errors"
	"github.com/spf13/cobra"
)

const (
	inspectTypeContainer = "container"
	inspectTypeImage     = "image"
	inspectAll           = "all"
)

var (
	inspectCommand cliconfig.InspectValues

	inspectDescription = "This displays the low-level information on containers and images identified by name or ID. By default, this will render all results in a JSON array. If the container and image have the same name, this will return container JSON for unspecified type."
	_inspectCommand    = &cobra.Command{
		Use:   "inspect",
		Short: "Display the configuration of a container or image",
		Long:  inspectDescription,
		RunE: func(cmd *cobra.Command, args []string) error {
			inspectCommand.InputArgs = args
			inspectCommand.GlobalFlags = MainGlobalOpts
			return inspectCmd(&inspectCommand)
		},
		Example: `podman inspect alpine
  podman inspect --format "imageId: {{.Id}} size: {{.Size}}" alpine
  podman inspect --format "image: {{.ImageName}} driver: {{.Driver}}" myctr`,
	}
)

func init() {
	inspectCommand.Command = _inspectCommand
	inspectCommand.SetUsageTemplate(UsageTemplate())
	flags := inspectCommand.Flags()
	flags.StringVarP(&inspectCommand.TypeObject, "type", "t", inspectAll, "Return JSON for specified type, (e.g image, container or task)")
	flags.StringVarP(&inspectCommand.Format, "format", "f", "", "Change the output format to a Go template")
	flags.BoolVarP(&inspectCommand.Latest, "latest", "l", false, "Act on the latest container podman is aware of if the type is a container")
	flags.BoolVarP(&inspectCommand.Size, "size", "s", false, "Display total file size if the type is container")

}

func inspectCmd(c *cliconfig.InspectValues) error {
	args := c.InputArgs
	inspectType := c.TypeObject
	latestContainer := c.Latest
	if len(args) == 0 && !latestContainer {
		return errors.Errorf("container or image name must be specified: podman inspect [options [...]] name")
	}

	if len(args) > 0 && latestContainer {
		return errors.Errorf("you cannot provide additional arguments with --latest")
	}

	runtime, err := adapter.GetRuntime(&c.PodmanCommand)
	if err != nil {
		return errors.Wrapf(err, "error creating libpod runtime")
	}
	defer runtime.Shutdown(false)

	if !util.StringInSlice(inspectType, []string{inspectTypeContainer, inspectTypeImage, inspectAll}) {
		return errors.Errorf("the only recognized types are %q, %q, and %q", inspectTypeContainer, inspectTypeImage, inspectAll)
	}

	outputFormat := c.Format
	if strings.Contains(outputFormat, "{{.Id}}") {
		outputFormat = strings.Replace(outputFormat, "{{.Id}}", formats.IDString, -1)
	}
	if latestContainer {
		lc, err := runtime.GetLatestContainer()
		if err != nil {
			return err
		}
		args = append(args, lc.ID())
		inspectType = inspectTypeContainer
	}

	inspectedObjects, iterateErr := iterateInput(getContext(), c.Size, args, runtime, inspectType)
	if iterateErr != nil {
		return iterateErr
	}

	var out formats.Writer
	if outputFormat != "" && outputFormat != formats.JSONString {
		//template
		out = formats.StdoutTemplateArray{Output: inspectedObjects, Template: outputFormat}
	} else {
		// default is json output
		out = formats.JSONStructArray{Output: inspectedObjects}
	}

	return formats.Writer(out).Out()
}

// func iterateInput iterates the images|containers the user has requested and returns the inspect data and error
func iterateInput(ctx context.Context, size bool, args []string, runtime *adapter.LocalRuntime, inspectType string) ([]interface{}, error) {
	var (
		data           interface{}
		inspectedItems []interface{}
		inspectError   error
	)

	for _, input := range args {
		switch inspectType {
		case inspectTypeContainer:
			ctr, err := runtime.LookupContainer(input)
			if err != nil {
				inspectError = errors.Wrapf(err, "error looking up container %q", input)
				break
			}
			libpodInspectData, err := ctr.Inspect(size)
			if err != nil {
				inspectError = errors.Wrapf(err, "error getting libpod container inspect data %s", ctr.ID())
				break
			}
			artifact, err := getArtifact(ctr)
			if inspectError != nil {
				inspectError = err
				break
			}
			data, err = shared.GetCtrInspectInfo(ctr.Config(), libpodInspectData, artifact)
			if err != nil {
				inspectError = errors.Wrapf(err, "error parsing container data %q", ctr.ID())
				break
			}
		case inspectTypeImage:
			image, err := runtime.NewImageFromLocal(input)
			if err != nil {
				inspectError = errors.Wrapf(err, "error getting image %q", input)
				break
			}
			data, err = image.Inspect(ctx)
			if err != nil {
				inspectError = errors.Wrapf(err, "error parsing image data %q", image.ID())
				break
			}
		case inspectAll:
			ctr, err := runtime.LookupContainer(input)
			if err != nil {
				image, err := runtime.NewImageFromLocal(input)
				if err != nil {
					inspectError = errors.Wrapf(err, "error getting image %q", input)
					break
				}
				data, err = image.Inspect(ctx)
				if err != nil {
					inspectError = errors.Wrapf(err, "error parsing image data %q", image.ID())
					break
				}
			} else {
				libpodInspectData, err := ctr.Inspect(size)
				if err != nil {
					inspectError = errors.Wrapf(err, "error getting libpod container inspect data %s", ctr.ID())
					break
				}
				artifact, inspectError := getArtifact(ctr)
				if inspectError != nil {
					inspectError = err
					break
				}
				data, err = shared.GetCtrInspectInfo(ctr.Config(), libpodInspectData, artifact)
				if err != nil {
					inspectError = errors.Wrapf(err, "error parsing container data %s", ctr.ID())
					break
				}
			}
		}
		if inspectError == nil {
			inspectedItems = append(inspectedItems, data)
		}
	}
	return inspectedItems, inspectError
}

func getArtifact(ctr *adapter.Container) (*cc.CreateConfig, error) {
	var createArtifact cc.CreateConfig
	artifact, err := ctr.GetArtifact("create-config")
	if err != nil {
		return nil, err
	}
	if err := json.Unmarshal(artifact, &createArtifact); err != nil {
		return nil, err
	}
	return &createArtifact, nil
}