package main

import (
	"fmt"
	"os"
	"strings"

	"github.com/containers/libpod/cmd/podman/cliconfig"
	"github.com/containers/libpod/cmd/podman/libpodruntime"
	"github.com/containers/libpod/cmd/podman/shared"
	"github.com/containers/libpod/libpod"
	"github.com/containers/libpod/pkg/rootless"
	"github.com/pkg/errors"
	"github.com/sirupsen/logrus"
	"github.com/spf13/cobra"
)

var (
	// Kernel namespaces shared by default within a pod
	DefaultKernelNamespaces = "cgroup,ipc,net,uts"
	podCreateCommand        cliconfig.PodCreateValues

	podCreateDescription = "Creates a new empty pod. The pod ID is then" +
		" printed to stdout. You can then start it at any time with the" +
		" podman pod start <pod_id> command. The pod will be created with the" +
		" initial state 'created'."

	_podCreateCommand = &cobra.Command{
		Use:   "create",
		Short: "Create a new empty pod",
		Long:  podCreateDescription,
		RunE: func(cmd *cobra.Command, args []string) error {
			podCreateCommand.InputArgs = args
			podCreateCommand.GlobalFlags = MainGlobalOpts
			return podCreateCmd(&podCreateCommand)
		},
	}
)

func init() {
	podCreateCommand.Command = _podCreateCommand
	flags := podCreateCommand.Flags()
	flags.SetInterspersed(false)

	flags.StringVar(&podCreateCommand.CgroupParent, "cgroup-parent", "", "Set parent cgroup for the pod")
	flags.BoolVar(&podCreateCommand.Infra, "infra", true, "Create an infra container associated with the pod to share namespaces with")
	flags.StringVar(&podCreateCommand.InfraImage, "infra-image", libpod.DefaultInfraImage, "The image of the infra container to associate with the pod")
	flags.StringVar(&podCreateCommand.InfraCommand, "infra-command", libpod.DefaultInfraCommand, "The command to run on the infra container when the pod is started")
	flags.StringSliceVar(&podCreateCommand.LabelFile, "label-file", []string{}, "Read in a line delimited file of labels")
	flags.StringSliceVarP(&podCreateCommand.Labels, "label", "l", []string{}, "Set metadata on pod (default [])")
	flags.StringVarP(&podCreateCommand.Name, "name", "n", "", "Assign a name to the pod")
	flags.StringVar(&podCreateCommand.PodIDFile, "pod-id-file", "", "Write the pod ID to the file")
	flags.StringSliceVarP(&podCreateCommand.Publish, "publish", "p", []string{}, "Publish a container's port, or a range of ports, to the host (default [])")
	flags.StringVar(&podCreateCommand.Share, "share", DefaultKernelNamespaces, "A comma delimited list of kernel namespaces the pod will share")

}

func podCreateCmd(c *cliconfig.PodCreateValues) error {
	var options []libpod.PodCreateOption
	var err error

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

	var podIdFile *os.File
	if c.Flag("pod-id-file").Changed && os.Geteuid() == 0 {
		podIdFile, err = libpod.OpenExclusiveFile(c.PodIDFile)
		if err != nil && os.IsExist(err) {
			return errors.Errorf("pod id file exists. Ensure another pod is not using it or delete %s", c.PodIDFile)
		}
		if err != nil {
			return errors.Errorf("error opening pod-id-file %s", c.PodIDFile)
		}
		defer podIdFile.Close()
		defer podIdFile.Sync()
	}

	if len(c.Publish) > 0 {
		if !c.Infra {
			return errors.Errorf("you must have an infra container to publish port bindings to the host")
		}
		if rootless.IsRootless() {
			return errors.Errorf("rootless networking does not allow port binding to the host")
		}
	}

	if !c.Infra && c.Flag("share").Changed && c.Share != "none" && c.Share != "" {
		return errors.Errorf("You cannot share kernel namespaces on the pod level without an infra container")
	}

	if c.Flag("cgroup-parent").Changed {
		options = append(options, libpod.WithPodCgroupParent(c.CgroupParent))
	}

	labels, err := getAllLabels(c.LabelFile, c.Labels)
	if err != nil {
		return errors.Wrapf(err, "unable to process labels")
	}
	if len(labels) != 0 {
		options = append(options, libpod.WithPodLabels(labels))
	}

	if c.Flag("name").Changed {
		options = append(options, libpod.WithPodName(c.Name))
	}

	if c.Infra {
		options = append(options, libpod.WithInfraContainer())
		nsOptions, err := shared.GetNamespaceOptions(strings.Split(c.Share, ","))
		if err != nil {
			return err
		}
		options = append(options, nsOptions...)
	}

	if len(c.Publish) > 0 {
		portBindings, err := shared.CreatePortBindings(c.Publish)
		if err != nil {
			return err
		}
		options = append(options, libpod.WithInfraContainerPorts(portBindings))

	}
	// always have containers use pod cgroups
	// User Opt out is not yet supported
	options = append(options, libpod.WithPodCgroups())

	ctx := getContext()
	pod, err := runtime.NewPod(ctx, options...)
	if err != nil {
		return err
	}

	if podIdFile != nil {
		_, err = podIdFile.WriteString(pod.ID())
		if err != nil {
			logrus.Error(err)
		}
	}

	fmt.Printf("%s\n", pod.ID())

	return nil
}