package main

import (
	"context"
	"fmt"
	"os"

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

var (
	checkpointCommand     cliconfig.CheckpointValues
	checkpointDescription = `
   podman container checkpoint

   Checkpoints one or more running containers. The container name or ID can be used.
`
	_checkpointCommand = &cobra.Command{
		Use:   "checkpoint",
		Short: "Checkpoints one or more containers",
		Long:  checkpointDescription,
		RunE: func(cmd *cobra.Command, args []string) error {
			checkpointCommand.InputArgs = args
			checkpointCommand.GlobalFlags = MainGlobalOpts
			return checkpointCmd(&checkpointCommand)
		},
		Args: func(cmd *cobra.Command, args []string) error {
			return checkAllAndLatest(cmd, args, false)
		},
		Example: `podman checkpoint --keep ctrID
  podman checkpoint --all
  podman checkpoint --leave-running --latest`,
	}
)

func init() {
	checkpointCommand.Command = _checkpointCommand
	checkpointCommand.SetUsageTemplate(UsageTemplate())

	flags := checkpointCommand.Flags()
	flags.BoolVarP(&checkpointCommand.Keep, "keep", "k", false, "Keep all temporary checkpoint files")
	flags.BoolVarP(&checkpointCommand.LeaveRunning, "leave-running", "R", false, "Leave the container running after writing checkpoint to disk")
	flags.BoolVar(&checkpointCommand.TcpEstablished, "tcp-established", false, "Checkpoint a container with established TCP connections")
	flags.BoolVarP(&checkpointCommand.All, "all", "a", false, "Checkpoint all running containers")
	flags.BoolVarP(&checkpointCommand.Latest, "latest", "l", false, "Act on the latest container podman is aware of")
}

func checkpointCmd(c *cliconfig.CheckpointValues) error {
	if rootless.IsRootless() {
		return errors.New("checkpointing a container requires root")
	}

	runtime, err := libpodruntime.GetRuntime(&c.PodmanCommand)
	if err != nil {
		return errors.Wrapf(err, "could not get runtime")
	}
	defer runtime.Shutdown(false)

	options := libpod.ContainerCheckpointOptions{
		Keep:           c.Keep,
		KeepRunning:    c.LeaveRunning,
		TCPEstablished: c.TcpEstablished,
	}
	containers, lastError := getAllOrLatestContainers(&c.PodmanCommand, runtime, libpod.ContainerStateRunning, "running")

	for _, ctr := range containers {
		if err = ctr.Checkpoint(context.TODO(), options); err != nil {
			if lastError != nil {
				fmt.Fprintln(os.Stderr, lastError)
			}
			lastError = errors.Wrapf(err, "failed to checkpoint container %v", ctr.ID())
		} else {
			fmt.Println(ctr.ID())
		}
	}
	return lastError
}