package container

import (
	"fmt"
	"io"

	"github.com/Sirupsen/logrus"
	"github.com/docker/cli/cli"
	"github.com/docker/cli/cli/command"
	"github.com/docker/cli/opts"
	"github.com/docker/docker/api/types"
	apiclient "github.com/docker/docker/client"
	"github.com/docker/docker/pkg/promise"
	"github.com/spf13/cobra"
	"golang.org/x/net/context"
)

type execOptions struct {
	detachKeys  string
	interactive bool
	tty         bool
	detach      bool
	user        string
	privileged  bool
	env         *opts.ListOpts
}

func newExecOptions() *execOptions {
	var values []string
	return &execOptions{
		env: opts.NewListOptsRef(&values, opts.ValidateEnv),
	}
}

// NewExecCommand creates a new cobra.Command for `docker exec`
func NewExecCommand(dockerCli *command.DockerCli) *cobra.Command {
	options := newExecOptions()

	cmd := &cobra.Command{
		Use:   "exec [OPTIONS] CONTAINER COMMAND [ARG...]",
		Short: "Run a command in a running container",
		Args:  cli.RequiresMinArgs(2),
		RunE: func(cmd *cobra.Command, args []string) error {
			container := args[0]
			execCmd := args[1:]
			return runExec(dockerCli, options, container, execCmd)
		},
	}

	flags := cmd.Flags()
	flags.SetInterspersed(false)

	flags.StringVarP(&options.detachKeys, "detach-keys", "", "", "Override the key sequence for detaching a container")
	flags.BoolVarP(&options.interactive, "interactive", "i", false, "Keep STDIN open even if not attached")
	flags.BoolVarP(&options.tty, "tty", "t", false, "Allocate a pseudo-TTY")
	flags.BoolVarP(&options.detach, "detach", "d", false, "Detached mode: run command in the background")
	flags.StringVarP(&options.user, "user", "u", "", "Username or UID (format: <name|uid>[:<group|gid>])")
	flags.BoolVarP(&options.privileged, "privileged", "", false, "Give extended privileges to the command")
	flags.VarP(options.env, "env", "e", "Set environment variables")
	flags.SetAnnotation("env", "version", []string{"1.25"})

	return cmd
}

// nolint: gocyclo
func runExec(dockerCli *command.DockerCli, options *execOptions, container string, execCmd []string) error {
	execConfig, err := parseExec(options, execCmd)
	// just in case the ParseExec does not exit
	if container == "" || err != nil {
		return cli.StatusError{StatusCode: 1}
	}

	if options.detachKeys != "" {
		dockerCli.ConfigFile().DetachKeys = options.detachKeys
	}

	// Send client escape keys
	execConfig.DetachKeys = dockerCli.ConfigFile().DetachKeys

	ctx := context.Background()
	client := dockerCli.Client()

	// We need to check the tty _before_ we do the ContainerExecCreate, because
	// otherwise if we error out we will leak execIDs on the server (and
	// there's no easy way to clean those up). But also in order to make "not
	// exist" errors take precedence we do a dummy inspect first.
	if _, err := client.ContainerInspect(ctx, container); err != nil {
		return err
	}
	if !execConfig.Detach {
		if err := dockerCli.In().CheckTty(execConfig.AttachStdin, execConfig.Tty); err != nil {
			return err
		}
	}

	response, err := client.ContainerExecCreate(ctx, container, *execConfig)
	if err != nil {
		return err
	}

	execID := response.ID
	if execID == "" {
		fmt.Fprintln(dockerCli.Out(), "exec ID empty")
		return nil
	}

	// Temp struct for execStart so that we don't need to transfer all the execConfig.
	if execConfig.Detach {
		execStartCheck := types.ExecStartCheck{
			Detach: execConfig.Detach,
			Tty:    execConfig.Tty,
		}

		if err := client.ContainerExecStart(ctx, execID, execStartCheck); err != nil {
			return err
		}
		// For now don't print this - wait for when we support exec wait()
		// fmt.Fprintf(dockerCli.Out(), "%s\n", execID)
		return nil
	}

	// Interactive exec requested.
	var (
		out, stderr io.Writer
		in          io.ReadCloser
		errCh       chan error
	)

	if execConfig.AttachStdin {
		in = dockerCli.In()
	}
	if execConfig.AttachStdout {
		out = dockerCli.Out()
	}
	if execConfig.AttachStderr {
		if execConfig.Tty {
			stderr = dockerCli.Out()
		} else {
			stderr = dockerCli.Err()
		}
	}

	resp, err := client.ContainerExecAttach(ctx, execID, *execConfig)
	if err != nil {
		return err
	}
	defer resp.Close()
	errCh = promise.Go(func() error {
		return holdHijackedConnection(ctx, dockerCli, execConfig.Tty, in, out, stderr, resp)
	})

	if execConfig.Tty && dockerCli.In().IsTerminal() {
		if err := MonitorTtySize(ctx, dockerCli, execID, true); err != nil {
			fmt.Fprintln(dockerCli.Err(), "Error monitoring TTY size:", err)
		}
	}

	if err := <-errCh; err != nil {
		logrus.Debugf("Error hijack: %s", err)
		return err
	}

	var status int
	if _, status, err = getExecExitCode(ctx, client, execID); err != nil {
		return err
	}

	if status != 0 {
		return cli.StatusError{StatusCode: status}
	}

	return nil
}

// getExecExitCode perform an inspect on the exec command. It returns
// the running state and the exit code.
func getExecExitCode(ctx context.Context, client apiclient.ContainerAPIClient, execID string) (bool, int, error) {
	resp, err := client.ContainerExecInspect(ctx, execID)
	if err != nil {
		// If we can't connect, then the daemon probably died.
		if !apiclient.IsErrConnectionFailed(err) {
			return false, -1, err
		}
		return false, -1, nil
	}

	return resp.Running, resp.ExitCode, nil
}

// parseExec parses the specified args for the specified command and generates
// an ExecConfig from it.
func parseExec(opts *execOptions, execCmd []string) (*types.ExecConfig, error) {
	execConfig := &types.ExecConfig{
		User:       opts.user,
		Privileged: opts.privileged,
		Tty:        opts.tty,
		Cmd:        execCmd,
		Detach:     opts.detach,
	}

	// If -d is not set, attach to everything by default
	if !opts.detach {
		execConfig.AttachStdout = true
		execConfig.AttachStderr = true
		if opts.interactive {
			execConfig.AttachStdin = true
		}
	}

	if opts.env != nil {
		execConfig.Env = opts.env.GetAll()
	}

	return execConfig, nil
}