package command

import (
	"fmt"
	"strings"
	"time"

	"github.com/hashicorp/vault/api"
	"github.com/mitchellh/cli"
	"github.com/posener/complete"
)

var _ cli.Command = (*TokenRenewCommand)(nil)
var _ cli.CommandAutocomplete = (*TokenRenewCommand)(nil)

type TokenRenewCommand struct {
	*BaseCommand

	flagIncrement time.Duration
}

func (c *TokenRenewCommand) Synopsis() string {
	return "Renew a token lease"
}

func (c *TokenRenewCommand) Help() string {
	helpText := `
Usage: vault token renew [options] [TOKEN]

  Renews a token's lease, extending the amount of time it can be used. If a
  TOKEN is not provided, the locally authenticated token is used. Lease renewal
  will fail if the token is not renewable, the token has already been revoked,
  or if the token has already reached its maximum TTL.

  Renew a token (this uses the /auth/token/renew endpoint and permission):

      $ vault token renew 96ddf4bc-d217-f3ba-f9bd-017055595017

  Renew the currently authenticated token (this uses the /auth/token/renew-self
  endpoint and permission):

      $ vault token renew

  Renew a token requesting a specific increment value:

      $ vault token renew -increment=30m 96ddf4bc-d217-f3ba-f9bd-017055595017

  For a full list of examples, please see the documentation.

` + c.Flags().Help()

	return strings.TrimSpace(helpText)
}

func (c *TokenRenewCommand) Flags() *FlagSets {
	set := c.flagSet(FlagSetHTTP | FlagSetOutputFormat)
	f := set.NewFlagSet("Command Options")

	f.DurationVar(&DurationVar{
		Name:       "increment",
		Aliases:    []string{"i"},
		Target:     &c.flagIncrement,
		Default:    0,
		EnvVar:     "",
		Completion: complete.PredictAnything,
		Usage: "Request a specific increment for renewal. Vault is not required " +
			"to honor this request. If not supplied, Vault will use the default " +
			"TTL. This is specified as a numeric string with suffix like \"30s\" " +
			"or \"5m\".",
	})

	return set
}

func (c *TokenRenewCommand) AutocompleteArgs() complete.Predictor {
	return c.PredictVaultFiles()
}

func (c *TokenRenewCommand) AutocompleteFlags() complete.Flags {
	return c.Flags().Completions()
}

func (c *TokenRenewCommand) Run(args []string) int {
	f := c.Flags()

	if err := f.Parse(args); err != nil {
		c.UI.Error(err.Error())
		return 1
	}

	token := ""
	increment := c.flagIncrement

	args = f.Args()
	switch len(args) {
	case 0:
		// Use the local token
	case 1:
		token = strings.TrimSpace(args[0])
	case 2:
		// TODO: remove in 0.9.0 - backwards compat
		c.UI.Warn("Specifying increment as a second argument is deprecated. " +
			"Please use -increment instead.")

		token = strings.TrimSpace(args[0])
		parsed, err := time.ParseDuration(appendDurationSuffix(args[1]))
		if err != nil {
			c.UI.Error(fmt.Sprintf("Invalid increment: %s", err))
			return 1
		}
		increment = parsed
	default:
		c.UI.Error(fmt.Sprintf("Too many arguments (expected 1, got %d)", len(args)))
		return 1
	}

	client, err := c.Client()
	if err != nil {
		c.UI.Error(err.Error())
		return 2
	}

	var secret *api.Secret
	inc := truncateToSeconds(increment)
	if token == "" {
		secret, err = client.Auth().Token().RenewSelf(inc)
	} else {
		secret, err = client.Auth().Token().Renew(token, inc)
	}
	if err != nil {
		c.UI.Error(fmt.Sprintf("Error renewing token: %s", err))
		return 2
	}

	return OutputSecret(c.UI, secret)
}