package command

import (
	"flag"
	"fmt"
	"strconv"
	"strings"
	"time"

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

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

type AuthTuneCommand struct {
	*BaseCommand

	flagAuditNonHMACRequestKeys  []string
	flagAuditNonHMACResponseKeys []string
	flagDefaultLeaseTTL          time.Duration
	flagDescription              string
	flagListingVisibility        string
	flagMaxLeaseTTL              time.Duration
	flagOptions                  map[string]string
	flagTokenType                string
	flagVersion                  int
}

func (c *AuthTuneCommand) Synopsis() string {
	return "Tunes an auth method configuration"
}

func (c *AuthTuneCommand) Help() string {
	helpText := `
Usage: vault auth tune [options] PATH

  Tunes the configuration options for the auth method at the given PATH. The
  argument corresponds to the PATH where the auth method is enabled, not the
  TYPE!

  Tune the default lease for the github auth method:

      $ vault auth tune -default-lease-ttl=72h github/

` + c.Flags().Help()

	return strings.TrimSpace(helpText)
}

func (c *AuthTuneCommand) Flags() *FlagSets {
	set := c.flagSet(FlagSetHTTP)

	f := set.NewFlagSet("Command Options")

	f.StringSliceVar(&StringSliceVar{
		Name:   flagNameAuditNonHMACRequestKeys,
		Target: &c.flagAuditNonHMACRequestKeys,
		Usage: "Comma-separated string or list of keys that will not be HMAC'd by audit" +
			"devices in the request data object.",
	})

	f.StringSliceVar(&StringSliceVar{
		Name:   flagNameAuditNonHMACResponseKeys,
		Target: &c.flagAuditNonHMACResponseKeys,
		Usage: "Comma-separated string or list of keys that will not be HMAC'd by audit" +
			"devices in the response data object.",
	})

	f.DurationVar(&DurationVar{
		Name:       "default-lease-ttl",
		Target:     &c.flagDefaultLeaseTTL,
		Default:    0,
		EnvVar:     "",
		Completion: complete.PredictAnything,
		Usage: "The default lease TTL for this auth method. If unspecified, this " +
			"defaults to the Vault server's globally configured default lease TTL, " +
			"or a previously configured value for the auth method.",
	})

	f.StringVar(&StringVar{
		Name:   flagNameDescription,
		Target: &c.flagDescription,
		Usage: "Human-friendly description of the this auth method. This overrides" +
			"the current stored value, if any.",
	})

	f.StringVar(&StringVar{
		Name:   flagNameListingVisibility,
		Target: &c.flagListingVisibility,
		Usage: "Determines the visibility of the mount in the UI-specific listing" +
			"endpoint.",
	})

	f.DurationVar(&DurationVar{
		Name:       "max-lease-ttl",
		Target:     &c.flagMaxLeaseTTL,
		Default:    0,
		EnvVar:     "",
		Completion: complete.PredictAnything,
		Usage: "The maximum lease TTL for this auth method. If unspecified, this " +
			"defaults to the Vault server's globally configured maximum lease TTL, " +
			"or a previously configured value for the auth method.",
	})

	f.StringMapVar(&StringMapVar{
		Name:       "options",
		Target:     &c.flagOptions,
		Completion: complete.PredictAnything,
		Usage: "Key-value pair provided as key=value for the mount options. " +
			"This can be specified multiple times.",
	})

	f.StringVar(&StringVar{
		Name:   flagNameTokenType,
		Target: &c.flagTokenType,
		Usage:  "Sets a forced token type for the mount.",
	})

	f.IntVar(&IntVar{
		Name:    "version",
		Target:  &c.flagVersion,
		Default: 0,
		Usage:   "Select the version of the auth method to run. Not supported by all auth methods.",
	})

	return set
}

func (c *AuthTuneCommand) AutocompleteArgs() complete.Predictor {
	return c.PredictVaultAuths()
}

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

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

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

	args = f.Args()
	switch {
	case len(args) < 1:
		c.UI.Error(fmt.Sprintf("Not enough arguments (expected 1, got %d)", len(args)))
		return 1
	case len(args) > 1:
		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
	}

	if c.flagVersion > 0 {
		if c.flagOptions == nil {
			c.flagOptions = make(map[string]string)
		}
		c.flagOptions["version"] = strconv.Itoa(c.flagVersion)
	}

	mountConfigInput := api.MountConfigInput{
		DefaultLeaseTTL: ttlToAPI(c.flagDefaultLeaseTTL),
		MaxLeaseTTL:     ttlToAPI(c.flagMaxLeaseTTL),
		Options:         c.flagOptions,
	}

	// Set these values only if they are provided in the CLI
	f.Visit(func(fl *flag.Flag) {
		if fl.Name == flagNameAuditNonHMACRequestKeys {
			mountConfigInput.AuditNonHMACRequestKeys = c.flagAuditNonHMACRequestKeys
		}

		if fl.Name == flagNameAuditNonHMACResponseKeys {
			mountConfigInput.AuditNonHMACResponseKeys = c.flagAuditNonHMACResponseKeys
		}

		if fl.Name == flagNameDescription {
			mountConfigInput.Description = &c.flagDescription
		}

		if fl.Name == flagNameListingVisibility {
			mountConfigInput.ListingVisibility = c.flagListingVisibility
		}

		if fl.Name == flagNameTokenType {
			mountConfigInput.TokenType = c.flagTokenType
		}
	})

	// Append /auth (since that's where auths live) and a trailing slash to
	// indicate it's a path in output
	mountPath := ensureTrailingSlash(sanitizePath(args[0]))

	if err := client.Sys().TuneMount("/auth/"+mountPath, mountConfigInput); err != nil {
		c.UI.Error(fmt.Sprintf("Error tuning auth method %s: %s", mountPath, err))
		return 2
	}

	c.UI.Output(fmt.Sprintf("Success! Tuned the auth method at: %s", mountPath))
	return 0
}