package command

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

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

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

type SecretsTuneCommand struct {
	*BaseCommand

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

func (c *SecretsTuneCommand) Synopsis() string {
	return "Tune a secrets engine configuration"
}

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

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

  Tune the default lease for the PKI secrets engine:

      $ vault secrets tune -default-lease-ttl=72h pki/

` + c.Flags().Help()

	return strings.TrimSpace(helpText)
}

func (c *SecretsTuneCommand) 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 secrets engine. If unspecified, " +
			"this defaults to the Vault server's globally configured default lease " +
			"TTL, or a previously configured value for the secrets engine.",
	})

	f.StringVar(&StringVar{
		Name:   flagNameDescription,
		Target: &c.flagDescription,
		Usage: "Human-friendly description of this secret engine. 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 secrets engine. If unspecified, " +
			"this defaults to the Vault server's globally configured maximum lease " +
			"TTL, or a previously configured value for the secrets engine.",
	})

	f.StringSliceVar(&StringSliceVar{
		Name:   flagNamePassthroughRequestHeaders,
		Target: &c.flagPassthroughRequestHeaders,
		Usage: "Comma-separated string or list of request header values that " +
			"will be sent to the plugin",
	})

	f.StringSliceVar(&StringSliceVar{
		Name:   flagNameAllowedResponseHeaders,
		Target: &c.flagAllowedResponseHeaders,
		Usage: "Comma-separated string or list of response header values that " +
			"plugins will be allowed to set",
	})

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

	return set
}

func (c *SecretsTuneCommand) AutocompleteArgs() complete.Predictor {
	return c.PredictVaultMounts()
}

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

func (c *SecretsTuneCommand) 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)
	}

	// Append a trailing slash to indicate it's a path in output
	mountPath := ensureTrailingSlash(sanitizePath(args[0]))

	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 == flagNamePassthroughRequestHeaders {
			mountConfigInput.PassthroughRequestHeaders = c.flagPassthroughRequestHeaders
		}

		if fl.Name == flagNameAllowedResponseHeaders {
			mountConfigInput.AllowedResponseHeaders = c.flagAllowedResponseHeaders
		}
	})

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

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