package command

import (
	"fmt"
	"strings"

	"github.com/hashicorp/vault/api"
	"github.com/hashicorp/vault/helper/pgpkeys"
	"github.com/hashicorp/vault/meta"
)

// InitCommand is a Command that initializes a new Vault server.
type InitCommand struct {
	meta.Meta
}

func (c *InitCommand) Run(args []string) int {
	var threshold, shares, storedShares, recoveryThreshold, recoveryShares int
	var pgpKeys, recoveryPgpKeys pgpkeys.PubKeyFilesFlag
	var check bool
	flags := c.Meta.FlagSet("init", meta.FlagSetDefault)
	flags.Usage = func() { c.Ui.Error(c.Help()) }
	flags.IntVar(&shares, "key-shares", 5, "")
	flags.IntVar(&threshold, "key-threshold", 3, "")
	flags.IntVar(&storedShares, "stored-shares", 0, "")
	flags.Var(&pgpKeys, "pgp-keys", "")
	flags.IntVar(&recoveryShares, "recovery-key-shares", 0, "")
	flags.IntVar(&recoveryThreshold, "recovery-key-threshold", 0, "")
	flags.Var(&recoveryPgpKeys, "recovery-key-pgp-keys", "")
	flags.BoolVar(&check, "check", false, "")
	if err := flags.Parse(args); err != nil {
		return 1
	}

	client, err := c.Client()
	if err != nil {
		c.Ui.Error(fmt.Sprintf(
			"Error initializing client: %s", err))
		return 1
	}

	if check {
		return c.checkStatus(client)
	}

	resp, err := client.Sys().Init(&api.InitRequest{
		SecretShares:      shares,
		SecretThreshold:   threshold,
		StoredShares:      storedShares,
		PGPKeys:           pgpKeys,
		RecoveryShares:    recoveryShares,
		RecoveryThreshold: recoveryThreshold,
		RecoveryPGPKeys:   recoveryPgpKeys,
	})
	if err != nil {
		c.Ui.Error(fmt.Sprintf(
			"Error initializing Vault: %s", err))
		return 1
	}

	for i, key := range resp.Keys {
		c.Ui.Output(fmt.Sprintf("Unseal Key %d: %s", i+1, key))
	}
	for i, key := range resp.RecoveryKeys {
		c.Ui.Output(fmt.Sprintf("Recovery Key %d: %s", i+1, key))
	}

	c.Ui.Output(fmt.Sprintf("Initial Root Token: %s", resp.RootToken))

	if storedShares < 1 {
		c.Ui.Output(fmt.Sprintf(
			"\n"+
				"Vault initialized with %d keys and a key threshold of %d. Please\n"+
				"securely distribute the above keys. When the Vault is re-sealed,\n"+
				"restarted, or stopped, you must provide at least %d of these keys\n"+
				"to unseal it again.\n\n"+
				"Vault does not store the master key. Without at least %d keys,\n"+
				"your Vault will remain permanently sealed.",
			shares,
			threshold,
			threshold,
			threshold,
		))
	} else {
		c.Ui.Output(
			"\n" +
				"Vault initialized successfully.",
		)
	}
	if len(resp.RecoveryKeys) > 0 {
		c.Ui.Output(fmt.Sprintf(
			"\n"+
				"Recovery key initialized with %d keys and a key threshold of %d. Please\n"+
				"securely distribute the above keys.",
			shares,
			threshold,
		))
	}

	return 0
}

func (c *InitCommand) checkStatus(client *api.Client) int {
	inited, err := client.Sys().InitStatus()
	switch {
	case err != nil:
		c.Ui.Error(fmt.Sprintf(
			"Error checking initialization status: %s", err))
		return 1
	case inited:
		c.Ui.Output("Vault has been initialized")
		return 0
	default:
		c.Ui.Output("Vault is not initialized")
		return 2
	}
}

func (c *InitCommand) Synopsis() string {
	return "Initialize a new Vault server"
}

func (c *InitCommand) Help() string {
	helpText := `
Usage: vault init [options]

  Initialize a new Vault server.

  This command connects to a Vault server and initializes it for the
  first time. This sets up the initial set of master keys and sets up the
  backend data store structure.

  This command can't be called on an already-initialized Vault.

General Options:
` + meta.GeneralOptionsUsage() + `
Init Options:

  -check                    Don't actually initialize, just check if Vault is
                            already initialized. A return code of 0 means Vault
                            is initialized; a return code of 2 means Vault is not
                            initialized; a return code of 1 means an error was
                            encountered.

  -key-shares=5             The number of key shares to split the master key
                            into.

  -key-threshold=3          The number of key shares required to reconstruct
                            the master key.

  -stored-shares=0          The number of unseal keys to store. This is not
                            normally available.

  -pgp-keys                 If provided, must be a comma-separated list of
                            files on disk containing binary- or base64-format
                            public PGP keys, or Keybase usernames specified as
                            "keybase:<username>". The number of given entries
                            must match 'key-shares'. The output unseal keys will
                            be encrypted and hex-encoded, in order, with the
                            given public keys.  If you want to use them with the
                            'vault unseal' command, you will need to hex decode
                            and decrypt; this will be the plaintext unseal key.

  -recovery-key-shares=0    The number of key shares to split the recovery key
                            into. This is not normally available.

  -recovery-key-threshold=0 The number of key shares required to reconstruct
                            the recovery key. This is not normally available.

  -recovery-key-pgp-keys    If provided, behaves like "pgp-keys" but for the
                            recovery key shares. This is not normally available.
`
	return strings.TrimSpace(helpText)
}