// Package options holds the flags that every command has and reads
// them back.
package options

import (
	"fmt"

	"git.eeqj.de/sneak/keyfunc/internal/mnemonic"
	"github.com/spf13/cobra"
)

// Add gives a command the flags that every command has. They are
// persistent, so every command below it has them too.
func Add(cmd *cobra.Command) {
	cmd.PersistentFlags().String(
		"mnemonic-command", "",
		"shell command whose output is the mnemonic",
	)
	cmd.PersistentFlags().Uint32P(
		"index", "n", 0,
		"which key to derive",
	)
}

// Index returns the key index the user asked for.
func Index(cmd *cobra.Command) (uint32, error) {
	index, err := cmd.Flags().GetUint32("index")
	if err != nil {
		return 0, fmt.Errorf("reading the index: %w", err)
	}

	return index, nil
}

// Mnemonic returns the mnemonic, from the first source that has one.
func Mnemonic(cmd *cobra.Command) (string, error) {
	command, err := cmd.Flags().GetString("mnemonic-command")
	if err != nil {
		return "", fmt.Errorf("reading the mnemonic command: %w", err)
	}

	return mnemonic.Read(cmd.Context(), command)
}