package keybase

import (
	"fmt"
	"os/exec"
)

// Options holds... run... options...
type Options struct {
	// Optional, but required if keybase is not in your path
	KeybaseLocation string

	// Only use this if you know what you're doing
	HomeDir string

	// Show others a typing notification while the bot is working on a command
	EnableTyping bool

	// Turn off Keybase's 'bot lite' mode. Only disable if you need to.
	DisableLiteMode bool

	// The size of the channel buffers, may vary on rate of message ingestion
	ChannelBufferSize int
}

// locateKeybase attempts to find the location of the keybase binary using the system PATH
func locateKeybase() (string, error) {
	path, err := exec.LookPath("keybase")
	if err != nil {
		return "", fmt.Errorf("could not determine path for keybase binary: %v", err)
	}
	return path, nil
}

// buildArgs adds the homedirectory before the args, when required
func buildArgs(opts Options, args ...string) ([]string, error) {
	if len(args) == 0 {
		return nil, fmt.Errorf("no arguments")
	}

	// initialize slice so we never return a nil object
	cmd := make([]string, 0)
	if opts.HomeDir != "" {
		cmd = append(cmd, "--home", opts.HomeDir)
	}
	if !opts.DisableLiteMode {
		cmd = append(cmd, "--enable-bot-lite-mode")
	}
	cmd = append(cmd, args...)

	return cmd, nil
}