package keybase

import (
	"encoding/json"
	"os/exec"
)

// Possible MemberTypes
const (
	TEAM string = "team"
	USER string = "impteamnative"
)

// Possible TopicTypes
const (
	DEV  string = "dev"
	CHAT string = "chat"
)

// NewKeybase returns a new Keybase. Optionally, you can pass a string containing the path to the Keybase executable as the first argument.
func NewKeybase(path ...string) *Keybase {
	k := &Keybase{}
	if len(path) < 1 {
		k.Path = "keybase"
	} else {
		k.Path = path[0]
	}
	k.Version = k.version()
	k.LoggedIn = k.loggedIn()
	if k.LoggedIn {
		k.Username = k.username()
	}
	return k
}

// Exec executes the given Keybase command
func (k *Keybase) Exec(command ...string) ([]byte, error) {
	out, err := exec.Command(k.Path, command...).Output()
	if err != nil {
		return []byte{}, err
	}
	return out, nil
}

// NewChat returns a new Chat instance
func (k *Keybase) NewChat(channel Channel) Chat {
	return Chat{
		keybase: k,
		Channel: channel,
	}
}

// NewTeam returns a new Team instance
func (k *Keybase) NewTeam(name string) Team {
	return Team{
		keybase: k,
		Name:    name,
	}
}

// username returns the username of the currently logged-in Keybase user.
func (k *Keybase) username() string {
	cmdOut, err := k.Exec("status", "-j")
	if err != nil {
		return ""
	}

	var s status
	json.Unmarshal(cmdOut, &s)

	return s.Username
}

// loggedIn returns true if Keybase is currently logged in, otherwise returns false.
func (k *Keybase) loggedIn() bool {
	cmdOut, err := k.Exec("status", "-j")
	if err != nil {
		return false
	}

	var s status
	json.Unmarshal(cmdOut, &s)

	return s.LoggedIn
}

// version returns the version string of the client.
func (k *Keybase) version() string {
	cmd := exec.Command(k.Path, "version", "-S", "-f", "s")
	cmdOut, err := cmd.Output()
	if err != nil {
		return ""
	}

	return string(cmdOut)
}