package term

import (
	"os"
	"strings"

	"github.com/mattn/go-isatty"
)

// Terminal offers utilities to interact with the terminal.
type Terminal struct {
	NoInput bool
}

func New() *Terminal {
	return &Terminal{}
}

// IsInteractive returns whether the app is attached to an interactive terminal
// and can prompt the user.
func (t *Terminal) IsInteractive() bool {
	return !t.NoInput && t.IsTTY()
}

// IsTTY returns whether the app is attached to an interactive terminal.
func (t *Terminal) IsTTY() bool {
	return isatty.IsTerminal(os.Stdin.Fd())
}

// SupportsUTF8 returns whether the computer is configured to support UTF-8.
func (t *Terminal) SupportsUTF8() bool {
	lang := strings.ToUpper(os.Getenv("LANG"))
	lc := strings.ToUpper(os.Getenv("LC_ALL"))
	return strings.Contains(lang, "UTF") || strings.Contains(lc, "UTF")
}