package terminal

import (
	"fmt"
	"os"

	"golang.org/x/term"
)

// Is this a valid interactive terminal?
func check() {
	if !term.IsTerminal(int(os.Stdin.Fd())) {
		panic("An interactive terminal is required to use a text editor!")
	}
}

// Put the terminal in raw mode
func RawOn() *term.State {
	check()

	oldState, err := term.MakeRaw(int(os.Stdin.Fd()))
	if err != nil {
		panic(err)
	}

	return oldState
}

// Restore the terminal to canonical mode
func RawOff(oldState *term.State) {
	err := term.Restore(int(os.Stdin.Fd()), oldState)
	if err != nil {
		panic(err)
	}
}

// Print a formatted string to stdout, with CRLF line endings for proper terminal formatting
func OutLn(format string, a ...interface{}) {
	formatted := fmt.Sprintf(format, a...)

	fmt.Printf("%s\r\n", formatted)
}