<?php declare(strict_types=1);

namespace Kilo;

use FFI;

$ffi = FFI::load(__DIR__ . '/ffi.h');
$original_termios = $ffi->new('struct termios');

function enableRawMode(): void
{
	global $ffi;
	global $original_termios;

	register_shutdown_function('Kilo\\disableRawMode');

	// Populate the original terminal settings
	$ffi->tcgetattr(STDIN_FILENO, FFI::addr($original_termios));

	$termios = $ffi->new('struct termios');
	$termios->c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
	$termios->c_oflag &= ~(OPOST);
	$termios->c_cflag |= (CS8);
	$termios->c_lflag &= ~(_ECHO | ICANON | IEXTEN | ISIG);
	$termios->c_cc[VMIN] = 0;
	$termios->c_cc[VTIME] = 1;

	// Turn on raw mode
	$ffi->tcsetattr(STDIN_FILENO, TCSAFLUSH, FFI::addr($termios));
}

function disableRawMode(): void
{
	global $ffi;
	global $original_termios;

	$ffi->tcsetattr(STDIN_FILENO, TCSAFLUSH, FFI::addr($original_termios));
}

function read_stdin(int $len = 128): string
{
	$handle = fopen('php://stdin', 'rb');
	$input = fread($handle, $len);

	$input = rtrim($input);
	fclose($handle);

	return $input;
}

function ctrl_key(string $char): int
{
	return ord($char) & 0x1f;
}