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<?php

/**
 * Nette Forms custom control example.
 */

declare(strict_types=1);


if (@!include __DIR__ . '/../vendor/autoload.php') {
	die('Install packages using `composer install`');
}

use Nette\Forms\Form;
use Nette\Forms\Helpers;
use Nette\Utils\Html;


class DateInput extends Nette\Forms\Controls\BaseControl
{
	/** @var string */
	private $day = '';

	private $month = '';

	private $year = '';


	public function __construct($label = null)
	{
		parent::__construct($label);
		$this->addRule([self::class, 'validateDate'], 'Date is invalid.');
	}


	public function setValue($value)
	{
		if ($value === null) {
			$this->day = $this->month = $this->year = '';
		} else {
			$date = Nette\Utils\DateTime::from($value);
			$this->day = $date->format('j');
			$this->month = $date->format('n');
			$this->year = $date->format('Y');
		}
		return $this;
	}


	public function getValue(): ?DateTimeImmutable
	{
		return self::validateDate($this)
			? (new DateTimeImmutable)->setDate((int) $this->year, (int) $this->month, (int) $this->day)->setTime(0, 0)
			: null;
	}


	public function isFilled(): bool
	{
		return $this->day !== '' || $this->year !== '';
	}


	public function loadHttpData(): void
	{
		$this->day = $this->getHttpData(Form::DataLine, '[day]');
		$this->month = $this->getHttpData(Form::DataLine, '[month]');
		$this->year = $this->getHttpData(Form::DataLine, '[year]');
	}


	/**
	 * Generates control's HTML element.
	 */
	public function getControl()
	{
		$name = $this->getHtmlName();
		return Html::el('input', [
			'name' => $name . '[day]',
			'id' => $this->getHtmlId(),
			'value' => $this->day,
			'type' => 'number',
			'min' => 1,
			'max' => 31,
			'data-nette-rules' => Helpers::exportRules($this->getRules()) ?: null,
		])

			. Helpers::createSelectBox(
				[1 => 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12],
				[],
				$this->month
			)->name($name . '[month]')

			. Html::el('input', [
				'name' => $name . '[year]',
				'value' => $this->year,
				'type' => 'number',
			]);
	}


	public static function validateDate(Nette\Forms\Control $control): bool
	{
		return ctype_digit($control->day)
			&& ctype_digit($control->month)
			&& ctype_digit($control->year)
			&& checkdate((int) $control->month, (int) $control->day, (int) $control->year);
	}
}


Tracy\Debugger::enable();

$form = new Form;

$form['date'] = new DateInput('Date:');
$form['date']->setDefaultValue(new DateTime);

$form->addSubmit('submit', 'Send');


if ($form->isSuccess()) {
	echo '<h2>Form was submitted and successfully validated</h2>';
	Tracy\Dumper::dump($form->getValues());
	exit;
}


?>
<!DOCTYPE html>
<meta charset="utf-8">
<title>Nette Forms custom control example</title>
<link rel="stylesheet" media="screen" href="assets/style.css" />
<script src="https://nette.github.io/resources/js/3/netteForms.js"></script>

<h1>Nette Forms custom control example</h1>

<?php $form->render() ?>

<footer><a href="https://doc.nette.org/en/forms">see documentation</a></footer>

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