<?php
/**
 * Universal Form Handler for WebWizard exported sites.
 * Handles both SMTP mailing and local file storage.
 */

header('Content-Type: application/json; charset=utf-8');

$config = [];
if (file_exists('config.php')) {
	$config = include 'config.php';
}

function sendResponse(bool $success, string $message) {
	echo json_encode(['success' => $success, 'message' => $message]);
	exit;
}

if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
	sendResponse(false, 'Method not allowed.');
}

// Honeypot spam protection
if (!empty($_POST['website'])) {
	sendResponse(true, 'Spam detected.'); // Fake success for bots
}

$name = trim($_POST['name'] ?? '');
$email = trim($_POST['email'] ?? '');
$message = trim($_POST['message'] ?? '');

if (!$name || !$email || !$message) {
	sendResponse(false, 'Prosím vyplňte všetky povinné polia.');
}

if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
	sendResponse(false, 'Neplatná emailová adresa.');
}

$mode = $config['form_mode'] ?? 'local';

if ($mode === 'local') {
	// Save to messages directory
	$msgDir = 'messages';
	if (!is_dir($msgDir)) {
		mkdir($msgDir, 0777, true);
	}

	$msgId = date('Ymd-His') . '-' . bin2hex(random_bytes(4));
	$msgData = [
		'id' => $msgId,
		'timestamp' => date('c'),
		'sender_name' => $name,
		'sender_email' => $email,
		'message' => $message
	];

	if (file_put_contents($msgDir . '/' . $msgId . '.json', json_encode($msgData, JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE))) {
		sendResponse(true, 'Vaša správa bola úspešne uložená.');
	} else {
		sendResponse(false, 'Nepodarilo sa uložiť správu.');
	}
} else {
	// SMTP / Mail mode
	$to = $config['smtp']['recipient'] ?? '';
	if (!$to) {
		sendResponse(false, 'Cieľový email nie je nakonfigurovaný.');
	}

	$subject = "Nová správa z webu: " . ($config['site_name'] ?? 'WebWizard');
	$body = "Meno: $name\nEmail: $email\n\nSpráva:\n$message";
	$headers = "From: webwizard@{$_SERVER['HTTP_HOST']}\r\n" .
			   "Reply-To: $email\r\n" .
			   "X-Mailer: PHP/" . phpversion();

	// Using standard mail() as fallback for MVP if no complex SMTP is provided
	if (mail($to, $subject, $body, $headers)) {
		sendResponse(true, 'Vaša správa bola úspešne odoslaná.');
	} else {
		sendResponse(false, 'Nepodarilo sa odoslať email.');
	}
}