<?php
header('Content-Type: application/json');
header('Access-Control-Allow-Origin: https://sag24.ru');
header('Access-Control-Allow-Methods: POST');
header('Access-Control-Allow-Headers: Content-Type');

if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
    http_response_code(405);
    echo json_encode(['error' => 'Method not allowed']);
    exit;
}

// ─── Rate limiting (5 requests per minute per IP) ────────────────────────────
$ip = $_SERVER['HTTP_X_FORWARDED_FOR']
    ? explode(',', $_SERVER['HTTP_X_FORWARDED_FOR'])[0]
    : ($_SERVER['REMOTE_ADDR'] ?? 'unknown');
$ip = trim($ip);
$rate_file = sys_get_temp_dir() . '/rl_' . md5($ip) . '.json';
$now = time();
$window = 60;
$max_req = 5;
$rate_data = file_exists($rate_file) ? json_decode(file_get_contents($rate_file), true) : [];
$rate_data = array_filter($rate_data ?? [], fn($t) => $t > $now - $window);
if (count($rate_data) >= $max_req) {
    http_response_code(429);
    echo json_encode(['error' => 'Too many requests. Please try again later.']);
    exit;
}
$rate_data[] = $now;
file_put_contents($rate_file, json_encode(array_values($rate_data)));

$data = json_decode(file_get_contents('php://input'), true);
if (!$data) {
    http_response_code(400);
    echo json_encode(['error' => 'Invalid JSON']);
    exit;
}

$name    = htmlspecialchars(trim($data['name'] ?? ''), ENT_QUOTES);
$company = htmlspecialchars(trim($data['company'] ?? ''), ENT_QUOTES);
$phone   = htmlspecialchars(trim($data['phone'] ?? ''), ENT_QUOTES);
$email   = htmlspecialchars(trim($data['email'] ?? ''), ENT_QUOTES);
$message = htmlspecialchars(trim($data['message'] ?? ''), ENT_QUOTES);
$turnstileToken = trim($data['turnstileToken'] ?? '');

if (!$name || !$message) {
    http_response_code(400);
    echo json_encode(['error' => 'Missing required fields']);
    exit;
}

// ─── Validation ───────────────────────────────────────────────────────────────
if ($email && !filter_var($email, FILTER_VALIDATE_EMAIL)) {
    http_response_code(400);
    echo json_encode(['error' => 'Invalid email format']);
    exit;
}
if (mb_strlen($name) > 100) { http_response_code(400); echo json_encode(['error' => 'Name too long']); exit; }
if (mb_strlen($company) > 200) { http_response_code(400); echo json_encode(['error' => 'Company too long']); exit; }
if (mb_strlen($email) > 254) { http_response_code(400); echo json_encode(['error' => 'Email too long']); exit; }
if (mb_strlen($phone) > 30)  { http_response_code(400); echo json_encode(['error' => 'Phone too long']); exit; }
if (mb_strlen($message) > 5000) { http_response_code(400); echo json_encode(['error' => 'Message too long']); exit; }

// ─── Cloudflare Turnstile verification ───────────────────────────────────────
$TURNSTILE_SECRET = ''; // TODO: Create widget at dash.cloudflare.com → Turnstile → Add site (sag24.ru)
if ($TURNSTILE_SECRET) {
    if (!$turnstileToken) {
        http_response_code(400);
        echo json_encode(['error' => 'Bot verification required.']);
        exit;
    }
    $ch = curl_init('https://challenges.cloudflare.com/turnstile/v0/siteverify');
    curl_setopt_array($ch, [
        CURLOPT_POST           => true,
        CURLOPT_POSTFIELDS     => http_build_query(['secret' => $TURNSTILE_SECRET, 'response' => $turnstileToken, 'remoteip' => $ip]),
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_TIMEOUT        => 10,
    ]);
    $tsResult = json_decode(curl_exec($ch), true);
    curl_close($ch);
    if (($tsResult['success'] ?? false) !== true) {
        http_response_code(400);
        echo json_encode(['error' => 'Bot verification failed. Please try again.']);
        exit;
    }
}

// ─── Telegram (best-effort, not fatal) ───────────────────────────────────────
$BOT_TOKEN = '8138813013:AAElH2L5NspRLSdiFjDz6Qf32n4G24P_cj8';
$CHAT_ID   = '-5230603582';

$userAgent = $_SERVER['HTTP_USER_AGENT'] ?? 'unknown';
$referer   = $_SERVER['HTTP_REFERER'] ?? '';
$country   = $_SERVER['HTTP_CF_IPCOUNTRY'] ?? '';

$text  = "🔔 <b>Заявка с sag24.ru</b>\n\n";
$text .= "👤 <b>Имя:</b> {$name}\n";
if ($company) $text .= "🏢 <b>Компания:</b> {$company}\n";
if ($email) $text .= "📧 <b>Email:</b> {$email}\n";
if ($phone) $text .= "📱 <b>Телефон:</b> {$phone}\n";
$text .= "\n💬 <b>Сообщение:</b>\n{$message}\n";
$text .= "\n📊 <b>Метаданные:</b>\n";
$text .= "🌍 IP: {$ip}\n";
if ($country) $text .= "🌐 Страна: {$country}\n";
if ($referer) $text .= "🔗 Источник: {$referer}\n";
$text .= "⏰ " . date('d.m.Y H:i', time() + 3 * 3600) . " MSK";

$ch = curl_init("https://tg-relay.it-resheniya-2018.workers.dev/bot{$BOT_TOKEN}/sendMessage");
curl_setopt_array($ch, [
    CURLOPT_POST           => true,
    CURLOPT_POSTFIELDS     => json_encode(['chat_id' => $CHAT_ID, 'text' => $text, 'parse_mode' => 'HTML']),
    CURLOPT_HTTPHEADER     => ['Content-Type: application/json'],
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_TIMEOUT        => 10,
]);
curl_exec($ch);
curl_close($ch);

// ─── Email via SMTP (noreply@sag24.ru → info@sag24.ru) ───────────────────────
$smtp_host = 'mx.hhivp.com';
$smtp_port = 587;
$smtp_user = 'noreply@sag24.ru';
$smtp_pass = '9hsnDyBAk5&S4#lE';
$mail_to   = 'info@sag24.ru';

$subject = "=?UTF-8?B?" . base64_encode("Заявка с sag24.ru от {$name}") . "?=";
$body    = "Имя: {$name}\r\n";
if ($company) $body .= "Компания: {$company}\r\n";
if ($email)   $body .= "Email: {$email}\r\n";
if ($phone)   $body .= "Телефон: {$phone}\r\n";
$body .= "\r\nСообщение:\r\n{$message}\r\n";
$body .= "\r\nIP: {$ip}";
if ($country) $body .= " | Страна: {$country}";
$body .= "\r\n" . date('d.m.Y H:i', time() + 3 * 3600) . " MSK";

try {
    $smtp = fsockopen($smtp_host, $smtp_port, $errno, $errstr, 10);
    if ($smtp) {
        fgets($smtp, 512);
        fwrite($smtp, "EHLO sag24.ru\r\n"); $caps = '';
        while ($line = fgets($smtp, 512)) { $caps .= $line; if ($line[3] == ' ') break; }
        fwrite($smtp, "STARTTLS\r\n"); fgets($smtp, 512);
        stream_socket_enable_crypto($smtp, true, STREAM_CRYPTO_METHOD_TLS_CLIENT);
        fwrite($smtp, "EHLO sag24.ru\r\n");
        while ($line = fgets($smtp, 512)) { if ($line[3] == ' ') break; }
        fwrite($smtp, "AUTH LOGIN\r\n"); fgets($smtp, 512);
        fwrite($smtp, base64_encode($smtp_user) . "\r\n"); fgets($smtp, 512);
        fwrite($smtp, base64_encode($smtp_pass) . "\r\n"); fgets($smtp, 512);
        fwrite($smtp, "MAIL FROM:<{$smtp_user}>\r\n"); fgets($smtp, 512);
        fwrite($smtp, "RCPT TO:<{$mail_to}>\r\n");     fgets($smtp, 512);
        fwrite($smtp, "DATA\r\n"); fgets($smtp, 512);
        fwrite($smtp, "From: noreply@sag24.ru\r\nTo: {$mail_to}\r\nSubject: {$subject}\r\n");
        fwrite($smtp, "MIME-Version: 1.0\r\nContent-Type: text/plain; charset=UTF-8\r\n\r\n");
        fwrite($smtp, $body . "\r\n.\r\n"); fgets($smtp, 512);
        fwrite($smtp, "QUIT\r\n");
        fclose($smtp);
    }
} catch (Throwable $e) {
    // email failure is non-fatal
}

echo json_encode(['success' => true]);