public function render_admin(){
  if (!current_user_can('manage_options')) return;

  global $wpdb;

  $ti = $this->table(self::DB_INSTALLS);
  $ts = $this->table(self::DB_SUBS);
  $exists_i = (bool)$wpdb->get_var("SHOW TABLES LIKE '{$ti}'");
  $exists_s = (bool)$wpdb->get_var("SHOW TABLES LIKE '{$ts}'");
  $count_i  = $exists_i ? (int)$wpdb->get_var("SELECT COUNT(*) FROM {$ti}") : 0;
  $count_s  = $exists_s ? (int)$wpdb->get_var("SELECT COUNT(*) FROM {$ts}") : 0;
  $missing  = $exists_s ? (int)$wpdb->get_var("SELECT COUNT(*) FROM {$ts} WHERE (install_id IS NULL OR install_id=0)") : 0;

  echo '<div class="wrap"><h1>📱 Agro PWA Tracker <small style="font-weight:normal;color:#777;">v1.6.2</small></h1>';
  echo '<div class="notice '.(($exists_i&&$exists_s)?'notice-success':'notice-error').'" style="padding:8px 12px;margin:10px 0">';
  echo '<strong>Diagnostik:</strong> Installs: <code>'.$count_i.'</code> ('.($exists_i?'table OK':'table MISSING').') · Subs: <code>'.$count_s.'</code> ('.($exists_s?'table OK':'table MISSING').')';
  echo '</div>';

  // 🔔 Papar banner backfill di atas SEMUA tab
  if ($missing > 0){
    $bf_url = wp_nonce_url(admin_url('admin-post.php?action=agro_pwa_backfill_installs'), 'agro_pwa_backfill');
    echo '<div class="notice notice-warning"><p>';
    echo 'Terdapat <strong>'.$missing.'</strong> subscription tanpa <code>install_id</code>. ';
    echo '<a class="button button-primary" href="'.esc_url($bf_url).'" onclick="return confirm(\'Cipta/attach install untuk rekod ini? (selamat)\');">Backfill missing installs</a>';
    echo '</p></div>';
  }

  echo '<p><a class="button button-primary" href="'.esc_url(admin_url('admin-post.php?action=agro_pwa_export_csv')).'">Export CSV</a> ';
  echo '<a class="button" href="'.esc_url(admin_url('admin.php?page=agro-pwa-settings')).'">Settings</a></p>';

  // Cari & paginate
  $q    = isset($_GET['q']) ? sanitize_text_field($_GET['q']) : '';
  $tab  = isset($_GET['tab']) ? sanitize_text_field($_GET['tab']) : 'installs';
  $page = max(1, intval($_GET['paged'] ?? 1));
  $per  = 50;
  $off  = ($page-1)*$per;

  echo '<form method="get" style="margin:12px 0">';
  echo '<input type="hidden" name="page" value="agro-pwa-users">';
  echo '<input type="text" name="q" value="'.esc_attr($q).'" placeholder="Cari IP / User Agent / Token…" style="width:320px">';
  echo '<select name="tab"><option value="installs"'.selected($tab,'installs',false).'>Installs</option><option value="subs"'.selected($tab,'subs',false).'>Subscriptions</option></select> ';
  echo '<button class="button">Filter</button>';
  echo '</form>';

  $nonce = wp_create_nonce('agro_pwa_bulk_delete');

  if ($tab === 'installs'){
    $where = '1=1';
    $params = [];
    if ($q) {
      $where .= " AND (ip LIKE %s OR user_agent LIKE %s OR device_hint LIKE %s)";
      $like = '%'.$wpdb->esc_like($q).'%';
      $params = [$like,$like,$like];
    }
    $total = $exists_i ? (int)$wpdb->get_var($wpdb->prepare("SELECT COUNT(*) FROM {$ti} WHERE $where", $params)) : 0;
    $rows  = $exists_i ? $wpdb->get_results($wpdb->prepare("SELECT * FROM {$ti} WHERE $where ORDER BY install_time DESC LIMIT %d OFFSET %d", $per, $off)) : [];

    echo '<h2>Installs</h2>';
    echo '<form method="post" action="'.esc_url(admin_url('admin-post.php')).'" onsubmit="return confirm(\'Padam rekod terpilih?\');">';
    echo '<input type="hidden" name="action" value="agro_pwa_bulk_delete" />';
    echo '<input type="hidden" name="type" value="installs" />';
    echo '<input type="hidden" name="_wpnonce" value="'.esc_attr($nonce).'" />';
    echo '<p><button class="button button-secondary" type="submit">Delete Selected</button></p>';
    echo '<table class="widefat striped"><thead><tr>
      <th style="width:28px;"><input type="checkbox" onclick="jQuery(\'.chk-install\').prop(\'checked\', this.checked)" /></th>
      <th>ID</th><th>WP User</th><th>Device</th><th>Display Mode</th><th>User Agent</th><th>Installed</th><th>Last Seen</th><th>IP</th>
    </tr></thead><tbody>';
    if ($rows){
      foreach($rows as $r){
        printf('<tr>
          <td><input type="checkbox" class="chk-install" name="ids[]" value="%d" /></td>
          <td>%d</td><td>%s</td><td>%s</td><td>%s</td>
          <td style="max-width:420px;word-break:break-all">%s</td>
          <td>%s</td><td>%s</td><td>%s</td>
        </tr>',
          $r->id,
          $r->id,
          $r->wp_user_id ?: '-',
          esc_html($r->device_hint ?: '-'),
          esc_html($r->display_mode ?: '-'),
          esc_html($r->user_agent ?: ''),
          esc_html($r->install_time),
          esc_html($r->last_seen ?: ''),
          esc_html($r->ip ?: '-')
        );
      }
    } else {
      echo '<tr><td colspan="9"><em>No records</em></td></tr>';
    }
    echo '</tbody></table>';
    echo '<p><button class="button button-secondary" type="submit">Delete Selected</button></p>';
    echo '</form>';

    $pages = max(1, ceil($total/$per));
    if ($pages>1){
      echo '<p>';
      for ($i=1;$i<=$pages;$i++){
        $url = add_query_arg(['page'=>'agro-pwa-users','tab'=>'installs','q'=>$q,'paged'=>$i], admin_url('admin.php'));
        echo ($i==$page) ? "<span style='margin-right:6px'><strong>$i</strong></span>" : "<a style='margin-right:6px' href='".esc_url($url)."'>$i</a>";
      }
      echo '</p>';
    }

  } else {
    $where = '1=1';
    $params = [];
    if ($q) {
      $where .= " AND (ip LIKE %s OR endpoint LIKE %s OR fcm_token LIKE %s)";
      $like = '%'.$wpdb->esc_like($q).'%';
      $params = [$like,$like,$like];
    }
    $total = $exists_s ? (int)$wpdb->get_var($wpdb->prepare("SELECT COUNT(*) FROM {$ts} WHERE $where", $params)) : 0;
    $rows  = $exists_s ? $wpdb->get_results($wpdb->prepare("SELECT * FROM {$ts} WHERE $where ORDER BY created_at DESC LIMIT %d OFFSET %d", $per, $off)) : [];

    echo '<h2>Push Subscriptions</h2>';
    echo '<form method="post" action="'.esc_url(admin_url('admin-post.php')).'" onsubmit="return confirm(\'Padam rekod terpilih?\');">';
    echo '<input type="hidden" name="action" value="agro_pwa_bulk_delete" />';
    echo '<input type="hidden" name="type" value="subs" />';
    echo '<input type="hidden" name="_wpnonce" value="'.esc_attr($nonce).'" />';
    echo '<p><button class="button button-secondary" type="submit">Delete Selected</button></p>';
    echo '<table class="widefat striped"><thead><tr>
      <th style="width:28px;"><input type="checkbox" onclick="jQuery(\'.chk-sub\').prop(\'checked\', this.checked)" /></th>
      <th>ID</th><th>Install ID</th><th>WP User</th><th>Revoked</th>
      <th>Endpoint</th><th>FCM Token</th>
      <th>Receipts</th><th>Last Received</th>
      <th>Created</th><th>Last Active</th><th>IP</th>
      <th>Action</th>
    </tr></thead><tbody>';
    if ($rows){
      foreach($rows as $s){
        $tokDisp = $s->fcm_token ? esc_html(substr($s->fcm_token,0,48)).'…' : '-';
        printf('<tr>
          <td><input type="checkbox" class="chk-sub" name="ids[]" value="%d" /></td>
          <td>%d</td><td>%s</td><td>%s</td><td>%s</td>
          <td style="max-width:240px;word-break:break-all">%s</td>
          <td style="max-width:360px;word-break:break-all"><code>%s</code></td>
          <td>%d</td><td>%s</td>
          <td>%s</td><td>%s</td><td>%s</td>
          <td>%s</td>
        </tr>',
          $s->id,
          $s->id,
          $s->install_id ?: '-',
          $s->wp_user_id ?: '-',
          $s->revoked ? 'Yes' : 'No',
          esc_html($s->endpoint ?: ''),
          $tokDisp,
          intval($s->receipt_count ?? 0),
          esc_html($s->last_received ?? ''),
          esc_html($s->created_at),
          esc_html($s->last_active ?? ''),
          esc_html($s->ip ?: '-'),
          $s->fcm_token ? '<button type="button" class="button send-pwa-test" data-token="'.esc_attr($s->fcm_token).'">Send Test</button>' : '-'
        );
      }
    } else {
      echo '<tr><td colspan="13"><em>No records</em></td></tr>';
    }
    echo '</tbody></table>';
    echo '<p><button class="button button-secondary" type="submit">Delete Selected</button></p>';
    echo '</form>';

    $pages = max(1, ceil($total/$per));
    if ($pages>1){
      echo '<p>';
      for ($i=1;$i<=$pages;$i++){
        $url = add_query_arg(['page'=>'agro-pwa-users','tab'=>'subs','q'=>$q,'paged'=>$i], admin_url('admin.php'));
        echo ($i==$page) ? "<span style='margin-right:6px'><strong>$i</strong></span>" : "<a style='margin-right:6px' href='".esc_url($url)."'>$i</a>";
      }
      echo '</p>';
    }

    $rest_push = esc_url(rest_url(self::NS.'/pwa/push-test'));
    echo "<script>
    (function(){
      var btns = document.querySelectorAll('.send-pwa-test');
      for (var i=0;i<btns.length;i++){
        (function(btn){
          btn.addEventListener('click', function(){
            var token = btn.getAttribute('data-token');
            if (!token) return;
            btn.disabled = true; var old=btn.textContent; btn.textContent='Sending…';
            fetch('{$rest_push}', {
              method:'POST',
              headers:{'Content-Type':'application/json'},
              body:JSON.stringify({
                fcmToken: token,
                title: 'Ujian Agro PWA',
                body: 'Notifikasi percubaan dari Admin.',
                link: '".esc_url(home_url('/'))."'
              })
            }).then(function(r){return r.json();})
              .then(function(d){
                alert('HTTP '+(d.code||'')+': '+(d.body && d.body.name ? 'OK' : (d.body && d.body.error ? d.body.error : 'Sila semak konfigurasi FCM / service account')));
              }).catch(function(e){ alert('Error: '+e); })
              .finally(function(){ btn.disabled=false; btn.textContent=old; });
          });
        })(btns[i]);
      }
    })();
    </script>";
  }

  echo '</div>';
}
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