<?php
if (!defined('PHPWG_ROOT_PATH'))
{
  die('Hacking attempt!');
}

function bratonien_tools_nc_connector_webdav_site_id(array $connection)
{
  $config = isset($connection['config']) && is_array($connection['config']) ? $connection['config'] : array();
  if ((string)($connection['adapter'] ?? '') !== 'remote') return 0;
  if ((string)($config['source_mode'] ?? '') !== 'webdav-placeholder') return 0;

  $gallery_root = rtrim((string)($config['parallel_gallery_root'] ?? ''), '/');
  $piwigo_root = rtrim(PHPWG_ROOT_PATH, '/');
  if ($gallery_root === '' || strpos($gallery_root, $piwigo_root.'/') !== 0) return 0;

  $relative = ltrim(substr($gallery_root, strlen($piwigo_root)), '/');
  if ($relative === '') return 0;
  $site_url = './'.rtrim($relative, '/').'/';

  $result = pwg_query(
    "SELECT id FROM ".SITES_TABLE.
    " WHERE galleries_url='".pwg_db_real_escape_string($site_url)."' LIMIT 1"
  );
  if (!pwg_db_num_rows($result)) return 0;

  $row = pwg_db_fetch_assoc($result);
  return (int)$row['id'];
}

function bratonien_tools_nc_connector_remove_webdav_piwigo_content(array $connection)
{
  $site_id = bratonien_tools_nc_connector_webdav_site_id($connection);
  if ($site_id < 1) return array('site_id'=>0, 'images'=>0);

  include_once(PHPWG_ROOT_PATH.'admin/include/functions.php');

  $image_rows = array();
  $query = '
SELECT DISTINCT i.id, i.path, i.representative_ext
  FROM '.IMAGES_TABLE.' AS i
  LEFT JOIN '.CATEGORIES_TABLE.' AS sc ON sc.id = i.storage_category_id
  LEFT JOIN '.IMAGE_CATEGORY_TABLE.' AS ic ON ic.image_id = i.id
  LEFT JOIN '.CATEGORIES_TABLE.' AS vc ON vc.id = ic.category_id
  WHERE sc.site_id = '.$site_id.' OR vc.site_id = '.$site_id.'
;';
  $result = pwg_query($query);
  while ($row = pwg_db_fetch_assoc($result))
  {
    $row['id'] = (int)$row['id'];
    $image_rows[$row['id']] = $row;
  }

  foreach ($image_rows as $row)
  {
    try
    {
      delete_element_derivatives($row);
    }
    catch (Throwable $e)
    {
      error_log('Bratonien WebDAV delete derivative cleanup #'.(int)$row['id'].': '.$e->getMessage());
    }
  }

  delete_site($site_id);

  if ($image_rows)
  {
    $ids = array_keys($image_rows);
    $remaining = query2array(
      'SELECT id FROM '.IMAGES_TABLE.' WHERE id IN ('.implode(',', array_map('intval', $ids)).')',
      null,
      'id'
    );
    if ($remaining)
    {
      delete_elements(array_map('intval', $remaining), false);
    }
  }

  invalidate_user_cache(true);
  return array('site_id'=>$site_id, 'images'=>count($image_rows));
}

function bratonien_tools_nc_connector_logical_delete_members(array $connection)
{
  $members = array((int)$connection['id'] => $connection);
  $config = isset($connection['config']) && is_array($connection['config']) ? $connection['config'] : array();
  $migration = isset($config['migration']) && is_array($config['migration']) ? $config['migration'] : array();
  $role = (string)($migration['role'] ?? '');

  if ($role === 'webdav-primary-candidate')
  {
    $legacy_id = (int)($migration['legacy_fallback_connection_id'] ?? 0);
    if ($legacy_id > 0)
    {
      $legacy = bratonien_tools_nc_connector_connection($legacy_id, false);
      if ($legacy && (string)$legacy['adapter'] === 'local') $members[$legacy_id] = $legacy;
    }
  }
  elseif ($role === 'legacy-fallback')
  {
    $remote_id = (int)($migration['webdav_successor_connection_id'] ?? 0);
    if ($remote_id > 0)
    {
      $remote = bratonien_tools_nc_connector_connection($remote_id, false);
      if ($remote && (string)$remote['adapter'] === 'remote') $members[$remote_id] = $remote;
    }
  }

  return $members;
}

/**
 * Delete one user-facing connector connection. A migration pair is one logical
 * connection for the user, so its internal WebDAV and Legacy records are
 * removed together.
 */
function bratonien_tools_nc_connector_delete_safe()
{
  $id = (int)($_POST['connection_id'] ?? 0);
  $connection = bratonien_tools_nc_connector_connection($id, false);
  if (!$connection)
  {
    throw new RuntimeException('Connector-Verbindung wurde nicht gefunden.');
  }

  $members = bratonien_tools_nc_connector_logical_delete_members($connection);
  $cleanup = array('site_id'=>0, 'images'=>0);
  foreach ($members as $member)
  {
    if (
      (string)($member['adapter'] ?? '') === 'remote'
      && (string)($member['config']['source_mode'] ?? '') === 'webdav-placeholder'
    )
    {
      $cleanup = bratonien_tools_nc_connector_remove_webdav_piwigo_content($member);
      break;
    }
  }

  $table = bratonien_tools_nc_connector_table();
  $status_dir = rtrim(PHPWG_ROOT_PATH, '/').'/_data/bratonien-tools/nc-connector-status';
  foreach ($members as $member_id=>$member)
  {
    $member_id = (int)$member_id;
    pwg_query("DELETE FROM `$table` WHERE id=".$member_id." LIMIT 1");

    $public_status = $status_dir.'/connection-'.$member_id.'.json';
    if (is_file($public_status)) @unlink($public_status);

    if (is_dir($status_dir) || @mkdir($status_dir, 0755, true))
    {
      @file_put_contents($status_dir.'/deleted-'.$member_id, date('c')."\n", LOCK_EX);
    }
  }

  if ((int)$cleanup['site_id'] > 0)
  {
    return array(
      'message'=>'Verbindung wurde gelöscht. Die zugehörigen Piwigo-Alben und '.(int)$cleanup['images'].' Bilder wurden aus Piwigo entfernt. Nextcloud-Dateien blieben unverändert.',
    );
  }

  return array(
    'message'=>'Verbindung wurde gelöscht. Verbliebene Laufzeitdaten werden automatisch bereinigt. Quelldateien blieben unverändert.',
  );
}