<?php
if (PHP_SAPI !== 'cli')
{
  http_response_code(404);
  exit;
}

$piwigo_root = realpath(dirname(__DIR__, 3));
if ($piwigo_root === false)
{
  fwrite(STDERR, "Piwigo-Root wurde nicht gefunden.\n");
  exit(1);
}
define('PHPWG_ROOT_PATH', rtrim($piwigo_root, DIRECTORY_SEPARATOR).DIRECTORY_SEPARATOR);

$_SERVER['REMOTE_ADDR'] = '127.0.0.1';
$_SERVER['SERVER_ADDR'] = '127.0.0.1';
$_SERVER['SERVER_NAME'] = 'localhost';
$_SERVER['HTTP_HOST'] = 'localhost';
$_SERVER['SERVER_PORT'] = '80';
$_SERVER['REQUEST_METHOD'] = 'GET';
$_SERVER['REQUEST_URI'] = '/';
$_SERVER['SCRIPT_NAME'] = '/plugins/bratonien_tools/runtime/webdav-warmup-dispatch.php';
$_SERVER['PHP_SELF'] = $_SERVER['SCRIPT_NAME'];
$_SERVER['QUERY_STRING'] = '';
$_SERVER['HTTP_USER_AGENT'] = 'Bratonien-WebDAV-Worker-Dispatcher/0.9.7.1.23';
$_SERVER['HTTPS'] = 'off';

require_once(PHPWG_ROOT_PATH.'include/common.inc.php');
if (!defined('BRATONIEN_TOOLS_PATH'))
{
  fwrite(STDERR, "Bratonien Tools ist nicht aktiv.\n");
  exit(1);
}
require_once(BRATONIEN_TOOLS_PATH.'include/nc_connector.inc.php');
require_once(BRATONIEN_TOOLS_PATH.'include/webdav_warmup_settings.inc.php');

function bratonien_tools_webdav_dispatch_existing_status($connection_id)
{
  if (!function_exists('bratonien_tools_webdav_warmup_status_file_for_connection')) return null;
  $file = bratonien_tools_webdav_warmup_status_file_for_connection($connection_id);
  if (!is_file($file) || !is_readable($file)) return null;
  $raw = @file_get_contents($file);
  $data = $raw !== false ? json_decode($raw, true) : null;
  return is_array($data) ? $data : null;
}

function bratonien_tools_webdav_dispatch_failure_lines(array $output)
{
  $failures = array();
  foreach ($output as $line)
  {
    $line = trim((string)$line);
    if ($line === '') continue;
    if (
      strpos($line, 'download_failed') !== false
      || strpos($line, ' ok=0 ') !== false
      || strpos($line, '[BRAT-WORKER] fatal ') !== false
      || stripos($line, 'RESTORE FEHLGESCHLAGEN') !== false
    )
    {
      $failures[] = $line;
      if (count($failures) >= 8) break;
    }
  }
  return $failures;
}

$mode = 'periodic';
$wait = false;
$connection_filter = 0;
foreach ($argv as $arg)
{
  if (preg_match('/^--mode=(sync|periodic|manual|rebuild)$/', $arg, $m)) $mode = $m[1];
  elseif (preg_match('/^--connection-id=(\d+)$/', $arg, $m)) $connection_filter = (int)$m[1];
  elseif ($arg === '--wait') $wait = true;
}

$settings = bratonien_tools_get_webdav_warmup_settings();
if (!in_array($mode, array('manual','rebuild'), true) && empty($settings['enabled']))
{
  fwrite(STDOUT, "WebDAV-Worker ist deaktiviert.\n");
  exit(0);
}
if (!function_exists('exec'))
{
  fwrite(STDERR, "PHP exec() ist deaktiviert; Worker kann nicht gestartet werden.\n");
  exit(1);
}

$worker = realpath(BRATONIEN_TOOLS_PATH.'runtime/lib/webdav-cache-warmup.php');
$priority_waiter = realpath(BRATONIEN_TOOLS_PATH.'runtime/lib/run-webdav-priority-wait.sh');
if (!$worker || !is_file($worker))
{
  fwrite(STDERR, "WebDAV-Worker wurde nicht gefunden.\n");
  exit(1);
}
if (!$priority_waiter || !is_file($priority_waiter))
{
  fwrite(STDERR, "WebDAV-Prioritäts-Warter wurde nicht gefunden.\n");
  exit(1);
}

$log = PHPWG_ROOT_PATH.PWG_LOCAL_DIR.'bratonien-webdav-warmup.log';
$result = 0;
$started = 0;
$matched = 0;

$run_inline = $wait || in_array($mode, array('manual','rebuild'), true);

foreach (bratonien_tools_nc_connector_connections() as $connection)
{
  if (empty($connection['enabled']) || !bratonien_tools_nc_connector_is_webdav($connection)) continue;
  $connection_id = (int)$connection['id'];
  if ($connection_id < 1) continue;
  if ($connection_filter > 0 && $connection_id !== $connection_filter) continue;
  $matched++;

  $config = isset($connection['config']) && is_array($connection['config']) ? $connection['config'] : array();
  $state_dir = rtrim((string)($config['state_dir'] ?? ''), '/');
  if ($state_dir === '')
  {
    fwrite(STDERR, "Worker für Verbindung #{$connection_id} übersprungen: Connector-State-Verzeichnis fehlt.\n");
    $result = 1;
    continue;
  }

  if ($mode === 'sync')
  {
    if (!is_dir($state_dir) && !@mkdir($state_dir, 0750, true) && !is_dir($state_dir))
    {
      fwrite(STDERR, "Worker-Priorität für Verbindung #{$connection_id} konnte nicht signalisiert werden: State-Verzeichnis fehlt.\n");
      $result = 1;
      continue;
    }
    $priority_file = $state_dir.'/webdav-cache-warmup-priority-sync';
    $priority_payload = json_encode(array(
      'connection_id'=>$connection_id,
      'requested_at'=>time(),
      'reason'=>'connector-sync-complete',
    ), JSON_UNESCAPED_SLASHES);
    if (!is_string($priority_payload) || @file_put_contents($priority_file, $priority_payload."\n", LOCK_EX) === false)
    {
      fwrite(STDERR, "Worker-Priorität für Verbindung #{$connection_id} konnte nicht geschrieben werden.\n");
      $result = 1;
      continue;
    }
    @chmod($priority_file, 0664);
  }

  $worker_command = escapeshellarg(PHP_BINARY).' '.escapeshellarg($worker)
    .' --connection-id='.$connection_id
    .' --mode='.escapeshellarg($mode);
  $base = $mode === 'sync'
    ? escapeshellarg('/bin/bash').' '.escapeshellarg($priority_waiter).' '.escapeshellarg($state_dir).' '.$worker_command
    : $worker_command;

  if ($run_inline)
  {
    $output = array();
    $exit = 1;
    @exec($base.' 2>&1', $output, $exit);
    foreach ($output as $line)
    {
      fwrite(STDOUT, $line."\n");
      @file_put_contents($log, $line."\n", FILE_APPEND | LOCK_EX);
    }
    if ($exit !== 0)
    {
      $result = $exit;
      if (function_exists('bratonien_tools_webdav_warmup_write_status'))
      {
        $existing = bratonien_tools_webdav_dispatch_existing_status($connection_id);
        $failures = bratonien_tools_webdav_dispatch_failure_lines($output);
        $terminal = is_array($existing) && in_array((string)($existing['state'] ?? ''), array('error','fatal','preempted'), true);

        if ($terminal)
        {
          $message = trim((string)($existing['message'] ?? 'WebDAV-Worker wurde mit Fehlern beendet.'));
          if ($failures)
          {
            $message .= ' Fehlerbeispiele: '.implode(' | ', $failures);
          }
          $extra = $existing;
          unset($extra['state'], $extra['message'], $extra['connection_id'], $extra['updated_at']);
          $extra['worker_exit_code'] = (int)$exit;
          $extra['dispatcher_preserved_worker_status'] = true;
          if ($failures) $extra['failure_examples'] = $failures;
          bratonien_tools_webdav_warmup_write_status(
            $connection_id,
            (string)$existing['state'],
            $message,
            $extra
          );
        }
        else
        {
          $detail = $failures
            ? implode(' | ', $failures)
            : ($output ? implode(' ', array_slice($output, -8)) : 'keine Worker-Ausgabe');
          bratonien_tools_webdav_warmup_write_status(
            $connection_id,
            'error',
            'WebDAV-Worker Exit '.(int)$exit.'. Ursache: '.$detail,
            array('mode'=>$mode, 'worker_exit_code'=>(int)$exit, 'failure_examples'=>$failures)
          );
        }
      }
    }
    else
    {
      $started++;
    }
  }
  else
  {
    $command = 'nohup '.$base.' >> '.escapeshellarg($log).' 2>&1 < /dev/null & echo $!';
    $output = array();
    $exit = 1;
    @exec($command, $output, $exit);
    $pid = isset($output[0]) ? (int)$output[0] : 0;
    if ($exit !== 0 || $pid <= 0)
    {
      fwrite(STDERR, "Worker für Verbindung #{$connection_id} konnte nicht gestartet werden.\n");
      $result = 1;
      continue;
    }
    $started++;
    fwrite(STDOUT, "WebDAV-Worker {$mode} für Verbindung #{$connection_id} gestartet (PID {$pid}).\n");
  }
}

if ($connection_filter > 0 && $matched === 0)
{
  fwrite(STDERR, "WebDAV-Verbindung #{$connection_filter} wurde nicht als aktive Connector-Verbindung gefunden.\n");
  exit(1);
}
if (!$run_inline) fwrite(STDOUT, "Gestartete WebDAV-Worker: {$started}.\n");
exit($result);