<?php

// Load system dependencies
require_once(__DIR__ . '/../config/app.php');
require_once(__DIR__ . '/../library/cli.php');
require_once(__DIR__ . '/../library/mysql.php');
require_once(__DIR__ . '/../library/filter.php');
require_once(__DIR__ . '/../library/ftp.php');
require_once(__DIR__ . '/../library/vendor/simple_html_dom.php');

// CLI only to prevent https server connection timeout
if (php_sapi_name() != 'cli') {

  CLI::danger(_('supported command line interface only'));
  CLI::break();
  exit;
}

// Stop CLI execution on cleaner process running
$semaphore = sem_get(crc32('crontab.cleaner'), 1);

if (false === sem_acquire($semaphore, true)) {

  CLI::danger(_('stop crontab.cleaner is running in another thread.'));
  CLI::break();
  exit;
}

// Stop CLI execution on crawler process running
$semaphore = sem_get(crc32('crontab.crawler'), 1);

if (false === sem_acquire($semaphore, true)) {

  CLI::danger(_('stop crontab.crawler is running in another thread.'));
  CLI::break();
  exit;
}

// Lock multi-thread execution
$semaphore = sem_get(crc32('cli.yggo'), 1);

if (false === sem_acquire($semaphore, true)) {

  CLI::danger(_('process locked by another thread.'));
  CLI::break();
  exit;
}

// Connect database
$db = new MySQL(DB_HOST, DB_PORT, DB_NAME, DB_USERNAME, DB_PASSWORD);

// CLI begin
if (!empty($argv[1])) {

  switch ($argv[1]) {

    case 'db':

      if (empty($argv[2])) {

        switch ($argv[2]) {

          case 'optimize':

            CLI::notice(_('optimize database tables...'));

            $db->optimize();

            CLI::success(_('tables successfully optimized!'));

          break;
        }
      }

    break;
    case 'crontab':

      if (empty($argv[2])) {

        switch ($argv[2]) {

          case 'crawl':

            CLI::notice(_('crawler queue step begin...'));

            include_once(__DIR__ . '/../crontab/crawler.php');

            CLI::notice(_('crawler queue step begin...'));
          break;

          case 'clean':

            CLI::notice(_('cleaner queue step begin...'));

            include_once(__DIR__ . '/../crontab/cleaner.php');

            CLI::notice(_('cleaner queue step completed.'));

          break;
        }
      }

    break;
    case 'hostPageSnap':

      if (empty($argv[2])) {

        switch ($argv[2]) {

          case 'repair':

            // @TODO
            CLI::danger(_('this function upgraded but not tested after snaps refactor.'));
            CLI::danger(_('make sure you have backups then remove this alert.'));
            CLI::break();
            exit;

            switch ($argv[3]) {

              case 'db':

                // Normalize & cleanup DB
                CLI::notice(_('scan database registry for missed snap files...'));

                foreach ($db->getHosts() as $host) {

                  foreach ($db->getHostPages($host->hostId) as $hostPage) {

                    foreach ($db->getHostPageSnaps($hostPage->hostPageId) as $hostPageSnap) {

                      // Prepare filenames
                      $hostPageSnapPath = 'hps/' . substr(trim(chunk_split($hostPageSnap->hostPageSnapId, 1, '/'), '/'), 0, -1);
                      $hostPageSnapFile = $hostPageSnapPath . substr($hostPageSnap->hostPageSnapId, -1) . '.zip';

                      // Define variables
                      $hostPageSnapStorageFilesExists = false;

                      // Check file exists
                      foreach (json_decode(SNAP_STORAGE) as $node => $storages) {

                        foreach ($storages as $location => $storage) {

                          // Generate storage id
                          $crc32name = crc32(sprintf('%s.%s', $node, $location));

                          switch ($node) {

                            case 'localhost':

                              // @TODO implemented, not tested
                              $hostPageSnapFile = $storage->directory . $hostPageSnapFile;

                              if (file_exists($hostPageSnapFile)) {

                                $hostPageSnapStorageFilesExists = true;

                                if (!$db->findHostPageSnapStorageByCRC32Name($hostPageSnap->hostPageSnapId, $crc32name)) {

                                  if ($db->addHostPageSnapStorage($hostPageSnap->hostPageSnapId, $crc32name, $hostPageSnap->timeAdded)) {

                                    CLI::warning(sprintf(_('add index hostPageSnapId #%s file: %s node: %s location: %s;'), $hostPageSnap->hostPageSnapId, $hostPageSnapFile, $node, $location));
                                  }

                                } else {

                                  CLI::success(sprintf(_('skip related index hostPageSnapId #%s file: %s node: %s location: %s;'), $hostPageSnap->hostPageSnapId, $hostPageSnapFile, $node, $location));
                                }
                              }

                            break;

                            case 'ftp':

                              $ftp = new Ftp();

                              if ($ftp->connect($storage->host, $storage->port, $storage->username, $storage->password, $storage->directory, $storage->timeout, $storage->passive)) {

                                if ($ftp->size($hostPageSnapFile)) {

                                  $hostPageSnapStorageFilesExists = true;

                                  if (!$db->findHostPageSnapStorageByCRC32Name($hostPageSnap->hostPageSnapId, $crc32name)) {

                                    if ($db->addHostPageSnapStorage($hostPageSnap->hostPageSnapId, $crc32name, $hostPageSnap->timeAdded)) {

                                      CLI::warning(sprintf(_('add index hostPageSnapId #%s file: %s node: %s location: %s;'), $hostPageSnap->hostPageSnapId, $hostPageSnapFile, $node, $location));
                                    }
                                  } else {

                                    CLI::success(sprintf(_('skip related index hostPageSnapId #%s file: %s node: %s location: %s;'), $hostPageSnap->hostPageSnapId, $hostPageSnapFile, $node, $location));
                                  }
                                }

                              // Prevent snap deletion from registry on FTP connection lost
                              } else {

                                CLI::danger(sprintf(_('could not connect to storage %s location %s. operation stopped to prevent the data lose.'), $hostPageSnapStorageName, $location));
                                CLI::break();
                                exit;
                              }

                              $ftp->close();

                            break;
                          }
                        }
                      }

                      // Files not exists
                      if (!$hostPageSnapStorageFilesExists) {

                        // Delete snap from registry
                        try {

                          $db->beginTransaction();

                          foreach ($db->getHostPageSnapStorages($hostPageSnap->hostPageSnapId) as $hostPageSnapStorage) {

                            $db->deleteHostPageSnapDownloads($hostPageSnapStorage->hostPageSnapStorageId);
                          }

                          $db->deleteHostPageSnapStorages($hostPageSnap->hostPageSnapId);
                          $db->deleteHostPageSnap($hostPageSnap->hostPageSnapId);

                          CLI::warning(sprintf(_('delete hostPageSnapId: #%s timeAdded: %s as not found in file storages;'), $hostPageSnap->hostPageSnapId, $hostPageSnap->timeAdded));

                          $db->commit();

                        } catch(Exception $e) {

                          $db->rollBack();

                          var_dump($e);
                        }
                      }
                    }
                  }
                }

              break;
              case 'fs':

                // Cleanup FS
                CLI::notice(_('scan storage for snap files missed in the DB...'));

                // Copy files to each storage
                foreach (json_decode(SNAP_STORAGE) as $node => $storages) {

                  foreach ($storages as $location => $storage) {

                    // Generate storage id
                    $crc32name = crc32(sprintf('%s.%s', $node, $location));

                    switch ($node) {

                      case 'localhost':

                        // @TODO

                      break;

                      case 'ftp':

                        $ftp = new Ftp();

                        if ($ftp->connect($storage->host, $storage->port, $storage->username, $storage->password, $storage->directory, $storage->timeout, $storage->passive)) {

                          foreach ($ftp->nlistr($storage->directory) as $filename) {

                            if (false !== preg_match(sprintf('!/hps/([\d]+)\.zip$!ui', $storage->directory), $filename, $matches)) {

                              if (!empty($matches[1])) { // hostPageSnapId

                                if (!$db->getHostPageSnap($matches[1])) {

                                  if ($ftp->delete($filename)) {

                                    CLI::warning(sprintf(_('delete snap file: #%s from node %s location %s not found in registry;'), $filename, $node, $location));

                                  } else {

                                    CLI::danger(sprintf(_('delete snap file: #%s from node %s location %s not found in registry;'), $filename, $node, $location));
                                  }

                                } else {

                                  CLI::success(sprintf(_('skip snap file: #%s available in node %s location %s;'), $filename, $node, $location));
                                }
                              }
                            }
                          }
                        }

                        $ftp->close();

                      break;
                    }
                  }
                }

                CLI::success(_('missed snap files successfully deleted!'));
              break;
            }
          break;
          case 'reindex':

            //@TODO

          break;
        }
      }

    break;
    case 'hostPage':

      switch ($argv[2]) {

        case 'rank':

          if (empty($argv[3])) {

            switch ($argv[3]) {

              case 'reindex':

                foreach ($db->getHosts() as $host) {

                  foreach ($db->getHostPages($host->hostId) as $hostPage) {

                    $db->updateHostPageRank($hostPage->hostPageId, $db->getTotalExternalHostPageIdSourcesByHostPageIdTarget($hostPage->hostPageId)); // @TODO add library cover
                  }
                }

                CLI::success(_('hostPage rank successfully updated'));
                exit;

              break;
              default:

              CLI::danger(_('undefined action argument'));
            }
          }

        break;
      }

    break;
    case 'hostPageDom':

      if (empty($argv[2])) {

        switch ($argv[2]) {

          case 'generate':

            $selectors = [];

            foreach ((array) explode(';', !empty($argv[3]) ? $argv[3] : (string) CRAWL_HOST_PAGE_DOM_SELECTORS) as $selector) {

              if (!empty($selector)) {

                $selectors[] = trim($selector);
              }
            }

            if ($selectors) {

              // Init variables
              $hostPagesProcessedTotal = 0;
              $hostPageDOMAddedTotal   = 0;

              // Begin selectors extraction
              foreach ($db->getHostPagesByIndexed() as $hostPage) {

                if (false !== stripos(Filter::mime($hostPage->mime), 'text/html')) {

                  if ($hostPageDescription = $db->getLastPageDescription($hostPage->hostPageId)) {

                    $hostPagesProcessedTotal++;

                    if (!empty($hostPageDescription->data)) {

                      $html = str_get_html(base64_decode($hostPageDescription->data));

                      foreach ($selectors as $selector) {

                        foreach($html->find($selector) as $element) {

                          if (!empty($element->innertext)) {

                            $hostPageDOMAddedTotal++;

                            $db->addHostPageDom($hostPage->hostPageId,
                                                time(),
                                                $selector,
                                                trim(CRAWL_HOST_PAGE_DOM_STRIP_TAGS ? strip_tags(
                                                                                      preg_replace('/[\s]+/',
                                                                                                    ' ',
                                                                                                    str_replace(['<br />', '<br/>', '<br>', '</'],
                                                                                                                [' ', ' ', ' ', ' </'],
                                                                                                                $element->innertext))) : $element->innertext));
                          }
                        }
                      }
                    }
                  }
                }
              }

              CLI::success(sprintf(_('Host pages processed: %s'), $hostPagesProcessedTotal));
              CLI::success(sprintf(_('Host page DOM elements added: %s'), $hostPageDOMAddedTotal));
              exit;
            }

            CLI::danger(_('CRAWL_HOST_PAGE_DOM_SELECTORS not provided in the configuration file'));
            exit;

          break;
          case 'truncate':

            $db->truncateHostPageDom();

            CLI::success(_('hostPageDom table successfully truncated'));
            exit;

          break;
        }
      }
    break;
  }
}

// Default message
CLI::default('__  ______________      __');
CLI::default('\ \/ / ____/ ____/___  / /');
CLI::default(' \  / / __/ / __/ __ \/ /' );
CLI::default(' / / /_/ / /_/ / /_/ /_/'  );
CLI::default('/_/\____/\____/\____(_)'   );

CLI::break();
CLI::default('available options:');
CLI::break();
CLI::default('  help                   - this message');
CLI::break();
CLI::default('  db                     ');
CLI::default('    optimize             - optimize all tables');
CLI::break();
CLI::default('  crontab                ');
CLI::default('    crawl                - execute step in crawler queue');
CLI::default('    clean                - execute step in cleaner queue');
CLI::break();
CLI::default('  hostPage               ');
CLI::default('    rank                 - generate hostPage.rank fields');
CLI::break();
CLI::default('  hostPageSnap           ');
CLI::default('    repair               ');
CLI::default('      db                 - scan database registry for new or deprecated snap files');
CLI::default('      fs                 - check all storages for snap files not registered in hostPageSnapStorage, cleanup filesystem');
CLI::default('    reindex              - search for host pages without snap records, add found pages to the crawl queue');
CLI::break();
CLI::default('  hostPageDom                      ');
CLI::default('    generate [selectors] - make hostPageDom index based on related hostPage.data field');
CLI::default('    truncate             - flush hostPageDom table');

CLI::break();

CLI::default('get support: https://github.com/YGGverse/YGGo/issues');

CLI::break();
CLI::break();