<?php

/**
 * @file
 *   Views Send cron rotuines.
 *
 * @ingroup views_send
 */

/**
 * Process the spool queue at cron run.
 */
function views_send_send_from_spool() {
  $limit = variable_get('views_send_throttle', 20);
  $ok = $fail = $check = 0;

  // Get PHP maximum execution time. 30 seconds default.
  $max_execution_time = ini_get('max_execution_time') ? ini_get('max_execution_time') : VIEWS_SEND_MAX_EXECUTION_TIME;

  // Reset a Drupal timer.
  timer_start('views_send');

  // Retrieve messages to be send.
  $query = "SELECT * FROM {views_send_spool} WHERE status = :status ORDER BY tentatives ASC, timestamp ASC";
  $result = $limit ? db_query_range($query, 0, $limit, array(':status' => 0)) : db_query($query, array(':status' => 0));
  foreach ($result as $message) {
    // Send the message.
    $status = views_send_deliver($message);

    if ($status) {
      // Update the spool status.
      db_query("UPDATE {views_send_spool} SET status = :status WHERE eid = :eid", array(':status' => 1, ':eid' => $message->eid));
      if (variable_get('views_send_debug', FALSE)) {
        watchdog('views_send', 'Message sent to %mail.', array('%mail' => $message->to_mail));
      }
      if (module_exists('rules')) {
        rules_invoke_event('views_send_email_sent', $message);
      }
      $ok++;
    }
    else {
      // Increment tentatives so that next time this message
      // will be scheduled with low priority.
      db_query("UPDATE {views_send_spool} SET tentatives = tentatives + 1 WHERE eid = :eid", array(':eid' => $message->eid));
      $fail++;
    }

    // Check the elapsed time and break if we've spent more than 80%.
    // We check every 50 messages.
    if (++$check >= 50) {
      // Reset the counter.
      $check = 0;

      // Break if exceded.
      if (timer_read('views_send') / 1000 > .8 * $max_execution_time) {
        watchdog('views_send', 'PHP maximum execution time almost exceeded. Remaining e-mail messages will be sent during the next cron run. If this warning occurs regularly you should reduce the cron throttle setting.', NULL, WATCHDOG_WARNING);
        break;
      }
    }
  }

  if ($ok + $fail > 0) {
    // Log results and exit.
    watchdog('views_send', '%ok messages sent in %sec seconds, %fail failed sending.',
      array('%ok' => $ok, '%sec' => timer_read('views_send') / 1000, '%fail' => $fail)
    );
  }
}

/**
 * Clear the expired items from spool.
 */
function views_send_clear_spool() {
  // TODO: Drupal 7: replace time() with REQUEST_TIME.
  $expiration_time = time() - variable_get('views_send_spool_expire', 0) * 86400;
  db_query("DELETE FROM {views_send_spool} WHERE status = :status AND timestamp <= :expiry", array(':status' => 1, 'expiry' => $expiration_time));
}