<?php

if ($_ENV['PANTHEON_ENVIRONMENT'] != 'live') {
  die();
}

$config['email'] = '[EMAIL]';
$config['sitemap'] = 'https://www.mydomain.com/post-sitemap.xml';

check_sitemap_urls($config['sitemap'], $config['email'], 30);


/**
 * Everything below this line is repeated across all scripts in this directory because files in private directory cannot be included/required
 * Check the urls from provided sitemap and send resuls by email(email currently disabled)
 */

function check_sitemap_urls($sitemap_url, $email, $limit = -1, $offset = 0) {

  $time_start = microtime(true);

  $check_urls = get_url_list($sitemap_url);


  if (!isset($check_urls) || empty($check_urls)) {
    die('Must define urls to check.');
  }

  $failed = 0;
  $results = array();

  // if a limit is set make sure we get the latest entries to the limit
  if($limit !== -1 && is_int($limit) && $limit > 0 && is_int($offset)) {
    $check_urls = array_slice(array_reverse($check_urls), $offset, $limit);
  }

  foreach ( $check_urls as $url ) {
    $status = url_checker_test_url($url);
    $results[] = array(
      'url' => $url,
      'status' => $status
    );
    if ($status != 200) {
      $failed++;
    }
  }

  $tested = sizeof($results);

  $output = url_checker_build_output($results, $failed);
  $time_end = microtime(true);

  print $output;
  print 'Tested: ' . $tested . "\n";
  print 'Time: ' . ($time_end - $time_start) . " seconds\n\n";


  if (isset($config['email'])) {
    $subject = 'Cache warm report: www.asapp.com';

    $message = '';
    $message .= 'Failed: ' . $failed . "\n";
    $message .= 'Tested: ' . $tested . "\n";
    $message .= 'Time: ' . ($time_end - $time_start) . " seconds\n\n";
    $message .= "Below is a list of each tested url and its status:\n\n";
    $message .= $output;

    $acceptedForDelivery = mail($config['email'], $subject, $message);

    if ($acceptedForDelivery) {
      print "Sent email to {$config['email']}.\n";
    }
    else {
      print "Notification email to {$config['email']} could not be queued for delivery.\n";
    }
  }
}

/**
 * Gets a list of urls from a provided sitemap address
 */
function get_url_list($sitemap_url) {
  $check_urls = array();
  $xml = simplexml_load_file($sitemap_url);
  foreach ($xml->url as $entry) {
    $check_urls[] = $entry->loc;
  }
  return $check_urls;
}

/**
 * Constructs workflow output
 */
function url_checker_build_output($results, $failed) {
  $output = "\nURL Checks\n--------\n";
  foreach ($results as $item) {
    $output .= '  ' . $item['status'] . ' - ' . $item['url'] . "\n";
  }
  $output .= "--------\n" . $failed . " failed\n\n";
  return $output;
}

/**
 * Try to access the specified URL, and return the http status code.
 */
function url_checker_test_url($url) {
  $ch = curl_init($url);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
  curl_exec($ch);
  $info = curl_getinfo($ch);
  curl_close($ch);
  return $info['http_code'];
}
?>