<?php

# do not include twice
if (function_exists("format_time_duration"))
  return;

function format_time_duration($val) {
  $val = floor($val);
  $result = "";
  $result =
    sprintf(
      "%02d",
      $val % 60
    );
  $val = floor($val / 60);
  if ($val == 0)
    return $result;
  $result =
    sprintf(
      "%02d:%s",
      $val % 60,
      $result
    );
  $val = floor($val / 60);
  if ($val == 0)
    return $result;
  $result =
    sprintf(
      "%d:%s",
      $val % 24,
      $result
    );
  $val = floor($val / 24);
  if ($val == 0)
    return $result;
  $tmp = $val % 7;
  $printed_conjunction = true;
  if ($tmp > 1)
    $result =
      sprintf(
        "%d days and %s",
        $tmp,
        $result
      );
  elseif ($tmp == 1)
    $result =
      sprintf(
        "%d day and %s",
        $tmp,
        $result
      );
  else
    $printed_conjunction = false;
  $val = floor($val / 7);
  if ($val == 0)
    return $result;
  if ($printed_conjunction)
    $result =
      sprintf(
        ", %s",
        $result
      );
  else
    $result =
      sprintf(
        " and %s",
        $result
      );
  if ($val>1)
    $result =
      sprintf(
        "%d weeks%s",
        $val,
        $result
      );
  else
    $result =
      sprintf(
        "%d week%s",
        $val,
        $result
      );
  return $result;
};

function git_url($repository,$type,$commit,$path,$line = null,$commit_is_hash = null) {
  global $git_available;
  if (!isset($git_available)) {
    $git_available = apcu_fetch('git_available', $apcu_success);
    if ($apcu_success == false) {
      $git_available =
        site_is_reachable(
          'https://git.archlinux32.org/packages'
        );
      apcu_store('git_available', $git_available, 120);
    };
    $git_available = $git_available == 1;
  }
  if (!isset($commit_is_hash))
    $commit_is_hash = preg_match("/^[0-9a-f]{40}$/",$commit)==1;
  if ($git_available)
    $host = "git.archlinux32.org";
  else
    $host = "git2.archlinux32.org";

  if (isset($line))
    $line = "#n" . $line;
  else
    $line = "";
  if ($commit_is_hash)
    $commit = "?id=" . $commit;
  else
    $commit = "?h=" . $commit;
  switch ($type) {
    case "tree":
      return
        "https://" .
        $host .
        "/" .
        $repository .
        "/tree/" .
        $path .
        $commit .
        $line;
    case "log":
      return
        "https://" .
        $host .
        "/" .
        $repository .
        "/log/" .
        $path .
        $commit .
        $line;
  }
};

function if_unset($array, $index, $default) {
  if (array_key_exists($index, $array))
    return $array[$index];
  else
    return $default;
};

function site_is_reachable($url) {
  $stream_context = stream_context_create(array('http' => array('timeout' => 10)));
  $headers = get_headers($url, 0, $stream_context);
  if (is_array($headers))
    foreach ($headers as $header) {
      if (!(strpos($header, 'HTTP/') === 0))
        continue;
      if (explode(' ', $header)[1] == '200')
        return true;
      return false;
    }
  return false;
}

function get_news($name, $url, $ttl) {
  // clear cache if you have to push out new news fast, otherwise wait for $ttl seconds
  //apcu_clear_cache();
  
  $news = apcu_fetch($name, $apcu_success);
  if( $apcu_success == false ) {
    $news_reachable = apcu_fetch($name."_reachable", $apcu_success);
    if ($apcu_success == false) {
      if (site_is_reachable($url)) {
        $news_reachable = 'YES';
      } else {
        $news_reachable = 'NO';
      }
      apcu_store($name."_reachable", $news_reachable, $ttl);
    }
    if ($news_reachable == 'YES') {
      $ch = curl_init($url);
      if( $ch != null && $ch != false ) {
        curl_setopt($ch, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
        curl_setopt($ch, CURLOPT_VERBOSE,1);
        $news = curl_exec($ch);
        $httpcode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        curl_close($ch);
        if( $httpcode >= 200 && $httpcode < 300 ) {
          apcu_store($name,  $news, $ttl);
        } else {
          $news = false;
        }
      } else {
        $news = false;
      }
    } else {
      $news = false;
    }
  }
  if ($news != false) {
    $news = simplexml_load_string($news);
  }
  return $news;
}

function add_fancy_unit($value, $unit) {
  $suffixes = array("z", "y", "a", "f", "p", "n", "µ", "m", "", "k", "M", "G", "T", "P", "Y", "Z");
  if ($value==0)
    return $value . " " . $unit;
  $exponent = max(0,min(count($suffixes)-1,round(log(abs($value))/log(1024)-1)));
  return sprintf("%.2f %s%s", $value / pow(1024,$exponent), $suffixes[8 + $exponent], $unit);
}