<?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) {
      $git_available =
        preg_match(
          "/ 200 OK$/",
          get_headers("https://git.archlinux32.org/archlinux32/packages")[0]
        );
      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) {
    if (isset($line))
      $line = "#L" . $line;
    else
      $line = "";
    if ($commit_is_hash)
      $commit = "commit/" . $commit;
    else
      $commit = "branch/" . $commit;
    switch ($type) {
      case "tree":
        return
          "https://git.archlinux32.org/archlinux32/" .
          $repository .
          "/src/" .
          $commit .
          "/" .
          $path .
          $line;
      case "log":
        return
          "https://git.archlinux32.org/archlinux32/" .
          $repository .
          "/commits/" .
          $commit .
          "/" .
          $path .
          $line;
    }

  } else {
    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://git2.archlinux32.org/Archlinux32/" .
          $repository .
          "/tree/" .
          $path .
          $commit .
          $line;
      case "log":
        return
          "https://git2.archlinux32.org/Archlinux32/" .
          $repository .
          "/log/" .
          $path .
          $commit .
          $line;
    }
  };
};

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

function site_is_reachable($url) {
  $stream_context = stream_context_create(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 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);
}

function parse_package_filename($filename, $repo = NULL) {
  if (! preg_match(
      '/^(\S+)-(([^-:]+):)?([^-:]+)-([^-]+)-([^-]+)\.pkg\.tar\.xz$/',
      $filename,
      $matches
    ))
    return;
  $result = array(
    'pkgname' => $matches[1],
    'pkgver'  => $matches[4],
    'pkgrel'  => $matches[5],
    'arch'    => $matches[6]
  );
  if (!empty($repo))
    $result['repo'] = $repo;
  if (empty($matches[3]))
    $result['epoch'] = '0';
  else
    $result['epoch'] = $matches[3];

  return $result;
}

function find_upstream_packages_in($repo) {
  $parse_package_filename_in_repo = function($filename) use ($repo) {
    return parse_package_filename($filename, $repo);
  };
  return
    array_map(
      $parse_package_filename_in_repo,
      explode(
        "\n",
        shell_exec(
          "tar -Oxzf /var/lib/pacman/sync/" . $repo . ".db" .
          " | grep -xFA1 '%FILENAME%'" .
          " | grep -vxF '%FILENAME%\n--'"
        )
      )
    );
}

function available_upstream_packages($columns = NULL) {
  $available_upstream_packages = apcu_fetch('available_upstream_packages', $apcu_success);
  if ($apcu_success == false) {
    $available_upstream_packages_repowise = array_map(
      'find_upstream_packages_in',
      array(
        'core', 'extra', 'community'
      )
    );
    $available_upstream_packages = array();
    foreach ($available_upstream_packages_repowise as $sub_array)
      $available_upstream_packages =
        array_merge(
          $available_upstream_packages,
          $sub_array
        );
    apcu_store('available_upstream_packages', $available_upstream_packages, 1800);
  }

  if (!isset($columns))
    return $available_upstream_packages;
  if (!is_array($columns))
    return array_column($available_upstream_packages, $columns);
  $select_columns_of_interest = function($row) use ($columns) {
    $select = function($column) use ($row) {
      return $row[$column];
    };
    return
      array_combine(
        $columns,
        array_map(
          $select,
          $columns
        )
      );
  };
  return
    array_map(
      $select_columns_of_interest,
      $available_upstream_packages
    );
}