<?php

/**
 * @file
 * The Hacked! module, shows which project have been changed since download.
 *
 * We download the original project file, and hash all the files contained
 * within, then we hash our local copies and compare.
 * This module should never be used on a production server.
 */

define('HACKED_CACHE_TABLE', 'hacked');

define('HACKED_STATUS_UNCHECKED', 1);
define('HACKED_STATUS_PERMISSION_DENIED', 2);
define('HACKED_STATUS_HACKED', 3);
define('HACKED_STATUS_DELETED', 4);
define('HACKED_STATUS_UNHACKED', 5);

define('HACKED_DEFAULT_FILE_HASHER', 'hacked_ignore_line_endings');

/**
 * Implementation of the hook_theme() registry.
 */
function hacked_theme() {
  return [
    'hacked_report'          => [
      'variables' => ['data' => NULL],
      'file'      => 'hacked.report.inc',
    ],
    'hacked_project_summary' => [
      'variables' => ['project' => NULL],
      'file'      => 'hacked.report.inc',
    ],
    'hacked_detailed_report' => [
      'variables' => ['project' => NULL],
      'file'      => 'hacked.details.inc',
    ],
    'hacked_file_status'     => [
      'variables' => ['file' => NULL],
      'file'      => 'hacked.details.inc',
    ],
  ];
}

/**
 * Sort callback for sorting the projects in the report.
 */
function _hacked_project_report_sort_by_status($a, $b) {
  if ($a['status'] == $b['status']) {
    return strcmp($a['name'], $b['name']);
  }
  else {
    return $a['status'] - $b['status'];
  }
}

/**
 * Determine if a file is a binary file.
 *
 * Taken from: http://www.ultrashock.com/forums/server-side/checking-if-a-file-is-binary-98391.html
 * and then tweaked in: http://drupal.org/node/760362.
 */
function hacked_file_is_binary($file) {
  if (file_exists($file)) {
    if (!is_file($file)) {
      return 0;
    }
    if (!is_readable($file)) {
      return 1;
    }

    $fh = fopen($file, "r");
    $blk = fread($fh, 512);
    fclose($fh);
    clearstatcache();

    return (
      0 or substr_count($blk, "^\r\n") / 512 > 0.3
      or substr_count($blk, "^ -~") / 512 > 0.3
      or substr_count($blk, "\x00") > 0
    );
  }
  return 0;
}

/**
 * Hacked! version of the core function, can return hidden files too.
 *
 * @param           $dir
 * @param           $mask
 * @param array     $nomask
 * @param int       $callback
 * @param bool|TRUE $recurse
 * @param string    $key
 * @param int       $min_depth
 * @param int       $depth
 * @return array
 *
 * @see file_scan_directory().
 */
function hacked_file_scan_directory($dir, $mask, $nomask = ['.', '..', 'CVS'], $callback = 0, $recurse = TRUE, $key = 'filename', $min_depth = 0, $depth = 0) {
  $key = (in_array($key, ['filename', 'basename', 'name']) ? $key : 'filename');
  $files = [];

  if (is_dir($dir) && $handle = opendir($dir)) {
    while (FALSE !== ($file = readdir($handle))) {
      if (!in_array($file, $nomask)) {
        if (is_dir("$dir/$file") && $recurse) {
          // Give priority to files in this folder by merging them in after any subdirectory files.
          $files = array_merge(hacked_file_scan_directory("$dir/$file", $mask, $nomask, $callback, $recurse, $key, $min_depth, $depth + 1), $files);
        }
        elseif ($depth >= $min_depth && preg_match($mask, $file)) {
          // Always use this match over anything already set in $files with the same $$key.
          $filename = "$dir/$file";
          $basename = basename($file);
          $name = substr($basename, 0, strrpos($basename, '.'));
          $files[$$key] = new stdClass();
          $files[$$key]->filename = $filename;
          $files[$$key]->basename = $basename;
          $files[$$key]->name = $name;
          if (is_callable($callback)) {
            $callback($filename);
          }
        }
      }
    }

    closedir($handle);
  }

  return $files;
}

/**
 * Return the file hasher that is currently selected by the user.
 */
function hacked_get_file_hasher($name = NULL) {
  if (is_null($name)) {
    $name = \Drupal::config('hacked.settings')->get('selected_file_hasher');
  }
  $hashers = hacked_get_file_hashers();
  $class_name = $hashers[$name]['class'];
  return new $class_name;
}

/**
 * Gets all the file hashers defined.
 */
function hacked_get_file_hashers() {
  $hashers = &drupal_static(__FUNCTION__);
  if (is_null($hashers)) {
    $hashers = \Drupal::moduleHandler()->invokeAll('hacked_file_hashers_info');
    \Drupal::moduleHandler()->alter('hacked_file_hashers_info', $hashers);
  }
  return $hashers;
}

/**
 * Implements hook_hacked_file_hashers_info().
 */
function hacked_hacked_file_hashers_info() {
  $hashers = [];

  $hashers['hacked_ignore_line_endings'] = [
    'class'       => '\Drupal\hacked\hackedFileIgnoreEndingsHasher',
    'name'        => t('Ignore line endings'),
    'description' => t('When hashing files differences in line endings will be ignored. This might be useful if projects have been edited on a different platform than of the original author\'s. E.g. if a file has been opened and saved on Windows.'),
  ];

  $hashers['hacked_include_line_endings'] = [
    'class'       => '\Drupal\hacked\hackedFileIncludeEndingsHasher',
    'name'        => t('Include line endings'),
    'description' => t('When hashing files differences in line endings will be included.'),
  ];

  return $hashers;
}