<?php

namespace Civi;

class Version {

  /**
   * Get the CiviCRM version
   */
  public static function findVersion() {
    $verFile = implode(DIRECTORY_SEPARATOR, [dirname(__FILE__), 'xml', 'version.xml']);
    if (file_exists($verFile)) {
      $str = file_get_contents($verFile);
      $xmlObj = simplexml_load_string($str);
      return (string) $xmlObj->version_no;
    }

    trigger_error("Unknown version", E_USER_ERROR);
    exit();
  }

  /**
   * Get the CMS name
   */
  public static function findCMS() {
    if (defined('CIVICRM_UF')) {
      return CIVICRM_UF;
    }
    elseif (function_exists('drupal_bootstrap') && version_compare(VERSION, '6.0', '>=') && version_compare(VERSION, '7.0', '<')) {
      return 'Drupal6';
    }
    elseif (function_exists('drupal_bootstrap') && version_compare(VERSION, '7.0', '>=') && version_compare(VERSION, '8.0', '<')) {
      return 'Drupal';
    }
    else {
      // guess CMS name from the current path
      list($cmsType,) = self::findCMSRootPath();

      if (!empty($cmsType)) {
        return $cmsType;
      }
    }
  }

  /**
   * Get the CMS root path and CMS name
   */
  public static function findCMSRootPath() {
    $cmsPatterns = array(
      'Wordpress' => array(
        'wp-includes/version.php',
        // Future? 'vendor/civicrm/wordpress/civicrm.php' => 'wp',
      ),
      'Joomla' => array(
        'administrator/components/com_civicrm/civicrm/civicrm-version.php',
      ),
      'Drupal' => array(
        'modules/system/system.module', // D7
      ),
      'Drupal8' => array(
        'core/core.services.yml', // D8
      ),
      'Backdrop' => array(
        'core/modules/layout/layout.module',
      ),
    );

    $parts = explode('/', str_replace('\\', '/', self::getSearchDir()));
    while (!empty($parts)) {
      $basePath = implode('/', $parts);

      foreach ($cmsPatterns as $cmsType => $relPaths) {
        foreach ($relPaths as $relPath) {
          $matches = glob("$basePath/$relPath");
          if (!empty($matches)) {
            return [$cmsType, $basePath];
          }
        }
      }

      array_pop($parts);
    }
  }

  /**
   * Get the current path
   */
  public static function getSearchDir() {
    // getenv('PWD') works better with symlinked source trees, but it's
    // not portable to Windows.
    if (strtoupper(substr(PHP_OS, 0, 3)) === 'WIN') {
      return getcwd();
    }
    else {
      return getenv('PWD');
    }
  }

}

/**
 * Get the CiviCRM version.
 * TODO : For now this function is not included in \Civi\Version class so not to break any code
 *   which directly call civicrmVersion(). So those call need to replaced with \Civi\Version::civicrmVersion()
 *   when included in the class
 */
function civicrmVersion() {
  return [
    'version' => \Civi\Version::findVersion(),
    'cms' => \Civi\Version::findCMS(),
  ];
}