class UserSession

class UserSession implements AccountInterface {
    
    /**
     * User ID.
     *
     * @var int
     */
    protected $uid = 0;
    
    /**
     * List of the roles this user has.
     *
     * Defaults to the anonymous role.
     *
     * @var array
     */
    protected $roles = [
        AccountInterface::ANONYMOUS_ROLE,
    ];
    
    /**
     * The Unix timestamp when the user last accessed the site.
     *
     * @var string
     */
    protected $access;
    
    /**
     * The name of this account.
     *
     * @var string
     */
    public $name = '';
    
    /**
     * The preferred language code of the account.
     *
     * @var string
     */
    protected $preferred_langcode;
    
    /**
     * The preferred administrative language code of the account.
     *
     * @var string
     */
    protected $preferred_admin_langcode;
    
    /**
     * The email address of this account.
     *
     * @var string
     */
    protected $mail;
    
    /**
     * The timezone of this account.
     *
     * @var string
     */
    protected $timezone;
    
    /**
     * Constructs a new user session.
     *
     * @param array $values
     *   Array of initial values for the user session.
     */
    public function __construct(array $values = []) {
        foreach ($values as $key => $value) {
            $this->{$key} = $value;
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function id() {
        return $this->uid;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getRoles($exclude_locked_roles = FALSE) {
        $roles = $this->roles;
        if ($exclude_locked_roles) {
            $roles = array_values(array_diff($roles, [
                AccountInterface::ANONYMOUS_ROLE,
                AccountInterface::AUTHENTICATED_ROLE,
            ]));
        }
        return $roles;
    }
    
    /**
     * {@inheritdoc}
     */
    public function hasPermission($permission) {
        // User #1 has all privileges.
        if ((int) $this->id() === 1) {
            return TRUE;
        }
        return $this->getRoleStorage()
            ->isPermissionInRoles($permission, $this->getRoles());
    }
    
    /**
     * {@inheritdoc}
     */
    public function isAuthenticated() {
        return $this->uid > 0;
    }
    
    /**
     * {@inheritdoc}
     */
    public function isAnonymous() {
        return $this->uid == 0;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getPreferredLangcode($fallback_to_default = TRUE) {
        $language_list = \Drupal::languageManager()->getLanguages();
        if (!empty($this->preferred_langcode) && isset($language_list[$this->preferred_langcode])) {
            return $language_list[$this->preferred_langcode]
                ->getId();
        }
        else {
            return $fallback_to_default ? \Drupal::languageManager()->getDefaultLanguage()
                ->getId() : '';
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function getPreferredAdminLangcode($fallback_to_default = TRUE) {
        $language_list = \Drupal::languageManager()->getLanguages();
        if (!empty($this->preferred_admin_langcode) && isset($language_list[$this->preferred_admin_langcode])) {
            return $language_list[$this->preferred_admin_langcode]
                ->getId();
        }
        else {
            return $fallback_to_default ? \Drupal::languageManager()->getDefaultLanguage()
                ->getId() : '';
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function getUsername() {
        @trigger_error('\\Drupal\\Core\\Session\\AccountInterface::getUsername() is deprecated in Drupal 8.0.0, will be removed before Drupal 9.0.0. Use \\Drupal\\Core\\Session\\AccountInterface::getAccountName() or \\Drupal\\user\\UserInterface::getDisplayName() instead. See https://www.drupal.org/node/2572493', E_USER_DEPRECATED);
        return $this->getAccountName();
    }
    
    /**
     * {@inheritdoc}
     */
    public function getAccountName() {
        return $this->name;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getDisplayName() {
        $name = $this->name ?: \Drupal::config('user.settings')->get('anonymous');
        \Drupal::moduleHandler()->alter('user_format_name', $name, $this);
        return $name;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getEmail() {
        return $this->mail;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getTimeZone() {
        return $this->timezone;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getLastAccessedTime() {
        return $this->access;
    }
    
    /**
     * Returns the role storage object.
     *
     * @return \Drupal\user\RoleStorageInterface
     *   The role storage object.
     */
    protected function getRoleStorage() {
        return \Drupal::entityTypeManager()->getStorage('user_role');
    }

}