discourse/app/services/username_changer.rb

# frozen_string_literal: true

class UsernameChanger
  def initialize(user, new_username, actor = nil)
    @user = user
    @old_username = user.username
    @new_username = new_username
    @actor = actor
  end

  def self.change(user, new_username, actor = nil)
    self.new(user, new_username, actor).change
  end

  def self.override(user, new_username)
    if user.username_equals_to?(new_username)
      # override anyway since case could've been changed:
      UsernameChanger.change(user, new_username, user)
      true
    elsif user.username != UserNameSuggester.fix_username(new_username)
      suggested_username = UserNameSuggester.suggest(new_username, current_username: user.username)
      UsernameChanger.change(user, suggested_username, user)
      true
    else
      false
    end
  end

  def change(asynchronous: true, run_update_job: true)
    return false if @user.username == @new_username

    @user.username = @new_username

    if @user.save
      if @actor && @old_username != @new_username
        StaffActionLogger.new(@actor).log_username_change(@user, @old_username, @new_username)
      end

      if run_update_job
        UsernameChanger.update_username(
          user_id: @user.id,
          old_username: @old_username,
          new_username: @new_username,
          avatar_template: @user.avatar_template_url,
          asynchronous: asynchronous,
        )
      end
      return true
    end

    false
  end

  def self.update_username(
    user_id:,
    old_username:,
    new_username:,
    avatar_template:,
    asynchronous: true
  )
    args = {
      user_id: user_id,
      old_username: old_username,
      new_username: new_username,
      avatar_template: avatar_template,
    }

    if asynchronous
      Jobs.enqueue(:update_username, args)
    else
      Jobs::UpdateUsername.new.execute(args)
    end
  end
end