module Stimulus::Manifest

def extract_controllers_from(directory)
  (directory.children.select { |e| e.to_s =~ /_controller(\.\w+)+$/ } +
    directory.children.select(&:directory?).collect { |d| extract_controllers_from(d) }
  ).flatten.sort
end

def generate_from(controllers_path)
  manifest = extract_controllers_from(controllers_path).collect do |controller_path|
    import_and_register_controller(controllers_path, controller_path)
  end
  manifest.uniq
end

def import_and_register_controller(controllers_path, controller_path)
  controller_path = controller_path.relative_path_from(controllers_path).to_s
  module_path = controller_path.split('.').first
  controller_class_name = module_path.underscore.camelize.gsub(/::/, "__")
  tag_name = module_path.remove(/_controller/).gsub(/_/, "-").gsub(/\//, "--")
  <<-JS
port #{controller_class_name} from "./#{module_path}"
plication.register("#{tag_name}", #{controller_class_name})
  JS
end