module Lookbook::ClassNamesHelper

def build_tag_values(*args)
  tag_values = []
  args.each do |tag_value|
    case tag_value
    when Hash
      tag_value.each do |key, val|
        tag_values << key.to_s if val && key.present?
      end
    when Array
      tag_values.concat build_tag_values(*tag_value)
    else
      tag_values << tag_value.to_s if tag_value.present?
    end
  end
  tag_values
end

def class_names(*args)
  tokens = build_tag_values(*args).flat_map { |value| value.to_s.split(/\s+/) }.uniq
  safe_join(tokens, " ")
end