class Licensee::LicenseRules

def flatten
  members.map { |m| public_send(m) }.flatten
end

def from_hash(hash)
  ordered_array = hash.values_at(*members.map(&:to_s))
  new(*ordered_array)
end

def from_license(license)
  from_meta(license.meta)
end

def from_meta(meta)
  rules = {}
  Rule.groups.each do |group|
    rules[group] = (meta[group] || []).map do |tag|
      Rule.find_by_tag_and_group(tag, group)
    end
  end
  from_hash(rules)
end

def key?(key)
  members.include?(key.to_sym)
end