module ISO3166::CountryFinderMethods

def [](query)
  search(query)
end

def find_all_by(attribute, val)
  attributes, lookup_value = parse_attributes(attribute, val)
  ISO3166::Data.cache.select do |_, v|
    country = Country.new(v)
    attributes.any? do |attr|
      Array(country.send(attr)).any? do |n|
        lookup_value === cached(n) { parse_value(n) }
      end
    end
  end
end

def find_by(attribute, value, obj = nil)
  find_all_by(attribute.downcase, value).map do |country|
    obj.nil? ? country : new(country.last)
  end
end

def method_missing(method_name, *arguments)
  matches = method_name.to_s.match(FIND_BY_REGEX)
  return_all = matches[1]
  super unless matches
  countries = find_by(matches[3], arguments[0], matches[2])
  return_all ? countries : countries.last
end

def parse_attributes(attribute, val)
  raise "Invalid attribute name '#{attribute}'" unless searchable_attribute?(attribute.to_sym)
  attributes = Array(attribute.to_s)
  if attribute.to_s == 'any_name'
    attributes = %w[iso_long_name iso_short_name unofficial_names translated_names]
  end
  [attributes, parse_value(val)]
end

def parse_value(value)
  value = value.gsub(SEARCH_TERM_FILTER_REGEX, '') if value.respond_to?(:gsub)
  strip_accents(value)
end

def respond_to_missing?(method_name, include_private = false)
  matches = method_name.to_s.match(FIND_BY_REGEX)
  if matches && matches[3]
    instance_methods.include?(matches[3].to_sym)
  else
    super
  end
end

def search(query)
  country = new(query.to_s.upcase)
  country&.valid? ? country : nil
end

def searchable_attribute?(attribute)
  searchable_attributes.include?(attribute.to_sym)
end

def searchable_attributes
  # Add name and names until we complete the deprecation of the finders
  instance_methods - UNSEARCHABLE_METHODS + [:name, :names, :any_name]
end