module Sprockets::Rails::LegacyAssetUrlHelper

def asset_path(source, options = {})
  source = source.to_s
  return "" unless source.present?
  return source if source =~ URI_REGEXP
  tail, source = source[/([\?#].+)$/], source.sub(/([\?#].+)$/, '')
  if extname = compute_asset_extname(source, options)
    source = "#{source}#{extname}"
  end
  if source[0] != ?/
    source = compute_asset_path(source, options)
  end
  relative_url_root = (defined?(config.relative_url_root) && config.relative_url_root) ||
    (respond_to?(:request) && request.try(:script_name))
  if relative_url_root
    source = "#{relative_url_root}#{source}" unless source.starts_with?("#{relative_url_root}/")
  end
  if host = compute_asset_host(source, options)
    source = "#{host}#{source}"
  end
  "#{source}#{tail}"
end

def audio_path(source, options = {})
  path_to_asset(source, {:type => :audio}.merge(options))
end

def compute_asset_extname(source, options = {})
  return if options[:extname] == false
  extname = options[:extname] || ASSET_EXTENSIONS[options[:type]]
  extname if extname && File.extname(source) != extname
end

def compute_asset_host(source = "", options = {})
  request = self.request if respond_to?(:request)
  if defined? config
    host = config.asset_host
  elsif defined? ActionController::Base.asset_host
    host = ActionController::Base.asset_host
  end
  host ||= request.base_url if request && options[:protocol] == :request
  return unless host
  if host.respond_to?(:call)
    arity = host.respond_to?(:arity) ? host.arity : host.method(:call).arity
    args = [source]
    args << request if request && (arity > 1 || arity < 0)
    host = host.call(*args)
  elsif host =~ /%d/
    host = host % (Zlib.crc32(source) % 4)
  end
  if host =~ URI_REGEXP
    host
  else
    protocol = options[:protocol] || (request ? :request : :relative)
    case protocol
    when :relative
      "//#{host}"
    when :request
      "#{request.protocol}#{host}"
    else
      "#{protocol}://#{host}"
    end
  end
end

def compute_asset_path(source, options = {})
  dir = ASSET_PUBLIC_DIRECTORIES[options[:type]] || ""
  File.join(dir, source)
end

def font_path(source, options = {})
  path_to_asset(source, {:type => :font}.merge(options))
end

def image_path(source, options = {})
  path_to_asset(source, {:type => :image}.merge(options))
end

def javascript_path(source, options = {})
  path_to_asset(source, {:type => :javascript}.merge(options))
end

def stylesheet_path(source, options = {})
  path_to_asset(source, {:type => :stylesheet}.merge(options))
end

def video_path(source, options = {})
  path_to_asset(source, {:type => :video}.merge(options))
end