class Middleman::Extensions::AssetHash

def ignored_resource?(resource)
  @ignore.any? do |ignore|
    Middleman::Util.path_match(ignore, resource.destination_path)
  end
end

def initialize(app, options_hash={}, &block)
  super
  require 'addressable/uri'
  require 'digest/sha1'
  require 'rack/mock'
  # Allow specifying regexes to ignore, plus always ignore apple touch icons
  @ignore = Array(options.ignore) + [/^apple-touch-icon/]
  # Exclude .ico from the default list because browsers expect it
  # to be named "favicon.ico"
  @exts = options.exts || (app.config[:asset_extensions] - %w(.ico))
  app.rewrite_inline_urls id: :asset_hash,
                          url_extensions: @exts.sort.reverse,
                          source_extensions: options.sources,
                          ignore: @ignore,
                          rewrite_ignore: options.rewrite_ignore,
                          proc: method(:rewrite_url),
                          after: :asset_host
end

def manipulate_resource_list(resources)
  @rack_client ||= begin
    rack_app = ::Middleman::Rack.new(app).to_app
    ::Rack::MockRequest.new(rack_app)
  end
  # Process resources in order: binary images and fonts, then SVG, then JS/CSS.
  # This is so by the time we get around to the text files (which may reference
  # images and fonts) the static assets' hashes are already calculated.
  resources.sort_by do |a|
    if %w(.svg .svgz).include? a.ext
      0
    elsif %w(.js .css).include? a.ext
      1
    else
      -1
    end
  end.each(&method(:manipulate_single_resource))
end

def manipulate_single_resource(resource)
  return unless @exts.include?(resource.ext)
  return if ignored_resource?(resource)
  return if resource.ignored?
  digest = if resource.binary?
    ::Digest::SHA1.file(resource.source_file).hexdigest[0..7]
  else
    # Render through the Rack interface so middleware and mounted apps get a shot
    response = @rack_client.get(
      Addressable::URI.encode(resource.destination_path),
      'bypass_inline_url_rewriter_asset_hash' => 'true'
    )
    raise "#{resource.path} should be in the sitemap!" unless response.status == 200
    ::Digest::SHA1.hexdigest(response.body)[0..7]
  end
  path, basename, extension = split_path(resource.destination_path)
  resource.destination_path = options.rename_proc.call(path, basename, digest, extension, options)
  resource
end

def rewrite_url(asset_path, dirpath, _request_path)
  uri = ::Middleman::Util.parse_uri(asset_path)
  relative_path = !uri.path.start_with?('/')
  full_asset_path = if relative_path
    dirpath.join(asset_path).to_s
  else
    asset_path
  end
  return unless asset_page = app.sitemap.find_resource_by_destination_path(full_asset_path) || app.sitemap.find_resource_by_path(full_asset_path)
  replacement_path = "/#{asset_page.destination_path}"
  replacement_path = Pathname.new(replacement_path).relative_path_from(dirpath).to_s if relative_path
  replacement_path
end

def split_path(filepath)
  basename = File.basename(filepath, extension = File.extname(filepath))
  path = filepath.chomp(basename + extension)
  [path, basename, extension]
end