class Middleman::Extensions::AssetHash

def after_configuration
  # Allow specifying regexes to ignore, plus always ignore apple touch icons
  @ignore = Array(options.ignore) + [/^apple-touch-icon/]
  app.use ::Middleman::Middleware::InlineURLRewriter,
          id: :asset_hash,
          url_extensions: options.exts.sort.reverse,
          source_extensions: %w(.htm .html .php .css .js),
          ignore: @ignore,
          middleman_app: app,
          proc: method(:rewrite_url)
end

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 'digest/sha1'
  require 'rack/mock'
  require 'middleman-core/middleware/inline_url_rewriter'
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 options.exts.include?(resource.ext)
  return if ignored_resource?(resource)
  return if resource.ignored?
  # Render through the Rack interface so middleware and mounted apps get a shot
  response = @rack_client.get(
    URI.escape(resource.destination_path),
    'bypass_inline_url_rewriter_asset_hash' => 'true'
  )
  raise "#{resource.path} should be in the sitemap!" unless response.status == 200
  digest = Digest::SHA1.hexdigest(response.body)[0..7]
  resource.destination_path = resource.destination_path.sub(/\.(\w+)$/) { |ext| "-#{digest}#{ext}" }
  resource
end

def rewrite_url(asset_path, dirpath, _request_path)
  uri = ::Addressable::URI.parse(asset_path)
  relative_path = uri.path[0..0] != '/'
  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