require "rack/mime" unless defined?(::Rack::Mime)
require "multi_mime/adapter"
require "multi_mime/null_type"

module MultiMime
  module Adapters

    # Use the Rack::Mime library
    class RackMime < Adapter

      #
      def type_for(mime_type, opts={})
        type = ::Rack::Mime::MIME_TYPES.key(mime_type) # Rack::Mime actually doesnt allow you to simply verify that a mime type exists
        type ? mime_type : MultiMime::NullType.new
      end

      #
      def type_for_extension(extension, opts={})
        extension.insert(0, ".") unless extension[0] == "." # requires the extension with a dot
        ::Rack::Mime.mime_type(extension, MultiMime::NullType.new) # set the fallback to nil
      end

      #
      def type_for_path(path, opts={})
        type_for_extension(File.extname(path))
      end

      #
      def type_for_file(file, opts={})
        type_for_extension(File.extname(file))
      end

    end

  end
end