paulfioravanti / resume

    class DependencyManager

      extend Forwardable

      # Initialises a new instance of a Dependency Manager.

      #

      # @param dependencies [Hash]

      #   A hash containing the gem and font dependencies for resume generation.

      # @return [DependencyManager]

      #   The dependency manager object.

      def initialize(dependencies)

        @gem_installer = GemInstaller.new(dependencies[:gems])

        @font_downloader = FontDownloader.new(dependencies[:fonts])

      end

      def_delegators :@gem_installer,

                     :gems,

                     :audit_gem_dependencies,

                     :output_gem_dependencies,

                     :gems_successfully_installed?

      def_delegators :@font_downloader,

                     :fonts,

                     :audit_font_dependencies,

                     :output_font_dependencies,

                     :fonts_successfully_downloaded?

      # Determines whether gem or font dependencies are required to

      # generate resume.

      #

      # @return [true] if installation of dependencies required.

      # @return [false] if installation of dependencies not required.

      def installation_required?

        audit_gem_dependencies

        audit_font_dependencies

        dependencies_present?

      end

      # Asks the user generating the resume for permission to install

      # the required dependencies.

      #

      # @return [nil]

      def request_dependency_installation

        Output.warning(:i_need_the_following_to_generate_a_pdf)

        output_gem_dependencies

        output_font_dependencies

        Output.question(:may_i_please_install_them)

      end

      # Attempts to install the dependencies needed to

      # generate the resume.

      #

      # @raise [DependencyInstallationError]

      #   if any dependencies are unable to be installed.

      # @return [nil]

      #   if all dependencies are able to be installed.

      def install

        # rubocop:disable Style/GuardClause

        # NOTE: I think a non-guard clause reads better here

        if gems_successfully_installed? && fonts_successfully_downloaded?

          Output.success(:dependencies_successfully_installed)

        else

          raise DependencyInstallationError

        end

        # rubocop:enable Style/GuardClause

      end

      private

      def dependencies_present?

        gems.any? || fonts.any?

      end

    end