# encoding: UTF-8

module Central
  module Devtools
    module Flay
      # Measure flay mass relative to size of duplicated sexps
      class Scale
        include Adamantium
        include Anima.new(:minimum_mass, :files)
        include Procto.call(:measure)

        # Measure duplication mass
        #
        # @return [Array<Rational>]
        # @api private
        def measure
          flay.masses.map do |hash, mass|
            Rational(mass, flay.hashes.fetch(hash).size)
          end
        end

        # Report flay output
        #
        # @return [undefined]
        # @api private
        def flay_report
          flay.report
        end

        private

        # Memoized flay instance
        #
        # @return [Flay]
        # @api private
        def flay
          ::Flay.new(mass: minimum_mass).tap do |flay|
            flay.process(*files)
            flay.analyze
          end
        end
        memoize :flay, freezer: :noop
      end

      # Expand include and exclude file settings for flay
      class FileList
        include Procto.call, Concord.new(:includes, :excludes)

        # Expand includes and filter by excludes
        #
        # @return [Set<Pathname>]
        # @api private
        def call
          include_set - exclude_set
        end

        private

        # Set of excluded files
        #
        # @return [Set<Pathname>]
        # @api private
        def exclude_set
          excludes.flat_map(&Pathname.method(:glob))
        end

        # Set of included files
        #
        # Expanded using flay's file expander which takes into
        # account flay's plugin support
        #
        # @return [Set<Pathname>]
        # @api private
        def include_set
          Set.new(flay_includes.map(&method(:Pathname)))
        end

        # Expand includes using flay
        #
        # Expanded using flay's file expander which takes into
        # account flay's plugin support
        #
        # @return [Array<String>]
        # @api private
        def flay_includes
          ::Flay.expand_dirs_to_files(includes)
        end
      end
    end
  end
end