class Rubycritic::RevisionComparator

def compare
  SmellsStatusSetter.new(smelly_pathnames_before, smelly_pathnames_now).smelly_pathnames
end

def initialize(paths, source_control_system)
  @paths = paths
  @source_control_system = source_control_system
end

def paths_of_tracked_files
  SourceLocator.new(["."]).paths
end

def revision_file
  @revision_file ||= File.join(SNAPSHOTS_DIR, @source_control_system.head_reference)
end

def smelly_pathnames(paths)
  smell_adapters = AnalysersRunner.new(paths).run
  SmellsAggregator.new(smell_adapters).smelly_pathnames
end

def smelly_pathnames_before
  serializer = SmellyPathnamesSerializer.new(revision_file)
  if File.file?(revision_file)
    serializer.load
  else
    smelly_pathnames = nil
    @source_control_system.travel_to_head do
      smelly_pathnames = smelly_pathnames(paths_of_tracked_files)
    end
    serializer.dump(smelly_pathnames)
    smelly_pathnames
  end
end

def smelly_pathnames_now
  smelly_pathnames(@paths)
end