class RuboCop::Formatter::OffenseCountFormatter

def file_finished(_file, offenses)
  offenses.each { |o| @offense_counts[o.cop_name] += 1 }
  @progressbar.increment if instance_variable_defined?(:@progressbar)
end

def finished(_inspected_files)
  report_summary(@offense_counts)
end

def ordered_offense_counts(offense_counts)
  Hash[offense_counts.sort_by { |k, v| [-v, k] }]
end

def report_summary(offense_counts)
  per_cop_counts = ordered_offense_counts(offense_counts)
  total_count = total_offense_count(offense_counts)
  output.puts
  per_cop_counts.each do |cop_name, count|
    output.puts "#{count.to_s.ljust(total_count.to_s.length + 2)}" \
                "#{cop_name}\n"
  end
  output.puts '--'
  output.puts "#{total_count}  Total"
  output.puts
end

def started(target_files)
  super
  @offense_counts = Hash.new(0)
  return unless output.tty?
  file_phrase = target_files.count == 1 ? 'file' : 'files'
  # 185/407 files |====== 45 ======>                    |  ETA: 00:00:04
  # %c / %C       |       %w       >         %i         |       %e
  bar_format = " %c/%C #{file_phrase} |%w>%i| %e "
  @progressbar = ProgressBar.create(
    output: output,
    total: target_files.count,
    format: bar_format,
    autostart: false
  )
  @progressbar.start
end

def total_offense_count(offense_counts)
  offense_counts.values.inject(0, :+)
end