class Minitest::TestProf::EventProfFormatter

def by_examples(profiler)
  result = profiler.results
  examples = result[:examples]
  return unless examples
  @results << "\nTop #{profiler.top_count} slowest tests (by #{profiler.rank_by}):\n\n"
  examples.each do |example|
    description = example[:id][:name]
    location = example[:id][:location]
    time = example[:time]
    run_time = example[:run_time]
    time_percentage = time_percentage(time, run_time)
    @results <<
      <<~GROUP
        #{description.truncate} (#{location}) – #{time.duration} (#{example[:count]}) of #{run_time.duration} (#{time_percentage}%)
      GROUP
  end
end

def by_groups(profiler)
  result = profiler.results
  groups = result[:groups]
  groups.each do |group|
    description = group[:id][:name]
    location = group[:id][:location]
    time = group[:time]
    run_time = group[:run_time]
    time_percentage = time_percentage(time, run_time)
    @results <<
      <<~GROUP
        #{description.truncate} (#{location}) – #{time.duration} (#{group[:count]} / #{group[:examples]}) of #{run_time.duration} (#{time_percentage}%)
      GROUP
  end
end

def initialize(profilers)
  @profilers = profilers
  @results = []
end

def prepare_results
  @profilers.each do |profiler|
    total_results(profiler)
    by_groups(profiler)
    by_examples(profiler)
  end
  @results.join
end

def time_percentage(time, total_time)
  (time / total_time * 100).round(2)
end

def total_results(profiler)
  time_percentage = time_percentage(profiler.total_time, profiler.absolute_run_time)
  @results <<
    <<~MSG
      EventProf results for #{profiler.event}
      Total time: #{profiler.total_time.duration} of #{profiler.absolute_run_time.duration} (#{time_percentage}%)
      Total events: #{profiler.total_count}
      Top #{profiler.top_count} slowest suites (by #{profiler.rank_by}):
    MSG
end