require "rubygems"
require "json"

class Stat
  attr_reader :times

  def initialize(times)
    @times = times
  end

  def mean
    @mean ||= times.inject(0) { |sum, t| sum + t } / size
  end

  def size
    @size ||= times.size
  end

  def sorted
    @sorted ||= times.sort
  end

  def median
    sorted[size / 2]
  end

  def max
    sorted.last
  end

  def min
    sorted.first
  end

  def stddev
    Math.sqrt(times.inject(0) { |sum, t| sum + (mean - t) ** 2 } / size)
  end

  def inspect
    {
      :call_count => size,
      :mean       => print_float(mean),
      :median     => print_float(median),
      :stddev     => print_float(stddev),
      :max        => print_float(max),
      :min        => print_float(min)
    }.inspect
  end

  def print_float(float)
    ("%.5f" % float.to_f).to_f
  end

end


firefox = JSON.parse(File.read("firefox.json"))
android = JSON.parse(File.read("android.json"))

commands = (firefox.keys + android.keys).uniq.sort

commands.each do |command|
  puts "#{command}: \n"
  if ff_times = firefox[command]
    puts "\tfirefox : #{Stat.new(ff_times).inspect}"
  else
    puts "\tfirefox : not called"
  end

  if a_times = android[command]
    puts "\tandroid : #{Stat.new(a_times).inspect}"
  else
    puts "\tandroid : not called"
  end

end