Test for Hoodies

# Тут находится программа, выполняющая обработку данных из файла.
# Тест показывает как программа должна работать.
# В этой программе нужно обработать файл данных data_large.txt.

# Ожидания от результата:

# Корректная обработатка файла data_large.txt;
# Проведена оптимизация кода и представлены ее результаты;
# Production-ready код;
# Применены лучшие практики;

require 'json'
require 'pry'
require 'date'
require 'minitest/autorun'
require 'benchmark'
require 'set'

def parse_session(fields)
  {
    browser: fields[3].upcase,
    time: fields[4],
    date: fields[5]
  }
end

def calculate_user_stats(user, result_user_stats)
  return if user[:name].nil?

  user_stats = {}
  user_stats[:sessionsCount] = user[:sessions].count

  session_durations = user[:sessions].map { |session| session[:time].to_i }
  user_stats[:totalTime] = "#{session_durations.sum} min."
  user_stats[:longestSession] = "#{session_durations.max} min."

  browsers = user[:sessions].map { |session| session[:browser] }.sort
  user_stats[:browsers] = browsers.join(', ')
  user_stats[:usedIE] = browsers.any? { |browser| browser.match?(/INTERNET EXPLORER/) }
  user_stats[:alwaysUsedChrome] = browsers.all? { |browser| browser.match?(/CHROME/) }

  session_dates = user[:sessions].map { |session| Date.parse(session[:date]) }
  user_stats[:dates] = session_dates.sort.reverse.map(&:iso8601)

  result_user_stats[user[:name]] = user_stats
end

def handle_file
  current_user = { name: nil, sessions: [] }
  result = {
    users_count: 0,
    sessions_count: 0,
    uniq_browsers: Set.new,
    users_stats: {}
  }

  File.open('data_large.txt').each do |line|
    fields = line.split(',')
    entry_class = fields[0]

    case entry_class
    when 'user'
      calculate_user_stats(current_user, result[:users_stats])
      result[:users_count] += 1
      current_user = { name: "#{fields[2]} #{fields[3]}", sessions: [] }
    when 'session'
      current_user[:sessions] << parse_session(fields)
      result[:sessions_count] += 1
      result[:uniq_browsers] << fields[3].upcase
    end
  end

  calculate_user_stats(current_user, result[:users_stats])

  result
end

def work
  result = handle_file

  report = {
    totalUsers: result[:users_count],
    totalSessions: result[:sessions_count],
    uniqueBrowsersCount: result[:uniq_browsers].count,
    allBrowsers: result[:uniq_browsers].to_a.sort.join(','),
    usersStats: result[:users_stats]
  }

  File.write('result.json', "#{report.to_json}\n")
end

# Benchmark.bmbm do |x|
#   x.report('work') { work }
# end

# Rehearsal ----------------------------------------
# work  49.371923   0.657388  50.029311 ( 50.304776)
# ------------------------------ total: 50.029311sec

#            user     system      total        real
# work  48.509724   0.419018  48.928742 ( 49.084887)

class TestMe < Minitest::Test
  def setup
    File.write('result.json', '')
    File.write(
      'data_large.txt',
      <<~TEXT
        user,0,Leida,Cira,0
        session,0,0,Safari 29,87,2016-10-23
        session,0,1,Firefox 12,118,2017-02-27
        session,0,2,Internet Explorer 28,31,2017-03-28
        session,0,3,Internet Explorer 28,109,2016-09-15
        session,0,4,Safari 39,104,2017-09-27
        session,0,5,Internet Explorer 35,6,2016-09-01
        user,1,Palmer,Katrina,65
        session,1,0,Safari 17,12,2016-10-21
        session,1,1,Firefox 32,3,2016-12-20
        session,1,2,Chrome 6,59,2016-11-11
        session,1,3,Internet Explorer 10,28,2017-04-29
        session,1,4,Chrome 13,116,2016-12-28
        user,2,Gregory,Santos,86
        session,2,0,Chrome 35,6,2018-09-21
        session,2,1,Safari 49,85,2017-05-22
        session,2,2,Firefox 47,17,2018-02-02
        session,2,3,Chrome 20,84,2016-11-25
      TEXT
    )
  end

  def test_result
    work
    expected_result = '{"totalUsers":3,"uniqueBrowsersCount":14,"totalSessions":15,"allBrowsers":"CHROME 13,CHROME 20,CHROME 35,CHROME 6,FIREFOX 12,FIREFOX 32,FIREFOX 47,INTERNET EXPLORER 10,INTERNET EXPLORER 28,INTERNET EXPLORER 35,SAFARI 17,SAFARI 29,SAFARI 39,SAFARI 49","usersStats":{"Leida Cira":{"sessionsCount":6,"totalTime":"455 min.","longestSession":"118 min.","browsers":"FIREFOX 12, INTERNET EXPLORER 28, INTERNET EXPLORER 28, INTERNET EXPLORER 35, SAFARI 29, SAFARI 39","usedIE":true,"alwaysUsedChrome":false,"dates":["2017-09-27","2017-03-28","2017-02-27","2016-10-23","2016-09-15","2016-09-01"]},"Palmer Katrina":{"sessionsCount":5,"totalTime":"218 min.","longestSession":"116 min.","browsers":"CHROME 13, CHROME 6, FIREFOX 32, INTERNET EXPLORER 10, SAFARI 17","usedIE":true,"alwaysUsedChrome":false,"dates":["2017-04-29","2016-12-28","2016-12-20","2016-11-11","2016-10-21"]},"Gregory Santos":{"sessionsCount":4,"totalTime":"192 min.","longestSession":"85 min.","browsers":"CHROME 20, CHROME 35, FIREFOX 47, SAFARI 49","usedIE":false,"alwaysUsedChrome":false,"dates":["2018-09-21","2018-02-02","2017-05-22","2016-11-25"]}}}' + "\n"
    parsed_expected = JSON.parse(expected_result)
    assert_equal parsed_expected, JSON.parse(File.read('result.json'))
  end
end