csv.rb

require 'csv'
require 'ostruct'
require 'date'

filename = ARGV.first || 'movies.txt'

abort("Файл не найден") unless File.exist?(filename)

FIELDS = %i[link title year country premiere genre duration rank director cast]

ostruct_movie_arr = CSV.foreach(filename, col_sep: '|', headers: FIELDS )
  .map { |line| OpenStruct.new(line.to_h) }

puts "Статистика по месяцам"
ostruct_movie_arr
  .reject{ |movie| movie.premiere.length <= 5 }
  .map{|movie| Date.strptime(movie.premiere, '%Y-%m').mon}
  .each_with_object(Hash.new(0)){ |month, count| count[month] +=1 }
  .sort.map.each {|month, count| puts "#{Date::MONTHNAMES[month]} - #{count}"}

def movie_print(array_for_print)
  array_for_print.each { |movie| puts "#{movie.title} (#{movie.premiere}/ #{movie.genre}) - #{movie.duration}" }
end

sorted_ostruct_movie_arr = ostruct_movie_arr.sort_by { |movie| [movie.duration.to_i] }

puts "Пять самых длинных фильмов"
movie_print(sorted_ostruct_movie_arr.last(5))

comedy_ostruct_movie_arr = ostruct_movie_arr.select {|movie| movie.genre.include? "Comedy"}
  .sort_by(&:premiere)

puts "Десять самых старых комедий"
movie_print(comedy_ostruct_movie_arr.first(10))

puts "Режиссеры"
puts ostruct_movie_arr
  .map {|movie| movie.director}.uniq
    .sort_by {|name| name.split(/\W+/).last}

puts "Фильмов снято без участия США #{ostruct_movie_arr.count{|movie| !movie.country.include? "USA"}}"