rankk best next challenges

#!/usr/bin/env ruby

require "httparty"
require "nokogiri"

class ChallengesSolves
  def initialize(user)
    @user = user
  end

  def solves
    @solves ||= Pathname("#{__dir__}/rankk_solves.txt")
      .readlines
      .map(&:chomp)
      .map{|line| line.split("\t")}
      .map{|id, count| [id, count.to_i]}
      .to_h
  end

  def solved_by_user
    @solved_by_user ||= begin
      doc = Nokogiri::HTML(HTTParty.get("https://www.rankk.org/user/#{@user}"))
      doc.css(".solved li").map{|li|
        a, b = li.text[/\S+/].split("/")
        "%d/%02d" % [a, b]
      }
    end
  end

  def call
    solves
    solved_by_user
    report = solves
      .map{|id,count|
        [-count, id, solved_by_user.include?(id) ? "DONE" : ""]
      }
      .sort
      .map{|c,i,s| [-c,i,s] }
    report.each do |row|
      puts row.join("\t")
    end
  end
end

ChallengesSolves.new("taw").call