might_i_recommend_ruby.rb

might_i_recommend_ruby.rb

require 'uri'
require 'net/http'
require 'csv'

class Downloader
  attr_accessor :uri, :content

  def initialize(uri)
    @uri = URI(uri)
    @content = nil
  end

  def download
    response = Net::HTTP.get_response(uri)
    @content = response.body if response.is_a?(Net::HTTPSuccess)
  end
end

class CompactDisk
  LIMIT = 120
  attr_accessor :rows, :entries

  def initialize(content, headers = true)
    @rows = CSV.parse(content, headers: headers)
    @entries = {}
  end

  def songs_per_url
    @rows.each_with_object({}) do |row, hash|
      key = row['url']
      hash[key] = [] unless hash.key?(row['url'])
      hash[key].push([row['filename'], row['size in kilobytes']])
    end
  end

  def playlist
    results = {}
    songs_per_url.each do |key, songs|
      size = songs.map {|song| song[1].to_i }.sum / 1024
      if size > LIMIT
        0.upto(size/LIMIT) do |i|
          k = [key, i].join('_')
          results[k] = []
          songs.each do |song|
            break if results[k].map {|song| song[1].to_i }.sum / 1024 > LIMIT
            results[k].push(song)
          end
          songs -= results[k]
          next
        end
      else
        results[key] = songs
      end
    end
    results
  end
end


url = 'https://gist.githubusercontent.com/Schwad/9938bc64a88727a3ab2eaaf9ee63c99a/raw/6519e28c85820caac2684cfbec5fe4af33f179a4/rows_of_sweet_jams.csv'
downloader = Downloader.new(url)
downloader.download
compact_disk  = CompactDisk.new(downloader.content)
pp compact_disk.playlist