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might_i_recommend_ruby.rb
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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 |
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