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unless ARGV.size == 2
  puts "USAGE: ruby draw_something.rb ACKRCKOOLCWZ 5"
  exit 1
end

letters = ARGV[0].downcase.split(//).sort
length = ARGV[1].to_i

require 'open-uri'
uri = 'http://static.iminlikewithyou.com/drawsomething/wordlist.csv'
words = open(uri) { |resource| resource.read }.split("\n")
words = words.map { |words| words.split(',').first }
words = words.select { |word| word.length == length }

def valid?(word, letters)
  word_index = letters_index = 0
  while word_index < word.length && letters_index < letters.length
    if word[word_index] == letters[letters_index]
      word_index = word_index + 1
    end
    letters_index = letters_index + 1
  end
  return word_index == word.length
end

guesses = []
words.each do |word|
  guesses << word if valid?(word.split(//).sort, letters)
end

guesses.each do |guess|
  puts guess
end