module Karamzin

# File lib/karamzin.rb, line 17
def insert(str)
  @dictionary = Dictionary.new 'dictionary'
  words = filter_words str.split
  words.each do |word|
    index_in_dictionary = @dictionary.is_in_dictionary word
    if index_in_dictionary
      word_with_yo = make_word_with_yo(word, index_in_dictionary)
      index = str.index word
      next if index.nil?
      str.gsub! str[index..(index + word.length - 1)], equate_words_register(word, word_with_yo)
    end
  end
  str
end

# File lib/karamzin.rb, line 32
def make_word_with_yo(word, index_in_dictionary)
  word_with_yo = @dictionary[first_letter_in(word)][index_in_dictionary]
  index = @dictionary.indexes[first_letter_in(word)][index_in_dictionary].to_i
  letter = word[index]
  if letter == E_LETTER
    word_with_yo[index] = YO_LETTER
  elsif letter == BIG_E_LETTER
    word_with_yo[index] = BIG_YO_LETTER
  end
  word_with_yo
end