class Deluminator

# File lib/deluminator.rb, line 15
def initialize(hash = {})
  raise "Deluminator.new expects a hash" unless hash.is_a?(Hash)
  @length_indexed_dict = hash[:length_indexed_dict] || {}
  @reserved   = hash[:reserved]   || []
  raise ":reserved value must be an array"   unless @reserved.is_a?(Array)
  raise ":length_indexed_dict value must be a hash" unless @length_indexed_dict.is_a?(Hash)
  raise ":length_indexed_dict keys must be integers" unless @length_indexed_dict.keys.all? { |k| k.is_a?(Integer) }
end

# File lib/deluminator.rb, line 23
def add_to_dictionary(text)
  text.split(/\s+|[^a-zA-z]+/).each do |word|
    add_one_word_to_dictionary(word)
  end
end

# File lib/deluminator.rb, line 38
def deluminate(text)
  result = text
  # Replace the longer words first, to ensure we don't corrupt them if they contain shorter words
  # (we *assume* that our random replacements don't ever match a substring of a longer replacement string -
  #  which is probably a good bet since the odds are close to 1 in 26**4 or 1:456976)
  @length_indexed_dict.keys.sort.reverse.each do |word_len|
    @length_indexed_dict[word_len].each do |word, replacement|
      #regexp = Regexp.new("\\b#{word}\\b")
      regexp = Regexp.new(word)
      result.gsub!(regexp, replacement)
    end
  end
  result
end

# File lib/deluminator.rb, line 30
def dictionary
  hash = {}
  @length_indexed_dict.each do |len, words_of_same_length|
    hash.merge! words_of_same_length
  end
  hash
end

# File lib/deluminator.rb, line 55
def add_one_word_to_dictionary(word)
  return word if word.nil? || word.length < MIN_DICTIONARY_LENGTH || @reserved.include?(word)

  @length_indexed_dict[word.length] ||= {}
  return @length_indexed_dict[word.length][word] if @length_indexed_dict[word.length][word]

  result = transmute(word)
  existing = @length_indexed_dict[word.length].values
  while existing.include?(result) do
    result = result.next   # "aaaa".next=="aaab"
  end
  @length_indexed_dict[word.length][word] = result
  #puts @length_indexed_dict.inspect
  @length_indexed_dict[word.length][word]
end

# File lib/deluminator.rb, line 71
def transmute(word)
  word.split('').collect do |letter|
    if UPPERS.include?(letter)
      if UPVOWELS.include?(letter)
        UPVOWELS[rand(VOWEL_LEN)]
      else
        UPPERS[rand(NONVOWEL_LEN)]
      end
    else
      if LOWVOWELS.include?(letter)
        LOWVOWELS[rand(VOWEL_LEN)]
      else
        LOWERS[rand(NONVOWEL_LEN)]
      end
    end
  end.join
end