99_bottles.rb

# 99 Bottles - Pre Thoughts
# Here is my initial thoughts on the problem in the book

class Song
  MAYBE_S = -> x { x != 1 ? 's ' : ' '} #check this

  def initialize(number_of_bottles: 99, take: 101)
    @bottle_sequence = number_of_bottles.downto(0).cycle.take(take).freeze
  end

  def call
    @song ||= @bottle_sequence.inject('', &method(:apply_stanza))
  end

  private def apply_stanza(mutable_reference, next_line)
    mutable_reference += stanza(next_line)
  end

  def stanza(n)
    if n > 1
      "#{n} bottles of beer on the wall, "\
      "#{n} bottles of beer.\n"\
      'Take one down, pass it around, '\
      "#{n - 1} bottle#{MAYBE_S[n - 1]}of beer on the wall...\n"
    elsif n.eql?(1)
      "#{n} bottle of beer on the wall, "\
      "#{n} bottle of beer.\n"\
      "If that one bottle should happen to fall, what a waste of alcohol!\n"
    elsif n.eql?(0)
      "No more bottles of beer on the wall, no more bottles of beer.\n"\
      "Go to the store and buy some more, 99 bottles of beer on the wall...\n"
    end
  end
end