food_chain for exercism

food_chain.rb

require 'pry'

class FoodChain

  ANIMALS = {'fly' => 'I don\'t know why she swallowed the fly. Perhaps she\'ll die.',
             'spider' => 'that wriggled and jiggled and tickled inside her.',
             'bird' => 'How absurd to swallow a bird!',
             'cat' => 'Imagine that, to swallow a cat!',
             'dog' => 'What a hog, to swallow a dog!',
             'goat' => 'Just opened her throat and swallowed a goat!',
             'cow' => 'I don\'t know how she swallowed a cow!'
  }

  def self.song
    @song = ''
    ANIMALS.size.times do |i|
      @song += <<-cancion
        #{stanzas(i)}
      cancion
    end
    binding.pry
  end

  def self.stanzas i
    return first_stanza if i == 0
    return second_stanza if i == 1
    @stanza = ''
    @stanza = <<-stanza
    I know an old lady who swallowed a #{ANIMALS.keys[i]}.
    #{ANIMALS[ANIMALS.keys[i]]}
    #{swallowing_chain(i)}
    #{ANIMALS[ANIMALS.keys[0]]}
    stanza
  end

  def self.swallowing_chain c
    return spider_verse if c == 2
    @chain = ''
    @chain = <<-chain
      She swallowed the #{ANIMALS.keys[c]} to catch the #{ANIMALS.keys[c-1]}
      #{swallowing_chain(c-1)}
    chain
  end

  def self.first_stanza
    @stanza = ''
    @stanza = <<-stanza
      I know an old lady who swallowed a #{ANIMALS.keys[0]}.
      #{ANIMALS[ANIMALS.keys[0]]}
    stanza
  end

  def self.second_stanza
    @stanza = ''
    @stanza = <<-stanza
    I know an old lady who swallowed a #{ANIMALS.keys[1]}.
    It wriggled and jiggled and tickled inside her.
    She swallowed the #{ANIMALS.keys[1]} to catch the #{ANIMALS.keys[0]}
    #{ANIMALS[ANIMALS.keys[0]]}
    stanza
  end

  def self.spider_verse
    "She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her.\nShe swallowed the spider to catch the fly."
  end

end