gistfile1.txt

class Bottles
	
		def initialize
				@verses = {
					2 => LastButOneVerse::new,
					1 => LastVerse::new,
					0 => EpilogueVerse::new
				}

		    3.upto(99) do |index|
					@verses[index] = StandardVerse::new("#{index} bottles of beer",
																						 "#{index-1} bottles of beer")
				end		

					@verses[6] = StandardVerse::new("1 six-pack of beer",
																						 "5 bottles of beer")

		end

	def verse(line)
		return @verses[line].verse()
	end

	def song
		return verses(99, 0)
	end

	def verses(from, to)
		from.downto(to).map{|index| verse(index)}.join("\n")
	end
end

def format_verse(on_the_wall, action, remaining)
		 "#{on_the_wall.capitalize} on the wall, #{on_the_wall}.\n" +
			 	"#{action}, #{remaining} on the wall.\n"
end

class StandardVerse
		def initialize(on_the_wall, remaining)
				@on_the_wall = on_the_wall
				@remaining = remaining
		end

		def verse
				format_verse(
					@on_the_wall,
					"Take one down and pass it around", 
					@remaining)
		end
end

class LastButOneVerse
		def verse
				format_verse(
					"2 bottles of beer", 
					"Take one down and pass it around", 
					"1 bottle of beer") 
		end
end

class LastVerse
		def verse
				format_verse(
					"1 bottle of beer", 
					"Take it down and pass it around", 
					"no more bottles of beer") 
		end
end

class EpilogueVerse
		def verse
				format_verse(
					"no more bottles of beer", 
					"Go to the store and buy some more", 
					"99 bottles of beer") 
		end
end