class Bottles

    def verse(part)
        "#{bottle(part)[0]} of beer on the wall, #{bottle(part)[1]} of beer.\n".capitalize() +
        "#{part == 0 ? "Go to the store and buy some more" : "Take #{part == 1 ? "it" : "one"} down and pass it around"}" +
        ", #{bottle(part)[2]} of beer on the wall.\n"
    end

    def verses(first_verse, second_verse)
        final_string = ""
        array = build_array(first_verse, second_verse)
        array.each_with_index do |part, index|
            final_string += verse(part)
            break if index == array.length - 1
            final_string += "\n"
        end
        final_string
    end

    def song
        verses(99, 0);
    end

    def build_array(start_num, end_num)
        array = []
        start = start_num
        counter = 0
        while start != end_num - 1
            array[counter] = start
            start = start - 1
            counter = counter + 1
        end
        array
    end

    def number_wheel(number)
        return 99 if number == 0
        number - 1
    end

    def bottle(amount)
        first = amount
        second = amount
        last = number_wheel(amount)

        [singular_or_plural(first), singular_or_plural(second), singular_or_plural(last)]
    end

    def singular_or_plural(number)
        return "no more bottles" if number == 0
        number == 1 ? "#{number} bottle" : "#{number} bottles"
    end
end