require 'date'

def days_until_xmas(today = Date.today)
  # TODO Return the number of days before Christmas

  # Determine the christmas date
  christmas = Date.new(today.year, 12, 25)

  # Change the year of christmas if today is passed the 25th
  if today > christmas
    christmas = Date.new(today.year+1, 12, 25)
  end

  # Count the number of days between christmas day and today
  days_remaining = christmas - today

  # Return the results as an integer
  return days_remaining.to_i
end

puts days_until_xmas()

# We want to display "true" to test our method (TDD)
puts days_until_xmas(Date.today).class == Integer

puts days_until_xmas(Date.today) == 169 # As of 2019, 07, 09
puts days_until_xmas(Date.new(2018,12,25)) == 0
puts days_until_xmas(Date.new(2020,12,26)) == 364