# Current week:
#   Week.new
# Firt week of the year:
#   Week.new(1)
# First week of 2006 year
#   Week.new(2006, 1)
class Week
  attr_reader :starts_at, :ends_at

  def initialize(*args)
    if args.size == 0
      year, week = Date.today.year, Date.today.cweek
    elsif args.size == 1
      year, week = Date.today.year, args[0]
    elsif args.size == 2
      year, week = args
    else
      raise ArgumentError, 'wrong number of arguments (0, 1 or 2)'
    end

    @starts_at = Date.commercial(year, week, 1)
    @ends_at = @starts_at + 6
  end

  def to_s
    "#{@starts_at.day} - #{@ends_at.day}"
  end

  def self.all_of_month(month)
    []
  end
end