class Pagy::Calendar

def initialize(vars) # rubocop:disable Lint/MissingSuper
  raise InternalError, 'Pagy::Calendar is a base class; use one of its subclasses' if instance_of?(Pagy::Calendar)
  vars = self.class::DEFAULT.merge(vars)  # subclass specific default
  normalize_vars(vars)                    # general default
  setup_vars(page: 1)
  setup_unit_vars
  setup_params_var
  raise OverflowError.new(self, :page, "in 1..#{@last}", @page) if @page > @last
  @prev = (@page - 1 unless @page == 1)
  @next = @page == @last ? (1 if @vars[:cycle]) : @page + 1
end