module Pagy::UseOverflowExtra

def initialize(vars)
  @overflow ||= false                         # don't override if :last_page re-run the method after an overflow
  super
rescue OverflowError
  @overflow = true                            # add the overflow flag
  case @vars[:overflow]
  when :exception
    raise                                     # same as without the extra
  when :last_page
    initial_page = @vars[:page]               # save the very initial page (even after re-run)
    initialize vars.merge!(page: @last)       # re-run with the last page
    @vars[:page] = initial_page               # restore the inital page
  when :empty_page
    @offset = @items = @from = @to = 0        # vars relative to the actual page
    @prev = @last                             # prev relative to the actual page
    extend Series                             # special series for :empty_page
  else
    raise VariableError.new(self), "expected :overflow variable in [:last_page, :empty_page, :exception]; got #{@vars[:overflow].inspect}"
  end
end

def overflow?
  @overflow
end