module Makura
  class UUIDCache
    attr_accessor :min, :max, :server, :pretty

    def initialize(server, min = 500, max = 1500, pretty = true)
      @server, @min, @max, @pretty = server, min, max, pretty
      @uuids = []
    end

    def next
      fetch if @uuids.size < min
      @uuids.shift
    end

    def fetch(count = 0)
      todo = max - @uuids.size
      count = [min, todo, max].sort[1]
      uuids = @server.get('/_uuids', :count => count)['uuids']
      uuids.map!{|u| Makura.pretty_from_md5(u) } if pretty
      @uuids.concat(uuids)
    end
  end
end