module Fiona7
  class WidgetResolver
    def initialize(widget_pool_value, klass=WriteObj)
      self.value = widget_pool_value
      self.klass = klass

      preload
    end

    attr_reader :id_map, :path_map, :instance_map

    protected
    attr_accessor :value, :klass
    attr_writer :id_map, :path_map, :instance_map

    def preload
      widget_id_to_object_id_map = Hash[
        self.value.map {|link| [link["title"], link["destination"]] }
      ]
      object_id_to_widget_instance_map = Hash[
        self.klass.where(obj_id: widget_id_to_object_id_map.values).map {|obj| [obj.id, obj] }
      ]

      self.id_map = widget_id_to_object_id_map.dup
      self.path_map = Hash[
        widget_id_to_object_id_map.map {|widget_id, obj_id|
          [widget_id, object_id_to_widget_instance_map[obj_id].path]
        }
      ]
      self.instance_map = Hash[
        widget_id_to_object_id_map.map {|widget_id, obj_id|
          [widget_id, object_id_to_widget_instance_map[obj_id]]
        }
      ]
    end
  end
end