load "entities/entity.rb"
load "entities/player.rb"
load "entities/monster.rb"
load "entities/boss.rb"
load "entities/random_event.rb"

class EntityFactory
  @mc = nil

  def initialize(mc)
    @mc = mc
  end

  # Convert the symbol into a class.  There might be a way to automate this better...
  # Make sure to load the class if you're adding a new one here.
  def get_ent_class(type)
    ent_class = nil

    case type
      when :player
        ent_class = Player
      when :monster
        ent_class = Monster
      when :boss
        ent_class = Boss
      when :random_event
        ent_class = RandomEvent
    end

    return ent_class
  end

  # get a new entity if doc is nil, otherwise load from that doc
  def get(type, doc=nil)
    return get_ent_class(type).new(@mc, doc)
  end

  # try to load an object instance of an entity based on the doc
  def build_instance(doc)
    if doc['type'] != nil then
      return get_ent_class(doc['type']).new(@mc, doc)
    else
      return nil
    end
  end

  def run_query(filter={})
    return @mc.collection().find(filter)
  end
end