#    Copyright 2010 Diaspora Inc.
#
#    This file is part of Diaspora.
#
#    Diaspora is free software: you can redistribute it and/or modify
#    it under the terms of the GNU Affero General Public License as published by
#    the Free Software Foundation, either version 3 of the License, or
#    (at your option) any later version.
#
#    Diaspora is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU Affero General Public License for more details.
#
#    You should have received a copy of the GNU Affero General Public License
#    along with Diaspora.  If not, see <http://www.gnu.org/licenses/>.
#


class Retraction
  include ROXML
  include Diaspora::Webhooks

  xml_accessor :post_id
  xml_accessor :person_id
  xml_accessor :type

  attr_accessor :post_id
  attr_accessor :person_id
  attr_accessor :type

  def self.for(object)
    retraction = self.new
    if object.is_a? User
      retraction.post_id = object.person.id
      retraction.type = object.person.class.to_s
    else
      retraction.post_id = object.id
      retraction.type = object.class.to_s
    end
    retraction.person_id = person_id_from(object)
    retraction
  end

  def perform receiving_user_id
    Rails.logger.debug "Performing retraction for #{post_id}"
    begin
      Rails.logger.debug("Retracting #{self.type} id: #{self.post_id}")
      target = self.type.constantize.first(:id => self.post_id)
      target.unsocket_from_uid receiving_user_id if target.respond_to? :unsocket_from_uid
      target.destroy
    rescue NameError
      Rails.logger.info("Retraction for unknown type recieved.")
    end
  end

  def self.person_id_from(object)
    object.is_a?(Person) ? object.id : object.person.id
  end
  
  def person
    Person.find_by_id(self.person_id)
  end

end