module Fiona7
  class PermissionVolatileCache
    PERMISSION_KEY = "F7PERMISSION_CACHE"

    def initialize(request)
      request[PERMISSION_KEY] ||= {}
      self.storage = request[PERMISSION_KEY]
    end

    def permitted?(user_name, obj_id, action)
      self.storage["#{user_name}:#{obj_id}:#{action}"] ||= lookup(user_name, obj_id, action)
    end

    protected
    attr_accessor :storage

    def lookup(user_name, obj_id, action)
      return false unless user_name && obj_id && action

      obj = Fiona7::EditedObj.new
      obj.obj_id = obj_id.to_i
      return obj.permission.send(:"#{action}?", user_name)
    rescue Reactor::Cm::XmlSingleRequestError => e
      Rails.logger.error("Error looking up the permission of #{user_name} for obj #{obj_id} for action #{action}:\n#{e.message}")
      return false
    end
  end
end