# encoding: utf-8
# copyright: 2015, Dominik Richter
# license: All rights reserved

class VulcanoBaseRule
  def initialize(id, opts, &block)
    @id = id
    @impact = nil
    @__code = ""
    @__block = block
    @title = nil
    @desc = nil
    # not changeable by the user:
    @profile_id = nil
    @checks = []
    # evaluate the given definition
    self.instance_eval(&block) if block_given?
  end

  def id(v = nil)
    # never overwrite the ID
    @id
  end

  def impact(v = nil)
    @impact = v unless v.nil?
    @impact
  end

  def title(v = nil)
    @title = v unless v.nil?
    @title
  end

  def desc(v = nil)
    @desc = v unless v.nil?
    @desc
  end

  def self.merge dst, src
    if src.id != dst.id
      # TODO: register an error, this case should not happen
      return
    end
    sp = src.instance_variable_get(:@profile_id)
    dp = dst.instance_variable_get(:@profile_id)
    if sp != dp
      # TODO: register an error, this case should not happen
      return
    end
    # merge all fields
    dst.impact(src.impact) if src.impact != nil
    dst.title(src.title)   if src.title != nil
    dst.desc(src.desc)     if src.desc != nil
    # merge indirect fields
    # checks defined in the source will completely eliminate
    # all checks that were defined in the destination
    sc = src.instance_variable_get(:@checks)
    unless sc.nil? || sc.empty?
      dst.instance_variable_set(:@checks, sc)
    end
  end

  # Get the full id consisting of profile id + rule id
  # for the rule. If the rule's profile id is empty,
  # the given profile_id will be used instead and also
  # set for the rule.
  def self.full_id profile_id, rule
    if rule.is_a?(String) or rule.nil?
      rid = rule
    else
      # As the profile context is exclusively pulled with a
      # profile ID, attach it to the rule if necessary.
      rid = rule.instance_variable_get(:@id)
      if rid.nil?
        # TODO: Message about skipping this rule
        # due to missing ID
        return nil
      end
    end
    pid = rule.instance_variable_get(:@profile_id)
    if pid.nil?
      rule.instance_variable_set(:@profile_id, profile_id)
      pid = profile_id
    end
    if pid.nil? or pid.empty?
      return rid
    else
      return "#{pid}/#{rid}"
    end
  end
end