#
# Copyright:: 2019, Chef Software Inc.
# Author:: Tim Smith (<tsmith@chef.io>)
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
module RuboCop
  module Cop
    module Chef
      # Incorrectly using node methods for Ohai data when you really want node attributes
      #
      # @example
      #
      #   # bad
      #   node.fqdn
      #   node.platform
      #   node.platform_family
      #   node.platform_version
      #   node.hostname
      #
      #   # good
      #   node['fqdn']
      #   node['platform']
      #   node['platform_family']
      #   node['platform_version']
      #   node['hostname']
      #
      class NodeMethodsInsteadofAttributes < Cop
        MSG = 'Use node attributes to access Ohai data instead of node methods, which were deprecated in Chef Infra Client 13.'.freeze

        def_node_matcher :node_ohai_methods?, <<-PATTERN
          (send (send nil? :node) #non_nested_ohai_attribute?)
        PATTERN

        def on_send(node)
          node_ohai_methods?(node) do
            add_offense(node, location: :selector, message: MSG, severity: :refactor)
          end
        end

        def autocorrect(node)
          lambda do |corrector|
            corrector.replace(node.loc.expression, "node['#{node.method_name}']")
          end
        end

        private

        def non_nested_ohai_attribute?(attribute)
          %i(
            current_user
            domain
            fqdn
            hostname
            ip6address
            ipaddress
            macaddress
            machinename
            ohai_time
            os
            os_version
            platform
            platform_build
            platform_family
            platform_version
            root_group
            shard_seed
            uptime
            uptime_seconds).include?(attribute)
        end
      end
    end
  end
end