module Gitlab
  module Styles
    module Rubocop
      module Cop
        # This cop prevents usage of 'redirect_to' in actions 'destroy' without specifying 'status'.
        # See https://gitlab.com/gitlab-org/gitlab-ce/issues/31840
        class RedirectWithStatus < RuboCop::Cop::Cop
          MSG = 'Do not use "redirect_to" without "status" in "destroy" action'.freeze

          def on_def(node)
            return unless in_controller?(node)
            return unless destroy?(node) || destroy_all?(node)

            node.each_descendant(:send) do |def_node|
              next unless redirect_to?(def_node)

              methods = []

              def_node.children.last.each_node(:pair) do |pair|
                methods << pair.children.first.children.first
              end

              add_offense(def_node, :selector) unless methods.include?(:status)
            end
          end

          private

          def in_controller?(node)
            node.location.expression.source_buffer.name.end_with?('_controller.rb')
          end

          def destroy?(node)
            node.children.first == :destroy
          end

          def destroy_all?(node)
            node.children.first == :destroy_all
          end

          def redirect_to?(node)
            node.children[1] == :redirect_to
          end
        end
      end
    end
  end
end
