module RuboCop::Cop::RSpec::AggregateExamples::Its

def example_metadata(example)
  return super unless its?(example.send_node)
  # First parameter to `its` is not metadata.
  example.send_node.arguments[1..-1]
end

def its?(node)
  node.method_name == :its
end

def new_body(node)
  return super unless its?(node)
  transform_its(node.body, node.send_node.arguments)
end

def transform_its(body, arguments)
  argument = arguments.first
  replacement =
    case argument.type
    when :array
      key = argument.values.first
      "expect(subject[#{key.source}])"
    else
      property = argument.value
      "expect(subject.#{property})"
    end
  body.source.gsub(/is_expected|are_expected/, replacement)
end