# frozen-string-literal: true

module RuboCop
  module Cop
    module StatsD
      # This Rubocop will check for using the metaprogramming macros for positional
      # argument usage, which is deprecated. These macros include `statd_count_if`,
      # `statsd_measure`, etc.
      #
      # Use the following Rubocop invocation to check your project's codebase:
      #
      #     rubocop --only StatsD/MetaprogrammingPositionalArguments
      #       -r `bundle show statsd-instrument`/lib/statsd/instrument/rubocop/metaprogramming_positional_arguments.rb
      #
      #
      # This cop will not autocorrect the offenses it finds, but generally the fixes are easy to fix
      class MetaprogrammingPositionalArguments < Cop
        MSG = 'Use keyword arguments for StatsD metaprogramming macros'

        METAPROGRAMMING_METHODS = %i{
          statsd_measure
          statsd_distribution
          statsd_count_success
          statsd_count_if
          statsd_count
        }

        def on_send(node)
          if METAPROGRAMMING_METHODS.include?(node.method_name)
            arguments = node.arguments.dup
            arguments.shift # method
            arguments.shift # metric
            arguments.pop if arguments.last&.type == :block_pass
            case arguments.length
            when 0
            when 1
              add_offense(node) if arguments.first.type != :hash
            else
              add_offense(node)
            end
          end
        end
      end
    end
  end
end