#!/usr/bin/env ruby
# frozen_string_literal: true

require_relative '../config/bundler_setup'
require 'rubocop'

MINIMUM_MAX_FILES_IN_CACHE_MARGIN = 1.05
RECOMMENDED_MAX_FILES_IN_CACHE_MARGIN = 1.25
RUBOCOP_LIST_TARGET_FILES_COMMAND = 'bundle exec rubocop --list-target-files | wc -l'

RuboCopMaxFilesInCacheIsTooSmall = Class.new(StandardError)

rubocop_target_files_count = `#{RUBOCOP_LIST_TARGET_FILES_COMMAND}`.strip.to_i

raise Error, "#{RUBOCOP_LIST_TARGET_FILES_COMMAND} failed with status #{$?}!" if rubocop_target_files_count == 0

rubocop_target_files_count = rubocop_target_files_count.to_i
rubocop_current_max_files_in_cache = RuboCop::ConfigLoader.load_yaml_configuration(File.expand_path('../.rubocop.yml', __dir__)).dig('AllCops', 'MaxFilesInCache').to_i
minimum_max_files_in_cache = (rubocop_target_files_count * MINIMUM_MAX_FILES_IN_CACHE_MARGIN).round(-3)

# We want AllCops.MaxFilesInCache to be at least 5% above the actual files count at any time to give us enough time to increase it accordingly
if rubocop_current_max_files_in_cache <= minimum_max_files_in_cache
  recommended_max_files_in_cache = (rubocop_target_files_count * RECOMMENDED_MAX_FILES_IN_CACHE_MARGIN).round(-3)
  raise RuboCopMaxFilesInCacheIsTooSmall, "Current count of RuboCop target file is #{rubocop_target_files_count} but AllCops.MaxFilesInCache is set to #{rubocop_current_max_files_in_cache}. We recommend to increase it to #{recommended_max_files_in_cache}."
else
  puts "Current count of RuboCop target file is #{rubocop_target_files_count} and AllCops.MaxFilesInCache is set to #{rubocop_current_max_files_in_cache}. All good."
  exit(0)
end