hiptest/i18n-coverage

require 'i18n/coverage/key_lister'
require 'i18n/coverage/key_logger'

module I18n
  module Coverage
    class Reporter
      def self.report
        Reporter.new.report
      end

      def initialize
        @existing_keys = KeyLister.list_keys
        @stored_keys = KeyLogger.stored_keys
      end

      def report
        I18n::Coverage.config.printer.print(hash_report)
      end

      def hash_report
        used_keys = @existing_keys - unused_keys
        percentage_used = (used_keys.count.to_f / @existing_keys.count) * 100

        {
          key_count: @existing_keys.count,
          used_key_count: used_keys.count,
          percentage_used: percentage_used,
          unused_keys: unused_keys.to_a
        }
      end

      private

      def unused_keys
        @unused_keys ||= @existing_keys.reject do |key|
          @stored_keys.any? { |stored_key| key.start_with?(stored_key.to_s) }
        end
      end
    end
  end
end