# frozen_string_literal: true

module Karafka
  module Contracts
    # Contract for validating correctness of the server cli command options.
    class ServerCliOptions < Base
      configure do |config|
        config.error_messages = YAML.safe_load(
          File.read(
            File.join(Karafka.gem_root, 'config', 'locales', 'errors.yml')
          )
        ).fetch('en').fetch('validations').fetch('server_cli_options')
      end

      %i[
        include
        exclude
      ].each do |action|
        optional(:"#{action}_consumer_groups") { |cg| cg.is_a?(Array) }
        optional(:"#{action}_subscription_groups") { |sg| sg.is_a?(Array) }
        optional(:"#{action}_topics") { |topics| topics.is_a?(Array) }

        virtual do |data, errors|
          next unless errors.empty?

          value = data.fetch(:"#{action}_consumer_groups")

          # If there were no consumer_groups declared in the server cli, it means that we will
          # run all of them and no need to validate them here at all
          next if value.empty?
          next if (value - Karafka::App.consumer_groups.map(&:name)).empty?

          # Found unknown consumer groups
          [[[:"#{action}_consumer_groups"], :consumer_groups_inclusion]]
        end

        virtual do |data, errors|
          next unless errors.empty?

          value = data.fetch(:"#{action}_subscription_groups")

          # If there were no subscription_groups declared in the server cli, it means that we will
          # run all of them and no need to validate them here at all
          next if value.empty?

          subscription_groups = Karafka::App
                                .consumer_groups
                                .map(&:subscription_groups)
                                .flatten
                                .map(&:name)

          next if (value - subscription_groups).empty?

          # Found unknown subscription groups
          [[[:"#{action}_subscription_groups"], :subscription_groups_inclusion]]
        end

        virtual do |data, errors|
          next unless errors.empty?

          value = data.fetch(:"#{action}_topics")

          # If there were no topics declared in the server cli, it means that we will
          # run all of them and no need to validate them here at all
          next if value.empty?

          topics = Karafka::App
                   .consumer_groups
                   .map(&:subscription_groups)
                   .flatten
                   .map(&:topics)
                   .map { |gtopics| gtopics.map(&:name) }
                   .flatten

          next if (value - topics).empty?

          # Found unknown topics
          [[[:"#{action}_topics"], :topics_inclusion]]
        end
      end

      # Makes sure we have anything to subscribe to when we start the server
      virtual do |_, errors|
        next unless errors.empty?

        next unless Karafka::App.subscription_groups.empty?

        [[%i[include_topics], :topics_missing]]
      end
    end
  end
end