# frozen_string_literal: true

module Streams
  module DnsProviders
    # DNS lab in Redis (e dump hosts). Nessuna chiamata al registrar.
    class Lab < Base
      REDIS_KEY = "stream_dns:a_records"

      def initialize(redis: nil)
        @redis = redis
      end

      def upsert_a(name, ip)
        host = normalize(name)
        redis.hset(REDIS_KEY, host, ip.to_s)
        true
      end

      def delete_a(name)
        redis.hdel(REDIS_KEY, normalize(name))
        true
      end

      def resolve(name)
        redis.hget(REDIS_KEY, normalize(name))
      end

      def all_records
        redis.hgetall(REDIS_KEY)
      end

      def hosts_file_snippet
        all_records.sort.map { |host, ip| "#{ip}\t#{host}" }.join("\n")
      end

      private

      def normalize(name)
        name.to_s.strip.downcase.delete_suffix(".")
      end

      def redis
        @redis ||= Redis.new(url: ENV.fetch("REDIS_URL", "redis://localhost:6379/0"))
      end
    end
  end
end