module Youtube
  # Evita tempeste di chiamate YouTube Data API (quota / userRequestsExceedRateLimit).
  class ApiThrottle
    KEY = "youtube_api:rate_limited_until"

    class << self
      def rate_limited?
        until_ts = redis.get(KEY).to_i
        until_ts.positive? && until_ts > Time.now.to_i
      end

      def mark_rate_limited!(seconds: 120)
        redis.set(KEY, (Time.now.to_i + seconds), ex: seconds + 30)
      end

      def rate_limit_error?(message)
        msg = message.to_s
        msg.include?("userRequestsExceedRateLimit") || msg.include?("rate limit")
      end

      private

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