class SlackSmartBot
  # list of available emojis: https://www.webfx.com/tools/emoji-cheat-sheet/
  # unreact(:thumbsup)
  # ts: can be true, false or a specific ts
  def unreact(emoji, ts=false)
    if ts.is_a?(TrueClass) or ts.is_a?(FalseClass)
      parent = ts
      ts = nil
    else
      parent = false
    end
    if ts.nil?
      if parent or Thread.current[:ts].to_s == ''
        ts = Thread.current[:thread_ts]
      else
        ts = Thread.current[:ts]
      end
    end
    if ts.nil?
      @logger.warn 'unreact method no ts supplied'
    else
      begin
        client.web_client.reactions_remove(channel: Thread.current[:dest], name: emoji, timestamp: ts) unless config.simulate
      rescue Exception => stack
        @logger.warn stack
      end
    end
  end
end