MACD Multi Timeframe

The following tutorial video is almost everything I have to say on the topic:

https://www.hahn-tech.com/thinkorswim-mtf-macd-indicator/

"Almost everything"? Yes, I do have a few more things to say and they are explained in the following video:

https://www.hahn-tech.com/thinkorswim-strategy-guide-mtf/

Edit: After receiving feedback on this post I decided to provide a complete solution that achieves the specific goals that are implied by the example code provided in the question of this post. The solution is much more complex than the example code permits. So I had to write this from scratch.

input fastLength = 12;
input slowLength = 26;
input macdLength = 9;
input macdAverageType = AverageType.EXPONENTIAL;
input timeFrameOne = AggregationPeriod.THIRTY_MIN;
def value = MovingAverage(macdAverageType, close(period = timeFrameOne), fastLength) - MovingAverage(macdAverageType, close(period = timeFrameOne), slowLength);
def average = MovingAverage(macdAverageType, value, macdLength);
def diff = value - average;
def crossAbove = value[1] < average[1] and value > average;
def crossBelow = value[1] > average[1] and value < average;
AddLabel(yes, "30 Min", if crossAbove then Color.GREEN else if crossBelow then Color.RED else Color.WHITE);