Define the highest high before MACD value crosses below average

The following solution tracks the highest since since the last time value crossed above average. After the value crosses below the average it retains the previous highest high until the next reset. The line resets each time the value crosses back above the average.

input fastLength = 12;
input slowLength = 26;
input macdLength = 9;
input macdAverageType = AverageType.EXPONENTIAL;
def value = MovingAverage(macdAverageType, close, fastLength) - MovingAverage(macdAverageType, close, slowLength);
def average = MovingAverage(macdAverageType, value, macdLength);
def crossAbove = value[1] < average[1] and value > average;
def crossBelow = value[1] > average[1] and value < average; rec trackHigh = if crossAbove then high else if value > average and high > trackHigh[1] then high else trackHigh[1];
plot highestSinceCross = trackHigh;
highestSinceCross.SetDefaultColor(Color.DARK_GREEN);