I need someone get perfect correct max drawdown calculation for my indicator.

My indicator always show wrong MAX Drawdown %.

I google search mql4 code imposible to get history of Account_Equity()
reference : https://www.forexfactory.com/thread/219277-history-of-accountequity

So I think it is impossible to get the drawdown % of particular day in history.

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I try my own calculation but i still feel bug every where :

Deposited 100

Code check trade history

day 1:

1st Trade closed +3

2nd Trade closed -1

3rd Trade closed -2

4th trade closed -6

So total up profit & loss of all trades = -6

So I assuming max dd is -6%  

Then code check current open trade :

current floating trades losing -15%

So I assuming total max dd is -6%   +   -15  =  -21%

But here I see a bug there was too big gap between deposited date (30 Oct 1999) and today floating date (15 June 2022). So how to fix the bug?

Ok solution is As we know when all trade close, when there is 0 floating trade, then capital is equal to equity, so update deposit value from 100 to 150 if current balance is 150 and 0 floating trade now. 

I think it is very bad solution. Anyone has better solution to calculate max dd % ?