Macro For attack rolls for Custom system

So I'm in a game with a custom system and I have no idea how to make a macro/API script for attack rolls In this system when you roll maximum on a dice you double the lowest dice roll (Excluding 1 or another max roll), you can double a roll twice and if you roll a 1 you remove the lowest non-1 roll. The system only uses d6,d8,d10,d12 so if I roll 3d8 and get 2,3,8. it would be 15 instead of 13 or if I roll 1,3,7 it would be 8 total.  if you roll both a 1 and 8 they cancel each other. so 1,4,8, it would still be only 13.  another criteria is that 8 and 1 only affect each other when there is no other option so for example 2,8,8. 2 would be doubled then since 2 is already doubled then the 8 would be doubled. Same with 1 where if 1,1,3 is rolled the 3 is removed and since its only two 1s left then the roll total is 1.

When you say, "You can double a roll twice" do you mean that you can respond to no more than 2 max-die-results? So, if you roll 4d8 and get: 2,8,8,8 You would total 36 (even though you got three 8s, you would only use 2 of them to double, and they would double different numbers)... OR Do you mean that a single die can be doubled more than once, so give the same result on 4d8 (2,8,8,8), you would effectively double the 2 twice, but then the third 8 would have to double a new number, so it would double an 8? In this case, your total would be 38?

I meant to say "Can't" My bad I meant  You can't double the same roll twice. So 2,8,8,8 would be 4+16+16+8, so the roll would be 44. So if you roll all 8s the its just doubled

also, a critical hit in the system is when you roll more than the max total without doubling, so 3d8 would crit if you get over 25. a feature that lets you crit when equal and more instead of only more