Is there a way to generate a new variable only if it meets certain criteria?

I am trying to replicate the following Stata code in R:

gen UAPDL_1=sqrt((((Sanchez_1-Iglesias_1)^2)+((Casado_1-Iglesias_1)^2)+((Rivera_1-Iglesias_1)^2))/3) if maxIglesias_1==1

replace UAPDL_1=sqrt((((Sanchez_1-Rivera_1)^2)+((Casado_1-Rivera_1)^2)+((Iglesias_1-Rivera_1)^2))/3) if maxRivera_1==1

In other words, I am trying to make different calculations and generate a new variable with different values depending on certain conditions (in this case, they have value 1 in an another variable. I managed to create the variables to be met for making the calculation (maxIglesias==1 and maxRivera==1), but I am stuck in the generation of the UAPDL variable. I tried with case_when and ifelse, but in these cases these commands only let you define a certain value. Is there a way with mutate or dplyr (or any other package) to achieve this goal?

Thanks in advance for your assistance.

Best,

Danilo