Filtering & sorting query dynamically

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Hi Guys,

I would like to let my user filtering my query by firstname, lastname and choose which sorting (descending or ascending)

I need to chain condition but i don't know how to do it

If filter = firstname & sort = descending
Then query with firstname descending
Else query with firstname ascending

OR

if filter = lastname & sort = descending 
Then query with lastname descending
Else query with lastname ascending

Etc etc..

Thanks for your help

Thomas

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