HELP!!!!! deleted system files in TWRP recovery by mistake, no OS, stuck at twrp.

Hey guys,
title pretty says it all,
while trying to uninstall xposed cause it was causing random rebooting, i by mistake deleted system files instead of caches :( and now it says no os, so i tried formatting everything and installing roms via adb sideload and now am stuck at samsung logo for 1 min then it reboots and do the same thing over and over again.

dont really know what to do, hope u guys can help, any suggestions ?