Antalya Airport has three passenger terminals. Terminal 1 and Terminal 2 handle international flights, and the Domestic terminal handles flights within Turkey, for example from Istanbul or Ankara. There is no simple rule such as "Terminal 1 is for one country and Terminal 2 for another": the terminal is decided by your airline and can differ between airlines, seasons and even individual flights.
So the honest answer to "Antalya Airport Terminal 1 or 2?" is: look at your own flight details. Your booking confirmation, boarding pass or airline app is the reliable source, not a list you found somewhere online. Terminal allocations change, and an outdated list is the most common reason travellers end up at the wrong building on their way home.