javasweeper/Sound.java

import java.io.*;
import javax.sound.sampled.*;

public enum Sound {
	// The available sound filenames
	WIN("win.wav"),
	TICK("tick.wav"),
	EXPLODE("explode.wav"),
	SILENT("silent.wav");

	// The directory all the audio files are in
	public static final String AUDIO_DIR = "Audio";

	// Named pipe to send audio requests to on Replit
	public static final File REPLIT_PIPE = new File("/tmp/audio");

	// Use env vars and the existance of the above pipe to determine if running inside Replit
	public static final boolean REPLIT_API = System.getenv("REPL_ID") != null && REPLIT_PIPE.exists();

	// Whether the clips have been initialized yet
	private static boolean soundsInitialized = false;

	// File containing the sound
	private final File FILE;

	// SoundBackend that will play the sound
	private SoundBackend soundBackend;

	// Because Replit does audio totally differently from desktop Java (it
	// supposedly supports PulseAudio over VNC but I just could not get that
	// working), and I would like to still be able to hear things when I play
	// the game directly on my laptop, we have a SoundBackend interface that is
	// implemented by both a builtin javax.sound.sampled-powered backend and a
	// Replit specific one
	private interface SoundBackend {
		// plays the specific sound
		public void play();
	}

	private class NativeBackend implements SoundBackend {
		// The audio clip associated with the sound
		private final Clip CLIP;

		public NativeBackend() {
			// Create the clip, if possible
			Clip clip;
			try (AudioInputStream audioIn = AudioSystem.getAudioInputStream(FILE)) {
				clip = AudioSystem.getClip();
				clip.open(audioIn);
			} catch (Exception e) {
				// If it didn't work, don't leave a broken clip behind that
				// would try to get played
				clip = null;
			}
			CLIP = clip;
		}

		@Override
		public void play() {
			// Don't play if the clip couldn't be initialized
			if (CLIP == null)
				return;

			// Rewind the clip and play it
			CLIP.stop();
			CLIP.setFramePosition(0);
			CLIP.start();
		}
	}

	private class ReplitBackend implements SoundBackend {
		// The JSON format to send requests to Replit with; the volume is 0.1
		// because my ears got blown out the first time I exploded when it was
		// at 100% volume (Replit is LOUD)
		private static final String REQUEST_FORMAT = """
				{
					"Volume": 0.1,
					"Type": "wav",
					"Args": {
						"Path": "%s"
					}
				}""";

		// The actual request string to send
		private final String REQUEST;

		public ReplitBackend() {
			REQUEST = String.format(REQUEST_FORMAT, FILE);
		}

		@Override
		public void play() {
			// Attempt to send the request
			try (FileWriter writer = new FileWriter(REPLIT_PIPE)) {
				writer.write(REQUEST);
			} catch (IOException ignore) {
				// If it didn't work, no biggie, just don't play anything
			}
		}
	}

	Sound(String fileName) {
		FILE = new File(AUDIO_DIR, fileName);
	}

	// Initialize the backends for all sounds, if they haven't already been
	// initialized yet
	public static void initSounds() {
		if (soundsInitialized)
			return;

		soundsInitialized = true;

		if (REPLIT_API) {
			for (Sound sound : values())
				sound.soundBackend = sound.new ReplitBackend();

			// HACK: Play an audible sound immediately, so the popup message
			// happens now rather than in the middle of a game; SILENT doesn't
			// work here, but the popup will block the first sound anyways so it
			// doesn't matter
			TICK.play();
			return;
		}

		for (Sound sound : values())
			sound.soundBackend = sound.new NativeBackend();

		// HACK: Play a silent sound as soon as possible to eagerly load all the
		// sound stuff now to prevent lag when the first real sound is played
		// (yes this actually helps, I tested it)
		SILENT.play();
	}

	// The actual method that users outside this file will call to play sound
	public void play() {
		// Here is the check for if the option for sound is actually enabled
		if (Main.hasSound())
			soundBackend.play();
	}
}