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use rodio::{Decoder, OutputStream, OutputStreamHandle, Sink, Source};
use std::fs::File;
use std::io::BufReader;
use std::path::PathBuf;
use std::sync::{Arc, Mutex};
use std::thread;
use crate::state::TimerPhase;
// OutputStream is !Send, so we keep it alive in a dedicated thread.
// Only OutputStreamHandle and Sink (both Send) cross thread boundaries.
#[derive(Debug, Clone, Copy, PartialEq)]
pub enum AmbientSound {
Rain,
Cafe,
WhiteNoise,
}
impl AmbientSound {
pub fn filename(&self) -> &'static str {
match self {
AmbientSound::Rain => "rain.ogg",
AmbientSound::Cafe => "cafe.ogg",
AmbientSound::WhiteNoise => "white_noise.ogg",
}
}
pub fn name(&self) -> &'static str {
match self {
AmbientSound::Rain => "rain",
AmbientSound::Cafe => "cafe",
AmbientSound::WhiteNoise => "white_noise",
}
}
pub fn from_str(s: &str) -> Option<Self> {
match s {
"rain" => Some(AmbientSound::Rain),
"cafe" => Some(AmbientSound::Cafe),
"white_noise" => Some(AmbientSound::WhiteNoise),
_ => None,
}
}
}
pub struct AudioEngine {
stream_handle: OutputStreamHandle,
sink: Option<Sink>,
current_sound: Option<AmbientSound>,
volume: f32,
ducked: bool,
duck_volume: f32,
audio_dir: PathBuf,
}
impl AudioEngine {
fn new_with_handle(stream_handle: OutputStreamHandle, audio_dir: PathBuf) -> Self {
Self {
stream_handle,
sink: None,
current_sound: None,
volume: 0.5,
ducked: false,
duck_volume: 0.2,
audio_dir,
}
}
pub fn play(&mut self, sound: AmbientSound) -> Result<(), String> {
self.stop();
let filename = sound.filename();
let path = self.audio_dir.join(filename);
let file = File::open(&path).map_err(|e| format!("Cannot open {filename}: {e}"))?;
let source = Decoder::new(BufReader::new(file))
.map_err(|e| format!("Decode error: {e}"))?;
let sink = Sink::try_new(&self.stream_handle)
.map_err(|e| format!("Sink error: {e}"))?;
sink.append(source.repeat_infinite());
sink.set_volume(if self.ducked { self.duck_volume } else { self.volume });
sink.play();
self.current_sound = Some(sound);
self.sink = Some(sink);
Ok(())
}
pub fn stop(&mut self) {
if let Some(sink) = self.sink.take() {
sink.stop();
}
self.current_sound = None;
}
pub fn set_volume(&mut self, volume: f32) {
self.volume = volume.clamp(0.0, 1.0);
if let Some(ref sink) = self.sink {
if !self.ducked {
sink.set_volume(self.volume);
}
}
}
pub fn duck(&mut self) {
self.ducked = true;
if let Some(ref sink) = self.sink {
sink.set_volume(self.duck_volume);
}
}
pub fn unduck(&mut self) {
self.ducked = false;
if let Some(ref sink) = self.sink {
sink.set_volume(self.volume);
}
}
pub fn is_playing(&self) -> bool {
self.sink.is_some()
}
pub fn current_sound(&self) -> Option<AmbientSound> {
self.current_sound
}
pub fn volume(&self) -> f32 {
self.volume
}
}
pub fn should_duck_for_phase(phase: TimerPhase) -> bool {
!matches!(phase, TimerPhase::Work)
}
/// Managed state: Arc<Mutex<Option<AudioEngine>>>.
/// None means audio init failed (graceful degradation).
pub struct AudioState(pub Arc<Mutex<Option<AudioEngine>>>);
/// Initialise the audio subsystem.
///
/// Spawns a dedicated thread to keep `OutputStream` alive (it is `!Send`).
/// Returns `AudioState` whose inner `Option` is `None` if no audio device exists.
pub fn init_audio(audio_dir: PathBuf) -> AudioState {
let state: Arc<Mutex<Option<AudioEngine>>> = Arc::new(Mutex::new(None));
let state_clone = Arc::clone(&state);
thread::spawn(move || {
match OutputStream::try_default() {
Ok((_stream, handle)) => {
let engine = AudioEngine::new_with_handle(handle, audio_dir);
{
let mut guard = state_clone.lock().unwrap();
*guard = Some(engine);
}
// Park forever — _stream must stay alive to keep audio device open.
loop {
thread::park();
}
}
Err(e) => {
eprintln!("[audio] No audio output device: {e}");
// state remains None
}
}
});
// Give the audio thread a moment to initialise before returning.
// Commands will work fine regardless due to Option<AudioEngine> guard.
thread::sleep(std::time::Duration::from_millis(100));
AudioState(state)
}
#[cfg(test)]
mod tests {
use super::should_duck_for_phase;
use crate::state::TimerPhase;
#[test]
fn work_phase_does_not_duck() {
assert!(!should_duck_for_phase(TimerPhase::Work));
}
#[test]
fn break_phases_duck() {
assert!(should_duck_for_phase(TimerPhase::ShortBreak));
assert!(should_duck_for_phase(TimerPhase::LongBreak));
}
}
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