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/*
* This file is a part of RSPlayer
* Licensed under the GPL-3.0 License
* Copyright (C) 2026 Salmonik @ salmonik@tuta.io
* https://codeberg.org/salmonik/RSPlayer
*/
use crate::config;
use crate::queue::{QueueSnapshot, ShuffleMode, Track};
use serde::{Deserialize, Serialize};
use std::path::{Path, PathBuf};
/// Shape of the on-disk state. A file written by an incompatible version is
/// ignored, so an older or newer daemon never restores a queue it cannot
/// interpret.
const STATE_VERSION: u32 = 1;
/// What the daemon needs to pick up where the previous session left off.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SavedState {
pub version: u32,
pub tracks: Vec<Track>,
pub position: usize,
pub shuffle: ShuffleMode,
pub shuffled_indices: Vec<usize>,
/// Playback was running when this was written, so the next start should
/// continue the current track instead of sitting idle.
pub playing: bool,
}
impl SavedState {
pub fn new(snapshot: QueueSnapshot, playing: bool) -> Self {
Self {
version: STATE_VERSION,
tracks: snapshot.tracks,
position: snapshot.position,
shuffle: snapshot.shuffle,
shuffled_indices: snapshot.shuffled_indices,
playing,
}
}
/// Rebuild a queue snapshot, dropping tracks that are gone from disk.
///
/// Files disappear between sessions (deleted albums, unmounted drives), and
/// a queue full of dead paths would just fail on every play.
pub fn snapshot(&self) -> QueueSnapshot {
if self.tracks.iter().all(|t| t.is_stream || t.path.exists()) {
return QueueSnapshot {
tracks: self.tracks.clone(),
position: self.position,
shuffle: self.shuffle,
shuffled_indices: self.shuffled_indices.clone(),
};
}
let tracks: Vec<Track> = self
.tracks
.iter()
.filter(|t| t.is_stream || t.path.exists())
.cloned()
.collect();
let len = tracks.len();
QueueSnapshot {
tracks,
position: self.position.min(len.saturating_sub(1)),
shuffle: self.shuffle,
// The saved order refers to indices that no longer line up, so let
// the queue derive a fresh one rather than play the wrong tracks.
shuffled_indices: Vec::new(),
}
}
}
pub fn state_path() -> PathBuf {
config::runtime_dir().join("state.json")
}
pub fn load_from(path: &Path) -> Option<SavedState> {
let data = std::fs::read(path).ok()?;
let state: SavedState = serde_json::from_slice(&data).ok()?;
if state.version != STATE_VERSION {
return None;
}
Some(state)
}
/// Write the state atomically: an interrupted write must not leave a truncated
/// file that the next start fails to parse.
pub fn save_to(path: &Path, state: &SavedState) -> std::io::Result<()> {
let tmp = path.with_extension("json.tmp");
let data = serde_json::to_vec(state)
.map_err(|e| std::io::Error::new(std::io::ErrorKind::InvalidData, e))?;
std::fs::write(&tmp, data)?;
std::fs::rename(&tmp, path)
}
#[cfg(test)]
mod tests {
use super::*;
use crate::queue::Queue;
fn temp_path(name: &str) -> PathBuf {
std::env::temp_dir().join(format!("rsp-state-{}-{}.json", std::process::id(), name))
}
/// A real file, because restoring drops queue entries that no longer exist.
fn temp_track(name: &str) -> PathBuf {
let path =
std::env::temp_dir().join(format!("rsp-track-{}-{}.mp3", std::process::id(), name));
std::fs::write(&path, b"not audio").expect("write temp file");
path
}
#[test]
fn saves_and_restores_the_queue_exactly() {
let files: Vec<PathBuf> = (0..3).map(|i| temp_track(&format!("a{i}"))).collect();
let mut queue = Queue::with_seed(7);
for file in &files {
queue.push_track(Track::from_path(file.clone()));
}
queue.set_shuffle(ShuffleMode::All);
queue.set_position(1);
let path = temp_path("roundtrip");
save_to(&path, &SavedState::new(queue.snapshot(), true)).expect("save");
let loaded = load_from(&path).expect("state is readable");
assert!(loaded.playing, "play state survives the round trip");
let restored = Queue::from_snapshot(loaded.snapshot());
assert_eq!(restored.len(), 3);
assert_eq!(restored.position(), 1);
assert_eq!(restored.shuffle_mode(), &ShuffleMode::All);
assert_eq!(restored.shuffled_indices(), queue.shuffled_indices());
assert_eq!(
restored.current().map(|t| t.path.clone()),
queue.current().map(|t| t.path.clone()),
"the current track is where playback left off"
);
std::fs::remove_file(&path).ok();
for file in files {
std::fs::remove_file(file).ok();
}
}
#[test]
fn missing_tracks_are_dropped_on_restore() {
let kept = temp_track("kept");
let mut queue = Queue::new();
queue.push_track(Track::from_path(PathBuf::from("/nonexistent/gone.mp3")));
queue.push_track(Track::from_path(kept.clone()));
queue.set_position(1);
let restored = Queue::from_snapshot(SavedState::new(queue.snapshot(), false).snapshot());
assert_eq!(restored.len(), 1);
assert_eq!(
restored.current().map(|t| t.path.clone()),
Some(kept.clone())
);
std::fs::remove_file(kept).ok();
}
#[test]
fn rebuilds_a_shuffle_order_that_no_longer_fits() {
let files: Vec<PathBuf> = (0..3).map(|i| temp_track(&format!("b{i}"))).collect();
let snapshot = QueueSnapshot {
tracks: files.iter().map(|f| Track::from_path(f.clone())).collect(),
position: 0,
shuffle: ShuffleMode::All,
shuffled_indices: vec![0, 0, 0],
};
let queue = Queue::from_snapshot(snapshot);
let mut order = queue.shuffled_indices().to_vec();
order.sort_unstable();
assert_eq!(order, vec![0, 1, 2], "a valid permutation replaces it");
for file in files {
std::fs::remove_file(file).ok();
}
}
#[test]
fn ignores_states_from_another_version() {
let path = temp_path("version");
std::fs::write(
&path,
br#"{"version":99,"tracks":[],"position":0,"shuffle":"none","shuffled_indices":[],"playing":false}"#,
)
.expect("write state");
assert!(load_from(&path).is_none());
std::fs::remove_file(&path).ok();
}
}
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