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use std::{collections::HashSet, fmt, fs};
use directories::ProjectDirs;
use expanduser::expanduser;
use serde::{Deserialize, Serialize};
use walkdir::WalkDir;
use zstd;
use crate::{config::Config, learner::Learner, trajectory::Trajectory};
fn default_state_path() -> String {
let name = "mood.bin.zstd";
ProjectDirs::from("qualifier", "organisation", "mood")
.and_then(|pd| pd.config_dir().join(name).to_str().map(|x| x.to_string()))
.unwrap_or(format!("~/.config/mood/{name}"))
}
#[derive(Serialize, Deserialize, Default)]
pub struct State {
trajectory: Trajectory,
learner: Learner,
albums: HashSet<String>,
}
impl State {
pub fn next(&mut self, config: &Config) -> Option<(String, f32)> {
let learning = self.trajectory.step(config.skip_window_secs);
if let Some(ref learning) = learning {
self.learner.learn(learning);
}
if let Some((new_album, prob)) = self.learner.sample(
self.trajectory.slice(),
&learning.as_ref().into(),
&self.albums,
config,
) {
self.trajectory.log(&new_album);
Some((new_album, prob))
} else {
None
}
}
}
pub struct UpdateResult {
added: usize,
removed: usize,
new_total: usize,
}
impl fmt::Display for UpdateResult {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "+{}/-{}, total {}", self.added, self.removed, self.new_total)
}
}
impl State {
pub fn try_load() -> Result<State, String> {
expanduser(default_state_path())
.map_err(|e| e.to_string())
.and_then(|p| fs::read(p).map_err(|e| e.to_string()))
.and_then(|contents| zstd::decode_all(&contents[..]).map_err(|e| e.to_string()))
.and_then(|decompressed| bincode::deserialize(&decompressed).map_err(|e| e.to_string()))
}
pub fn try_save(&self) -> Result<(), String> {
let str_path = default_state_path();
let path = expanduser(&str_path).map_err(|e| e.to_string())?;
_ = path.parent().map(std::fs::create_dir_all);
let serialised =
bincode::serialize(self).map_err(|e| format!("Failed to serialize state: {}", e))?;
let compressed = zstd::encode_all(serialised.as_slice(), 3)
.map_err(|e| format!("Failed to compress state: {}", e))?;
fs::write(&path, compressed)
.map_err(|e| format!("Failed to write state file at {}: {}", str_path, e))?;
Ok(())
}
pub fn update_albums(&mut self, config: &Config) -> UpdateResult {
let roots: Vec<_> = config
.music_roots
.iter()
.filter_map(|x| expanduser(x).ok().filter(|p| p.is_dir()))
.collect();
let mut new_albums: HashSet<String> = HashSet::new();
for root_path in &roots {
for entry in WalkDir::new(&root_path) {
let entry = match entry {
Ok(e) if e.path().is_dir() => e,
_ => continue,
};
if !Self::contains_audio(&entry, config) {
continue;
}
if let Some(rel_str) = entry
.path()
.strip_prefix(&root_path)
.ok()
.and_then(|p| p.to_str())
{
new_albums.insert(rel_str.to_string());
}
}
}
let added = new_albums.difference(&self.albums).count();
let removed = self.albums.difference(&new_albums).count();
self.albums.clone_from(&new_albums);
self.trajectory.prune(&self.albums);
self.learner.prune(&self.albums);
UpdateResult {
added,
removed,
new_total: self.albums.len(),
}
}
fn contains_audio(entry: &walkdir::DirEntry, config: &Config) -> bool {
fs::read_dir(entry.path()).ok().is_some_and(|mut entries| {
entries.any(|e| {
e.as_ref()
.is_ok_and(|entry| Self::is_audio_file(&entry.path(), config))
})
})
}
fn is_audio_file(path: &std::path::Path, config: &Config) -> bool {
!path.is_dir()
&& path
.extension()
.and_then(|ext| ext.to_str())
.map(|s| s.to_lowercase())
.is_some_and(|ext| config.audio_exts.contains(&format!(".{ext}")))
}
}
impl State {
pub fn dump_albums(&self) -> Result<String, String> {
serde_json::to_string_pretty(&self.albums).map_err(|e| e.to_string())
}
pub fn dump_learner(&self) -> Result<String, String> {
serde_json::to_string_pretty(&self.learner).map_err(|e| e.to_string())
}
pub fn dump_trajectory(&self) -> Result<String, String> {
serde_json::to_string_pretty(&self.trajectory).map_err(|e| e.to_string())
}
}
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