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use std::{collections::HashSet, fs};
use derive_more::Display;
use expanduser::expanduser;
use serde::{Deserialize, Serialize};
use walkdir::WalkDir;
use crate::{
config::{Config, default_state_path},
learner::Learner,
trajectory::Trajectory,
};
#[derive(Serialize, Deserialize, Default)]
pub struct State {
pub config: Config,
trajectory: Trajectory,
learner: Learner,
albums: HashSet<String>,
}
impl State {
pub fn next(&mut self) -> Option<(String, f32)> {
let learning = self.trajectory.step(self.config.skip_window_secs);
if let Some(ref learning) = learning {
println!("Obtained learning: {learning:?}");
self.learner.learn(&self.config, learning);
}
if let Some((new_album, prob)) = self.learner.sample(
self.trajectory.slice(),
&learning.as_ref().into(),
&self.albums,
self.config.temperature,
) {
self.trajectory.log(&new_album);
Some((new_album, prob))
} else {
None
}
}
}
#[derive(Display)]
#[display("+{added}/-{removed}, total {new_total}")]
pub struct UpdateResult {
added: usize,
removed: usize,
new_total: usize,
}
impl State {
pub fn load(path: &str) -> Result<State, String> {
expanduser(path)
.map_err(|e| e.to_string())
.and_then(|p| fs::read_to_string(p).map_err(|e| e.to_string()))
.and_then(|contents| ron::from_str(&contents).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(|parent| std::fs::create_dir_all(parent));
let serialised = ron::ser::to_string_pretty(self, ron::ser::PrettyConfig::default())
.map_err(|e| format!("Failed to serialize state: {}", e))?;
fs::write(&path, serialised)
.map_err(|e| format!("Failed to write state file at {}: {}", str_path, e))?;
Ok(())
}
pub fn update_albums(&mut self) -> UpdateResult {
let roots: Vec<_> = self
.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) {
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(&self, entry: &walkdir::DirEntry) -> 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()))
})
})
}
fn is_audio_file(&self, path: &std::path::Path) -> bool {
!path.is_dir()
&& path
.extension()
.and_then(|ext| ext.to_str())
.map(|s| s.to_lowercase())
.is_some_and(|ext| self.config.audio_exts.contains(&format!(".{ext}")))
}
}
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