From 3f289981bd9c8e800a6cd310d4b1f2f36634c9f1 Mon Sep 17 00:00:00 2001
From: tslil <tslil@posteo.de>
Date: Mon, 13 Jul 2026 15:06:41 +0100
Subject: Pure history

---
 src/state.rs | 81 ++++++++++++++++++++++++++++++++++++------------------------
 1 file changed, 49 insertions(+), 32 deletions(-)

(limited to 'src/state.rs')

diff --git a/src/state.rs b/src/state.rs
index b9a6618..a04412f 100644
--- a/src/state.rs
+++ b/src/state.rs
@@ -1,36 +1,36 @@
-use std::{collections::HashSet, fs};
-
-use derive_more::Display;
+use std::{collections::HashSet, fmt, fs};
+use directories::ProjectDirs;
 use expanduser::expanduser;
 use serde::{Deserialize, Serialize};
 use walkdir::WalkDir;
 
-use crate::{
-    config::{Config, default_state_path},
-    learner::Learner,
-    trajectory::Trajectory,
-};
+use crate::{config::Config, learner::Learner, trajectory::Trajectory};
+
+fn default_state_path() -> String {
+    let name = "mood.bin";
+    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 {
-    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);
+    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 {
-            println!("Obtained learning: {learning:?}");
-            self.learner.learn(&self.config, learning);
+            self.learner.learn(learning);
         }
         if let Some((new_album, prob)) = self.learner.sample(
             self.trajectory.slice(),
             &learning.as_ref().into(),
             &self.albums,
-            self.config.temperature,
+            config,
         ) {
             self.trajectory.log(&new_album);
             Some((new_album, prob))
@@ -40,36 +40,39 @@ impl State {
     }
 }
 
-#[derive(Display)]
-#[display("+{added}/-{removed}, total {new_total}")]
 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 load(path: &str) -> Result<State, String> {
-        expanduser(path)
+    pub fn try_load() -> Result<State, String> {
+        expanduser(default_state_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()))
+            .and_then(|p| fs::read(p).map_err(|e| e.to_string()))
+            .and_then(|contents| bincode::deserialize(&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))?;
+        _ = path.parent().map(std::fs::create_dir_all);
+        let serialised =
+            bincode::serialize(self).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
+    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()))
@@ -77,14 +80,14 @@ impl State {
 
         let mut new_albums: HashSet<String> = HashSet::new();
 
-        for root_path in roots {
+        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) {
+                if !Self::contains_audio(&entry, config) {
                     continue;
                 }
 
@@ -113,21 +116,35 @@ impl State {
         }
     }
 
-    fn contains_audio(&self, entry: &walkdir::DirEntry) -> bool {
+    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()))
+                    .is_ok_and(|entry| Self::is_audio_file(&entry.path(), config))
             })
         })
     }
 
-    fn is_audio_file(&self, path: &std::path::Path) -> bool {
+    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| self.config.audio_exts.contains(&format!(".{ext}")))
+                .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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