fix(store): store is now actually saved and loaded

Cargo.toml

@@ -19,6 +19,7 @@ backend-jellyfin = []
 [dependencies]
 anyhow = "1.0.86"
 clap = { version = "4.5.16", features = ["derive"] }
+directories = "5.0.1"
 eframe = { version = "0.28.1", optional = false }
 egui = { version = "0.28.1", optional = false }
 egui_extras = { version = "0.28.1", features = ["image"] }
@@ -29,6 +30,7 @@ image = { version = "0.25.2", default-features = true, features = [
 ] }
 
 libpt = { version = "0.6.0", features = ["cli", "full"] }
+rmp-serde = "1.3.0"
 serde = { version = "1.0.208", features = ["derive"] }
 strum = { version = "0.26.3", features = ["derive"] }
 thiserror = "1.0.63"

src/error/mod.rs

@@ -1,3 +1,5 @@
+use std::path::PathBuf;
+
 use thiserror::Error;
 
 #[derive(Error, Debug)]
@@ -6,4 +8,21 @@ pub enum Error {
     UiError(#[from] eframe::Error),
     #[error(transparent)]
     Other(#[from] anyhow::Error),
+    #[error(
+        r"The system does not seem to have the usual project dirs, like:
+Linux:      /home/alice/.config/barapp
+MS Windows: C:\Users\Alice\AppData\Roaming\Foo Corp\Bar App\config
+Mac:        /Users/Alice/Library/Application Support/com.Foo-Corp.Bar-App
+
+Closing as to not break your files accidentally."
+    )]
+    NoProjDir,
+    #[error(r"The store file '{0}' where Beatbär stores it's metadata is not a regular file, refusing to save or load to keep your files safe.")]
+    BadStoreFile(PathBuf),
+    #[error(r"Could not convert the store to the binary format for saving it to the disk.")]
+    RmpEncode(#[from] rmp_serde::encode::Error),
+    #[error(r"Could not decode the store from the binary format for loading it from the disk. Is your store file broken?")]
+    RmpDecode(#[from] rmp_serde::decode::Error),
+    #[error(r"Error while reading or writing to the disk. Source: {0}")]
+    IO(#[from] std::io::Error),
 }

src/player/mod.rs

@@ -1,5 +1,6 @@
 use clap::Parser;
 use eframe::CreationContext;
+use egui::Stroke;
 use libpt::cli::args::VerbosityLevel;
 use libpt::log::{debug, info};
 
@@ -27,10 +28,15 @@ pub struct Player {
     kind: Kind,
 
     #[clap(skip)]
-    store: Store,
+    store: Option<Store>,
 }
 
 impl Player {
+    #[inline]
+    pub fn store(&self) -> &Store {
+        &self.store.as_ref().unwrap()
+    }
+
     pub fn build() -> Result<Self, Error> {
         let mut app = Player::parse();
 
@@ -63,7 +69,7 @@ impl Player {
         Ok(app)
     }
     pub fn init(&mut self, _cc: &CreationContext) {
-        // we can use the creation context to do some customizing, but idc right now
+        self.store = Some(Store::load().expect("could not load store"));
     }
 
     fn set_category(&mut self, kind: Kind) {
@@ -80,11 +86,15 @@ impl Player {
 
     fn entries(&self) -> Vec<Entry> {
         match self.category() {
-            Kind::Album => self.store.albums(),
-            Kind::Song => self.store.songs(),
-            Kind::Playlist => self.store.playlists(),
-            Kind::Artist => self.store.artists(),
-            Kind::Genre => self.store.genres(),
+            Kind::Album => self.store().albums(),
+            Kind::Song => self.store().songs(),
+            Kind::Playlist => self.store().playlists(),
+            Kind::Artist => self.store().artists(),
+            Kind::Genre => self.store().genres(),
         }
     }
+
+    pub fn end(&mut self) -> Result<(), Error> {
+        self.store().save()
+    }
 }

src/player/ui/mod.rs

@@ -1,6 +1,6 @@
 use egui::{IconData, Sense};
 use egui_extras::{Column, TableBuilder};
-use libpt::log::{trace, warn};
+use libpt::log::{error, trace, warn};
 use strum::IntoEnumIterator;
 
 pub mod entry;
@@ -174,4 +174,12 @@ impl eframe::App for Player {
         });
         egui::TopBottomPanel::bottom("bot_panel").show(ctx, Self::bottom_label);
     }
+    fn on_exit(&mut self, _gl: Option<&eframe::glow::Context>) {
+        match self.store().save() {
+            Ok(_) => (),
+            Err(e) => {
+                error!("{e}");
+            }
+        }
+    }
 }

src/store/mod.rs

@@ -1,24 +1,104 @@
-#[derive(Default)]
-pub struct Store {}
+use std::fs::File;
+use std::io::{BufReader, Write};
+use std::path::PathBuf;
+
+use libpt::log::{debug, error, info, warn};
+use serde::{Deserialize, Serialize};
+
+use crate::error::Error;
+
+#[derive(Serialize, Deserialize, Default, Debug)]
+pub struct Store {
+    dummy: String,
+}
 
 impl Store {
+    pub fn projdir() -> Option<directories::ProjectDirs> {
+        directories::ProjectDirs::from("de.cscherr", "Beatbär", "Beatbär")
+    }
+
     pub fn genres(&self) -> Vec<crate::player::ui::entry::Entry> {
-        todo!()
+        vec![]
     }
 
     pub fn artists(&self) -> Vec<crate::player::ui::entry::Entry> {
-        todo!()
+        vec![]
     }
 
     pub fn playlists(&self) -> Vec<crate::player::ui::entry::Entry> {
-        todo!()
+        vec![]
     }
 
     pub fn songs(&self) -> Vec<crate::player::ui::entry::Entry> {
-        todo!()
+        vec![]
     }
 
     pub fn albums(&self) -> Vec<crate::player::ui::entry::Entry> {
-        todo!()
+        vec![]
+    }
+
+    pub fn save(&self) -> Result<(), Error> {
+        info!("saving the store to file");
+        debug!("Store: {self:#?}");
+        if let Some(dirs) = Self::projdir() {
+            let mut store_path: PathBuf = dirs.data_local_dir().into();
+            store_path.push("store.msgpack");
+
+            if !store_path.exists() {
+                std::fs::create_dir_all(
+                    store_path
+                        .parent()
+                        .expect("beatbär storefile has no parent????"),
+                )?;
+                warn!("The Beatbär store at '{}' does not exist. Creating it anew. This is normal if you start Beatbär for the first time.", store_path.as_path().to_string_lossy());
+            } else if !store_path.is_file() {
+                let e = Error::BadStoreFile(store_path);
+                error!("{e}");
+                return Err(e);
+            }
+
+            let mut file = File::options()
+                .write(true)
+                .append(false)
+                .create(true)
+                .truncate(true)
+                .open(store_path)?;
+            let repr = rmp_serde::to_vec(self)?;
+            file.write_all(&repr)?;
+            info!("store file was written");
+            Ok(())
+        } else {
+            Err(Error::NoProjDir)
+        }
+    }
+
+    pub fn load() -> Result<Self, Error> {
+        info!("loading the store to file");
+        if let Some(dirs) = Self::projdir() {
+            let mut store_path: PathBuf = dirs.data_local_dir().into();
+            store_path.push("store.msgpack");
+
+            if !store_path.exists() {
+                warn!(
+                    "The Beatbär store at '{}' does not exist. Loading an empty store instead.",
+                    store_path.as_path().to_string_lossy()
+                );
+                return Ok(Self::default());
+            } else if !store_path.is_file() {
+                let e = Error::BadStoreFile(store_path);
+                error!("{e}");
+                return Err(e);
+            }
+
+            let file = File::options().read(true).write(false).open(store_path)?;
+            let store = rmp_serde::from_read(file)?;
+            info!("store file was loaded");
+            debug!("Store: {store:#?}");
+            Ok(store)
+        } else {
+            let e = Error::NoProjDir;
+            error!("{}", e);
+            std::process::exit(1);
+        }
     }
 }