extract timing from AppSizeHandler to TimedSerializer

Signed-off-by: kernelkind <kernelkind@gmail.com>

crates/notedeck_chrome/Cargo.toml

@@ -19,6 +19,7 @@ notedeck = { workspace = true }
 puffin = { workspace = true, optional = true }
 puffin_egui = { workspace = true, optional = true }
 serde_json = { workspace = true }
+serde = { workspace = true }
 strum = { workspace = true }
 tokio = { workspace = true }
 tracing-appender = { workspace = true }

crates/notedeck_chrome/src/timed_serializer.rs

@@ -0,0 +1,86 @@
+use std::time::{Duration, Instant};
+
+use notedeck::{storage, DataPath, DataPathType, Directory};
+use serde::{Deserialize, Serialize};
+use tracing::info;
+
+pub struct TimedSerializer<T: PartialEq + Copy + Serialize + for<'de> Deserialize<'de>> {
+    directory: Directory,
+    file_name: String,
+    delay: Duration,
+    last_saved: Instant,
+    saved_item: Option<T>,
+}
+
+impl<T: PartialEq + Copy + Serialize + for<'de> Deserialize<'de>> TimedSerializer<T> {
+    pub fn new(path: &DataPath, path_type: DataPathType, file_name: String) -> Self {
+        let directory = Directory::new(path.path(path_type));
+        let delay = Duration::from_millis(1000);
+
+        Self {
+            directory,
+            file_name,
+            delay,
+            last_saved: Instant::now() - delay,
+            saved_item: None,
+        }
+    }
+
+    pub fn with_delay(mut self, delay: Duration) -> Self {
+        self.delay = delay;
+        self
+    }
+
+    fn should_save(&self) -> bool {
+        self.last_saved.elapsed() >= self.delay
+    }
+
+    // returns whether successful
+    pub fn try_save(&mut self, cur_item: T) -> bool {
+        if self.should_save() {
+            if let Some(saved_item) = self.saved_item {
+                if saved_item != cur_item {
+                    return self.save(cur_item);
+                }
+            } else {
+                return self.save(cur_item);
+            }
+        }
+        false
+    }
+
+    pub fn get_item(&self) -> Option<T> {
+        if self.saved_item.is_some() {
+            return self.saved_item;
+        }
+
+        if let Ok(file_contents) = self.directory.get_file(self.file_name.clone()) {
+            if let Ok(item) = serde_json::from_str::<T>(&file_contents) {
+                return Some(item);
+            }
+        } else {
+            info!("Could not find file {}", self.file_name);
+        }
+
+        None
+    }
+
+    fn save(&mut self, cur_item: T) -> bool {
+        if let Ok(serialized_item) = serde_json::to_string(&cur_item) {
+            if storage::write_file(
+                &self.directory.file_path,
+                self.file_name.clone(),
+                &serialized_item,
+            )
+            .is_ok()
+            {
+                info!("wrote item {}", serialized_item);
+                self.last_saved = Instant::now();
+                self.saved_item = Some(cur_item);
+                return true;
+            }
+        }
+
+        false
+    }
+}