Chore: Refactor Rust-Backend Modularity

src-tauri/src/commands/backup.rs

@@ -0,0 +1,75 @@
+use std::path::PathBuf;
+use tauri::Manager;
+
+fn backup_dir(app: &tauri::AppHandle) -> PathBuf {
+    app.path().app_data_dir()
+        .unwrap_or_else(|_| PathBuf::from("."))
+        .join("backups")
+}
+
+fn unix_now() -> u64 {
+    std::time::SystemTime::now()
+        .duration_since(std::time::UNIX_EPOCH)
+        .unwrap_or_default()
+        .as_secs()
+}
+
+#[tauri::command]
+pub async fn export_app_data(app: tauri::AppHandle, json: String) -> Result<String, String> {
+    use tauri_plugin_dialog::DialogExt;
+
+    let filename = format!("moku-backup-{}.json", unix_now());
+
+    let path = app.dialog()
+        .file()
+        .set_title("Save Moku app data backup")
+        .set_file_name(&filename)
+        .blocking_save_file()
+        .ok_or("Cancelled")?;
+
+    let dest = PathBuf::from(path.to_string());
+    std::fs::write(&dest, json.as_bytes()).map_err(|e| e.to_string())?;
+
+    Ok(dest.to_string_lossy().into_owned())
+}
+
+#[tauri::command]
+pub async fn import_app_data(app: tauri::AppHandle) -> Result<String, String> {
+    use tauri_plugin_dialog::DialogExt;
+
+    let path = app.dialog()
+        .file()
+        .set_title("Open Moku app data backup")
+        .blocking_pick_file()
+        .ok_or("Cancelled")?;
+
+    std::fs::read_to_string(PathBuf::from(path.to_string())).map_err(|e| e.to_string())
+}
+
+#[tauri::command]
+pub fn auto_backup_app_data(app: tauri::AppHandle, json: String) -> Result<(), String> {
+    let dir = backup_dir(&app);
+    std::fs::create_dir_all(&dir).map_err(|e| e.to_string())?;
+
+    let dest = dir.join(format!("auto-moku-backup-{}.json", unix_now()));
+    std::fs::write(&dest, json.as_bytes()).map_err(|e| e.to_string())?;
+
+    let mut entries: Vec<_> = std::fs::read_dir(&dir)
+        .map_err(|e| e.to_string())?
+        .filter_map(|e| e.ok())
+        .filter(|e| e.file_name().to_string_lossy().starts_with("auto-moku-backup-"))
+        .collect();
+
+    entries.sort_by_key(|e| e.file_name());
+
+    for old in entries.iter().take(entries.len().saturating_sub(5)) {
+        let _ = std::fs::remove_file(old.path());
+    }
+
+    Ok(())
+}
+
+#[tauri::command]
+pub fn get_auto_backup_dir(app: tauri::AppHandle) -> String {
+    backup_dir(&app).to_string_lossy().into_owned()
+}