backend/src/api/handler.rs

@@ -23,7 +23,7 @@ pub enum ApiMessage {
     OnChargeChange(f64), // battery fill amount: 0 = empty, 1 = full
     PowerVibeCheck,
     WaitForEmptyQueue(Callback<()>),
-    LoadSettings(Option<(u64, String)>, u64, String, u64, String), // ((legacy game_id, legacy name), path, name, variant, variant name)
+    LoadSettings(Option<(u64, String)>, Option<(u64, String, u64, String)>), // (legacy(game_id, name), current(path, name, variant, variant name))
     LoadVariant(u64, String), // (variant, variant name) -- path and name assumed to be for current profile
     LoadMainSettings,
     LoadSystemSettings,
@@ -504,7 +504,7 @@ impl ApiMessageHandler {
                 self.on_empty.push(callback);
                 false
             }
-            ApiMessage::LoadSettings(legacy_settings, id, name, variant_id, variant_name) => {
+            ApiMessage::LoadSettings(legacy_settings, current_settings) => {
                 /* Migration steps:
                 1. Modify to the frontend to send the game ID in this message (`id` here is the app
                    ID).
@@ -515,19 +515,44 @@ impl ApiMessageHandler {
                 4. Let the rest of the code below work its magic.
                 */
 
-                // If `legacy_settings` is `Some`, there is a legacy savefile present.
-                if let Some((legacy_game_id, legacy_name)) = legacy_settings {
-                    // Create path to the legacy settings file.
-                    let legacy_file_path = format!("{}.json", legacy_game_id);
+                // ===== migration logic =====
+                if legacy_settings.is_some() {
+                    let (legacy_game_id, legacy_name) = legacy_settings.unwrap();
 
-                    // Load the file from disk and deserialize it.
-                    let file = crate::persist::OldSettingsJson::open(legacy_file_path);
+                    let legacy_file_path = format!("{legacy_game_id}.json");
+                    let legacy_file = crate::persist::OldSettingsJson::open(legacy_file_path)
+                        .expect("should be able to deserialzie legacy savefile format"); // TODO: don't panic on fail.
 
-                    // If a file in the modern format exists, add it as a new variant to
-                    // `FileJson` using `FileJson::merge_legacy_settings()`. Else, create a new
-                    // FileJson with this as the only variant, using
-                    // `FileJson::from<OldSettingsJson>()`.
+                    if current_settings.is_some() {
+                        // A savefile in both the legacy and current format exist.
+                        let (id, name, variant_id, variant_name) = current_settings.unwrap();
+                        let path = format!("{}.ron", id);
+
+                        // 1. Parse `legacy_file` to into a settings variant.
+                        let migrated_settings_variant: crate::persist::SettingsJson =
+                            legacy_file.into();
+                        // 2. Insert the variant into the current settings file.
+                        match settings.load_file(
+                            path.into(),
+                            id,
+                            name,
+                            variant_id,
+                            variant_name,
+                            false,
+                        ) {
+                            Ok(success) => log::info!("Loaded settings file? {}", success),
+                            Err(e) => log::warn!("Load file err: {}", e),
+                        }
+                        settings.add_variant() //TODO: This.
+                    } else {
+                        // A savefile in the current format doesn't exist yet.
+                        // TODO: Parse it to the new format and save it.
+                        let migrated_settings: crate::persist::FileJson = legacy_file.into();
+                    }
+                } else if current_settings.is_some() {
+                    // ...
                 }
+                // ===========================
 
                 let path = format!("{}.ron", id);
                 if let Err(e) = settings.on_unload() {