feat: Add inventory savegame loading (#48)

src/features/savegame/mod.rs

@@ -28,6 +28,7 @@ struct SaveData {
     session_tracker: SessionTracker,
     timer_settings: TimerSettings,
     pom_position: GridPosition,
+    inventory: Vec<ItemStack>,
 }
 
 fn dump_savegame(
@@ -39,6 +40,8 @@ fn dump_savegame(
     tracker: Res<SessionTracker>,
     settings: Res<TimerSettings>,
     pom_query: Query<&GridPosition, With<Pom>>,
+    inventory: Res<Inventory>,
+    item_query: Query<&ItemStack>,
 ) {
     for _ in messages.read() {
         let mut tile_states = Vec::new();
@@ -61,6 +64,12 @@ fn dump_savegame(
 
         let pom_pos = pom_query.single().unwrap();
 
+        let item_stacks: Vec<ItemStack> = inventory
+            .items
+            .iter()
+            .filter_map(|entity| item_query.get(*entity).ok().cloned())
+            .collect();
+
         let save_data = SaveData {
             grid_width: grid.width,
             grid_height: grid.height,
@@ -69,6 +78,7 @@ fn dump_savegame(
             session_tracker: tracker.clone(),
             timer_settings: settings.clone(),
             pom_position: *pom_pos,
+            inventory: item_stacks,
         };
 
         match serde_json::to_string_pretty(&save_data) {
@@ -91,6 +101,7 @@ fn dump_savegame(
 }
 
 fn load_savegame(
+    mut commands: Commands,
     mut messages: MessageReader<SavegameLoadMessage>,
     save_path: Res<SavegamePath>,
     grid: Res<Grid>,
@@ -99,6 +110,7 @@ fn load_savegame(
     mut tracker: ResMut<SessionTracker>,
     mut settings: ResMut<TimerSettings>,
     mut pom_query: Query<(&mut GridPosition, &mut Transform), With<Pom>>,
+    mut inventory: ResMut<Inventory>,
 ) {
     for _ in messages.read() {
         if let Ok(mut file) = File::open(&save_path.0) {
@@ -136,6 +148,14 @@ fn load_savegame(
                             }
                         }
                     }
+
+                    let stack_entities: Vec<Entity> = save_data
+                        .inventory
+                        .iter()
+                        .map(|stack| commands.spawn(stack.clone()).id())
+                        .collect();
+                    inventory.items = stack_entities;
+
                     println!("Game loaded from {}", save_path.0.display());
                 }
                 Err(e) => {