fix: Fix new game reset bug (#60)

src/features/pom/components.rs

@@ -5,7 +5,7 @@ use std::collections::VecDeque;
 #[derive(Component)]
 pub struct Pom;
 
-#[derive(Component, Serialize, Deserialize, Clone, Copy)]
+#[derive(Component, Serialize, Deserialize, Clone, Copy, Default)]
 pub struct GridPosition {
     pub x: u32,
     pub y: u32,

src/features/savegame/mod.rs

@@ -19,6 +19,7 @@ impl Plugin for SavegamePlugin {
 
         app.add_systems(Update, dump_savegame.run_if(in_state(AppState::GameScreen)));
         app.add_systems(Update, load_savegame.run_if(in_state(AppState::GameScreen)));
+        app.add_systems(OnExit(AppState::GameScreen), reset_savegame);
 
         app.add_systems(Update, load_popup_handler);
     }
@@ -172,3 +173,36 @@ fn load_savegame(
         }
     }
 }
+
+// Resets all components/resources loaded by `load_savegame`
+fn reset_savegame(
+    mut commands: Commands,
+    grid: Res<Grid>,
+    mut tile_query: Query<&mut TileState>,
+    mut phase: ResMut<CurrentPhase>,
+    mut tracker: ResMut<SessionTracker>,
+    mut settings: ResMut<TimerSettings>,
+    mut pom_query: Query<(&mut GridPosition, &mut Transform), With<Pom>>,
+    mut inventory: ResMut<Inventory>,
+) {
+    *tracker = SessionTracker::default();
+    *settings = TimerSettings::default();
+    *phase = CurrentPhase(Phase::Focus {
+        duration: settings.focus_duration as f32,
+    });
+
+    inventory
+        .items
+        .iter()
+        .for_each(|entity| commands.entity(*entity).despawn());
+    inventory.items.clear();
+
+    if let Ok((mut pom_pos, mut pom_transform)) = pom_query.single_mut() {
+        *pom_pos = GridPosition::default();
+        pom_transform.translation = grid_to_world_coords(0, 0, Some(1.0), grid.width, grid.height);
+    }
+
+    tile_query
+        .iter_mut()
+        .for_each(|mut state| *state = TileState::default());
+}