feat: Add focus minute berry reward (#63)

src/features/phase/mod.rs

@@ -70,13 +70,35 @@ fn tick_timer(
     mut phase_res: ResMut<CurrentPhase>,
     mut finish_writer: MessageWriter<PhaseTimerFinishedMessage>,
     mut savegame_messages: MessageWriter<SavegameDumpMessage>,
+    config: Res<GameConfig>,
+    mut inventory: ResMut<Inventory>,
+    mut commands: Commands,
+    mut items_query: Query<&mut ItemStack>,
+    mut session_tracker: ResMut<SessionTracker>,
 ) {
     let delta = time.delta_secs();
     let phase = &mut phase_res.0;
 
     match phase {
         Phase::Focus { duration } | Phase::Break { duration } => {
+            let old_minutes = (*duration / 60.0).floor() as i32;
             *duration -= delta;
+            let new_minutes = (*duration / 60.0).floor() as i32;
+
+            if new_minutes < old_minutes {
+                println!(
+                    "A minute of focus has been completed. Granting {} berries as a reward.",
+                    config.berries_per_focus_minute
+                );
+
+                inventory.update_item_stack(
+                    &mut commands,
+                    &mut items_query,
+                    ItemType::Berry,
+                    config.berries_per_focus_minute as i32,
+                );
+                session_tracker.total_berries_earned += config.berries_per_focus_minute;
+            }
 
             if *duration <= 0.0 {
                 finish_writer.write(PhaseTimerFinishedMessage {