bf

src/patient.rs

@@ -100,19 +100,18 @@ impl Patient {
     pub fn update(&mut self, dt_seconds: f32) {
         for organ in &mut self.organs { organ.update(dt_seconds); }
         // Simple inter-organ signaling: low SpO2 nudges heart rate higher.
-        if let Some(lungs) = self.find_organ_typed::<Lungs>() {
+        if let Some(spo2) = self.find_organ_typed::<Lungs>().map(|l| l.spo2_pct) {
             if let Some(heart) = self.find_organ_typed_mut::<Heart>() {
-                let target = if lungs.spo2_pct < 92.0 { 90.0 } else { 70.0 };
+                let target = if spo2 < 92.0 { 90.0 } else { 70.0 };
                 let diff = target - heart.heart_rate_bpm;
                 heart.heart_rate_bpm += 0.05 * diff;
             }
         }
         // Kidneys produce urine into bladder
-        if let (Some(kidneys), Some(bladder)) = (
-            self.find_organ_typed::<crate::organs::Kidneys>(),
-            self.find_organ_typed_mut::<crate::organs::Bladder>(),
-        ) {
-            let produced = (kidneys.gfr * (dt_seconds / 60.0)).max(0.0) * 0.5; // ml
+        let produced_opt = self
+            .find_organ_typed::<crate::organs::Kidneys>()
+            .map(|kidneys| (kidneys.gfr * (dt_seconds / 60.0)).max(0.0) * 0.5); // ml
+        if let (Some(produced), Some(bladder)) = (produced_opt, self.find_organ_typed_mut::<crate::organs::Bladder>()) {
             bladder.volume_ml += produced;
         }
     }