Preserve elevator stop order and handle viewport resize

packages/core/src/store/use-interactive.ts

@@ -49,6 +49,7 @@ export type ElevatorInteractiveState = {
   phase: ElevatorPhase
   phaseStartedAt: number | null
   queue: AnyNodeId[]
+  requestedStops: AnyNodeId[]
 }
 
 type InteractiveStore = {
@@ -241,6 +242,7 @@ export const useInteractive = create<InteractiveStore>((set, get) => ({
           phase: 'idle',
           phaseStartedAt: null,
           queue: [],
+          requestedStops: [],
         },
       },
     }))

packages/core/src/systems/elevator/elevator-runtime.test.ts

@@ -30,7 +30,9 @@ describe('elevator runtime helpers', () => {
     const duplicated = queueElevatorRequest(queued, upperLevelId)
 
     expect(queued.queue).toEqual([upperLevelId])
+    expect(queued.requestedStops).toEqual([upperLevelId])
     expect(duplicated.queue).toEqual([upperLevelId])
+    expect(duplicated.requestedStops).toEqual([upperLevelId])
   })
 
   test('opens doors only when the elevator is not moving', () => {
@@ -78,5 +80,6 @@ describe('elevator runtime helpers', () => {
     expect(arrived.phase).toBe('opening')
     expect(open.phase).toBe('open')
     expect(open.queue).toEqual([])
+    expect(open.requestedStops).toEqual([upperLevelId])
   })
 })

packages/core/src/systems/elevator/elevator-runtime.ts

@@ -23,6 +23,7 @@ export function createElevatorInteractiveState(
     phase: 'idle',
     phaseStartedAt: null,
     queue: [],
+    requestedStops: [],
   }
 }
 
@@ -64,6 +65,9 @@ export function queueElevatorRequest(
   return {
     ...state,
     queue: [...state.queue, levelId],
+    requestedStops: state.requestedStops.includes(levelId)
+      ? state.requestedStops
+      : [...state.requestedStops, levelId],
   }
 }
 
@@ -124,6 +128,7 @@ export function stepElevatorRuntimeState({
       phase: 'idle',
       phaseStartedAt: null,
       queue: [],
+      requestedStops: [],
       doorOpen: 0,
     }
   }
@@ -147,7 +152,11 @@ export function stepElevatorRuntimeState({
             doorOpen: Math.max(0, state.doorOpen - doorStep),
           }
         }
-        return state
+        if (state.requestedStops.length === 0) return state
+        return {
+          ...state,
+          requestedStops: [],
+        }
       }
 
       return {
@@ -180,6 +189,7 @@ export function stepElevatorRuntimeState({
           targetLevelId: null,
           phase: 'idle',
           queue: [],
+          requestedStops: [],
         }
       }