Enable flashlight at sunset and switch primary night action

src/constants/flashlight.ts

@@ -8,5 +8,6 @@ export const FLASHLIGHT = {
   halfAngle: 28 * Math.PI / 180,
   penumbra: 0.6,
   color: '#fff2dc',
-  nightAltitude: 0,
+  // Apparent solar centre below the horizon by roughly one solar radius.
+  nightAltitude: -0.3,
 } as const;

src/controls/flashlight.ts

@@ -0,0 +1,7 @@
+import { FLASHLIGHT } from '../constants/flashlight.ts';
+
+/** Auto-enable only on night entry; preserve manual choices during the night. */
+export function flashlightAfterSunUpdate(on: boolean, previousAltitude: number | undefined, altitude: number) {
+  if (altitude > FLASHLIGHT.nightAltitude) return false;
+  return previousAltitude === undefined || previousAltitude > FLASHLIGHT.nightAltitude ? true : on;
+}

src/scene/world.ts

@@ -52,6 +52,7 @@ import type { PlayerState, PlayerUpdate } from '../multiplayer/protocol.ts';
 import { createSelfBadge } from '../ui/selfBadge.ts';
 import { createFlashlight } from './flashlight.ts';
 import { FLASHLIGHT } from '../constants/flashlight.ts';
+import { flashlightAfterSunUpdate } from '../controls/flashlight.ts';
 
 export function createWorld(canvas: HTMLCanvasElement, terrainData: Awaited<ReturnType<typeof loadTerrain>>, buildingData: BuildingAssets | null,
   onMove: (location: { latitude: number; longitude: number; elevation: number }) => void, coast?: LoadedCoast, structureAssets?: StructureAssets, reconstructSummit = false, summitGeometry?: BufferGeometry,
@@ -182,6 +183,8 @@ export function createWorld(canvas: HTMLCanvasElement, terrainData: Awaited<Retu
   const emotes = createEmoteState();
   const emoteEvents = new AbortController();
   const waveButton = document.querySelector<HTMLButtonElement>('#emote-wave')!;
+  const primaryActionLabel = document.getElementById('primary-action-label')!;
+  const primaryActionIcon = waveButton.querySelector('use')!;
   const prayButton = document.querySelector<HTMLButtonElement>('#emote-pray')!;
   const emoteStatus = document.getElementById('emote-status')!;
   const rainGear = createRainGearState();
@@ -233,19 +236,26 @@ export function createWorld(canvas: HTMLCanvasElement, terrainData: Awaited<Retu
     if (!sheep || overview || networkBlocked || !solarState || solarState.altitude > FLASHLIGHT.nightAltitude) return;
     flashlightOn = !flashlightOn;
     sheep.setEquipment(rainGear.umbrella, rainGear.raincoat, rainGear.hood, flashlightOn);
-    refreshGear(); rendering.invalidate();
+    refreshEmotes(); rendering.invalidate();
   };
   flashlightButton.addEventListener('click', toggleFlashlight, { signal: emoteEvents.signal });
   const prayerAvailable = () => Boolean(solarState && canPray(solarState.date, solarState.sunrise));
   const refreshEmotes = () => {
     refreshGear();
-    waveButton.disabled = !sheep || overview;
+    const dark = Boolean(solarState && solarState.altitude <= FLASHLIGHT.nightAltitude);
+    waveButton.disabled = !sheep || overview || networkBlocked;
+    primaryActionLabel.textContent = dark ? (flashlightOn ? '끄기' : '켜기') : '인사';
+    primaryActionIcon.setAttribute('href', dark ? '#icon-flashlight' : '#icon-wave');
+    const primaryActionName = dark ? `손전등 ${flashlightOn ? '끄기' : '켜기'}` : '손 흔들기';
+    waveButton.setAttribute('aria-label', primaryActionName);
+    waveButton.title = `${primaryActionName} · 단축키 1`;
     prayButton.disabled = !sheep || overview;
     prayButton.setAttribute('aria-disabled', String(prayButton.disabled || !prayerAvailable()));
     prayButton.dataset.unavailableReason = prayerAvailable() ? '' : PRAYER_NOTICE;
-    waveButton.setAttribute('aria-pressed', String(emotes.current === 'wave'));
+    waveButton.setAttribute('aria-pressed', String(dark ? flashlightOn : emotes.current === 'wave'));
     prayButton.setAttribute('aria-pressed', String(emotes.current === 'pray'));
     emoteStatus.textContent = overview ? '조감 보기에서는 감정표현을 사용할 수 없습니다'
+      : dark ? '1 손전등 켜기·끄기 / 2 소원빌기'
       : emotes.current === 'wave' ? '손 흔드는 중 · 이동하면 종료'
       : emotes.current === 'pray' ? '일출을 보며 소원 비는 중 · 이동하면 종료'
       : prayerAvailable() ? '소원빌기 가능 · 1 인사 / 2 소원빌기 · 이동하면 종료'
@@ -260,7 +270,11 @@ export function createWorld(canvas: HTMLCanvasElement, terrainData: Awaited<Retu
     refreshEmotes();
     rendering.invalidate();
   };
-  waveButton.addEventListener('click', () => startEmote('wave'), { signal: emoteEvents.signal });
+  const primaryAction = () => {
+    if (solarState && solarState.altitude <= FLASHLIGHT.nightAltitude) toggleFlashlight();
+    else startEmote('wave');
+  };
+  waveButton.addEventListener('click', primaryAction, { signal: emoteEvents.signal });
   prayButton.addEventListener('click', () => startEmote('pray'), { signal: emoteEvents.signal });
   window.addEventListener('keydown', event => {
     if (!controls.active() || event.repeat || !['Digit1', 'Digit2', 'Digit3', 'Digit4', 'Digit5', 'Digit6'].includes(event.code)) return;
@@ -269,7 +283,8 @@ export function createWorld(canvas: HTMLCanvasElement, terrainData: Awaited<Retu
     if (['Digit3', 'Digit4', 'Digit5'].includes(event.code)) {
       toggleGear(event.code === 'Digit3' ? 'umbrella' : event.code === 'Digit4' ? 'raincoat' : 'hood'); return;
     }
-    startEmote(event.code === 'Digit1' ? 'wave' : 'pray');
+    if (event.code === 'Digit1') primaryAction();
+    else startEmote('pray');
   }, { signal: emoteEvents.signal });
   let eyeHeight = observer.eyeHeight;
   let walkedDistance = 0;
@@ -415,7 +430,7 @@ export function createWorld(canvas: HTMLCanvasElement, terrainData: Awaited<Retu
       camera.position.x = state.x; camera.position.z = state.z;
       if (sheep) sheep.group.rotation.y = state.yaw;
       rainGear.apply(state.equipment);
-      flashlightOn = Boolean(state.equipment.flashlight && solarState && solarState.altitude <= FLASHLIGHT.nightAltitude);
+      flashlightOn = Boolean((state.equipment.flashlight ?? flashlightOn) && solarState && solarState.altitude <= FLASHLIGHT.nightAltitude);
       sheep?.setEquipment(rainGear.umbrella, rainGear.raincoat, rainGear.hood, flashlightOn);
       placeObserver(); refreshEmotes(); rendering.invalidate();
     },
@@ -465,10 +480,11 @@ export function createWorld(canvas: HTMLCanvasElement, terrainData: Awaited<Retu
       placeObserver();
     },
     update(state: SunState) {
+      const nextFlashlightOn = flashlightAfterSunUpdate(flashlightOn, solarState?.altitude, state.altitude);
       solarState = state;
-      if (flashlightOn && state.altitude > FLASHLIGHT.nightAltitude) {
-        flashlightOn = false;
-        sheep?.setEquipment(rainGear.umbrella, rainGear.raincoat, rainGear.hood, false);
+      if (flashlightOn !== nextFlashlightOn) {
+        flashlightOn = nextFlashlightOn;
+        sheep?.setEquipment(rainGear.umbrella, rainGear.raincoat, rainGear.hood, flashlightOn);
       }
       emotes.update(0, false, prayerAvailable());
       refreshEmotes();