feat: save games and edit scene darkness

Persist show state to local saves; author map darkness in scene editor with bake-to-scene and help updates.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/renderer/sceneEditor/SceneEditorApp.tsx

@@ -7,14 +7,21 @@ import type {
   NpcDisposition,
   NpcId,
   ProjectNpc,
+  Scene,
+  SceneDarknessBrushShape,
+  SceneDarknessDraft,
+  SceneDarknessRevealStroke,
+  SceneDarknessState,
   SceneGrid,
   SceneGridTemplate,
+  SceneId,
   SceneNpcToken,
   SceneToken,
   SceneTrap,
   SceneTrapType,
   TokenId,
 } from '../../shared/types';
+import { SceneDarknessOverlay } from '../shared/effects/SceneDarknessOverlay';
 import {
   asSceneNpcTokenId,
   clampSceneNpcTokenSizeN,
@@ -237,6 +244,24 @@ function SceneNpcMarker({
   );
 }
 
+function sameDarknessStrokes(
+  a: readonly SceneDarknessRevealStroke[],
+  b: readonly SceneDarknessRevealStroke[],
+): boolean {
+  if (a === b) return true;
+  if (a.length !== b.length) return false;
+  for (let i = 0; i < a.length; i += 1) {
+    const left = a[i];
+    const right = b[i];
+    if (!left || !right) return false;
+    if (left.id !== right.id || left.points.length !== right.points.length) return false;
+    if (left.radiusN !== right.radiusN || left.mode !== right.mode || left.shape !== right.shape) {
+      return false;
+    }
+  }
+  return true;
+}
+
 function NpcPaletteTile({ npc }: { npc: ProjectNpc }) {
   const imageUrl = useAssetUrl(npc.avatarAssetId);
   const disposition = normalizeNpcDisposition(npc.disposition);
@@ -270,8 +295,28 @@ export function SceneEditorApp() {
   const [session, setSession] = useState<SessionState | null>(null);
   const [trapsOpen, setTrapsOpen] = useState(false);
   const [gridOpen, setGridOpen] = useState(false);
+  const [darknessOpen, setDarknessOpen] = useState(false);
   const [tokensOpen, setTokensOpen] = useState(false);
   const [npcsOpen, setNpcsOpen] = useState(false);
+  const [localDarken, setLocalDarken] = useState(false);
+  const [localDarknessStrokes, setLocalDarknessStrokes] = useState<SceneDarknessRevealStroke[]>([]);
+  const [darknessDraft, setDarknessDraft] = useState<SceneDarknessDraft | null>(null);
+  const [darknessTool, setDarknessTool] = useState<'none' | 'explore' | 'close'>('none');
+  const [darknessRadiusN, setDarknessRadiusN] = useState(0.08);
+  const [darknessBrushShape, setDarknessBrushShape] = useState<SceneDarknessBrushShape>('circle');
+  const darknessBrushRef = useRef<{
+    points: { x: number; y: number; tMs: number }[];
+    createdAtMs: number;
+    seed: number;
+  } | null>(null);
+  const brushCursorElRef = useRef<HTMLDivElement | null>(null);
+  const darknessCursorPosRef = useRef<{ x: number; y: number } | null>(null);
+  const darknessToolRef = useRef(darknessTool);
+  const darknessRadiusNRef = useRef(darknessRadiusN);
+  const darknessBrushShapeRef = useRef(darknessBrushShape);
+  darknessToolRef.current = darknessTool;
+  darknessRadiusNRef.current = darknessRadiusN;
+  darknessBrushShapeRef.current = darknessBrushShape;
   const [tokenSearch, setTokenSearch] = useState('');
   const [npcSearch, setNpcSearch] = useState('');
   const [tokenModal, setTokenModal] = useState<
@@ -291,16 +336,23 @@ export function SceneEditorApp() {
   const [selected, setSelected] = useState<Selection>(null);
   const [view, setView] = useState<LocalView>({ scale: 1, ox: 0.5, oy: 0.5 });
   const [contentRect, setContentRect] = useState<{ x: number; y: number; w: number; h: number } | null>(null);
+  const contentRectRef = useRef(contentRect);
+  contentRectRef.current = contentRect;
   const hostRef = useRef<HTMLDivElement | null>(null);
   const dragRef = useRef<DragMode>(null);
   const saveTrapsTimerRef = useRef(0);
   const saveTokensTimerRef = useRef(0);
   const saveNpcTokensTimerRef = useRef(0);
   const saveGridTimerRef = useRef(0);
+  const saveDarknessTimerRef = useRef(0);
+  const pendingDarknessStrokesRef = useRef<SceneDarknessRevealStroke[] | null>(null);
+  const darknessDirtyRef = useRef(false);
   const spaceDownRef = useRef(false);
+  const sceneIdRef = useRef<SceneId | null>(null);
 
   const project = session?.project ?? null;
   const sceneId = project?.currentSceneId ?? null;
+  sceneIdRef.current = sceneId;
   const scene = sceneId && project ? project.scenes[sceneId] : undefined;
   const url = useAssetUrl(scene?.previewAssetId ?? null);
   const rot = scene?.previewRotationDeg ?? 0;
@@ -316,6 +368,7 @@ export function SceneEditorApp() {
   const trapsRef = useRef<SceneTrap[]>([]);
   const tokensRef = useRef<SceneToken[]>([]);
   const npcTokensRef = useRef<SceneNpcToken[]>([]);
+  const localDarknessStrokesRef = useRef<SceneDarknessRevealStroke[]>([]);
 
   useEffect(() => {
     trapsRef.current = localTraps;
@@ -324,12 +377,28 @@ export function SceneEditorApp() {
   }, [localNpcTokens, localTokens, localTraps]);
 
   useEffect(() => {
+    localDarknessStrokesRef.current = localDarknessStrokes;
+  }, [localDarknessStrokes]);
+
+  useEffect(() => {
+    darknessDirtyRef.current = false;
+    pendingDarknessStrokesRef.current = null;
+    if (saveDarknessTimerRef.current) {
+      window.clearTimeout(saveDarknessTimerRef.current);
+      saveDarknessTimerRef.current = 0;
+    }
     setLocalTraps(scene?.traps ?? []);
     setLocalTokens((scene?.tokens ?? []).filter((t) => appTokens.some((a) => a.id === t.tokenId)));
     setLocalNpcTokens(
       (scene?.npcTokens ?? []).filter((t) => project?.npcs.some((npc) => npc.id === t.npcId)),
     );
     setLocalGrid(scene?.grid ?? { ...DEFAULT_SCENE_GRID });
+    setLocalDarken(Boolean(scene?.darkenScene));
+    const strokes = scene?.darknessStrokes ?? [];
+    localDarknessStrokesRef.current = strokes;
+    setLocalDarknessStrokes(strokes);
+    setDarknessDraft(null);
+    setDarknessTool('none');
     setSelected(null);
     setView({ scale: 1, ox: 0.5, oy: 0.5 });
   }, [sceneId, scene?.previewAssetId]);
@@ -356,6 +425,16 @@ export function SceneEditorApp() {
     setLocalGrid(scene?.grid ?? { ...DEFAULT_SCENE_GRID });
   }, [scene?.grid]);
 
+  useEffect(() => {
+    // IPC session clones arrays — do not clobber unsaved local darkness edits.
+    if (darknessBrushRef.current || darknessDirtyRef.current || saveDarknessTimerRef.current) return;
+    setLocalDarken(Boolean(scene?.darkenScene));
+    const incoming = scene?.darknessStrokes ?? [];
+    if (sameDarknessStrokes(incoming, localDarknessStrokesRef.current)) return;
+    localDarknessStrokesRef.current = incoming;
+    setLocalDarknessStrokes(incoming);
+  }, [scene?.darkenScene, scene?.darknessStrokes]);
+
   useEffect(() => {
     void api.invoke(ipcChannels.project.get, {}).then(({ project: p }) => {
       setSession({ project: p, currentSceneId: p?.currentSceneId ?? null });
@@ -404,6 +483,99 @@ export function SceneEditorApp() {
     [api, sceneId],
   );
 
+  const mergeSceneIntoSession = useCallback((updated: Scene) => {
+    setSession((prev) => {
+      if (!prev?.project?.scenes[updated.id]) return prev;
+      return {
+        ...prev,
+        project: {
+          ...prev.project,
+          scenes: { ...prev.project.scenes, [updated.id]: updated },
+        },
+      };
+    });
+  }, []);
+
+  const flushDarknessStrokes = useCallback(async () => {
+    const sid = sceneIdRef.current;
+    const payload = pendingDarknessStrokesRef.current;
+    if (saveDarknessTimerRef.current) {
+      window.clearTimeout(saveDarknessTimerRef.current);
+      saveDarknessTimerRef.current = 0;
+    }
+    if (!sid || !payload) return;
+    pendingDarknessStrokesRef.current = null;
+    try {
+      const res = await api.invoke(ipcChannels.project.updateScene, {
+        sceneId: sid,
+        patch: { darknessStrokes: payload },
+      });
+      darknessDirtyRef.current = false;
+      mergeSceneIntoSession(res.scene);
+    } catch {
+      // Keep dirty so a later flush / session sync can retry from local ref.
+      pendingDarknessStrokesRef.current = payload;
+      darknessDirtyRef.current = true;
+    }
+  }, [api, mergeSceneIntoSession]);
+
+  const persistDarken = useCallback(
+    (next: boolean) => {
+      const sid = sceneIdRef.current;
+      if (!sid) return;
+      setLocalDarken(next);
+      if (!next) setDarknessTool('none');
+      darknessDirtyRef.current = true;
+      void (async () => {
+        await flushDarknessStrokes();
+        try {
+          const res = await api.invoke(ipcChannels.project.updateScene, {
+            sceneId: sid,
+            patch: { darkenScene: next },
+          });
+          darknessDirtyRef.current = false;
+          mergeSceneIntoSession(res.scene);
+        } catch {
+          darknessDirtyRef.current = true;
+        }
+      })();
+    },
+    [api, flushDarknessStrokes, mergeSceneIntoSession],
+  );
+
+  const persistDarknessStrokes = useCallback(
+    (next: SceneDarknessRevealStroke[]) => {
+      if (!sceneIdRef.current) return;
+      localDarknessStrokesRef.current = next;
+      setLocalDarknessStrokes(next);
+      pendingDarknessStrokesRef.current = next;
+      darknessDirtyRef.current = true;
+      if (saveDarknessTimerRef.current) window.clearTimeout(saveDarknessTimerRef.current);
+      saveDarknessTimerRef.current = window.setTimeout(() => {
+        void flushDarknessStrokes();
+      }, 120);
+    },
+    [flushDarknessStrokes],
+  );
+
+  const flushDarknessStrokesRef = useRef(flushDarknessStrokes);
+  flushDarknessStrokesRef.current = flushDarknessStrokes;
+  useEffect(() => {
+    const flush = () => {
+      void flushDarknessStrokesRef.current();
+    };
+    const onVis = () => {
+      if (document.hidden) flush();
+    };
+    window.addEventListener('blur', flush);
+    document.addEventListener('visibilitychange', onVis);
+    return () => {
+      window.removeEventListener('blur', flush);
+      document.removeEventListener('visibilitychange', onVis);
+      flush();
+    };
+  }, []);
+
   const persistGrid = useCallback(
     (next: SceneGrid) => {
       if (!sceneId) return;
@@ -504,6 +676,34 @@ export function SceneEditorApp() {
     };
   };
 
+  const layoutDarknessBrushCursor = () => {
+    const el = brushCursorElRef.current;
+    const p = darknessCursorPosRef.current;
+    const cr = contentRectRef.current;
+    if (!el) return;
+    if (!p || !cr || darknessToolRef.current === 'none') {
+      el.style.visibility = 'hidden';
+      return;
+    }
+    el.style.visibility = 'visible';
+    el.className = [
+      styles.brushCursor,
+      darknessBrushShapeRef.current === 'square' ? styles.brushCursorSquare : '',
+    ]
+      .filter(Boolean)
+      .join(' ');
+    const minDim = Math.min(cr.w, cr.h);
+    const size = Math.max(1, darknessRadiusNRef.current * minDim * 2);
+    el.style.left = `${String(cr.x + p.x * cr.w)}px`;
+    el.style.top = `${String(cr.y + p.y * cr.h)}px`;
+    el.style.width = `${String(size)}px`;
+    el.style.height = `${String(size)}px`;
+  };
+
+  useEffect(() => {
+    layoutDarknessBrushCursor();
+  }, [darknessBrushShape, darknessRadiusN, darknessTool, contentRect]);
+
   const viewCamera = useMemo(() => view, [view]);
 
   useEffect(() => {
@@ -632,6 +832,17 @@ export function SceneEditorApp() {
   const isVideo = scene?.previewAssetType === 'video' && Boolean(url);
   const hasMapMedia = isImage || isVideo;
 
+  const darknessOverlayState = useMemo((): SceneDarknessState | null => {
+    if (!localDarken) return null;
+    return {
+      revision: 1,
+      enabled: true,
+      cacheKey: sceneId,
+      strokes: localDarknessStrokes,
+      draft: darknessDraft,
+    };
+  }, [darknessDraft, localDarken, localDarknessStrokes, sceneId]);
+
   return (
     <div className={styles.page}>
       <aside className={styles.sidebar}>
@@ -828,6 +1039,98 @@ export function SceneEditorApp() {
           ) : null}
         </div>
 
+        <div className={styles.accordion} data-testid="scene-darkness-accordion">
+          <button
+            type="button"
+            className={styles.accordionHead}
+            onClick={() => setDarknessOpen((v) => !v)}
+          >
+            {t('sceneEditor.darkness')} {darknessOpen ? '▾' : '▸'}
+          </button>
+          {darknessOpen ? (
+            <div className={styles.gridPanel}>
+              <label className={styles.checkRow}>
+                <input
+                  type="checkbox"
+                  checked={localDarken}
+                  disabled={!hasMapMedia}
+                  onChange={(e) => persistDarken(e.target.checked)}
+                  data-testid="scene-darken-toggle"
+                />
+                <span>{t('scene.darkenScene')}</span>
+              </label>
+              {localDarken && hasMapMedia ? (
+                <>
+                  <div className={styles.darknessTools}>
+                    <Button
+                      variant={darknessTool === 'explore' ? 'primary' : 'ghost'}
+                      iconOnly
+                      title={t('control.explorerBrush')}
+                      ariaLabel={t('control.explorerBrush')}
+                      onClick={() =>
+                        setDarknessTool((prev) => (prev === 'explore' ? 'none' : 'explore'))
+                      }
+                    >
+                      <span aria-hidden>🔦</span>
+                    </Button>
+                    <Button
+                      variant={darknessTool === 'close' ? 'primary' : 'ghost'}
+                      iconOnly
+                      title={t('control.closerBrush')}
+                      ariaLabel={t('control.closerBrush')}
+                      onClick={() =>
+                        setDarknessTool((prev) => (prev === 'close' ? 'none' : 'close'))
+                      }
+                    >
+                      <span aria-hidden>⬛</span>
+                    </Button>
+                  </div>
+                  <label className={styles.field}>
+                    <span className={styles.fieldLabel}>
+                      {t('control.brushRadius')}{' '}
+                      <span className={styles.fieldValue}>
+                        {Math.max(1, Math.min(36, Math.round(darknessRadiusN / 0.005)))}
+                      </span>
+                    </span>
+                    <input
+                      type="range"
+                      className={styles.range}
+                      min={1}
+                      max={36}
+                      step={1}
+                      value={Math.max(1, Math.min(36, Math.round(darknessRadiusN / 0.005)))}
+                      onChange={(e) => {
+                        const ui = Number(e.currentTarget.value);
+                        setDarknessRadiusN(Math.max(1, Math.min(36, Math.round(ui))) * 0.005);
+                      }}
+                    />
+                  </label>
+                  <div className={styles.darknessTools}>
+                    <Button
+                      variant={darknessBrushShape === 'circle' ? 'primary' : 'ghost'}
+                      iconOnly
+                      title={t('control.brushShapeCircle')}
+                      ariaLabel={t('control.brushShapeCircle')}
+                      onClick={() => setDarknessBrushShape('circle')}
+                    >
+                      <span aria-hidden>○</span>
+                    </Button>
+                    <Button
+                      variant={darknessBrushShape === 'square' ? 'primary' : 'ghost'}
+                      iconOnly
+                      title={t('control.brushShapeSquare')}
+                      ariaLabel={t('control.brushShapeSquare')}
+                      onClick={() => setDarknessBrushShape('square')}
+                    >
+                      <span aria-hidden>□</span>
+                    </Button>
+                  </div>
+                </>
+              ) : null}
+            </div>
+          ) : null}
+        </div>
+
         {USERS_BRANCH_FEATURES_ENABLED ? (
         <div className={styles.accordion} data-testid="scene-npc-accordion">
           <button type="button" className={styles.accordionHead} onClick={() => setNpcsOpen((v) => !v)}>
@@ -1071,6 +1374,105 @@ export function SceneEditorApp() {
               />
             )}
             <SceneGridOverlay grid={localGrid} viewport={contentRect} />
+            {localDarken && contentRect ? (
+              <SceneDarknessOverlay
+                state={darknessOverlayState}
+                overlayAlpha={0.55}
+                viewport={contentRect}
+                style={{ zIndex: 28 }}
+              />
+            ) : null}
+            {localDarken && darknessTool !== 'none' && contentRect ? (
+              <>
+                <div
+                  ref={brushCursorElRef}
+                  className={styles.brushCursor}
+                  style={{ visibility: 'hidden' }}
+                  aria-hidden
+                />
+                <div
+                  className={styles.darknessBrushLayer}
+                  style={{
+                    left: contentRect.x,
+                    top: contentRect.y,
+                    width: contentRect.w,
+                    height: contentRect.h,
+                  }}
+                  onPointerEnter={(e) => {
+                    const p = hostToNorm(e.clientX, e.clientY);
+                    if (!p) return;
+                    darknessCursorPosRef.current = p;
+                    layoutDarknessBrushCursor();
+                  }}
+                  onPointerLeave={() => {
+                    darknessCursorPosRef.current = null;
+                    layoutDarknessBrushCursor();
+                  }}
+                  onPointerDown={(e) => {
+                    if (e.button !== 0 || spaceDownRef.current) return;
+                    e.preventDefault();
+                    e.stopPropagation();
+                    const p = hostToNorm(e.clientX, e.clientY);
+                    if (!p) return;
+                    darknessCursorPosRef.current = p;
+                    layoutDarknessBrushCursor();
+                    (e.currentTarget as HTMLDivElement).setPointerCapture(e.pointerId);
+                    const createdAtMs = Date.now();
+                    const seed = Math.floor(Math.random() * 1_000_000_000);
+                    const pt = { x: p.x, y: p.y, tMs: createdAtMs };
+                    darknessBrushRef.current = { points: [pt], createdAtMs, seed };
+                    setDarknessDraft({
+                      points: [pt],
+                      radiusN: darknessRadiusN,
+                      mode: darknessTool === 'close' ? 'cover' : 'reveal',
+                      shape: darknessBrushShape,
+                    });
+                  }}
+                  onPointerMove={(e) => {
+                    const p = hostToNorm(e.clientX, e.clientY);
+                    if (p) {
+                      darknessCursorPosRef.current = p;
+                      layoutDarknessBrushCursor();
+                    }
+                    const brush = darknessBrushRef.current;
+                    if (!brush || (e.buttons & 1) === 0) return;
+                    if (!p) return;
+                    const last = brush.points[brush.points.length - 1];
+                    if (last && Math.hypot(p.x - last.x, p.y - last.y) < 0.002) return;
+                    const pt = { x: p.x, y: p.y, tMs: Date.now() };
+                    brush.points.push(pt);
+                    setDarknessDraft({
+                      points: [...brush.points],
+                      radiusN: darknessRadiusN,
+                      mode: darknessTool === 'close' ? 'cover' : 'reveal',
+                      shape: darknessBrushShape,
+                    });
+                  }}
+                  onPointerUp={() => {
+                    const brush = darknessBrushRef.current;
+                    darknessBrushRef.current = null;
+                    setDarknessDraft(null);
+                    if (!brush || brush.points.length === 0) return;
+                    const stroke: SceneDarknessRevealStroke = {
+                      id: `sd_${String(brush.createdAtMs)}_${String(brush.seed)}`,
+                      seed: brush.seed,
+                      createdAtMs: brush.createdAtMs,
+                      points: brush.points,
+                      radiusN: darknessRadiusN,
+                      mode: darknessTool === 'close' ? 'cover' : 'reveal',
+                      shape: darknessBrushShape,
+                    };
+                    persistDarknessStrokes([...localDarknessStrokesRef.current, stroke]);
+                  }}
+                  onPointerCancel={() => {
+                    darknessBrushRef.current = null;
+                    setDarknessDraft(null);
+                    darknessCursorPosRef.current = null;
+                    layoutDarknessBrushCursor();
+                  }}
+                />
+              </>
+            ) : null}
             <TokenPathsOverlay
               tokens={localTokens}
               npcTokens={USERS_BRANCH_FEATURES_ENABLED ? localNpcTokens : []}