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 /**
  * Canary tests pinning the three.js clipping internals that
  * `ThreeService.dropClippingShaderState()` compensates for.
  *
  * Built shader states bind clipping planes to the ARRAY INSTANCE their
  * ClippingContext held at build time, and the state cache is keyed by plane
  * COUNTS. ClippingContext.update() REPLACES its arrays whenever the parent
  * group chain changes (an outer clipping group toggled on or off), so a
  * toggle that returns to a previously-seen count shape would reuse a shader
  * bound to an orphaned array whose view-space values are never re-projected
  * again — the cut freezes to the camera. Firebird's answer is to dispose the
  * clipped geometry's materials on every clipping STRUCTURE change, which
  * releases their render objects and, through three's reference counting,
  * the built node states (see dropClippingShaderState in three.service.ts).
  *
  * These tests assert that three still behaves that way. If a three upgrade
  * makes the "replaces arrays" test fail, the upstream defect is likely fixed
  * — re-evaluate whether dropClippingShaderState() still needs to evict the
  * node states.
  *
  * The `three/src/...` import below is TEST-ONLY and deliberate: the class is
  * not exported from `three/webgpu`, and this spec never runs in the browser
  * bundle (where a second copy of three's node system would corrupt TSL
  * state). Do not copy this import into app code.
  */
 import ClippingContext from 'three/src/renderers/common/ClippingContext.js';
 import { Matrix4, Plane, Vector3 } from 'three';
 
 type AnyCtx = {
   cacheKey: string;
   intersectionPlanes: { x: number; y: number; z: number; w: number }[];
   unionPlanes: { x: number; y: number; z: number; w: number }[];
   updateGlobal(scene: unknown, camera: unknown): void;
   getGroupContext(group: unknown): AnyCtx;
 };
 
 function makeGroup(planes: Plane[], clipIntersection: boolean) {
   return { isClippingGroup: true, enabled: true, clipShadows: false, clipIntersection, clippingPlanes: planes };
 }
 
 function makeCamera() {
   return { matrixWorldInverse: new Matrix4() };
 }
 
 const SCENE = { overrideMaterial: null };
 
 describe('three ClippingContext internals (pinned)', () => {
   it('REPLACES plane arrays when the parent group chain changes (why the node cache must be evicted)', () => {
     const root = new ClippingContext() as AnyCtx;
     root.updateGlobal(SCENE, makeCamera());
 
     const zGroup = makeGroup([new Plane(new Vector3(0, 0, 1), 0)], false);
     const wedgeGroup = makeGroup(
       [new Plane(new Vector3(0, -1, 0), 0), new Plane(new Vector3(1, 0, 0), 0)],
       true,
     );
 
     // Angular only: wedge context parented to the root.
     const wedgeCtx = root.getGroupContext(wedgeGroup);
     const intersection = wedgeCtx.intersectionPlanes; // what a built shader captures
     expect(intersection.length).toBe(2);
 
     // Z group enabled: the wedge context is reparented under the Z context.
     // three resyncs by REPLACING both arrays — the captured `intersection`
     // instance is orphaned. A cached shader state keeps reading it.
     const zCtx = root.getGroupContext(zGroup);
     const wedgeCtxUnderZ = zCtx.getGroupContext(wedgeGroup);
     expect(wedgeCtxUnderZ).toBe(wedgeCtx); // one context per group, whatever the parent
     expect(wedgeCtx.intersectionPlanes).not.toBe(intersection);
     // If this starts failing (arrays kept stable), three fixed the defect:
     // re-evaluate dropClippingShaderState()'s eviction.
   });
 
   it('re-projects plane VALUES into the current arrays on every update call (per-view value swaps)', () => {
     // RenderView.clipPlane relies on this: sequential per-view renders write
     // different values into ONE shared plane, and every render call
     // re-projects them with the current camera.
     const root = new ClippingContext() as AnyCtx;
     const camera = makeCamera();
     root.updateGlobal(SCENE, camera);
 
     const group = makeGroup([new Plane(new Vector3(0, -1, 0), 0)], true);
     const ctx = root.getGroupContext(group);
     const held = ctx.intersectionPlanes;
     const before = held[0].w;
 
     camera.matrixWorldInverse.makeTranslation(0, 100, 0);
     root.updateGlobal(SCENE, camera);
     root.getGroupContext(group); // per-render update path
 
     expect(ctx.intersectionPlanes).toBe(held); // no structure change, no replacement
     expect(held[0].w).not.toBe(before);
   });
 
   it('cache key carries the context id — sibling groups with equal shapes no longer collide', () => {
     // Through three r185 the key was plane COUNTS only ("0:1"), so two
     // sibling groups with the same shape shared one built shader state bound
     // to ONE group's plane array, and the other group clipped with the wrong
     // planes. three r186 prefixes the context id ("<id>:0:1"), which gives
     // every group its own state. ClippedGeometrySlice keeps its distinct
     // (1 intersection : 0 union) shape as a guard: if the two keys below
     // become equal again, that distinct shape is load-bearing once more.
     const root = new ClippingContext() as AnyCtx;
     root.updateGlobal(SCENE, makeCamera());
 
     const groupA = makeGroup([new Plane(new Vector3(0, 0, 1), 0)], false);
     const groupB = makeGroup([new Plane(new Vector3(1, 0, 0), 500)], false);
     const ctxA = root.getGroupContext(groupA);
     const ctxB = root.getGroupContext(groupB);
     const countShape = (key: string) => key.split(':').slice(-2).join(':');
 
     expect(ctxA).not.toBe(ctxB);
     expect(countShape(ctxA.cacheKey)).toBe(countShape(ctxB.cacheKey)); // same shape "0:1"
     expect(ctxA.cacheKey).not.toBe(ctxB.cacheKey); // distinct keys since r186
 
     // The slice's intersection-mode single plane still has a distinct shape:
     const sliceLike = makeGroup([new Plane(new Vector3(0, -1, 0), 0)], true);
     expect(countShape(root.getGroupContext(sliceLike).cacheKey)).not.toBe(countShape(ctxA.cacheKey));
   });
 });

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