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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 | 38x 38x 38x 24x 24x 38x 49x 43x 43x 6x 6x 24x 24x 24x 24x 24x 2x 2x 22x 22x 22x 41x 22x 22x 22x 22x 6x 6x 6x 6x | import type { KPattern } from 'cubing/kpuzzle';
import { faceletsToPattern, kpuzzleReady } from './utils';
/**
* Tracks the body-frame permutation that TwistyPlayer should be showing.
*
* This is deliberately an adapter: cubing.js supplies the tested 3×3
* permutation tables. The domain `PlayerSync` reducer decides only when an
* authoritative snapshot should be applied or released.
*/
export function createPatternReconciler() {
let expected: KPattern | undefined;
let movesBeforeFirstSnapshot: string[] = [];
let snapshotGeneration = 0;
const pendingSnapshots: { expectedAtCapture: KPattern | undefined; movesAfter: string[] }[] = [];
function removeSnapshot(snapshot: (typeof pendingSnapshots)[number]): void {
const index = pendingSnapshots.indexOf(snapshot);
if (index >= 0) pendingSnapshots.splice(index, 1);
}
return {
applyMove(move: string): void {
if (!expected) {
movesBeforeFirstSnapshot.push(move);
return;
}
expected = expected.applyMove(move);
for (const snapshot of pendingSnapshots) snapshot.movesAfter.push(move);
},
async observeSnapshot(facelets: string): Promise<boolean> {
// Capture the expected permutation before awaiting kpuzzle loading. BLE
// moves may arrive during that await; they belong after this snapshot,
// not in the comparison against it.
const snapshot = { expectedAtCapture: expected, movesAfter: [] as string[] };
const generation = ++snapshotGeneration;
pendingSnapshots.push(snapshot);
await kpuzzleReady;
if (generation !== snapshotGeneration) {
removeSnapshot(snapshot);
return true;
}
const actual = faceletsToPattern(facelets);
const matchesExpected = snapshot.expectedAtCapture?.isIdentical(actual) ?? false;
expected = actual;
for (const move of movesBeforeFirstSnapshot) expected = expected.applyMove(move);
movesBeforeFirstSnapshot = [];
for (const move of snapshot.movesAfter) expected = expected.applyMove(move);
removeSnapshot(snapshot);
return !matchesExpected;
},
reset(): void {
expected = undefined;
movesBeforeFirstSnapshot = [];
snapshotGeneration += 1;
pendingSnapshots.length = 0;
},
};
}
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