simplify tilt calculations

tools/reduceTilts.ts

@@ -0,0 +1,34 @@
+import { log, validTilt } from '@/tools';
+import { GameUpdate, Tilt } from '@/types';
+
+const combineTilts = (tilts: Tilt[]) =>
+	tilts.reduce(
+		({ pX, pY, rX, rY, count }, { percentX, percentY, rotateX, rotateY }) => ({
+			pX: pX + percentX,
+			pY: pY + percentY,
+			rX: rX + rotateX,
+			rY: rY + rotateY,
+			count: count + 1,
+		}),
+		{ pX: 0, pY: 0, rX: 0, rY: 0, count: 0 },
+	);
+
+export function reduceTilts(gameData: GameUpdate, localTilt: Tilt[]): Tilt[] {
+	const remoteTilts = gameData.tilts;
+	const tiltEnabled = gameData.settings.tilt;
+	const remoteTiltEnabled = gameData.settings.remoteTilt;
+
+	if (!tiltEnabled) return [];
+	if (!remoteTiltEnabled) return Array.from({ length: 5 }, (_, i) => localTilt[i]);
+
+	return Array.from({ length: 5 }, (_, i) => (localTilt[i] ? [localTilt[i]] : []))
+		.map((cardTilts, cardIndex) => [...remoteTilts[cardIndex], ...cardTilts])
+		.map((cardTilts) => cardTilts.filter(validTilt))
+		.map(combineTilts)
+		.map(({ pX, pY, rX, rY, count }) => ({
+			percentX: count ? pX / count : -1,
+			percentY: count ? pY / count : -1,
+			rotateX: count ? rX / count : 0,
+			rotateY: count ? rY / count : 0,
+		}));
+}