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src/lib/utils/game.ts

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+import { bibleBooks, type BibleBook } from '$lib/types/bible';
+
+export function getBookById(id: string): BibleBook | undefined {
+	return bibleBooks.find((b) => b.id === id);
+}
+
+export function isAdjacent(id1: string, id2: string): boolean {
+	const b1 = getBookById(id1);
+	const b2 = getBookById(id2);
+	return !!(b1 && b2 && Math.abs(b1.order - b2.order) === 1);
+}
+
+export function getGrade(numGuesses: number, popularity: number): string {
+	const difficulty = 14 - popularity;
+	const performanceScore = Math.max(0, 10 - numGuesses);
+	const totalScore = performanceScore + difficulty * 0.8;
+	if (totalScore >= 14) return "🟢 S";
+	if (totalScore >= 11) return "🟢 A";
+	if (totalScore >= 8) return "🟡 B";
+	if (totalScore >= 5) return "🟠 C";
+	return "🔴 C-";
+}
+
+export function toOrdinal(n: number): string {
+	if (n >= 11 && n <= 13) {
+		return `${n}th`;
+	}
+	const mod = n % 10;
+	const suffix = mod === 1 ? "st" : mod === 2 ? "nd" : mod === 3 ? "rd" : "th";
+	return `${n}${suffix}`;
+}
+
+export function generateUUID(): string {
+	if (typeof window !== 'undefined' && typeof (window as any).crypto?.randomUUID === "function") {
+		return (window as any).crypto.randomUUID();
+	}
+	// Fallback
+	return "xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx".replace(/[xy]/g, (c) => {
+		const r = ((window as any).crypto.getRandomValues(new Uint8Array(1))[0] % 16) | 0;
+		const v = c === "x" ? r : (r & 0x3) | 0x8;
+		return v.toString(16);
+	});
+}