Money: wish list sorted by tier then price (desc), theme-aware tier colours

src/lib/money-tracker/wishlist.test.ts

@@ -0,0 +1,26 @@
+import { describe, expect, it } from 'vitest';
+import { sortWishlist, tierClass } from './wishlist';
+
+describe('wish list order', () => {
+	it('sorts by tier descending, then price descending, unpriced and untiered last', () => {
+		const items = [
+			{ id: 1, priority: 3, estimatedCents: 5000 },
+			{ id: 2, priority: 5, estimatedCents: 1000 },
+			{ id: 3, priority: 5, estimatedCents: null },
+			{ id: 4, priority: 5, estimatedCents: 90000 },
+			{ id: 5, priority: null, estimatedCents: 99999 },
+			{ id: 6, priority: 1, estimatedCents: 200 },
+			{ id: 7, priority: 3, estimatedCents: 25000 },
+			{ id: 8, priority: 3, estimatedCents: 5000 }
+		];
+		expect(sortWishlist(items).map((item) => item.id)).toEqual([4, 2, 3, 7, 1, 8, 6, 5]);
+		expect(items[0].id).toBe(1);
+	});
+
+	it('maps tiers to colour classes', () => {
+		expect(tierClass(5)).toBe('tier-5');
+		expect(tierClass(1)).toBe('tier-1');
+		expect(tierClass(null)).toBe('tier-none');
+		expect(tierClass(9)).toBe('tier-none');
+	});
+});

src/lib/money-tracker/wishlist.ts

@@ -0,0 +1,25 @@
+export type WishSortable = {
+	id?: number;
+	priority: number | null;
+	estimatedCents: number | null;
+};
+
+/**
+ * Wish list order: tier 5 first down to tier 1, then the most expensive first within a tier.
+ * Items without a tier sink below every tier; unpriced items sink to the end of their tier.
+ */
+export function sortWishlist<T extends WishSortable>(items: readonly T[]): T[] {
+	const rank = (value: number | null) => (value == null ? -Infinity : value);
+	return [...items].sort(
+		(a, b) =>
+			rank(b.priority) - rank(a.priority) ||
+			(a.estimatedCents == null ? 1 : 0) - (b.estimatedCents == null ? 1 : 0) ||
+			(b.estimatedCents ?? 0) - (a.estimatedCents ?? 0) ||
+			(a.id ?? 0) - (b.id ?? 0)
+	);
+}
+
+/** CSS class for a tier colour (tier-1 … tier-5), or "tier-none". */
+export function tierClass(priority: number | null): string {
+	return priority != null && priority >= 1 && priority <= 5 ? `tier-${priority}` : 'tier-none';
+}