export function formatBytes(n: number): string {
	if (n >= 1e9) return `${(n / 1e9).toFixed(2)} GB`;
	if (n >= 1e6) return `${Math.round(n / 1e6)} MB`;
	if (n >= 1e3) return `${Math.round(n / 1e3)} KB`;
	return `${n} B`;
}

export function formatDate(iso: string | null): string {
	if (!iso) return "—";
	return new Date(iso).toLocaleDateString(undefined, { day: "2-digit", month: "short", year: "numeric" });
}

/** Zero-padded two-digit number: 6 → "06". */
export const pad2 = (n: number) => String(n).padStart(2, "0");

/** FNV-1a string hash → uint32; seeds placeholder colours. */
export function hash(str: string): number {
	let h = 0x811c9dc5;
	for (let i = 0; i < str.length; i++) {
		h ^= str.charCodeAt(i);
		h = Math.imul(h, 0x01000193);
	}
	return h >>> 0;
}

/** Short tag for a base model folder: "MOSS-Image" → "MOSS", "Krea2" → "Krea2". */
export const modelLabel = (id: string) => id.split("-")[0];