export function randomWalk(value: number, step: number, minimum = 0, maximum = 100): number {
	const next = value + (Math.random() * 2 - 1) * step;
	return Math.min(maximum, Math.max(minimum, next));
}

export function usageTone(percent: number): string {
	if (percent >= 80) return 'red';
	if (percent >= 50) return 'yellow';
	return 'green';
}

export function relativeTime(isoDate: string): string {
	const elapsedMinutes = Math.floor((Date.now() - new Date(isoDate).getTime()) / 60000);
	if (elapsedMinutes < 60) return `${elapsedMinutes}m`;
	const elapsedHours = Math.floor(elapsedMinutes / 60);
	if (elapsedHours < 24) return `${elapsedHours}h`;
	const elapsedDays = Math.floor(elapsedHours / 24);
	if (elapsedDays < 60) return `${elapsedDays}d`;
	return `${Math.floor(elapsedDays / 30)}mo`;
}

export function formatSize(sizeKb: number): string {
	if (sizeKb >= 1024 * 1024) return `${(sizeKb / 1024 / 1024).toFixed(1)}G`;
	if (sizeKb >= 1024) return `${(sizeKb / 1024).toFixed(1)}M`;
	return `${sizeKb}K`;
}