import { clsx, type ClassValue } from "clsx";
import { twMerge } from "tailwind-merge";

export function cn(...inputs: ClassValue[]) {
  return twMerge(clsx(inputs));
}

export function initials(name: string) {
  return name
    .split(/\s+/)
    .filter(Boolean)
    .slice(0, 2)
    .map((p) => p[0]?.toUpperCase())
    .join("");
}

export function truncate(s: string, n = 40) {
  return s.length > n ? s.slice(0, n - 1) + "…" : s;
}

export function safeJson<T = unknown>(s: string | null | undefined, fallback: T): T {
  if (!s) return fallback;
  try {
    return JSON.parse(s) as T;
  } catch {
    return fallback;
  }
}

export function pct(part: number, total: number) {
  if (!total) return 0;
  return Math.round((part / total) * 1000) / 10;
}

export function delta(current: number, previous: number): number | null {
  if (previous === 0) return current === 0 ? 0 : null;
  return Math.round(((current - previous) / Math.abs(previous)) * 1000) / 10;
}