import { DISCIPLINE_LABELS, RESEARCH_MODE_LABELS } from "@autoscholar/schemas";

export function fmtDate(
  d: string | Date | null | undefined,
  opts: Intl.DateTimeFormatOptions = { year: "numeric", month: "long", day: "numeric" },
): string {
  if (!d) return "—";
  return new Intl.DateTimeFormat("en-CA", { timeZone: "UTC", ...opts }).format(new Date(d));
}
export function fmtDateTime(d: string | Date | null | undefined): string {
  if (!d) return "—";
  return new Intl.DateTimeFormat("en-CA", {
    year: "numeric",
    month: "short",
    day: "numeric",
    hour: "2-digit",
    minute: "2-digit",
    second: "2-digit",
    hour12: false,
  }).format(new Date(d));
}
export function ago(d: string | Date | null | undefined): string {
  if (!d) return "never";
  const s = Math.max(0, (Date.now() - new Date(d).getTime()) / 1000);
  if (s < 60) return `${Math.round(s)}s ago`;
  if (s < 3600) return `${Math.round(s / 60)}m ago`;
  if (s < 86400) return `${Math.round(s / 3600)}h ago`;
  return `${Math.round(s / 86400)}d ago`;
}
export function fmtBytes(n: number): string {
  if (n < 1024) return `${n} B`;
  if (n < 1024 ** 2) return `${(n / 1024).toFixed(1)} KB`;
  if (n < 1024 ** 3) return `${(n / 1024 ** 2).toFixed(1)} MB`;
  return `${(n / 1024 ** 3).toFixed(2)} GB`;
}
export function fmtUsd(n: number | string | null | undefined): string {
  return `$${Number(n ?? 0).toFixed(2)}`;
}
export function disciplineLabel(d: string): string {
  return (DISCIPLINE_LABELS as Record<string, string>)[d] ?? d;
}
export function modeLabel(m: string): string {
  return (RESEARCH_MODE_LABELS as Record<string, string>)[m] ?? m;
}
export function shortHash(h: string | null | undefined, n = 12): string {
  return h ? h.slice(0, n) : "—";
}