import type { Severity, SeverityCounts } from "@/shared/types";

export function formatStars(n: number): string {
  if (n >= 1_000_000) return `${(n / 1_000_000).toFixed(1).replace(/\.0$/, "")}M`;
  if (n >= 1_000) return `${(n / 1_000).toFixed(1).replace(/\.0$/, "")}k`;
  return String(n);
}

export function formatRelativeTime(iso: string | null | undefined): string {
  if (!iso) return "—";
  const then = new Date(iso).getTime();
  if (Number.isNaN(then)) return "—";
  const diffSec = Math.round((then - Date.now()) / 1000);
  const rtf = new Intl.RelativeTimeFormat("en", { numeric: "auto" });
  const abs = Math.abs(diffSec);
  if (abs < 60) return rtf.format(diffSec, "second");
  const diffMin = Math.round(diffSec / 60);
  if (Math.abs(diffMin) < 60) return rtf.format(diffMin, "minute");
  const diffHr = Math.round(diffMin / 60);
  if (Math.abs(diffHr) < 48) return rtf.format(diffHr, "hour");
  const diffDay = Math.round(diffHr / 24);
  if (Math.abs(diffDay) < 60) return rtf.format(diffDay, "day");
  const diffMo = Math.round(diffDay / 30);
  return rtf.format(diffMo, "month");
}

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

export function shortSha(sha: string | null | undefined): string {
  if (!sha) return "—";
  return sha.slice(0, 7);
}

export function totalFindings(c: SeverityCounts): number {
  return c.critical + c.high + c.medium + c.low;
}

export const SEV_ORDER: Severity[] = ["critical", "high", "medium", "low"];

export function severityLabel(s: Severity): string {
  return s.charAt(0).toUpperCase() + s.slice(1);
}