export function fmtNum(n: number | string | null | undefined, digits = 0): string {
  if (n === null || n === undefined || n === "") return "—";
  const v = Number(n);
  if (Number.isNaN(v)) return String(n);
  if (Math.abs(v) >= 1e9) return (v / 1e9).toFixed(1) + "B";
  if (Math.abs(v) >= 1e6) return (v / 1e6).toFixed(1) + "M";
  if (Math.abs(v) >= 1e4) return (v / 1e3).toFixed(1) + "k";
  return v.toLocaleString("en-US", { maximumFractionDigits: digits });
}

export function fmtPct(n: number | null | undefined, digits = 0): string {
  if (n === null || n === undefined || Number.isNaN(Number(n))) return "—";
  return `${(Number(n) * 100).toFixed(digits)}%`;
}

export function fmtDuration(s: number | null | undefined): string {
  if (!s && s !== 0) return "—";
  const v = Math.round(Number(s));
  const h = Math.floor(v / 3600);
  const m = Math.floor((v % 3600) / 60);
  const sec = v % 60;
  return h ? `${h}:${String(m).padStart(2, "0")}:${String(sec).padStart(2, "0")}` : `${m}:${String(sec).padStart(2, "0")}`;
}

export function fmtTime(ts: string | Date | null | undefined): string {
  if (!ts) return "—";
  const d = new Date(ts);
  return d.toLocaleTimeString("en-CA", { hour12: false });
}

export function fmtDate(ts: string | Date | null | undefined): string {
  if (!ts) return "—";
  const d = new Date(ts);
  return d.toLocaleString("en-CA", { hour12: false, month: "short", day: "2-digit", hour: "2-digit", minute: "2-digit" });
}

export function ago(ts: string | Date | null | undefined): string {
  if (!ts) return "—";
  const diff = (Date.now() - new Date(ts).getTime()) / 1000;
  if (diff < 60) return `${Math.max(0, Math.round(diff))}s ago`;
  if (diff < 3600) return `${Math.round(diff / 60)}m ago`;
  if (diff < 86400) return `${Math.round(diff / 3600)}h ago`;
  return `${Math.round(diff / 86400)}d ago`;
}

export function truncate(s: string | null | undefined, n: number): string {
  if (!s) return "";
  return s.length > n ? s.slice(0, n - 1) + "…" : s;
}

export const TYPE_COLORS: Record<string, string> = {
  video: "#38e1ff",
  channel: "#9d7bff",
  profile: "#9d7bff",
  person: "#9d7bff",
  post: "#ffb347",
  comment: "#ff7ad9",
  community: "#43e69a",
  page: "#43e69a",
  hashtag: "#6b7a8c",
  image: "#38e1ff",
  organization: "#43e69a",
};

export const EVENT_COLORS: Record<string, string> = {
  ACTION_PLANNED: "#ffb347",
  ACTION_EXECUTED: "#43e69a",
  ACTION_FAILED: "#ff5c7a",
  PAGE_OPENED: "#38e1ff",
  NETWORK_SCHEMA_DISCOVERED: "#9d7bff",
  CONNECTOR_PATTERN_LEARNED: "#9d7bff",
  CONNECTOR_DEGRADED: "#ff5c7a",
  CONNECTOR_REPAIRED: "#43e69a",
  LOOP_DETECTED: "#ff5c7a",
  AUTH_REQUIRED: "#ff5c7a",
  MEDIA_DISCOVERED: "#ff7ad9",
  VIDEO_DISCOVERED: "#38e1ff",
  POST_DISCOVERED: "#ffb347",
  PROFILE_DISCOVERED: "#9d7bff",
};

export function eventColor(t: string): string {
  return EVENT_COLORS[t] ?? "#6b7a8c";
}