export function timeAgo(d: Date): string {
  const s = Math.floor((Date.now() - d.getTime()) / 1000);
  if (s < 60) return "just now";
  if (s < 3600) return `${Math.floor(s / 60)}m ago`;
  if (s < 86400) return `${Math.floor(s / 3600)}h ago`;
  return `${Math.floor(s / 86400)}d ago`;
}

export function yesPct(poolYes: string, poolNo: string): number {
  const yes = parseFloat(poolYes);
  const no = parseFloat(poolNo);
  return Math.round((no / (yes + no)) * 100);
}

export function daysLeft(d: Date | null): number | null {
  if (!d) return null;
  return Math.max(0, Math.ceil((d.getTime() - Date.now()) / 86400000));
}

export function formatVol(v: string | number): string {
  const n = typeof v === "string" ? parseFloat(v) : v;
  if (n >= 1_000_000) return `$${(n / 1_000_000).toFixed(1)}M`;
  if (n >= 1000) return `$${(n / 1000).toFixed(1)}K`;
  return `$${Math.round(n)}`;
}

export function isPast(d: Date | null): boolean {
  if (!d) return false;
  return d.getTime() < Date.now();
}

export function formatDate(d: Date): string {
  return d.toLocaleDateString("en-US", { month: "short", day: "numeric", year: "numeric" });
}

export function formatPnl(v: string): string {
  const n = parseFloat(v);
  if (n >= 0) return `+$${n.toLocaleString("en-US", { minimumFractionDigits: 2, maximumFractionDigits: 2 })}`;
  return `-$${Math.abs(n).toLocaleString("en-US", { minimumFractionDigits: 2, maximumFractionDigits: 2 })}`;
}

export function formatCurrency(n: number, decimals = 2): string {
  return n.toLocaleString("en-US", { minimumFractionDigits: decimals, maximumFractionDigits: decimals });
}

export function pnlClass(v: string): string {
  return parseFloat(v) >= 0 ? "pnl-positive" : "pnl-negative";
}

export function eventVolume(markets: { volume: string }[]): number {
  return markets.reduce((sum, m) => sum + parseFloat(m.volume), 0);
}

export const SELECTED_TAGS = ["sports", "finance", "pop-culture", "geopolitics", "stock-market", "tech", "politics"] as const;

export const TAG_LABELS: Record<string, string> = {
  politics: "Politics",
  elections: "Elections",
  sports: "Sports",
  finance: "Finance",
  economy: "Economy",
  tech: "Tech",
  earnings: "Earnings",
  "pop-culture": "Pop Culture",
  culture: "Culture",
  geopolitics: "Geopolitics",
  "stock-market": "Stock Market",
  "climate-science": "Climate & Science",
  world: "World",
  mentions: "Mentions",
};