import dayjs from "dayjs";

export function formatNumber(n: number): string {
  return n.toLocaleString("en-US");
}

export function formatTokens(n: number): string {
  if (n >= 1_000_000_000) return `${(n / 1_000_000_000).toFixed(1)}B`;
  if (n >= 1_000_000) return `${(n / 1_000_000).toFixed(1)}M`;
  if (n >= 1_000) return `${(n / 1_000).toFixed(1)}K`;
  return String(n);
}

export function formatUSD(n: number): string {
  if (n >= 1000) return `$${n.toLocaleString("en-US", { maximumFractionDigits: 0 })}`;
  if (n >= 1) return `$${n.toFixed(2)}`;
  if (n >= 0.01) return `$${n.toFixed(3)}`;
  return `$${n.toFixed(4)}`;
}

export function formatDate(iso: string): string {
  return dayjs(iso).format("YYYY-MM-DD HH:mm:ss");
}

// 预设时间范围
export type TimeRange = "today" | "7d" | "30d" | "all" | "custom";

export function getTimeRange(range: TimeRange): { start?: number; end?: number } {
  const now = dayjs();
  switch (range) {
    case "today":
      return { start: now.startOf("day").unix(), end: now.unix() };
    case "7d":
      return { start: now.subtract(7, "day").startOf("day").unix(), end: now.unix() };
    case "30d":
      return { start: now.subtract(30, "day").startOf("day").unix(), end: now.unix() };
    case "all":
      return {};
    default:
      return {};
  }
}

export function buildQuery(
  base: string,
  params: Record<string, string | number | undefined>
): string {
  const sp = new URLSearchParams();
  for (const [k, v] of Object.entries(params)) {
    if (v !== undefined && v !== "") sp.set(k, String(v));
  }
  const qs = sp.toString();
  return qs ? `${base}?${qs}` : base;
}