paseo/packages/app/src/provider-usage/format.ts

import { formatTokenCount } from "@/components/context-window-meter.utils";
import type { ProviderUsageBalanceUnit } from "./types";

export function clampPct(value: number): number {
  return Math.max(0, Math.min(100, value));
}

export function formatPct(value: number): string {
  return `${Math.round(clampPct(value))}%`;
}

function relativeDuration(iso: string): string | null {
  const diffMs = new Date(iso).getTime() - Date.now();
  if (!Number.isFinite(diffMs)) return null;
  if (diffMs <= 0) return "now";
  const diffMinutes = Math.floor(diffMs / 60_000);
  const diffHours = Math.floor(diffMinutes / 60);
  const diffDays = Math.floor(diffHours / 24);
  if (diffDays > 0) return `${diffDays}d`;
  if (diffHours > 0) return `${diffHours}h`;
  return `${diffMinutes}m`;
}

export function formatResetLabel(iso: string | null | undefined): string | null {
  if (!iso) return null;
  const rel = relativeDuration(iso);
  if (!rel) return null;
  return rel === "now" ? "resetting now" : `resets ${rel}`;
}

export function formatAgo(iso: string | null | undefined): string | null {
  if (!iso) return null;
  const diffMs = Date.now() - new Date(iso).getTime();
  if (!Number.isFinite(diffMs)) return null;
  if (diffMs < 60_000) return "just now";
  const diffMinutes = Math.floor(diffMs / 60_000);
  const diffHours = Math.floor(diffMinutes / 60);
  const diffDays = Math.floor(diffHours / 24);
  if (diffDays > 0) return `${diffDays}d ago`;
  if (diffHours > 0) return `${diffHours}h ago`;
  return `${diffMinutes}m ago`;
}

export function formatAmount(value: number, unit: ProviderUsageBalanceUnit): string {
  switch (unit) {
    case "usd":
      return `$${value.toFixed(2)}`;
    case "tokens":
      return formatTokenCount(value);
    default:
      return value.toLocaleString();
  }
}