// SPDX-License-Identifier: AGPL-3.0-only
// Copyright 2026-present the Unsloth AI Inc. team. All rights reserved. See /studio/LICENSE.AGPL-3.0

import { type ClassValue, clsx } from "clsx";
import { extendTailwindMerge } from "tailwind-merge";

// text-ui-* / leading-ui-* are the scaled typography tokens from index.css.
// Register them as font-size / line-height so twMerge does not treat
// text-ui-* as a text color and drop it when a color class follows.
const isUiToken = (value: string) => /^ui-\d+(p5)?$/.test(value);

const twMerge = extendTailwindMerge({
  extend: {
    classGroups: {
      "font-size": [{ text: [isUiToken] }],
      leading: [{ leading: [isUiToken] }],
    },
  },
});

export function cn(...inputs: ClassValue[]): string {
  return twMerge(clsx(inputs));
}

export function formatCompact(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);
}