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

import { DESIGN_TOKENS } from "./design-tokens.generated";

/**
 * 自定义工具类的 token(字号 / 圆角 / 缓动 / 时长)要告诉 tailwind-merge 它们属于哪一组:
 * 不登记的话 `text-control text-muted-foreground` 会被当成两个颜色类冲突,字号那个被丢掉。
 * 登记表由 scripts/gen-design-tokens.mjs 从 app.css 生成,CI 校验它是最新的。
 */
const twMerge = extendTailwindMerge({
  extend: {
    theme: {
      radius: [...DESIGN_TOKENS.radii],
      ease: [...DESIGN_TOKENS.eases],
    },
    classGroups: {
      "font-size": [{ text: [...DESIGN_TOKENS.fontSizes] }],
      duration: [{ duration: [...DESIGN_TOKENS.durations] }],
    },
  },
});

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

export function formatBytes(bytes: number, decimals = 2) {
  if (!+bytes) return "0 B";
  const k = 1024;
  const dm = decimals < 0 ? 0 : decimals;
  const sizes = ["B", "KB", "MB", "GB", "TB", "PB"];
  const i = Math.min(Math.floor(Math.log(bytes) / Math.log(k)), sizes.length - 1);
  return `${Number.parseFloat((bytes / k ** i).toFixed(dm))} ${sizes[i]}`;
}

export function formatDateTime(value: string | null | undefined) {
  if (!value) return "—";
  const d = new Date(value);
  if (Number.isNaN(d.getTime())) return value;
  return d.toLocaleString("zh-CN", {
    year: "numeric",
    month: "2-digit",
    day: "2-digit",
    hour: "2-digit",
    minute: "2-digit",
    second: "2-digit",
    hour12: false,
  });
}

export function formatDate(value: string | null | undefined) {
  if (!value) return "—";
  const d = new Date(value);
  if (Number.isNaN(d.getTime())) return value;
  return d.toLocaleDateString("zh-CN", { year: "numeric", month: "2-digit", day: "2-digit" });
}