import React from "react";
import { cn } from "@/lib/utils";

const YANG = "fill-stone-100 dark:fill-stone-200";
const YIN = "fill-stone-800 dark:fill-stone-900";

/** 太极阴阳鱼图标（页眉 Logo） */
export const TaijiIcon = React.memo(function TaijiIcon({
  className,
}: {
  className?: string;
}) {
  return (
    <svg
      viewBox="0 0 64 64"
      xmlns="http://www.w3.org/2000/svg"
      className={cn("h-7 w-7 shrink-0 drop-shadow-sm", className)}
      aria-hidden
    >
      <circle cx="32" cy="32" r="30" className={YANG} />
      <path
        d="M32 2a30 30 0 0 1 0 60 15 15 0 0 1 0-30 15 15 0 0 0 0-30z"
        className={YIN}
      />
      <circle cx="32" cy="17" r="5" className={YANG} />
      <circle cx="32" cy="47" r="5" className={YIN} />
    </svg>
  );
});

/** 背景用水印版太极 */
export function TaijiWatermark({
  className,
}: {
  className?: string;
}) {
  return (
    <svg
      viewBox="0 0 200 200"
      xmlns="http://www.w3.org/2000/svg"
      className={className}
      aria-hidden
    >
      <circle cx="100" cy="100" r="98" className={`${YANG} opacity-[0.35]`} />
      <path
        d="M100 2a98 98 0 0 1 0 196 49 49 0 0 1 0-98 49 49 0 0 0 0-98z"
        className={`${YIN} opacity-[0.08] dark:opacity-[0.12]`}
      />
      <circle cx="100" cy="51" r="10" className={`${YANG} opacity-50`} />
      <circle cx="100" cy="149" r="10" className={`${YIN} opacity-20 dark:opacity-30`} />
    </svg>
  );
}