jiang13-bbs/frontend/components/BrandLockup.tsx

import { brandLogoBox, type BrandLogoFit, type BrandLogoSize, type BrandMark } from "@/lib/brand";
import { densitySrcSet, isOwnImage, pickVariantWidth, variantURL } from "@/lib/responsiveImage";

/** 页眉品牌锁：图加文字 / 纯图 / 纯文字。图槽按画幅占位，铺法决定图怎么填进框。 */
export default function BrandLockup({
  mode,
  size = "sq",
  fit = "contain",
  name,
  wordmark = "",
  slogan = "",
  logoLight = "",
  logoDark = "",
  frame = false,
}: {
  mode: BrandMark;
  size?: BrandLogoSize;
  fit?: BrandLogoFit;
  name: string;
  wordmark?: string;
  slogan?: string;
  logoLight?: string;
  logoDark?: string;
  /** 后台预览画出画幅框，方便看非正方形占位 */
  frame?: boolean;
}) {
  const label = wordmark.trim() || name;
  const line = slogan.trim();
  const showImage = mode !== "text";
  const showText = mode !== "image";
  const box = brandLogoBox(size);
  // auto 图槽宽度随图（可达最宽画幅量级），按 176 取密度变体保证清晰
  const cssPx = size === "auto" ? 176 : Math.max(box.w, box.h);
  const src = logoLight || logoDark;
  const both = !!(logoLight && logoDark && logoLight !== logoDark);
  const useBox = showImage && (!!src || frame);

  return (
    <span className="j13-brand-lockup inline-flex items-center gap-2.5 min-w-0">
      {showImage ? (
        useBox ? (
          <span
            className="j13-brand-slot"
            data-frame={frame ? "1" : undefined}
            data-fit={src ? fit : undefined}
            data-size={size}
            style={{ width: box.w || undefined, height: box.h }}
          >
            {src ? (
              both ? (
                <>
                  <Logo src={logoLight} fit={fit} alt={label} decorative={showText} extra="j13-brand-logo-light" cssPx={cssPx} />
                  <Logo src={logoDark} fit={fit} alt={label} decorative={showText} extra="j13-brand-logo-dark" cssPx={cssPx} />
                </>
              ) : (
                <Logo src={src} fit={fit} alt={label} decorative={showText} cssPx={cssPx} />
              )
            ) : (
              <Bubble h={box.h} label={showText ? undefined : label} />
            )}
          </span>
        ) : (
          <Bubble h={36} label={showText ? undefined : label} />
        )
      ) : null}
      {showText ? (
        <span className="leading-none min-w-0">
          <span className="block font-extrabold text-[17px] tracking-tight truncate" style={{ color: "var(--ink)" }}>
            {label}
          </span>
          {line ? (
            <span className="block text-[10.5px] mt-0.5 truncate" style={{ color: "var(--ink-3)" }}>
              {line}
            </span>
          ) : null}
        </span>
      ) : null}
    </span>
  );
}

function Logo({
  src,
  fit,
  alt,
  decorative = false,
  extra = "",
  cssPx,
}: {
  src: string;
  fit: BrandLogoFit;
  alt: string;
  /** 旁边已有站名时，读屏跳过，HTML 仍保留 alt 供检索 */
  decorative?: boolean;
  extra?: string;
  /** 图槽最大边 CSS px，用于密度变体 */
  cssPx: number;
}) {
  if (fit === "repeat") {
    return (
      <span
        role={decorative ? undefined : "img"}
        aria-hidden={decorative || undefined}
        aria-label={decorative ? undefined : alt}
        className={`j13-brand-logo j13-brand-logo-tile ${extra}`}
        style={{ backgroundImage: `url("${src.replace(/["\\\n\r]/g, "")}")` }}
      />
    );
  }
  // 本站光栅图走 1x/2x 变体（SVG/ICO 后端透传）；外链图保持原地址
  const own = isOwnImage(src);
  return (
    /* eslint-disable-next-line @next/next/no-img-element */
    <img
      src={own ? variantURL(src, pickVariantWidth(cssPx)) : src}
      srcSet={own ? densitySrcSet(src, cssPx) : undefined}
      alt={alt}
      aria-hidden={decorative || undefined}
      className={`j13-brand-logo ${extra}`}
    />
  );
}

function Bubble({ h, label }: { h: number; label?: string }) {
  return (
    <span
      role={label ? "img" : undefined}
      aria-label={label}
      aria-hidden={label ? undefined : true}
      className="j13-brand-bubble rounded-2xl flex items-center justify-center shrink-0 transition-transform duration-300 group-hover:rotate-[-6deg]"
      style={{ width: h, height: h, background: "var(--accent)", color: "var(--accent-on)" }}
    >
      <svg aria-hidden="true" focusable="false" width="50%" height="50%" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2.2" strokeLinecap="round" strokeLinejoin="round">
        <path d="M21 11.5a8.38 8.38 0 0 1-.9 3.8 8.5 8.5 0 0 1-7.6 4.7 8.38 8.38 0 0 1-3.8-.9L3 21l1.9-5.7a8.38 8.38 0 0 1-.9-3.8 8.5 8.5 0 0 1 4.7-7.6 8.38 8.38 0 0 1 3.8-.9h.5a8.48 8.48 0 0 1 8 8v.5z" />
      </svg>
    </span>
  );
}