import { Link } from "react-router";

import { cx, FOCUS_RING } from "./styles";
import type { NavSurface } from "./types";

/** One half of the animated brand lockup, drawn as its own SVG file. */
interface BrandMark {
  src: string;
  /** Intrinsic size of the file, for the aspect ratio the browser reserves. */
  width: number;
  height: number;
  /** The mark's own drawn width, so the pair flexes to one scale. */
  drawnWidth: number;
}

/**
 * The SHARP-ER lockup, split into its two drawn pieces so the "-ER" can slide
 * out from behind the P and fade in once the page has settled (Navigation.css).
 * Each surface ships its own export of the two pieces: white on the dark
 * surface, the two-tone ink on the light surface. Both exports of a piece are
 * the exact same box (218x46 and 112x46), so the pair shares one scale; each
 * mark takes the share of the row its box gives it, and the suffix rides flush
 * against the P's right edge.
 */
const BRAND_LOCKUP: Record<
  NavSurface,
  { base: BrandMark; suffix: BrandMark }
> = {
  light: {
    base: { src: "/assets/sharp-wordmark.svg", width: 218, height: 46, drawnWidth: 218 },
    suffix: { src: "/assets/sharp-er-suffix.svg", width: 112, height: 46, drawnWidth: 112 },
  },
  dark: {
    base: { src: "/assets/sharp-wordmark-inverse.svg", width: 218, height: 46, drawnWidth: 218 },
    suffix: { src: "/assets/sharp-er-suffix-inverse.svg", width: 112, height: 46, drawnWidth: 112 },
  },
};

export interface BrandProps {
  /** Locale-prefixed home path, e.g. "/en". */
  href: string;
  /** Accessible name of the link; the images are decorative. */
  label: string;
  surface: NavSurface;
  className?: string;
}

/** The SHARP-ER wordmark, linking home. Sits at the inline start of the bar. */
export function Brand({ href, label, surface, className }: BrandProps) {
  const { base, suffix } = BRAND_LOCKUP[surface];

  return (
    <Link
      to={href}
      aria-label={label}
      className={cx(
        "inline-flex shrink-0 items-center rounded-control",
        FOCUS_RING,
        className,
      )}
    >
      {/* `dir="ltr"` because a Latin wordmark never mirrors; its position on
          the bar still follows the page's direction. */}
      <span dir="ltr" className="flex w-[100px] items-start">
        <img
          src={base.src}
          alt=""
          width={base.width}
          height={base.height}
          loading="eager"
          decoding="async"
          draggable={false}
          style={{ flex: `${base.drawnWidth} 1 0%` }}
          className="block h-auto min-w-0"
        />

        {/* The clipping box starts at the P's right edge, so the mark inside
            it can slide out from behind the P (Navigation.css). */}
        <span
          style={{ flex: `${suffix.drawnWidth} 1 0%` }}
          className="sh-brand-suffix block min-w-0"
        >
          <img
            src={suffix.src}
            alt=""
            width={suffix.width}
            height={suffix.height}
            loading="eager"
            decoding="async"
            draggable={false}
            className="sh-brand-suffix__mark block h-auto w-full"
          />
        </span>
      </span>
    </Link>
  );
}