// Returns a Next.js Metadata `icons` object derived from a Brand.
// Apps drop this into their root layout's `metadata` export to ship
// the brand logo as the favicon — fixes the "favicon 404" every
// consumer of the kit was shipping with.
//
//   import type { Metadata } from "next";
//   import { brandIcons } from "@gsc/web-kit/chrome";
//   import { brand } from "@/config/brand";
//
//   export const metadata: Metadata = {
//     title: brand.product,
//     icons: brandIcons(brand),
//   };

import type { Brand } from "./types";

interface BrandMetaIcons {
  icon: { url: string; type?: string }[];
  shortcut?: { url: string; type?: string }[];
  apple?: { url: string; type?: string }[];
}

export function brandIcons(brand: Brand): BrandMetaIcons {
  const url = brand.faviconUrl ?? brand.logoUrl;
  // Heuristic: trust the file extension to set the MIME type. Most
  // brand logos in the GoSec assets bucket are SVG.
  const type =
    /\.svg(\?|$)/i.test(url) ? "image/svg+xml" :
    /\.png(\?|$)/i.test(url) ? "image/png" :
    /\.ico(\?|$)/i.test(url) ? "image/x-icon" :
    undefined;
  return {
    icon: [{ url, ...(type ? { type } : {}) }],
    shortcut: [{ url }],
    apple: [{ url }],
  };
}