import type { Metadata } from "next";
import { Geist } from "next/font/google";
import "./globals.css";
import { getSettings } from "@/lib/db/settings";
import { COLOR_VARS, DEFAULT_COLORS, faviconUrl, SITE_TITLE } from "@/lib/types";
import { getDictionary, getLocale } from "@/lib/i18n";
import { listLanguages } from "@/lib/db/languages";
import { LocaleProvider } from "@/components/i18n/LocaleProvider";
import packageJson from "@/package.json";

// Farben/Logo/Favicon sollen Änderungen sofort widerspiegeln.
export const dynamic = "force-dynamic";

const geistSans = Geist({
  variable: "--font-geist-sans",
  subsets: ["latin"],
});

export async function generateMetadata(): Promise<Metadata> {
  const settings = await getSettings();

  return {
    title: SITE_TITLE,
    description: "Speisekarte der Betriebskantine",
    // Immer explizit setzen: app/favicon.ico würde sonst zusätzlich zu
    // einem eigenen Favicon eingebunden (Next.js kombiniert Datei-
    // Konvention und Metadata statt sie zu ersetzen).
    icons: { icon: faviconUrl(settings?.favicon_path) ?? "/favicon.ico" },
    // Autodiscovery für Feedreader (Browser zeigen dafür kein eigenes
    // Icon mehr an, daher zusätzlich ein sichtbares RSS-Icon im Header
    // der öffentlichen Speisekarte, s. app/page.tsx).
    alternates: {
      types: {
        "application/rss+xml": [{ url: "/feed.xml", title: `${SITE_TITLE} – Speiseplan` }],
      },
    },
  };
}

export default async function RootLayout({
  children,
}: Readonly<{
  children: React.ReactNode;
}>) {
  const [settings, locale, allLanguages] = await Promise.all([
    getSettings(),
    getLocale(),
    listLanguages(),
  ]);
  const dict = await getDictionary(locale);
  const languages = allLanguages
    .filter((l) => l.active)
    .map((l) => ({ code: l.code, label: l.label }));

  const colors: Record<string, string> = {
    ...DEFAULT_COLORS,
    ...(settings?.colors ?? {}),
  };
  const style = Object.fromEntries(
    Object.entries(COLOR_VARS).map(([key, cssVar]) => [cssVar, colors[key]])
  ) as React.CSSProperties;

  return (
    <html lang={locale} className={`${geistSans.variable} h-full antialiased`}>
      <body style={style} className="min-h-full flex flex-col">
        <LocaleProvider locale={locale} dict={dict} languages={languages}>
          {children}
        </LocaleProvider>
        <footer className="mt-auto px-4 py-2 text-right text-xs text-gray-400 select-none">
          Version {packageJson.version}
        </footer>
      </body>
    </html>
  );
}