import type { Lang } from "./i18n";

export const localizedHomeRoutes: ReadonlyArray<{ lang: Lang; path: string }> =
  [
    { lang: "zh-CN", path: "/chinese" },
    { lang: "ja", path: "/japanese" },
    { lang: "ko", path: "/korean" },
    { lang: "vi", path: "/vietnamese" },
    { lang: "id", path: "/indonesian" },
    { lang: "ms", path: "/malay" },
  ];

function normalizePathname(pathname: string): string {
  const normalized = pathname.replace(/\/+$/, "");
  return normalized || "/";
}

export function languageForHomePathname(pathname: string): Lang | null {
  const normalized = normalizePathname(pathname);
  return (
    localizedHomeRoutes.find((route) => route.path === normalized)?.lang ?? null
  );
}

export function isHomePathname(pathname: string): boolean {
  return (
    normalizePathname(pathname) === "/" ||
    languageForHomePathname(pathname) !== null
  );
}

export function homePathForLang(lang: Lang): string {
  if (lang === "en") return "/";
  return localizedHomeRoutes.find((route) => route.lang === lang)?.path ?? "/";
}