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

/**
 * Groupes de pages traduites.
 * Chaque groupe contient les URLs correspondantes pour chaque langue.
 */
const translationGroups: Record<Locale, string>[] = [
	{ fr: "/", en: "/en", ar: "/ar" },
	{ fr: "/a-propos", en: "/en/about", ar: "/ar/نبذة-عني" },
	{ fr: "/code", en: "/en/code", ar: "/ar/برمجة" },
	{ fr: "/theatre", en: "/en/acting", ar: "/ar/مسرح" },
	{ fr: "/photo", en: "/en/photo", ar: "/ar/تصوير" },
];

/** Index inversé : pathname → groupe de traduction */
const pathIndex = new Map<string, Record<Locale, string>>();
for (const group of translationGroups) {
	for (const path of Object.values(group)) {
		pathIndex.set(path, group);
	}
}

/**
 * Retourne les URLs alternatives pour un pathname donné.
 * Les trailing slashes sont normalisés.
 */
export function getAlternateUrls(
	pathname: string,
): Record<Locale, string> | undefined {
	const normalized = pathname.replace(/\/$/, "") || "/";
	return pathIndex.get(normalized);
}