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apps/website/src/lib/seo.ts

@@ -0,0 +1,38 @@
+import { Metadata } from 'next';
+import { SUPPORTED_LOCALES } from './locales';
+
+const baseUrl = process.env.NEXT_PUBLIC_SITE_URL || 'http://localhost:3000';
+
+type SeoMetadataProps = {
+  title: string;
+  description: string;
+  path: string; // e.g. '/shop', '/category/1', or ''
+  lang: string;
+  openGraph?: Metadata['openGraph'];
+};
+
+export function generateSeoMetadata({
+  title,
+  description,
+  path,
+  lang,
+  openGraph,
+}: SeoMetadataProps): Metadata {
+  const cleanPath = path.startsWith('/') ? path : `/${path}`;
+  const pathPart = cleanPath === '/' ? '' : cleanPath;
+  
+  const languages: Record<string, string> = {};
+  SUPPORTED_LOCALES.forEach((locale) => {
+    languages[locale] = `${baseUrl}/${locale}${pathPart}`;
+  });
+
+  return {
+    title,
+    description,
+    alternates: {
+      canonical: `${baseUrl}/${lang}${pathPart}`,
+      languages,
+    },
+    openGraph,
+  };
+}