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apps/website/src/app/sitemap.ts

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+import { MetadataRoute } from 'next';
+import { getCategories, getProducts, getArticlesResult } from '../lib/cms';
+
+const baseUrl = process.env.NEXT_PUBLIC_SITE_URL || 'http://localhost:3000';
+
+const languages = ['th', 'en', 'ja', 'zh', 'vi', 'ko'];
+
+function createAlternates(path: string) {
+  const alternates: Record<string, string> = {};
+  for (const lang of languages) {
+    alternates[lang] = `${baseUrl}/${lang}${path}`;
+  }
+  return alternates;
+}
+
+export default async function sitemap(): Promise<MetadataRoute.Sitemap> {
+  const [categories, products, articlesResult] = await Promise.all([
+    getCategories(),
+    getProducts('limit=1000'),
+    getArticlesResult(),
+  ]);
+
+  const staticPages = [
+    '',
+    '/shop',
+    '/scent-guide',
+    '/about',
+    '/contact',
+    '/faq',
+  ];
+
+  const routes: MetadataRoute.Sitemap = staticPages.map((route) => ({
+    url: `${baseUrl}/th${route}`,
+    lastModified: new Date(),
+    changeFrequency: 'daily',
+    priority: route === '' ? 1 : 0.8,
+    alternates: {
+      languages: createAlternates(route),
+    },
+  }));
+
+  const categoryRoutes: MetadataRoute.Sitemap = categories.map((category) => ({
+    url: `${baseUrl}/th/category/${category.id}`,
+    lastModified: new Date(),
+    changeFrequency: 'weekly',
+    priority: 0.7,
+    alternates: {
+      languages: createAlternates(`/category/${category.id}`),
+    },
+  }));
+
+  const productRoutes: MetadataRoute.Sitemap = products.map((product) => ({
+    url: `${baseUrl}/th/products/${product.id}`,
+    lastModified: new Date(),
+    changeFrequency: 'daily',
+    priority: 0.9,
+    alternates: {
+      languages: createAlternates(`/products/${product.id}`),
+    },
+  }));
+
+  const articleRoutes: MetadataRoute.Sitemap = [];
+  if (articlesResult.ok && articlesResult.data) {
+    articlesResult.data.forEach((article) => {
+      articleRoutes.push({
+        url: `${baseUrl}/th/article/${article.slug}`,
+        lastModified: new Date(article.updatedAt || article.createdAt),
+        changeFrequency: 'monthly',
+        priority: 0.6,
+        alternates: {
+          languages: createAlternates(`/article/${article.slug}`),
+        },
+      });
+    });
+  }
+
+  return [...routes, ...categoryRoutes, ...productRoutes, ...articleRoutes];
+}