import { MetadataRoute } from 'next';
import { productService } from '../lib/services/productService';
import { PRODUCTS } from '../lib/data/products';

export default async function sitemap(): Promise<MetadataRoute.Sitemap> {
  const baseUrl = process.env.NEXT_PUBLIC_SITE_URL || 'https://canina.ir';

  // Static routes
  const staticRoutes: MetadataRoute.Sitemap = [
    {
      url: `${baseUrl}`,
      lastModified: new Date(),
      changeFrequency: 'daily',
      priority: 1,
    },
    {
      url: `${baseUrl}/shop`,
      lastModified: new Date(),
      changeFrequency: 'daily',
      priority: 0.9,
    },
    {
      url: `${baseUrl}/wiki`,
      lastModified: new Date(),
      changeFrequency: 'weekly',
      priority: 0.8,
    },
    {
      url: `${baseUrl}/blog`,
      lastModified: new Date(),
      changeFrequency: 'weekly',
      priority: 0.8,
    },
    {
      url: `${baseUrl}/search`,
      lastModified: new Date(),
      changeFrequency: 'weekly',
      priority: 0.5,
    },
    {
      url: `${baseUrl}/about`,
      lastModified: new Date(),
      changeFrequency: 'monthly',
      priority: 0.6,
    },
    {
      url: `${baseUrl}/contact`,
      lastModified: new Date(),
      changeFrequency: 'monthly',
      priority: 0.6,
    },
  ];

  // Dynamic products
  let productRoutes: MetadataRoute.Sitemap = [];
  try {
    const res = await productService.getProducts({ limit: 999 });
    const products = res.data && res.data.length > 0 ? res.data : PRODUCTS;

    productRoutes = products.map((product) => ({
      url: `${baseUrl}/shop/${product.slug || product.id}`,
      lastModified: new Date(),
      changeFrequency: 'weekly',
      priority: 0.8,
    }));
  } catch {
    productRoutes = PRODUCTS.map((product) => ({
      url: `${baseUrl}/shop/${product.slug || product.id}`,
      lastModified: new Date(),
      changeFrequency: 'weekly',
      priority: 0.8,
    }));
  }

  // Dynamic blogs
  let blogRoutes: MetadataRoute.Sitemap = [];
  try {
    const apiUrl = process.env.INTERNAL_API_URL || process.env.NEXT_PUBLIC_API_URL || 'http://localhost:4001/api';
    const apiBase = apiUrl.endsWith('/api') ? apiUrl : `${apiUrl.replace(/\/$/, '')}/api`;
    const res = await fetch(`${apiBase}/blogs?page=1&limit=999`, { next: { revalidate: 3600 } });
    if (res.ok) {
      const data = await res.json();
      const blogsList = data.data || [];
      blogRoutes = blogsList
        .filter((b: any) => !b.noIndex && b.status === 'PUBLISHED')
        .map((b: any) => ({
          url: `${baseUrl}/blog/${b.slug}`,
          lastModified: b.updatedAt ? new Date(b.updatedAt) : new Date(),
          changeFrequency: 'weekly',
          priority: b.featured ? 0.9 : 0.7,
        }));
    }
  } catch {
    // Fallback if backend not reachable at build time
    blogRoutes = [];
  }

  return [...staticRoutes, ...productRoutes, ...blogRoutes];
}