import { MetadataRoute } from "next";
import { getProducts, filterOutBundles } from "@/lib/saleor";
import { SUPPORTED_LOCALES, type Locale } from "@/lib/i18n/locales";

const baseUrl = process.env.NEXT_PUBLIC_SITE_URL || "https://dev.manoonoils.com";

interface SitemapEntry {
  url: string;
  lastModified: Date;
  changeFrequency: "always" | "hourly" | "daily" | "weekly" | "monthly" | "yearly" | "never";
  priority: number;
  alternates?: {
    languages?: Record<string, string>;
  };
}

export default async function sitemap(): Promise<SitemapEntry[]> {
  let products: any[] = [];
  try {
    products = await getProducts("SR", 100);
  } catch (e) {
    console.log("Failed to fetch products for sitemap during build");
  }

  const staticPages: SitemapEntry[] = [
    {
      url: baseUrl,
      lastModified: new Date(),
      changeFrequency: "daily",
      priority: 1,
      alternates: {
        languages: Object.fromEntries(
          SUPPORTED_LOCALES.map((locale) => [locale, locale === "sr" ? baseUrl : `${baseUrl}/${locale}`])
        ),
      },
    },
    {
      url: `${baseUrl}/products`,
      lastModified: new Date(),
      changeFrequency: "daily",
      priority: 0.9,
      alternates: {
        languages: Object.fromEntries(
          SUPPORTED_LOCALES.map((locale) => [locale, locale === "sr" ? `${baseUrl}/products` : `${baseUrl}/${locale}/products`])
        ),
      },
    },
    {
      url: `${baseUrl}/about`,
      lastModified: new Date(),
      changeFrequency: "monthly",
      priority: 0.6,
      alternates: {
        languages: Object.fromEntries(
          SUPPORTED_LOCALES.map((locale) => [locale, locale === "sr" ? `${baseUrl}/about` : `${baseUrl}/${locale}/about`])
        ),
      },
    },
    {
      url: `${baseUrl}/contact`,
      lastModified: new Date(),
      changeFrequency: "monthly",
      priority: 0.6,
      alternates: {
        languages: Object.fromEntries(
          SUPPORTED_LOCALES.map((locale) => [locale, locale === "sr" ? `${baseUrl}/contact` : `${baseUrl}/${locale}/contact`])
        ),
      },
    },
    {
      url: `${baseUrl}/checkout`,
      lastModified: new Date(),
      changeFrequency: "monthly",
      priority: 0.5,
      alternates: {
        languages: Object.fromEntries(
          SUPPORTED_LOCALES.map((locale) => [locale, locale === "sr" ? `${baseUrl}/checkout` : `${baseUrl}/${locale}/checkout`])
        ),
      },
    },
  ];

  const filteredProducts = filterOutBundles(products);

  const productUrls: SitemapEntry[] = [];

  for (const product of filteredProducts) {
    const hreflangs: Record<string, string> = {};
    for (const locale of SUPPORTED_LOCALES) {
      const path = locale === "sr" ? `/products/${product.slug}` : `/${locale}/products/${product.slug}`;
      hreflangs[locale] = `${baseUrl}${path}`;
    }

    for (const locale of SUPPORTED_LOCALES) {
      const localePrefix = locale === "sr" ? "" : `/${locale}`;
      productUrls.push({
        url: `${baseUrl}${localePrefix}/products/${product.slug}`,
        lastModified: new Date(),
        changeFrequency: "weekly",
        priority: 0.8,
        alternates: {
          languages: hreflangs,
        },
      });
    }
  }

  return [...staticPages, ...productUrls];
}