import type { MetadataRoute } from 'next';
import { i18n } from './dictionaries';
import fs from 'fs';
import path from 'path';

export default function sitemap(): MetadataRoute.Sitemap {
  const baseUrl = 'https://moygroup.com.tr';
  
  // Dynamically scan the app/[lang] folder for pages
  const langDir = path.join(process.cwd(), 'app/[lang]');
  let subfolders: string[] = [];
  
  try {
    if (fs.existsSync(langDir)) {
      subfolders = fs.readdirSync(langDir).filter((file) => {
        const filePath = path.join(langDir, file);
        if (fs.statSync(filePath).isDirectory()) {
          // Only include folders that contain a page.tsx file
          return fs.existsSync(path.join(filePath, 'page.tsx'));
        }
        return false;
      });
    }
  } catch (error) {
    console.error('Error reading directories for sitemap:', error);
  }

  // Base page paths: home page ('') + dynamic folders
  const pages = ['', ...subfolders.map((folder) => `/${folder}`)];
  
  const sitemapEntries: MetadataRoute.Sitemap = [];
  
  for (const page of pages) {
    // Generate language alternates for this page
    const alternatesLanguages: Record<string, string> = {};
    for (const locale of i18n.locales) {
      alternatesLanguages[locale] = `${baseUrl}/${locale}${page}`;
    }

    // Add entries for all locales, providing localized alternates for each
    for (const locale of i18n.locales) {
      sitemapEntries.push({
        url: `${baseUrl}/${locale}${page}`,
        lastModified: new Date(),
        changeFrequency: page === '' ? 'weekly' : 'monthly',
        priority: page === '' ? 1.0 : 0.8,
        alternates: {
          languages: alternatesLanguages,
        },
      });
    }
  }

  return sitemapEntries;
}