import { MetadataRoute } from 'next';

export default async function sitemap(): Promise<MetadataRoute.Sitemap> {
  const baseUrl = 'https://octtoengenharia.com.br';
  const locales = ['', '/en', '/es'];
  
  // Páginas principais
  const pages = [
    { url: '', changefreq: 'weekly', priority: 1 },
    { url: '/servicos', changefreq: 'monthly', priority: 0.8 },
    { url: '/projetos', changefreq: 'weekly', priority: 0.8 },
    { url: '/contato', changefreq: 'monthly', priority: 0.7 },
    { url: '/sobre', changefreq: 'monthly', priority: 0.7 },
    { url: '/privacidade', changefreq: 'yearly', priority: 0.5 },
    { url: '/termos', changefreq: 'yearly', priority: 0.5 },
  ];

  // Buscar projetos do banco de dados
  let projects = [];
  try {
    const res = await fetch(`${baseUrl}/api/projects`, {
      next: { revalidate: 3600 }, // Cache por 1 hora
    });
    if (res.ok) {
      projects = await res.json();
    }
  } catch (error) {
    console.error('Erro ao buscar projetos para sitemap:', error);
  }

  // Gerar URLs
  const sitemap: MetadataRoute.Sitemap = [];

  // Adicionar páginas principais para cada locale
  for (const locale of locales) {
    for (const page of pages) {
      sitemap.push({
        url: `${baseUrl}${locale}${page.url}`,
        lastModified: new Date(),
        changeFrequency: page.changefreq as 'weekly' | 'monthly' | 'yearly',
        priority: page.priority,
      });
    }
  }

  // Adicionar páginas de projetos específicos
  for (const locale of locales) {
    for (const project of projects) {
      sitemap.push({
        url: `${baseUrl}${locale}/projetos/${project.id}`,
        lastModified: project.updatedAt ? new Date(project.updatedAt) : new Date(),
        changeFrequency: 'monthly' as const,
        priority: 0.6,
      });
    }
  }

  return sitemap;
}