// ============================================================================
// SEO - Meta tags dinamicas por pagina
// ============================================================================
// Uso: <SEO title="..." description="..." />
//
// Cada pagina deve usar este componente com suas proprias tags.
// O canonical e gerado automaticamente a partir da URL atual.
// ============================================================================

import { Helmet } from 'react-helmet-async';
import { useLocation } from 'react-router-dom';
import { ENV_CONFIG } from '../config/environment';

interface SEOProps {
  title?: string;
  description?: string;
  keywords?: string;
  ogImage?: string;
  ogType?: string;
  noindex?: boolean;  // Se true, forca noindex mesmo em producao
  schema?: Record<string, any>;
}

const SITE_URL = 'https://avanzato.com.br';
const DEFAULT_TITLE = 'Avanzato Tecnologia | TI Gerenciada, Cloud e Seguranca';
const DEFAULT_DESC = 'Solucoes em TI Gerenciada, Cloud Computing e Seguranca da Informacao. +23 anos de experiencia, +500 clientes atendidos. Suporte 24/7 em Guarulhos e regiao.';
const DEFAULT_OG_IMAGE = 'https://avanzato.com.br/og-image.jpg';

export default function SEO({
  title,
  description,
  keywords,
  ogImage,
  ogType = 'website',
  noindex = false,
  schema,
}: SEOProps) {
  const location = useLocation();
  const pathname = location.pathname;
  const canonicalUrl = `${SITE_URL}${pathname}`;
  const fullTitle = title ? `${title} | Avanzato` : DEFAULT_TITLE;

  return (
    <Helmet>
      {/* Title */}
      <title>{fullTitle}</title>
      <meta name="title" content={fullTitle} />

      {/* Description */}
      {description && <meta name="description" content={description} />}
      {!description && <meta name="description" content={DEFAULT_DESC} />}

      {/* Keywords */}
      {keywords && <meta name="keywords" content={keywords} />}

      {/* Canonical - DINAMICO por pagina */}
      <link rel="canonical" href={canonicalUrl} />

      {/* Robots - automatico por ambiente, override com prop noindex */}
      {noindex || !ENV_CONFIG.allowIndexing ? (
        <meta name="robots" content="noindex, nofollow" />
      ) : (
        <meta name="robots" content="index, follow" />
      )}

      {/* Open Graph */}
      <meta property="og:type" content={ogType} />
      <meta property="og:url" content={canonicalUrl} />
      <meta property="og:title" content={fullTitle} />
      <meta property="og:description" content={description || DEFAULT_DESC} />
      <meta property="og:image" content={ogImage || DEFAULT_OG_IMAGE} />
      <meta property="og:locale" content="pt_BR" />
      <meta property="og:site_name" content="Avanzato Tecnologia" />

      {/* Twitter */}
      <meta property="twitter:card" content="summary_large_image" />
      <meta property="twitter:url" content={canonicalUrl} />
      <meta property="twitter:title" content={fullTitle} />
      <meta property="twitter:description" content={description || DEFAULT_DESC} />
      <meta property="twitter:image" content={ogImage || DEFAULT_OG_IMAGE} />

      {/* Schema.org */}
      {schema && (
        <script type="application/ld+json">
          {JSON.stringify(schema)}
        </script>
      )}
    </Helmet>
  );
}

// Schema helpers
export const createServiceSchema = (name: string, description: string, urlPath: string) => ({
  '@context': 'https://schema.org',
  '@type': 'Service',
  name,
  description,
  provider: {
    '@type': 'Organization',
    name: 'Avanzato Tecnologia',
    url: SITE_URL,
  },
  url: `${SITE_URL}${urlPath}`,
  areaServed: {
    '@type': 'City',
    name: 'Guarulhos',
  },
});

export const createFAQSchema = (questions: Array<{q: string; a: string}>) => ({
  '@context': 'https://schema.org',
  '@type': 'FAQPage',
  mainEntity: questions.map(({q, a}) => ({
    '@type': 'Question',
    name: q,
    acceptedAnswer: {
      '@type': 'Answer',
      text: a,
    },
  })),
});