import type { MetadataRoute } from 'next'

const siteUrl = process.env.NEXT_PUBLIC_SITE_URL || 'https://trumpsignal.com'

// Settings page is user-personalized (wallet address, HL keys, alert prefs).
// Disallow under every locale prefix in case any /zh URLs survive in the wild
// — i18n is shelved but the routes still resolve.
const SETTINGS_DENY = ['/api/', '/_next/', '/en/settings', '/zh/settings']

export default function robots(): MetadataRoute.Robots {
  return {
    rules: [
      {
        userAgent: '*',
        allow: '/',
        disallow: SETTINGS_DENY,
      },
      // Explicitly allow AI crawlers (GEO — ensures ChatGPT/Perplexity/Claude index the site)
      { userAgent: 'GPTBot',        allow: '/', disallow: SETTINGS_DENY },
      { userAgent: 'ChatGPT-User',  allow: '/', disallow: SETTINGS_DENY },
      { userAgent: 'PerplexityBot', allow: '/', disallow: SETTINGS_DENY },
      { userAgent: 'ClaudeBot',     allow: '/', disallow: SETTINGS_DENY },
      { userAgent: 'anthropic-ai',  allow: '/', disallow: ['/api/', '/_next/'] },
      { userAgent: 'Googlebot',     allow: '/' },
      { userAgent: 'Bingbot',       allow: '/' },
    ],
    sitemap: `${siteUrl}/sitemap.xml`,
    host: siteUrl,
  }
}