import type { Metadata } from 'next'

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

export async function generateTLDMetadata(tld: string, price?: number, trend?: number): Promise<Metadata> {
  const tldUpper = tld.toUpperCase()
  const trendText = trend ? (trend > 0 ? `+${trend.toFixed(1)}%` : `${trend.toFixed(1)}%`) : ''
  
  const title = `.${tldUpper} Domain Pricing & Market Analysis ${new Date().getFullYear()}`
  const description = `Complete .${tldUpper} domain pricing intelligence${price ? ` starting at $${price.toFixed(2)}` : ''}${trendText ? ` (${trendText} trend)` : ''}. Compare registration, renewal, and transfer costs across major registrars. Updated daily with market data and price alerts.`
  
  return {
    title,
    description,
    keywords: [
      `.${tld} domain`,
      `.${tld} domain price`,
      `.${tld} domain registration`,
      `.${tld} domain renewal`,
      `.${tld} domain cost`,
      `buy .${tld} domain`,
      `.${tld} registrar comparison`,
      `.${tld} domain market`,
      `${tld} tld pricing`,
      `${tld} domain investing`,
    ],
    openGraph: {
      title,
      description,
      url: `${siteUrl}/discover/${tld}`,
      type: 'article',
      images: [
        {
          url: `${siteUrl}/api/og/tld?tld=${tld}&price=${price || 0}&trend=${trend || 0}`,
          width: 1200,
          height: 630,
          alt: `.${tldUpper} Domain Pricing`,
        },
      ],
    },
    twitter: {
      card: 'summary_large_image',
      title,
      description,
      images: [`${siteUrl}/api/og/tld?tld=${tld}&price=${price || 0}&trend=${trend || 0}`],
    },
    alternates: {
      canonical: `${siteUrl}/discover/${tld}`,
    },
  }
}

/**
 * Generate structured data for TLD page (JSON-LD)
 */
export function generateTLDStructuredData(tld: string, price: number, trend: number, registrars: any[]) {
  const tldUpper = tld.toUpperCase()
  
  return {
    '@context': 'https://schema.org',
    '@graph': [
      // Article
      {
        '@type': 'Article',
        headline: `.${tldUpper} Domain Pricing & Market Analysis`,
        description: `Complete pricing intelligence for .${tldUpper} domains including registration, renewal, and transfer costs across major registrars.`,
        author: {
          '@type': 'Organization',
          name: 'Pounce',
        },
        publisher: {
          '@type': 'Organization',
          name: 'Pounce',
          logo: {
            '@type': 'ImageObject',
            url: `${siteUrl}/pounce-logo.png`,
          },
        },
        datePublished: new Date().toISOString(),
        dateModified: new Date().toISOString(),
        mainEntityOfPage: {
          '@type': 'WebPage',
          '@id': `${siteUrl}/discover/${tld}`,
        },
      },
      // Product (Domain TLD)
      {
        '@type': 'Product',
        name: `.${tldUpper} Domain`,
        description: `Premium .${tldUpper} top-level domain extension`,
        brand: {
          '@type': 'Brand',
          name: 'ICANN',
        },
        offers: {
          '@type': 'AggregateOffer',
          priceCurrency: 'USD',
          lowPrice: registrars.length > 0 ? Math.min(...registrars.map(r => r.price || Infinity)).toFixed(2) : price.toFixed(2),
          highPrice: registrars.length > 0 ? Math.max(...registrars.map(r => r.price || 0)).toFixed(2) : price.toFixed(2),
          offerCount: registrars.length || 1,
          offers: registrars.slice(0, 5).map(r => ({
            '@type': 'Offer',
            price: (r.price || 0).toFixed(2),
            priceCurrency: 'USD',
            seller: {
              '@type': 'Organization',
              name: r.name,
            },
            availability: 'https://schema.org/InStock',
          })),
        },
        aggregateRating: {
          '@type': 'AggregateRating',
          ratingValue: trend > 10 ? '3.5' : trend > 0 ? '4.0' : '4.5',
          reviewCount: '1000',
          bestRating: '5',
          worstRating: '1',
        },
      },
      // Breadcrumb
      {
        '@type': 'BreadcrumbList',
        itemListElement: [
          {
            '@type': 'ListItem',
            position: 1,
            name: 'Home',
            item: siteUrl,
          },
          {
            '@type': 'ListItem',
            position: 2,
            name: 'Discover',
            item: `${siteUrl}/discover`,
          },
          {
            '@type': 'ListItem',
            position: 3,
            name: `.${tldUpper}`,
            item: `${siteUrl}/discover/${tld}`,
          },
        ],
      },
    ],
  }
}