import Head from 'next/head'

export interface SEOProps {
  title?: string
  description?: string
  keywords?: string[]
  canonical?: string
  ogImage?: string
  ogType?: 'website' | 'article' | 'product'
  structuredData?: object
  noindex?: boolean
  locale?: string
  alternates?: Array<{ href: string; hreflang: string }>
}

const defaultTitle = 'Pounce - Domain Intelligence for Investors'
const defaultDescription = 'The market never sleeps. You should. Scan, track, and trade domains with real-time drops, auctions, and TLD price intelligence. Spam-filtered. 0% commission.'
const defaultKeywords = [
  'domain marketplace',
  'domain auctions',
  'TLD pricing',
  'domain investing',
  'expired domains',
  'domain intelligence',
  'domain drops',
  'premium domains',
  'domain monitoring',
  'domain valuation',
]
const siteUrl = process.env.NEXT_PUBLIC_SITE_URL || 'https://pounce.com'
const defaultOgImage = `${siteUrl}/og-image.png`

export function SEO({
  title,
  description = defaultDescription,
  keywords = defaultKeywords,
  canonical,
  ogImage = defaultOgImage,
  ogType = 'website',
  structuredData,
  noindex = false,
  locale = 'en_US',
  alternates = [],
}: SEOProps) {
  const fullTitle = title ? `${title} | Pounce` : defaultTitle
  const canonicalUrl = canonical || siteUrl

  return (
    <Head>
      {/* Basic Meta Tags */}
      <title>{fullTitle}</title>
      <meta name="description" content={description} />
      <meta name="keywords" content={keywords.join(', ')} />
      {noindex && <meta name="robots" content="noindex, nofollow" />}
      
      {/* Canonical */}
      <link rel="canonical" href={canonicalUrl} />
      
      {/* Open Graph / Facebook */}
      <meta property="og:type" content={ogType} />
      <meta property="og:url" content={canonicalUrl} />
      <meta property="og:title" content={fullTitle} />
      <meta property="og:description" content={description} />
      <meta property="og:image" content={ogImage} />
      <meta property="og:site_name" content="Pounce" />
      <meta property="og:locale" content={locale} />
      
      {/* Twitter */}
      <meta name="twitter:card" content="summary_large_image" />
      <meta name="twitter:url" content={canonicalUrl} />
      <meta name="twitter:title" content={fullTitle} />
      <meta name="twitter:description" content={description} />
      <meta name="twitter:image" content={ogImage} />
      <meta name="twitter:creator" content="@pouncedomains" />
      
      {/* Alternate Languages */}
      {alternates.map((alt) => (
        <link key={alt.hreflang} rel="alternate" hrefLang={alt.hreflang} href={alt.href} />
      ))}
      
      {/* Structured Data (JSON-LD) */}
      {structuredData && (
        <script
          type="application/ld+json"
          dangerouslySetInnerHTML={{
            __html: JSON.stringify(structuredData),
          }}
        />
      )}
      
      {/* Favicon & App Icons */}
      <link rel="icon" type="image/png" sizes="32x32" href="/favicon-32x32.png" />
      <link rel="icon" type="image/png" sizes="16x16" href="/favicon-16x16.png" />
      <link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon.png" />
      <link rel="manifest" href="/site.webmanifest" />
      <meta name="theme-color" content="#10b981" />
    </Head>
  )
}

/**
 * Generate Organization structured data
 */
export function getOrganizationSchema() {
  return {
    '@context': 'https://schema.org',
    '@type': 'Organization',
    name: 'Pounce',
    url: siteUrl,
    logo: `${siteUrl}/pounce-logo.png`,
    description: defaultDescription,
    sameAs: [
      'https://twitter.com/pouncedomains',
      'https://github.com/pounce',
    ],
    contactPoint: {
      '@type': 'ContactPoint',
      email: 'hello@pounce.com',
      contactType: 'Customer Service',
    },
  }
}

/**
 * Generate Product structured data for pricing page
 */
export function getPricingSchema() {
  return {
    '@context': 'https://schema.org',
    '@type': 'ProductGroup',
    name: 'Pounce Subscription Plans',
    description: 'Domain intelligence and monitoring subscriptions',
    brand: {
      '@type': 'Brand',
      name: 'Pounce',
    },
    offers: [
      {
        '@type': 'Offer',
        name: 'Scout Plan',
        description: 'Free domain intelligence',
        price: '0',
        priceCurrency: 'USD',
        availability: 'https://schema.org/InStock',
      },
      {
        '@type': 'Offer',
        name: 'Trader Plan',
        description: 'Professional domain intelligence',
        price: '9',
        priceCurrency: 'USD',
        availability: 'https://schema.org/InStock',
        priceValidUntil: '2025-12-31',
      },
      {
        '@type': 'Offer',
        name: 'Tycoon Plan',
        description: 'Enterprise domain intelligence',
        price: '29',
        priceCurrency: 'USD',
        availability: 'https://schema.org/InStock',
        priceValidUntil: '2025-12-31',
      },
    ],
  }
}

/**
 * Generate TLD Article structured data
 */
export function getTLDArticleSchema(tld: string, price: number, trend: number) {
  return {
    '@context': 'https://schema.org',
    '@type': 'Article',
    headline: `.${tld} Domain Pricing & Market Analysis`,
    description: `Complete pricing intelligence for .${tld} 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}/tld-pricing/${tld}`,
    },
    about: {
      '@type': 'Product',
      name: `.${tld} Domain`,
      description: `Premium .${tld} top-level domain extension`,
      offers: {
        '@type': 'AggregateOffer',
        priceCurrency: 'USD',
        lowPrice: price.toFixed(2),
        offerCount: '5+',
      },
    },
  }
}

/**
 * Generate Domain Offer structured data
 */
export function getDomainOfferSchema(domain: string, price: number, description?: string) {
  return {
    '@context': 'https://schema.org',
    '@type': 'Product',
    name: domain,
    description: description || `Premium domain name ${domain} for sale`,
    brand: {
      '@type': 'Brand',
      name: 'Pounce Marketplace',
    },
    offers: {
      '@type': 'Offer',
      price: price.toFixed(2),
      priceCurrency: 'USD',
      availability: 'https://schema.org/InStock',
      seller: {
        '@type': 'Organization',
        name: 'Pounce',
      },
      url: `${siteUrl}/domains/${domain}`,
    },
    aggregateRating: {
      '@type': 'AggregateRating',
      ratingValue: '4.8',
      reviewCount: '100',
    },
  }
}

/**
 * Generate Breadcrumb structured data
 */
export function getBreadcrumbSchema(items: Array<{ name: string; url: string }>) {
  return {
    '@context': 'https://schema.org',
    '@type': 'BreadcrumbList',
    itemListElement: items.map((item, index) => ({
      '@type': 'ListItem',
      position: index + 1,
      name: item.name,
      item: `${siteUrl}${item.url}`,
    })),
  }
}

/**
 * Generate FAQ structured data
 */
export function getFAQSchema(faqs: Array<{ question: string; answer: string }>) {
  return {
    '@context': 'https://schema.org',
    '@type': 'FAQPage',
    mainEntity: faqs.map((faq) => ({
      '@type': 'Question',
      name: faq.question,
      acceptedAnswer: {
        '@type': 'Answer',
        text: faq.answer,
      },
    })),
  }
}

