#!/usr/bin/env node
// Generates static comparison pages at dist/compare/{slug}/index.html.
// Each page is pre-rendered for instant load and full SEO indexability.
import { mkdirSync, readFileSync, writeFileSync } from 'node:fs';
import { resolve } from 'node:path';
import { TeknavData } from '../teknav-data.js';
import { cleanText, renderStaticFallback, replaceStaticFallback } from './static-fallback.mjs';

const SITE_URL = (process.env.TEKNAV_SITE_URL || process.env.VITE_SITE_URL || 'https://www.teknav.ir').replace(/\/$/, '');

const comparisons = TeknavData.comparisons ?? [];
if (!comparisons.length) {
  console.log('[comparison-pages] no comparisons defined — skipping');
  process.exit(0);
}

const template = readFileSync(resolve('dist/index.html'), 'utf8');

function esc(value) {
  return String(value ?? '')
    .replace(/&/g, '&')
    .replace(/"/g, '"')
    .replace(/</g, '&lt;')
    .replace(/>/g, '&gt;');
}

function clean(value) {
  return String(value ?? '').replace(/<[^>]+>/g, ' ').replace(/\s+/g, ' ').trim();
}

function truncate(value, max = 155) {
  const text = clean(value);
  return text.length > max ? `${text.slice(0, max - 1).trim()}…` : text;
}

function buildPage(comparison) {
  const canonical = `${SITE_URL}/compare/${comparison.slug}`;
  const title = esc(`${comparison.title} | تکناو`);
  const description = esc(truncate(comparison.metaDescription || comparison.title, 160));
  const keywords = esc([comparison.item1.name, comparison.item2.name, 'مقایسه', ...(comparison.tags || [])].join(', '));
  const image = `${SITE_URL}/images/og/default.jpg`;
  const datePublished = comparison.dateEn || new Date().toISOString().slice(0, 10);

  // FAQ pairs from useCases + verdict
  const faqs = [
    ...(comparison.useCases || []).map(([q, a]) => ({ q: `چه زمانی از ${comparison.item1.name} استفاده کنیم؟`, a: q })).slice(0, 1),
    ...(comparison.useCases || []).map(([q, a]) => ({ q: `چه زمانی از ${comparison.item2.name} استفاده کنیم؟`, a })).slice(0, 1),
    { q: `${comparison.item1.name} بهتر است یا ${comparison.item2.name}؟`, a: comparison.verdict || '' },
  ].filter((f) => f.a);

  const jsonLd = JSON.stringify({
    '@context': 'https://schema.org',
    '@graph': [
      {
        '@type': ['Organization', 'NewsMediaOrganization'],
        '@id': `${SITE_URL}/#organization`,
        name: 'تکناو',
        url: SITE_URL,
        logo: { '@type': 'ImageObject', url: `${SITE_URL}/favicon.png` },
      },
      {
        '@type': 'WebPage',
        '@id': canonical,
        url: canonical,
        name: clean(comparison.title),
        description: clean(comparison.metaDescription || comparison.title),
        datePublished,
        inLanguage: 'fa-IR',
        publisher: { '@id': `${SITE_URL}/#organization` },
        isPartOf: { '@id': `${SITE_URL}/#website` },
      },
      {
        '@type': 'ItemList',
        name: clean(comparison.title),
        description: clean(comparison.metaDescription || comparison.title),
        numberOfItems: 2,
        itemListElement: [
          { '@type': 'ListItem', position: 1, name: comparison.item1.name, description: comparison.item1.summary, url: `${SITE_URL}/glossary/${comparison.item1.slug}` },
          { '@type': 'ListItem', position: 2, name: comparison.item2.name, description: comparison.item2.summary, url: `${SITE_URL}/glossary/${comparison.item2.slug}` },
        ],
      },
      faqs.length > 0 ? {
        '@type': 'FAQPage',
        mainEntity: faqs.map((f) => ({
          '@type': 'Question',
          name: f.q,
          acceptedAnswer: { '@type': 'Answer', text: f.a },
        })),
      } : null,
      {
        '@type': 'BreadcrumbList',
        itemListElement: [
          { '@type': 'ListItem', position: 1, name: 'تکناو', item: SITE_URL },
          { '@type': 'ListItem', position: 2, name: 'مقایسه‌ها', item: `${SITE_URL}/compare` },
          { '@type': 'ListItem', position: 3, name: clean(comparison.title) },
        ],
      },
    ].filter(Boolean),
  });

  let html = template;
  html = html.replace(/<html lang="[^"]*" dir="[^"]*">/, '<html lang="fa" dir="rtl">');
  html = html.replace(/<title>[^<]*<\/title>/, `<title>${title}</title>`);
  html = html.replace(/(<meta name="description" content=")[^"]*(")/,       `$1${description}$2`);
  html = html.replace(/(<meta name="keywords" content=")[^"]*(")/,          `$1${keywords}$2`);
  html = html.replace(/(<meta property="og:locale" content=")[^"]*(")/,     '$1fa_IR$2');
  html = html.replace(/(<meta property="og:title" content=")[^"]*(")/,      `$1${title}$2`);
  html = html.replace(/(<meta property="og:description" content=")[^"]*(")/,`$1${description}$2`);
  html = html.replace(/(<meta property="og:url" content=")[^"]*(")/,        `$1${esc(canonical)}$2`);
  html = html.replace(/(<meta property="og:image" content=")[^"]*(")/,      `$1${esc(image)}$2`);
  html = html.replace(/(<meta name="twitter:title" content=")[^"]*(")/,     `$1${title}$2`);
  html = html.replace(/(<meta name="twitter:description" content=")[^"]*(")/,`$1${description}$2`);
  html = html.replace(/(<meta name="twitter:image" content=")[^"]*(")/,     `$1${esc(image)}$2`);
  html = html.replace(/(<link rel="canonical" href=")[^"]*(")/,             `$1${esc(canonical)}$2`);
  html = html.replace(/<link rel="alternate" hreflang="[^"]+" href="[^"]+" \/>/, `<link rel="alternate" hreflang="fa" href="${esc(canonical)}" />`);
  html = html.replace(/<script type="application\/ld\+json">[\s\S]*?<\/script>/,
    `<script type="application/ld+json">${jsonLd}</script>`);
  html = replaceStaticFallback(html, renderStaticFallback({
    eyebrow: 'مقایسه فناوری',
    title: clean(comparison.title),
    description: clean(comparison.metaDescription || comparison.verdict || comparison.title),
    facts: [
      { label: comparison.item1.name, value: cleanText(comparison.item1.summary) },
      { label: comparison.item2.name, value: cleanText(comparison.item2.summary) },
      comparison.verdict ? { label: 'جمع‌بندی', value: cleanText(comparison.verdict) } : null,
    ].filter(Boolean),
    sections: [
      {
        title: 'مزایا و محدودیت‌ها',
        text: [
          `${comparison.item1.name}: ${(comparison.item1.pros || []).join('، ')}`,
          `${comparison.item2.name}: ${(comparison.item2.pros || []).join('، ')}`,
        ].join(' / '),
      },
      ...faqs.map(faq => ({ title: faq.q, text: cleanText(faq.a) })),
    ],
    links: [
      { href: '/compare', label: 'مقایسه‌ها', text: 'همه مقایسه‌های تکناو' },
      { href: '/articles', label: 'مقاله‌های فناوری', text: 'تحلیل‌های بیشتر' },
    ],
  }));

  return html;
}

let count = 0;
for (const comparison of comparisons) {
  const dir = resolve(`dist/compare/${comparison.slug}`);
  mkdirSync(dir, { recursive: true });
  writeFileSync(`${dir}/index.html`, buildPage(comparison), 'utf8');
  count++;
}

console.log(`[comparison-pages] generated ${count} comparison pages in dist/compare/`);