import { existsSync, mkdirSync, readFileSync, writeFileSync } from 'node:fs';
import { resolve } from 'node:path';
import { TeknavData } from '../teknav-data.js';
import { 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 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 imageUrl(path) {
  if (!path) return `${SITE_URL}/favicon.png`;
  if (path.startsWith('http')) return path;
  return `${SITE_URL}${path.startsWith('/') ? '' : '/'}${path}`;
}

const authors = TeknavData.authors ?? [];
let count = 0;

for (const author of authors) {
  const name = author.name;
  const description = truncate(author.bio || `آرشیو مقاله‌های ${name} در تکناو.`, 155);
  const avatarUrl = author.avatarUrl;
  const keywords = `${name}, نویسنده فناوری, تحلیل فناوری, تکناو`;
  
  const sameAs = author.social ? Object.values(author.social).filter(v => v && v !== '#') : [];
  if (author.alumniOf?.wikiUrl) sameAs.push(author.alumniOf.wikiUrl);
  if (author.alumniOf?.sameAs) sameAs.push(author.alumniOf.sameAs);
  if (author.alumniOf?.wikidata) sameAs.push(author.alumniOf.wikidata);

  const interactionStatistic = [];
  if (author.articleCount) {
    interactionStatistic.push({
      '@type': 'InteractionCounter',
      interactionType: 'https://schema.org/WriteAction',
      userInteractionCount: author.articleCount,
    });
  }
  const followerCount = author.followerCount || 1284;
  interactionStatistic.push({
    '@type': 'InteractionCounter',
    interactionType: 'https://schema.org/FollowAction',
    userInteractionCount: followerCount,
  });

  const person = {
    '@type': 'Person',
    name,
    url: `${SITE_URL}/author/${author.slug}`,
    jobTitle: author.specialty,
    description: author.bio,
    knowsAbout: author.expertise,
    sameAs,
    ...(avatarUrl ? { image: imageUrl(avatarUrl) } : {}),
    ...(author.username ? { alternateName: `@${author.username}` } : {}),
    interactionStatistic,
  };

  if (author.alumniOf) {
    person.alumniOf = {
      '@type': 'EducationalOrganization',
      name: author.alumniOf.name,
      url: author.alumniOf.wikiUrl || author.alumniOf.sameAs,
      sameAs: author.alumniOf.wikidata,
    };
  }

  if (author.credential) {
    person.hasCredential = [
      {
        '@type': 'EducationalOccupationalCredential',
        name: author.credential.name,
        credentialCategory: author.credential.credentialCategory || 'degree',
        recognizedBy: author.alumniOf ? {
          '@type': 'EducationalOrganization',
          name: author.alumniOf.name,
          url: author.alumniOf.wikiUrl || author.alumniOf.sameAs,
          sameAs: author.alumniOf.wikidata,
        } : undefined,
      }
    ];
  }

  // Base Organization & WebSite
  const org = {
    '@type': ['Organization', 'NewsMediaOrganization'],
    '@id': `${SITE_URL}/#organization`,
    name: 'تکناو',
    alternateName: ['Teknav', 'تکنّاو'],
    url: SITE_URL,
    logo: {
      '@type': 'ImageObject',
      '@id': `${SITE_URL}/#logo`,
      url: `${SITE_URL}/favicon.png`,
      width: 512,
      height: 512,
    },
    image: { '@id': `${SITE_URL}/#logo` },
  };

  const website = {
    '@type': 'WebSite',
    '@id': `${SITE_URL}/#website`,
    url: SITE_URL,
    name: 'تکناو',
    alternateName: 'Teknav',
    inLanguage: 'fa-IR',
    publisher: { '@id': `${SITE_URL}/#organization` },
  };

  const generatePage = (routeUrl, isProfile = false) => {
    const title = `${name} | ${isProfile ? 'پروفایل تکناو' : 'نویسنده تکناو'}`;
    const pageKeywords = isProfile ? `${name}, @${author.username}, پروفایل تکناو, نویسنده فناوری` : keywords;
    const authorArticles = (TeknavData.articles ?? [])
      .filter(article => (
        (article.authorId === author.id || article.authorName === author.name || article.authorUsername === author.username)
        && article.status === 'منتشرشده'
      ))
      .slice(0, 12);
    const jsonLd = JSON.stringify({
      '@context': 'https://schema.org',
      '@graph': [
        org,
        website,
        {
          '@type': 'ProfilePage',
          name: isProfile ? name : `${name} در تکناو`,
          url: routeUrl,
          inLanguage: 'fa-IR',
          ...(avatarUrl ? { primaryImageOfPage: imageUrl(avatarUrl) } : {}),
          mainEntity: {
            ...person,
            url: routeUrl,
          },
        },
        {
          '@type': 'BreadcrumbList',
          itemListElement: [
            { '@type': 'ListItem', position: 1, name: 'تکناو', item: SITE_URL },
            { '@type': 'ListItem', position: 2, name: isProfile ? 'نویسندگان' : 'نویسندگان تکناو', item: `${SITE_URL}/authors` },
            { '@type': 'ListItem', position: 3, name },
          ],
        },
      ],
    });

    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=")[^"]*(")/,           `$1${esc(pageKeywords)}$2`);
    html = html.replace(/(<meta name="language" content=")[^"]*(")/,           `$1fa-IR$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(routeUrl)}$2`);
    html = html.replace(/(<meta property="og:image" content=")[^"]*(")/,       `$1${esc(imageUrl(avatarUrl))}$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(imageUrl(avatarUrl))}$2`);
    html = html.replace(/(<link rel="canonical" href=")[^"]*(")/,              `$1${esc(routeUrl)}$2`);
    html = html.replace(/<link rel="alternate" hreflang="[^"]+" href="[^"]+" \/>/, `<link rel="alternate" hreflang="fa" href="${esc(routeUrl)}" />`);
    html = html.replace(/<script type="application\/ld\+json">[\s\S]*?<\/script>/,
      `<script type="application/ld+json">${jsonLd}</script>`);
    html = replaceStaticFallback(html, renderStaticFallback({
      eyebrow: isProfile ? 'پروفایل نویسنده' : 'نویسنده تکناو',
      title,
      description: author.bio || description,
      facts: [
        author.specialty ? { label: 'تخصص', value: author.specialty } : null,
        author.expertise?.length ? { label: 'حوزه‌ها', value: author.expertise.join('، ') } : null,
        author.education ? { label: 'تحصیلات', value: author.education } : null,
      ].filter(Boolean),
      links: [
        ...authorArticles.map(article => ({
          href: article.canonicalPath || `/article/${article.slug}`,
          label: article.title,
          text: article.summary,
        })),
        { href: '/authors', label: 'همه نویسندگان', text: 'آشنایی با تیم تحریریه تکناو' },
      ],
    }));
      
    return html;
  };

  // 1. Generate /author/${slug}/index.html
  const authorHtml = generatePage(`${SITE_URL}/author/${author.slug}`, false);
  const authorDir = resolve(`dist/author/${author.slug}`);
  mkdirSync(authorDir, { recursive: true });
  writeFileSync(`${authorDir}/index.html`, authorHtml, 'utf8');
  count++;

  // 2. Generate /profile/@${username}/index.html
  if (author.username) {
    const profileHtml = generatePage(`${SITE_URL}/profile/@${author.username}`, true);
    const profileDir = resolve(`dist/profile/@${author.username}`);
    mkdirSync(profileDir, { recursive: true });
    writeFileSync(`${profileDir}/index.html`, profileHtml, 'utf8');
    count++;
  }
}

console.log(`[author-pages] generated ${count} static author/profile HTML pages`);