/**
 * Copy legacy `Event.website` microsite configuration into a default `EventMicrosite` row per event.
 * Sets `sourcePageId` to the event's Website Builder `home` page when present.
 *
 * Run: cd backend && node scripts/migrate-event-website-to-microsites.js
 */
const path = require('path');

require('dotenv').config({ path: path.join(__dirname, '..', '.env') });
const mongoose = require('mongoose');
const Event = require(path.join(__dirname, '..', 'src', 'models', 'Event'));
const EventPage = require(path.join(__dirname, '..', 'src', 'models', 'EventPage'));
const EventMicrosite = require(path.join(__dirname, '..', 'src', 'models', 'EventMicrosite'));
const User = require(path.join(__dirname, '..', 'src', 'models', 'User'));

function normalizeFolder(raw) {
  return String(raw || '')
    .trim()
    .toLowerCase()
    .replace(/[^a-z0-9-]/g, '');
}

function registrationFormObjectId(raw) {
  if (raw == null || raw === '') return undefined;
  const s = String(raw).trim();
  if (!mongoose.Types.ObjectId.isValid(s)) return undefined;
  return new mongoose.Types.ObjectId(s);
}

function websiteHasMicrositeContent(w) {
  if (!w || typeof w !== 'object') return false;
  if (normalizeFolder(w.folder)) return true;
  if (w.enabled === true) return true;
  if (typeof w.micrositeHtml === 'string' && w.micrositeHtml.trim()) return true;
  if (Array.isArray(w.micrositeSections) && w.micrositeSections.length > 0) return true;
  if (w.registrationFormId != null && String(w.registrationFormId).trim()) return true;
  if (typeof w.title === 'string' && w.title.trim()) return true;
  if (typeof w.logo === 'string' && w.logo.trim()) return true;
  if (Array.isArray(w.banners) && w.banners.some(Boolean)) return true;
  if (typeof w.primaryColor === 'string' && w.primaryColor.trim()) return true;
  return false;
}

async function pickCreatedBy(organizationId) {
  const u = await User.findOne({ organization: organizationId }).sort({ createdAt: 1 }).select('_id').lean();
  return u?._id || null;
}

async function uniquePublishFolder(base) {
  let candidate = base || 'microsite';
  let n = 0;
  // eslint-disable-next-line no-await-in-loop
  while (await EventMicrosite.findOne({ publishFolder: candidate }).select('_id').lean()) {
    n += 1;
    candidate = `${base || 'microsite'}-${n}`;
  }
  return candidate;
}

async function run() {
  const uri = process.env.MONGODB_URI;
  if (!uri) {
    console.error('MONGODB_URI is not set');
    process.exit(1);
  }
  await mongoose.connect(uri);

  const events = await Event.find({}).lean();
  let created = 0;
  let skipped = 0;

  for (const ev of events) {
    const w = ev.website;
    if (!websiteHasMicrositeContent(w)) {
      skipped += 1;
      continue;
    }
    // eslint-disable-next-line no-await-in-loop
    const existing = await EventMicrosite.countDocuments({ event: ev._id });
    if (existing > 0) {
      skipped += 1;
      continue;
    }

    // eslint-disable-next-line no-await-in-loop
    const createdBy = await pickCreatedBy(ev.organization);
    if (!createdBy) {
      console.warn(`Event ${ev._id}: no user found for organization — skipped`);
      skipped += 1;
      continue;
    }

    let publishFolder = normalizeFolder(w.folder);
    if (!publishFolder) {
      publishFolder = await uniquePublishFolder(`e${String(ev._id).slice(-8)}`);
    } else {
      // eslint-disable-next-line no-await-in-loop
      publishFolder = await uniquePublishFolder(publishFolder);
    }

    // eslint-disable-next-line no-await-in-loop
    const home = await EventPage.findOne({ event: ev._id, type: 'home' }).select('_id').lean();

    const doc = new EventMicrosite({
      event: ev._id,
      name: 'Default',
      publishFolder,
      enabled: !!w.enabled,
      logo: w.logo,
      banners: Array.isArray(w.banners) ? w.banners : [],
      favicon: w.favicon,
      title: w.title,
      seoDescription: w.seoDescription,
      description: w.description,
      keywords: Array.isArray(w.keywords) ? w.keywords : [],
      templateId: w.templateId,
      layoutTemplate: w.layoutTemplate || 'conference',
      micrositeSections: Array.isArray(w.micrositeSections) ? w.micrositeSections : [],
      primaryColor: w.primaryColor,
      accentColor: w.accentColor,
      fontPair: w.fontPair,
      registrationUrl: w.registrationUrl,
      registrationFormId: registrationFormObjectId(w.registrationFormId),
      micrositeHtml: w.micrositeHtml,
      sourcePageId: home?._id,
      createdBy,
    });

    try {
      // eslint-disable-next-line no-await-in-loop
      await doc.save();
      created += 1;
      console.log(`Created EventMicrosite ${doc._id} for event ${ev._id} (folder=${publishFolder})`);
    } catch (e) {
      console.error(`Event ${ev._id}: save failed`, e.message || e);
    }
  }

  console.log(`Done. Created ${created} microsite template(s), skipped ${skipped} event row(s) (no content or already had templates).`);
  await mongoose.disconnect();
}

run().catch((e) => {
  console.error(e);
  process.exit(1);
});