const Event = require('../../models/Event');
const { registrationHref } = require('../../utils/micrositeBuild');
const { generateConciergeResponse } = require('../conciergeCall2.service');

/**
 * registration: cards-first. Return a registration link card built from the
 * event's website/registration config. Falls back to Call 2 when no link can
 * be resolved (e.g. process-only questions).
 */
module.exports = async function registrationHandler({ plan, bot, event, session, turnLog }) {
  let ev = null;
  try {
    ev = await Event.findById(bot.event).select('website settings').lean();
  } catch (err) {
    console.warn('[concierge][registration] event load failed:', err?.message || err);
  }

  const website = ev?.website || {};
  const url = ev ? registrationHref({ _id: bot.event, website }, website) : '';
  const settings = ev?.settings || {};
  const isClosed = settings.registrationOpen === false;
  const deadline = settings.registrationDeadline
    ? new Date(settings.registrationDeadline).toISOString()
    : null;

  if (url) {
    const cards = [
      {
        type: 'registration',
        data: { url, label: isClosed ? 'Registration closed' : 'Register now', open: !isClosed, deadline },
      },
    ];
    const reply = isClosed
      ? `Registration is currently closed for ${event?.name || 'this event'}.`
      : `You can register for ${event?.name || 'this event'} using the button below.`;
    return { reply, cards, usedCall2: false };
  }

  const call2 = await generateConciergeResponse({ bot, event, session, plan, turnLog });
  return { reply: call2.reply, usedCall2: true, usage: call2.usage, modelId: call2.modelId };
};