const ConciergeBot = require('../models/ConciergeBot');
const Event = require('../models/Event');
const WhatsAppChatSession = require('../models/WhatsAppChatSession');
const { getOrgWhatsAppCredentials } = require('../utils/whatsappCloud');
const { handleFirstInbound, handleUnlinkedMessage } = require('./whatsappReception.service');
const { handleFollowup, inboundText } = require('./whatsappFollowup.service');
const { logWhatsApp, maskPhone } = require('../utils/whatsappLog');

async function findReceptionBotByPhoneNumberId(phoneNumberId) {
  const pid = String(phoneNumberId || '').trim();
  if (!pid) {
    logWhatsApp('inbound.no_phone_id', {});
    return null;
  }
  // Match on reception.enabled only. Status ARCHIVED is a knowledge-purge
  // marker (ended events) and must not block a reception desk that is still on.
  const bots = await ConciergeBot.find({ 'reception.enabled': true })
    .setOptions({ strictQuery: false })
    .lean();
  logWhatsApp('inbound.reception_bots', {
    incomingPhoneNumberId: pid,
    count: bots.length,
    bots: bots.map((b) => ({
      botId: String(b._id),
      name: b.name || '',
      status: b.status || '',
    })),
  });
  for (const bot of bots) {
    const creds = await getOrgWhatsAppCredentials(String(bot.organization));
    const orgPid = creds ? String(creds.phoneNumberId || '').trim() : '';
    logWhatsApp('inbound.bot_check', {
      botId: String(bot._id),
      botName: bot.name || '',
      status: bot.status || '',
      orgPhoneNumberId: orgPid || '(none)',
      match: Boolean(creds && orgPid === pid),
    });
    if (creds && orgPid === pid) return bot;
  }
  return null;
}

async function processInboundMessage(jobData) {
  const { phoneId, messageData, profileName } = jobData || {};
  if (!messageData) {
    logWhatsApp('inbound.skip', { reason: 'no_message' });
    return;
  }

  const bot = await findReceptionBotByPhoneNumberId(phoneId);
  if (!bot) {
    logWhatsApp('inbound.skip', {
      reason: 'no_reception_bot',
      phoneNumberId: String(phoneId || ''),
    });
    return;
  }

  const eventId = bot.event;
  const event = await Event.findById(eventId).select('name location locationType startDate endDate').lean();
  const eventName = event?.name || 'Event';
  const userPhone = String(messageData.from || '').replace(/\D/g, '');
  if (!userPhone) {
    logWhatsApp('inbound.skip', { reason: 'no_from', botId: String(bot._id) });
    return;
  }

  logWhatsApp('inbound.process', {
    botId: String(bot._id),
    eventName,
    from: maskPhone(userPhone),
    type: messageData.type || '',
    profileName: profileName || '',
    dripCount: Array.isArray(bot.reception?.drips) ? bot.reception.drips.length : 0,
    dripAudience: bot.reception?.dripAudience || 'matched',
  });

  let session = await WhatsAppChatSession.findOne({ botId: bot._id, phoneNumber: userPhone });
  if (!session) {
    try {
      session = await WhatsAppChatSession.create({
        botId: bot._id,
        eventId,
        organization: bot.organization,
        phoneNumber: userPhone,
        waProfileName: profileName || '',
        receptionState: 'IDENTIFYING',
        history: [],
        lastSeenAt: new Date(),
      });
    } catch (err) {
      if (err && err.code === 11000) {
        session = await WhatsAppChatSession.findOne({ botId: bot._id, phoneNumber: userPhone });
      } else {
        throw err;
      }
    }
    if (!session) return;
  }
  session.lastSeenAt = new Date();

  const isFirst = !session.firstInboundAt;
  logWhatsApp('inbound.session', {
    sessionId: String(session._id),
    first: isFirst,
    receptionState: session.receptionState,
    hasParticipant: Boolean(session.participant),
  });
  if (isFirst) {
    await handleFirstInbound(bot, session, {
      profileName: profileName || session.waProfileName,
      eventId,
      eventName,
      messageData,
    });
    return;
  }

  // Drips are queued at first inbound / match. If the organiser added them later,
  // pick them up on the next message (deduped) so a 1-minute test can still fire.
  if (!(session.dripJobIds || []).length) {
    const audience = bot.reception?.dripAudience === 'all_inbound' ? 'all_inbound' : 'matched';
    if (session.participant || audience === 'all_inbound') {
      const { scheduleDripsForSession } = require('./whatsappDrip.service');
      await scheduleDripsForSession(session, bot, {
        phase: session.participant ? 'match' : 'first_inbound',
      });
    }
  }

  if (session.receptionState !== 'ONBOARDED' || !session.participant) {
    await handleUnlinkedMessage(bot, session, { messageData, eventId, eventName });
    return;
  }

  await handleFollowup({ bot, event, session, messageData });
}

module.exports = {
  processInboundMessage,
  findReceptionBotByPhoneNumberId,
  inboundText,
};