// /jobs/paymentReminderJob.js

const cron = require('node-cron');
const Payment = require('../components/payments/paymentModel');
const eventEmitter = require('../events/eventEmitter');
const EVENT_NAMES = require('../constants/eventNames');
const logger = require('../utils/logger');

const runPaymentReminderJob = async () => {
  try {
    const now = new Date();
    const threeDaysFromNow = new Date();
    threeDaysFromNow.setDate(now.getDate() + 3);

    // Find pending/partiallyPaid payments due in the next 3 days
    const upcomingPayments = await Payment.find({
      status: { $in: ['pending', 'partiallyPaid'] },
      dueDate: { $gte: now, $lte: threeDaysFromNow }
    }).populate('user');

    for (const payment of upcomingPayments) {
      if (payment.user) {
        eventEmitter.emit(EVENT_NAMES.PAYMENT_REMINDER_DUE, {
          paymentId: payment._id,
          userId: payment.user._id,
          amountDue: payment.amount - payment.amountPaid,
          dueDate: payment.dueDate
        });
      }
    }

    // Find overdue payments and update status to overdue
    const overduePayments = await Payment.find({
      status: { $in: ['pending', 'partiallyPaid'] },
      dueDate: { $lt: now }
    });

    for (const payment of overduePayments) {
      payment.status = 'overdue';
      await payment.save();
      if (payment.user) {
        eventEmitter.emit(EVENT_NAMES.PAYMENT_STATUS_CHANGED, {
          paymentId: payment._id,
          userId: payment.user,
          oldStatus: 'pending',
          newStatus: 'overdue'
        });
      }
    }
  } catch (error) {
    logger.error(`[PaymentReminderJob ERROR]: ${error.message}`);
  }
};

const startPaymentReminderJob = () => {
  // Run daily at midnight
  cron.schedule('0 0 * * *', async () => {
    await runPaymentReminderJob();
  });
  logger.info('[PaymentReminderJob] Scheduled to run daily at midnight.');
};

module.exports = {
  startPaymentReminderJob,
  runPaymentReminderJob
};