// backend/jobs/reminderCron.js
import cron  from 'node-cron';
import pool  from '../config/mysqlPool.js';
import { sendSMS } from '../utils/smsService.js';
import { query } from '../shared/db/withEncryption.js';

const BATCH_SIZE = 25;          // tune as you like

/* Every minute */
cron.schedule('*/1 * * * *', async () => {
  try {
    /* 1️⃣ Fetch at most BATCH_SIZE reminders that are due */
    const [rows] = await pool.query(
      `SELECT id,
              phone_e164   AS toNumber,
              message_body AS body
         FROM reminders
        WHERE status      = 'pending'
          AND send_at_utc <= UTC_TIMESTAMP()
     ORDER BY send_at_utc ASC
        LIMIT ?`,
      [BATCH_SIZE]
    );

    if (!rows.length) return;   // nothing to do

    let sent = 0, failed = 0;

    /* 2️⃣ Fire off each SMS (sendSMS handles its own DB status update) */
    for (const r of rows) {
      try {
        await sendSMS({               // ← updated signature
          reminderId: r.id,
          to        : r.toNumber,
          body      : r.body
        });
        sent++;
      } catch (err) {
        console.error('[reminderCron] Twilio error:', err?.message || err);
        failed++;
        /* sendSMS already logged the failure + updated status */
      }
    }

    console.log(`[reminderCron] processed ${rows.length}: ${sent} sent, ${failed} failed`);
  } catch (err) {
    console.error('[reminderCron] DB error:', err);
  }
});