/**
 * Scheduler service using node-cron
 * Handles scheduled tasks like Formex sync
 */
import cron from 'node-cron';
import { sync as formexSync } from './formexCrawler.js';

let formexJob = null;

/**
 * Initialize the scheduler with configured jobs
 */
export function initScheduler() {
  const cronExpression = process.env.FORMEX_SYNC_CRON || '0 3 * * *'; // Default: 3:00 AM daily
  
  // Validate cron expression
  if (!cron.validate(cronExpression)) {
    console.error(`Invalid FORMEX_SYNC_CRON expression: ${cronExpression}`);
    return;
  }
  
  // Schedule Formex sync
  formexJob = cron.schedule(cronExpression, async () => {
    console.log(`[${new Date().toISOString()}] Running scheduled Formex sync...`);
    try {
      const result = await formexSync();
      console.log(`[${new Date().toISOString()}] Scheduled sync complete:`, result);
    } catch (err) {
      console.error(`[${new Date().toISOString()}] Scheduled sync failed:`, err.message);
    }
  }, {
    scheduled: true,
    timezone: 'Europe/Zurich' // Swiss timezone
  });
  
  console.log(`Formex sync scheduled: ${cronExpression} (Europe/Zurich)`);
}

/**
 * Stop all scheduled jobs
 */
export function stopScheduler() {
  if (formexJob) {
    formexJob.stop();
    formexJob = null;
    console.log('Scheduler stopped');
  }
}

/**
 * Get scheduler status
 */
export function getSchedulerStatus() {
  return {
    formexSync: {
      running: formexJob !== null,
      schedule: process.env.FORMEX_SYNC_CRON || '0 3 * * *'
    }
  };
}