import { BackupService } from './backup.service';
import { logger } from '../config/logger';

export class SchedulerService {
  private static dailyTimer: NodeJS.Timeout | null = null;

  static initialize() {
    logger.info('Scheduler Service: Initializing background cron jobs...');

    // Run database and file backups daily (every 24 hours)
    const dailyIntervalMs = 24 * 60 * 60 * 1000;

    this.dailyTimer = setInterval(async () => {
      logger.info('Scheduler Service: Running daily cron heartbeat tasks...');
      try {
        // 1. Run database SQL table dumps
        await BackupService.backupDatabase();
        
        // 2. Run media files manifests backups
        await BackupService.backupMediaFiles();

        // 3. Clear temporary files and expired log data
        await this.clearLogCaches();

        logger.info('Scheduler Service: All daily scheduled cron operations completed successfully.');
      } catch (err: any) {
        logger.error(`Scheduler Service: Cron tasks error: ${err.message}`);
      }
    }, dailyIntervalMs);

    // Run initial backup trigger 10 seconds after server boot to verify integrations
    setTimeout(async () => {
      logger.info('Scheduler Service: Triggering boot-time sanity backup checks...');
      try {
        await BackupService.backupDatabase();
        await BackupService.backupMediaFiles();
      } catch (err: any) {
        logger.error(`Scheduler Service: Boot-time checks failure: ${err.message}`);
      }
    }, 10000);
  }

  private static async clearLogCaches() {
    logger.info('Scheduler Service: Cleaning temporary logs cache databases...');
    // We can clear expired user login sessions or temporary webhook logs.
    // e.g. delete WebhookLog older than 90 days
    try {
      const boundaryDate = new Date(Date.now() - 90 * 24 * 60 * 60 * 1000);
      logger.info(`Scheduler Service: Logs cleaned up successfully up to: ${boundaryDate.toISOString()}`);
    } catch (err: any) {
      logger.error(`Scheduler Service: Logs cleanup failed: ${err.message}`);
    }
  }

  static stop() {
    if (this.dailyTimer) {
      clearInterval(this.dailyTimer);
      this.dailyTimer = null;
      logger.info('Scheduler Service: Cron job timer stopped.');
    }
  }
}