/**
 * @ai-summary Centralized cron job scheduler
 * @ai-context Uses node-cron for scheduling background tasks
 */

import cron from 'node-cron';
import { logger } from '../logging/logger';
import { processScheduledNotifications } from '../../features/notifications/jobs/notification-processor.job';
import { processAccountPurges } from '../../features/user-profile/jobs/account-purge.job';
import {
  processScheduledBackups,
  setBackupJobPool,
} from '../../features/backup/jobs/backup-scheduled.job';
import {
  processBackupRetention,
  setBackupCleanupJobPool,
} from '../../features/backup/jobs/backup-cleanup.job';
import {
  processAuditLogCleanup,
  setAuditLogCleanupJobPool,
} from '../../features/audit-log/jobs/cleanup.job';
import {
  processGracePeriodExpirations,
  setGracePeriodJobPool,
} from '../../features/subscriptions/jobs/grace-period.job';
import { pool } from '../config/database';

let schedulerInitialized = false;

export function initializeScheduler(): void {
  if (schedulerInitialized) {
    logger.warn('Scheduler already initialized, skipping');
    return;
  }

  logger.info('Initializing cron scheduler');

  // Initialize backup job pools
  setBackupJobPool(pool);
  setBackupCleanupJobPool(pool);

  // Initialize audit log cleanup job pool
  setAuditLogCleanupJobPool(pool);

  // Initialize grace period job pool
  setGracePeriodJobPool(pool);

  // Daily notification processing at 8 AM
  cron.schedule('0 8 * * *', async () => {
    logger.info('Running scheduled notification job');
    try {
      await processScheduledNotifications();
    } catch (error) {
      logger.error('Scheduled notification job failed', {
        error: error instanceof Error ? error.message : String(error)
      });
    }
  });

  // Daily account purge job at 2 AM (GDPR compliance - 30-day grace period)
  cron.schedule('0 2 * * *', async () => {
    logger.info('Running account purge job');
    try {
      const result = await processAccountPurges();
      logger.info('Account purge job completed successfully', {
        processed: result.processed,
        deleted: result.deleted,
        errors: result.errors.length,
      });
    } catch (error) {
      logger.error('Account purge job failed', {
        error: error instanceof Error ? error.message : String(error)
      });
    }
  });

  // Grace period expiration check at 2:30 AM daily
  cron.schedule('30 2 * * *', async () => {
    logger.info('Running grace period expiration job');
    try {
      const result = await processGracePeriodExpirations();
      logger.info('Grace period job completed', {
        processed: result.processed,
        downgraded: result.downgraded,
        errors: result.errors.length,
      });
    } catch (error) {
      logger.error('Grace period job failed', {
        error: error instanceof Error ? error.message : String(error)
      });
    }
  });

  // Check for scheduled backups every minute
  cron.schedule('* * * * *', async () => {
    logger.debug('Checking for scheduled backups');
    try {
      await processScheduledBackups();
    } catch (error) {
      logger.error('Scheduled backup check failed', {
        error: error instanceof Error ? error.message : String(error)
      });
    }
  });

  // Backup retention cleanup at 4 AM daily (after backups complete)
  cron.schedule('0 4 * * *', async () => {
    logger.info('Running backup retention cleanup job');
    try {
      const result = await processBackupRetention();
      logger.info('Backup retention cleanup completed', {
        processed: result.processed,
        totalDeleted: result.totalDeleted,
        totalFreedBytes: result.totalFreedBytes,
        errors: result.errors.length,
      });
    } catch (error) {
      logger.error('Backup retention cleanup failed', {
        error: error instanceof Error ? error.message : String(error)
      });
    }
  });

  // Audit log retention cleanup at 3 AM daily (90-day retention)
  cron.schedule('0 3 * * *', async () => {
    logger.info('Running audit log cleanup job');
    try {
      const result = await processAuditLogCleanup();
      if (result.success) {
        logger.info('Audit log cleanup job completed', {
          deletedCount: result.deletedCount,
          retentionDays: result.retentionDays,
        });
      } else {
        logger.error('Audit log cleanup job failed', {
          error: result.error,
        });
      }
    } catch (error) {
      logger.error('Audit log cleanup job failed', {
        error: error instanceof Error ? error.message : String(error)
      });
    }
  });

  schedulerInitialized = true;
  logger.info('Cron scheduler initialized - notification (8 AM), account purge (2 AM), grace period (2:30 AM), audit log cleanup (3 AM), backup check (every min), retention cleanup (4 AM)');
}

export function isSchedulerInitialized(): boolean {
  return schedulerInitialized;
}