import { config, validateConfig } from './config';
import { logger, setWorkerId } from './utils/logger';
import { createApp } from './server/app';
import { startWorkerManager, stopWorkerManager } from './worker/manager';
import { closeBrowser } from './worker/browser-pool';
import { runQuotaCheckCron } from './cron/quota-check';
import { runCleanupReportsCron } from './cron/cleanup-reports';
import { runStaleRecoveryCron } from './cron/stale-recovery';
import * as cron from 'node-cron';

async function main(): Promise<void> {
  // Validate environment
  try {
    validateConfig();
  } catch (err) {
    console.error('Configuration error:', err instanceof Error ? err.message : err);
    process.exit(1);
  }

  setWorkerId(config.workerId);
  logger.info('Turnitin Worker starting', {
    workerId: config.workerId,
    maxWorkers: config.maxWorkers,
    port: config.port,
    enableWorker: config.enableWorker,
    enableCron: config.enableCron,
  });

  // Start Express server
  const app = createApp();
  const server = app.listen(config.port, () => {
    logger.info(`HTTP server listening on port ${config.port}`);
  });

  if (config.enableWorker) {
    // Start worker manager (polls for jobs)
    startWorkerManager().catch((err) => {
      logger.error('Worker manager fatal error', {
        error: err instanceof Error ? err.message : String(err),
      });
    });
  } else {
    logger.info('Worker manager disabled by ENABLE_WORKER=false');
  }

  if (config.enableCron) {
    // Schedule cron jobs
    // Quota check: every N minutes
    const quotaCronExpr = `*/${config.quotaCheckInterval} * * * *`;
    cron.schedule(quotaCronExpr, () => {
      runQuotaCheckCron().catch((err) => {
        logger.error('Quota check cron error', {
          error: err instanceof Error ? err.message : String(err),
        });
      });
    });
    logger.info(`Quota check cron scheduled: ${quotaCronExpr}`);

    // Report cleanup: every N minutes
    const cleanupCronExpr = `*/${config.cleanupInterval} * * * *`;
    cron.schedule(cleanupCronExpr, () => {
      runCleanupReportsCron().catch((err) => {
        logger.error('Report cleanup cron error', {
          error: err instanceof Error ? err.message : String(err),
        });
      });
    });
    logger.info(`Report cleanup cron scheduled: ${cleanupCronExpr}`);

    // Stale recovery: every N minutes
    const staleCronExpr = `*/${config.staleRecoveryInterval} * * * *`;
    cron.schedule(staleCronExpr, () => {
      runStaleRecoveryCron().catch((err) => {
        logger.error('Stale recovery cron error', {
          error: err instanceof Error ? err.message : String(err),
        });
      });
    });
    logger.info(`Stale recovery cron scheduled: ${staleCronExpr}`);
  } else {
    logger.info('Cron jobs disabled by ENABLE_CRON=false');
  }

  logger.info('All systems started successfully');

  // Graceful shutdown
  const shutdown = async (signal: string) => {
    logger.info(`Received ${signal}, shutting down gracefully...`);

    // Stop accepting new jobs
    stopWorkerManager();

    // Close HTTP server
    server.close(() => {
      logger.info('HTTP server closed');
    });

    // Wait for active workers to finish (max 60 seconds)
    const maxWait = 60000;
    const start = Date.now();
    const { getActiveWorkerCount } = await import('./worker/manager');
    while (getActiveWorkerCount() > 0 && Date.now() - start < maxWait) {
      logger.info(`Waiting for ${getActiveWorkerCount()} active workers to finish...`);
      await new Promise((r) => setTimeout(r, 2000));
    }

    // Close browser
    await closeBrowser();

    logger.info('Shutdown complete');
    process.exit(0);
  };

  process.on('SIGTERM', () => shutdown('SIGTERM'));
  process.on('SIGINT', () => shutdown('SIGINT'));

  // Handle uncaught errors
  process.on('uncaughtException', (err) => {
    logger.error('Uncaught exception', {
      error: err.message,
      stack: err.stack,
    });
    // Don't exit on uncaught exceptions in worker service
    // The worker loop has its own error handling
  });

  process.on('unhandledRejection', (reason) => {
    logger.error('Unhandled promise rejection', {
      reason: reason instanceof Error ? reason.message : String(reason),
    });
  });
}

main().catch((err) => {
  console.error('Fatal startup error:', err);
  process.exit(1);
});