import { Router, Request, Response } from 'express';
import { config } from '../../config';
import {
  claimSpecificAccountForManualQuota,
  getTurnitinAccountById,
} from '../../db/accounts';
import { requireAdminSecret } from '../middleware/admin-secret';
import { getJobById } from '../../db/jobs';
import { runQuotaCheckForAccount } from '../../cron/quota-check';
import { logger } from '../../utils/logger';

const router = Router();
const MAX_MANUAL_QUOTA_CHECKS_PER_WORKER = 1;
let activeManualQuotaChecks = 0;

// Only /internal routes require the admin secret. Keep this scoped so unknown
// public paths return 404 instead of noisy "admin secret mismatch" warnings.
router.use('/internal', requireAdminSecret);

/**
 * POST /internal/jobs/:id/run
 * Manually trigger a job run. Stub implementation — validates the job exists
 * and returns 202 Accepted. Actual worker invocation is handled elsewhere.
 */
router.post('/internal/jobs/:id/run', async (req: Request, res: Response): Promise<void> => {
  const id = String(req.params.id);

  try {
    const job = await getJobById(id);
    if (!job) {
      res.status(404).json({ error: 'Job not found' });
      return;
    }

    logger.info('Manual job run requested', { jobId: id });

    // TODO: Integrate with worker dispatch
    res.status(202).json({ message: 'Job run accepted', jobId: id });
  } catch (err) {
    logger.error('Internal job run error', {
      jobId: id,
      error: err instanceof Error ? err.message : String(err),
    });
    res.status(500).json({ error: 'Internal server error' });
  }
});

/**
 * POST /internal/accounts/:id/quota-check
 * Manually trigger a quota check for a specific account.
 * The check is started in the background after the account is leased, so the
 * dashboard request is not held open for a full browser session.
 */
router.post(
  '/internal/accounts/:id/quota-check',
  async (req: Request, res: Response): Promise<void> => {
    const id = String(req.params.id);
    let handedOffToBackground = false;

    try {
      logger.info('Manual quota check requested', { accountId: id });

      if (activeManualQuotaChecks >= MAX_MANUAL_QUOTA_CHECKS_PER_WORKER) {
        res.status(429).json({
          error: 'This worker is already running a manual quota check. Try another worker or wait briefly.',
        });
        return;
      }

      activeManualQuotaChecks += 1;

      const existingAccount = await getTurnitinAccountById(id);
      if (!existingAccount) {
        activeManualQuotaChecks = Math.max(0, activeManualQuotaChecks - 1);
        res.status(404).json({ error: 'Turnitin account not found' });
        return;
      }

      if (existingAccount.turnitin_status === 'disabled') {
        activeManualQuotaChecks = Math.max(0, activeManualQuotaChecks - 1);
        res.status(409).json({ error: 'This account is disabled and cannot be checked.' });
        return;
      }

      if (existingAccount.turnitin_status === 'login_failed') {
        activeManualQuotaChecks = Math.max(0, activeManualQuotaChecks - 1);
        res.status(409).json({
          error: 'This account is marked login_failed. Fix the credential before checking quota.',
        });
        return;
      }

      if (existingAccount.turnitin_pool_key === 'legacy_carta' || existingAccount.turnitin_pool_key === 'modern_one') {
        activeManualQuotaChecks = Math.max(0, activeManualQuotaChecks - 1);
        res.status(409).json({
          error:
            'Manual quota check supports reusable modern Turnitin accounts only. Legacy and modern_one pools are finalized after submission.',
        });
        return;
      }

      const leaseOwner = `${config.workerId}:manual-quota-check`;
      const claimedAccount = await claimSpecificAccountForManualQuota(id, leaseOwner);
      if (!claimedAccount) {
        activeManualQuotaChecks = Math.max(0, activeManualQuotaChecks - 1);
        res.status(409).json({
          error: 'This account is currently leased by another worker or is not ready for checking.',
        });
        return;
      }

      handedOffToBackground = true;
      void runQuotaCheckForAccount(claimedAccount, {
        source: 'manual',
        fallbackStatus: existingAccount.turnitin_status || 'available',
      })
        .catch((err: unknown) => {
          logger.error('Manual quota check background task failed', {
            accountId: id,
            error: err instanceof Error ? err.message : String(err),
          });
        })
        .finally(() => {
          activeManualQuotaChecks = Math.max(0, activeManualQuotaChecks - 1);
        });

      res.status(202).json({
        message: 'Quota check started',
        accountId: id,
        workerId: config.workerId,
      });
    } catch (err: unknown) {
      logger.error('Manual quota check request failed', {
        accountId: id,
        error: err instanceof Error ? err.message : String(err),
      });
      if (!handedOffToBackground) {
        activeManualQuotaChecks = Math.max(0, activeManualQuotaChecks - 1);
      }
      res.status(500).json({ error: 'Failed to start quota check' });
    }
  },
);

export default router;