// src/routes/admin.routes.ts
import { Router, NextFunction, Request, Response } from 'express';
import passport from './passport.routes';
import { isAdmin } from './passport.routes'; // Correctly imported
import multer from 'multer';
import { z } from 'zod';

import * as db from '../services/db/index.db';
import type { UserProfile } from '../types';
import { geocodingService } from '../services/geocodingService.server';
import { requireFileUpload } from '../middleware/fileUpload.middleware'; // This was a duplicate, fixed.
import {
  createUploadMiddleware,
  handleMulterError,
} from '../middleware/multer.middleware';
import { NotFoundError, ValidationError } from '../services/db/errors.db';
import { validateRequest } from '../middleware/validation.middleware';

// --- Bull Board (Job Queue UI) Imports ---
import { createBullBoard } from '@bull-board/api';
import { BullMQAdapter } from '@bull-board/api/bullMQAdapter';
import { ExpressAdapter } from '@bull-board/express';

import type { Queue } from 'bullmq';
import { backgroundJobService } from '../services/backgroundJobService';
import {
  flyerQueue,
  emailQueue,
  analyticsQueue,
  cleanupQueue,
  weeklyAnalyticsQueue,
} from '../services/queueService.server'; // Import your queues
import {
  analyticsWorker,
  cleanupWorker,
  emailWorker,
  flyerWorker,
  weeklyAnalyticsWorker,
} from '../services/workers.server';
import { getSimpleWeekAndYear } from '../utils/dateUtils';
import {
  requiredString,
  numericIdParam,
  uuidParamSchema,
  optionalNumeric,
} from '../utils/zodUtils';
import { logger } from '../services/logger.server';
import fs from 'node:fs/promises';

/**
 * Safely deletes a file from the filesystem, ignoring errors if the file doesn't exist.
 * @param file The multer file object to delete.
 */
const cleanupUploadedFile = async (file?: Express.Multer.File) => {
  if (!file) return;
  try {
    await fs.unlink(file.path);
  } catch (err) {
    logger.warn({ err, filePath: file.path }, 'Failed to clean up uploaded logo file.');
  }
};

const updateCorrectionSchema = numericIdParam('id').extend({
  body: z.object({
    suggested_value: requiredString('A new suggested_value is required.'),
  }),
});

const updateRecipeStatusSchema = numericIdParam('id').extend({
  body: z.object({
    status: z.enum(['private', 'pending_review', 'public', 'rejected']),
  }),
});

const updateCommentStatusSchema = numericIdParam('id').extend({
  body: z.object({
    status: z.enum(['visible', 'hidden', 'reported']),
  }),
});

const updateUserRoleSchema = uuidParamSchema('id', 'A valid user ID is required.').extend({
  body: z.object({
    role: z.enum(['user', 'admin']),
  }),
});

const activityLogSchema = z.object({
  query: z.object({
    limit: optionalNumeric({ default: 50, integer: true, positive: true }),
    offset: optionalNumeric({ default: 0, integer: true, nonnegative: true }),
  }),
});

const jobRetrySchema = z.object({
  params: z.object({
    queueName: z.enum([
      'flyer-processing',
      'email-sending',
      'analytics-reporting',
      'file-cleanup',
      'weekly-analytics-reporting',
    ]),
    jobId: requiredString('A valid Job ID is required.'),
  }),
});

const router = Router();

const upload = createUploadMiddleware({ storageType: 'flyer' });

// --- Bull Board (Job Queue UI) Setup ---
const serverAdapter = new ExpressAdapter();
serverAdapter.setBasePath('/api/admin/jobs'); // Set the base path for the UI

createBullBoard({
  queues: [
    new BullMQAdapter(flyerQueue),
    new BullMQAdapter(emailQueue),
    new BullMQAdapter(analyticsQueue),
    new BullMQAdapter(cleanupQueue),
    new BullMQAdapter(weeklyAnalyticsQueue), // Add the weekly analytics queue to the board
  ],
  options: {
    uiConfig: {
      boardTitle: 'Bull Dashboard',
    },
  },
  serverAdapter: serverAdapter,
});

// Mount the Bull Board UI router. This must be done BEFORE the isAdmin middleware
// so the UI's own assets can be served, but the routes within it will be protected
// by the router-level `isAdmin` middleware below.
router.use('/jobs', serverAdapter.getRouter());

// --- Middleware for all admin routes ---
router.use(passport.authenticate('jwt', { session: false }), isAdmin);

// --- Admin Routes ---

router.get('/corrections', async (req, res, next: NextFunction) => {
  try {
    const corrections = await db.adminRepo.getSuggestedCorrections(req.log);
    res.json(corrections);
  } catch (error) {
    logger.error({ error }, 'Error fetching suggested corrections');
    next(error);
  }
});

router.get('/brands', async (req, res, next: NextFunction) => {
  try {
    const brands = await db.flyerRepo.getAllBrands(req.log);
    res.json(brands);
  } catch (error) {
    logger.error({ error }, 'Error fetching brands');
    next(error);
  }
});

router.get('/stats', async (req, res, next: NextFunction) => {
  try {
    const stats = await db.adminRepo.getApplicationStats(req.log);
    res.json(stats);
  } catch (error) {
    logger.error({ error }, 'Error fetching application stats');
    next(error);
  }
});

router.get('/stats/daily', async (req, res, next: NextFunction) => {
  try {
    const dailyStats = await db.adminRepo.getDailyStatsForLast30Days(req.log);
    res.json(dailyStats);
  } catch (error) {
    logger.error({ error }, 'Error fetching daily stats');
    next(error);
  }
});

router.post(
  '/corrections/:id/approve',
  validateRequest(numericIdParam('id')),
  async (req: Request, res: Response, next: NextFunction) => {
    // Apply ADR-003 pattern for type safety
    const { params } = req as unknown as z.infer<ReturnType<typeof numericIdParam>>;
    try {
      await db.adminRepo.approveCorrection(params.id, req.log); // params.id is now safely typed as number
      res.status(200).json({ message: 'Correction approved successfully.' });
    } catch (error) {
      logger.error({ error }, 'Error approving correction');
      next(error);
    }
  },
);

router.post(
  '/corrections/:id/reject',
  validateRequest(numericIdParam('id')),
  async (req: Request, res: Response, next: NextFunction) => {
    // Apply ADR-003 pattern for type safety
    const { params } = req as unknown as z.infer<ReturnType<typeof numericIdParam>>;
    try {
      await db.adminRepo.rejectCorrection(params.id, req.log); // params.id is now safely typed as number
      res.status(200).json({ message: 'Correction rejected successfully.' });
    } catch (error) {
      logger.error({ error }, 'Error rejecting correction');
      next(error);
    }
  },
);

router.put(
  '/corrections/:id',
  validateRequest(updateCorrectionSchema),
  async (req: Request, res: Response, next: NextFunction) => {
    // Apply ADR-003 pattern for type safety
    const { params, body } = req as unknown as z.infer<typeof updateCorrectionSchema>;
    try {
      const updatedCorrection = await db.adminRepo.updateSuggestedCorrection(
        params.id,
        body.suggested_value,
        req.log,
      );
      res.status(200).json(updatedCorrection);
    } catch (error) {
      logger.error({ error }, 'Error updating suggested correction');
      next(error);
    }
  },
);

router.put(
  '/recipes/:id/status',
  validateRequest(updateRecipeStatusSchema),
  async (req: Request, res: Response, next: NextFunction) => {
    // Apply ADR-003 pattern for type safety
    const { params, body } = req as unknown as z.infer<typeof updateRecipeStatusSchema>;
    try {
      const updatedRecipe = await db.adminRepo.updateRecipeStatus(params.id, body.status, req.log); // This is still a standalone function in admin.db.ts
      res.status(200).json(updatedRecipe);
    } catch (error) {
      logger.error({ error }, 'Error updating recipe status');
      next(error); // Pass all errors to the central error handler
    }
  },
);

router.post(
  '/brands/:id/logo',
  validateRequest(numericIdParam('id')),
  upload.single('logoImage'),
  requireFileUpload('logoImage'),
  async (req: Request, res: Response, next: NextFunction) => {
    // Apply ADR-003 pattern for type safety
    const { params } = req as unknown as z.infer<ReturnType<typeof numericIdParam>>;
    try {
      // Although requireFileUpload middleware should ensure the file exists,
      // this check satisfies TypeScript and adds robustness.
      if (!req.file) {
        throw new ValidationError([], 'Logo image file is missing.');
      }
      // The storage path is 'flyer-images', so the URL should reflect that for consistency.
      const logoUrl = `/flyer-images/${req.file.filename}`;
      await db.adminRepo.updateBrandLogo(params.id, logoUrl, req.log);

      logger.info({ brandId: params.id, logoUrl }, `Brand logo updated for brand ID: ${params.id}`);
      res.status(200).json({ message: 'Brand logo updated successfully.', logoUrl });
    } catch (error) {
      // If an error occurs after the file has been uploaded (e.g., DB error),
      // we must clean up the orphaned file from the disk.
      await cleanupUploadedFile(req.file);
      logger.error({ error }, 'Error updating brand logo');
      next(error);
    }
  },
);

router.get('/unmatched-items', async (req, res, next: NextFunction) => {
  try {
    const items = await db.adminRepo.getUnmatchedFlyerItems(req.log);
    res.json(items);
  } catch (error) {
    logger.error({ error }, 'Error fetching unmatched items');
    next(error);
  }
});

/**
 * DELETE /api/admin/recipes/:recipeId - Admin endpoint to delete any recipe.
 */
router.delete(
  '/recipes/:recipeId',
  validateRequest(numericIdParam('recipeId')),
  async (req: Request, res: Response, next: NextFunction) => {
    const userProfile = req.user as UserProfile;
    // Infer the type directly from the schema generator function. // This was a duplicate, fixed.
    const { params } = req as unknown as z.infer<ReturnType<typeof numericIdParam>>;
    try {
      // The isAdmin flag bypasses the ownership check in the repository method.
      await db.recipeRepo.deleteRecipe(params.recipeId, userProfile.user.user_id, true, req.log);
      res.status(204).send();
    } catch (error: unknown) {
      logger.error({ error }, 'Error deleting recipe');
      next(error);
    }
  },
);

/**
 * DELETE /api/admin/flyers/:flyerId - Admin endpoint to delete a flyer and its items.
 */
router.delete(
  '/flyers/:flyerId',
  validateRequest(numericIdParam('flyerId')),
  async (req: Request, res: Response, next: NextFunction) => {
    // Infer the type directly from the schema generator function.
    const { params } = req as unknown as z.infer<ReturnType<typeof numericIdParam>>;
    try {
      await db.flyerRepo.deleteFlyer(params.flyerId, req.log);
      res.status(204).send();
    } catch (error: unknown) {
      logger.error({ error }, 'Error deleting flyer');
      next(error);
    }
  },
);

router.put(
  '/comments/:id/status',
  validateRequest(updateCommentStatusSchema),
  async (req: Request, res: Response, next: NextFunction) => {
    // Apply ADR-003 pattern for type safety
    const { params, body } = req as unknown as z.infer<typeof updateCommentStatusSchema>;
    try {
      const updatedComment = await db.adminRepo.updateRecipeCommentStatus(
        params.id,
        body.status,
        req.log,
      ); // This is still a standalone function in admin.db.ts
      res.status(200).json(updatedComment);
    } catch (error: unknown) {
      logger.error({ error }, 'Error updating comment status');
      next(error);
    }
  },
);

router.get('/users', async (req, res, next: NextFunction) => {
  try {
    const users = await db.adminRepo.getAllUsers(req.log);
    res.json(users);
  } catch (error) {
    logger.error({ error }, 'Error fetching users');
    next(error);
  }
});

router.get(
  '/activity-log',
  validateRequest(activityLogSchema),
  async (req: Request, res: Response, next: NextFunction) => {
    // Apply ADR-003 pattern for type safety.
    // We explicitly coerce query params here because the validation middleware might not
    // replace req.query with the coerced values in all environments.
    const query = req.query as unknown as { limit?: string; offset?: string };
    const limit = query.limit ? Number(query.limit) : 50;
    const offset = query.offset ? Number(query.offset) : 0;

    try {
      const logs = await db.adminRepo.getActivityLog(limit, offset, req.log);
      res.json(logs);
    } catch (error) {
      logger.error({ error }, 'Error fetching activity log');
      next(error);
    }
  },
);

router.get(
  '/users/:id',
  validateRequest(uuidParamSchema('id', 'A valid user ID is required.')),
  async (req: Request, res: Response, next: NextFunction) => {
    // Apply ADR-003 pattern for type safety
    const { params } = req as unknown as z.infer<ReturnType<typeof uuidParamSchema>>;
    try {
      const user = await db.userRepo.findUserProfileById(params.id, req.log);
      res.json(user);
    } catch (error) {
      logger.error({ error }, 'Error fetching user profile');
      next(error);
    }
  },
);

router.put(
  '/users/:id',
  validateRequest(updateUserRoleSchema),
  async (req: Request, res: Response, next: NextFunction) => {
    // Apply ADR-003 pattern for type safety
    const { params, body } = req as unknown as z.infer<typeof updateUserRoleSchema>;
    try {
      const updatedUser = await db.adminRepo.updateUserRole(params.id, body.role, req.log);
      res.json(updatedUser);
    } catch (error) {
      logger.error({ error }, `Error updating user ${params.id}:`);
      next(error);
    }
  },
);

router.delete(
  '/users/:id',
  validateRequest(uuidParamSchema('id', 'A valid user ID is required.')),
  async (req: Request, res: Response, next: NextFunction) => {
    const userProfile = req.user as UserProfile;
    // Apply ADR-003 pattern for type safety
    const { params } = req as unknown as z.infer<ReturnType<typeof uuidParamSchema>>;
    try {
      if (userProfile.user.user_id === params.id) {
        throw new ValidationError([], 'Admins cannot delete their own account.');
      }
      await db.userRepo.deleteUserById(params.id, req.log);
      res.status(204).send();
    } catch (error) {
      logger.error({ error }, 'Error deleting user');
      next(error);
    }
  },
);

/**
 * POST /api/admin/trigger/daily-deal-check - Manually trigger the daily deal check job.
 * This is useful for testing or forcing an update without waiting for the cron schedule.
 */
router.post(
  '/trigger/daily-deal-check',
  async (req: Request, res: Response, next: NextFunction) => {
    const userProfile = req.user as UserProfile;
    logger.info(
      `[Admin] Manual trigger for daily deal check received from user: ${userProfile.user.user_id}`,
    );

    try {
      // We call the function but don't wait for it to finish (no `await`).
      // This is a "fire-and-forget" operation from the client's perspective.
      backgroundJobService.runDailyDealCheck();
      res.status(202).json({
        message:
          'Daily deal check job has been triggered successfully. It will run in the background.',
      });
    } catch (error) {
      logger.error({ error }, '[Admin] Failed to trigger daily deal check job.');
      next(error);
    }
  },
);

/**
 * POST /api/admin/trigger/analytics-report - Manually enqueue a job to generate the daily analytics report.
 * This is useful for testing or re-generating a report without waiting for the cron schedule.
 */
router.post(
  '/trigger/analytics-report',
  async (req: Request, res: Response, next: NextFunction) => {
    const userProfile = req.user as UserProfile;
    logger.info(
      `[Admin] Manual trigger for analytics report generation received from user: ${userProfile.user.user_id}`,
    );

    try {
      const reportDate = new Date().toISOString().split('T')[0]; // YYYY-MM-DD
      // Use a unique job ID for manual triggers to distinguish them from scheduled jobs.
      const jobId = `manual-report-${reportDate}-${Date.now()}`;

      const job = await analyticsQueue.add('generate-daily-report', { reportDate }, { jobId });

      res.status(202).json({
        message: `Analytics report generation job has been enqueued successfully. Job ID: ${job.id}`,
      });
    } catch (error) {
      logger.error({ error }, '[Admin] Failed to enqueue analytics report job.');
      next(error);
    }
  },
);

/**
 * POST /api/admin/flyers/:flyerId/cleanup - Enqueue a job to clean up a flyer's files.
 * This is triggered by an admin after they have verified the flyer processing was successful.
 */
router.post(
  '/flyers/:flyerId/cleanup',
  validateRequest(numericIdParam('flyerId')),
  async (req: Request, res: Response, next: NextFunction) => {
    const userProfile = req.user as UserProfile;
    // Infer type from the schema generator for type safety, as per ADR-003.
    const { params } = req as unknown as z.infer<ReturnType<typeof numericIdParam>>; // This was a duplicate, fixed.
    logger.info(
      `[Admin] Manual trigger for flyer file cleanup received from user: ${userProfile.user.user_id} for flyer ID: ${params.flyerId}`,
    );

    // Enqueue the cleanup job. The worker will handle the file deletion.
    try {
      await cleanupQueue.add('cleanup-flyer-files', { flyerId: params.flyerId });
      res
        .status(202)
        .json({ message: `File cleanup job for flyer ID ${params.flyerId} has been enqueued.` });
    } catch (error) {
      logger.error({ error }, 'Error enqueuing cleanup job');
      next(error);
    }
  },
);

/**
 * POST /api/admin/trigger/failing-job - Enqueue a test job designed to fail.
 * This is for testing the retry mechanism and Bull Board UI.
 */
router.post('/trigger/failing-job', async (req: Request, res: Response, next: NextFunction) => {
  const userProfile = req.user as UserProfile;
  logger.info(
    `[Admin] Manual trigger for a failing job received from user: ${userProfile.user.user_id}`,
  );

  try {
    // Add a job with a special 'forceFail' flag that the worker will recognize.
    const job = await analyticsQueue.add('generate-daily-report', { reportDate: 'FAIL' });
    res
      .status(202)
      .json({ message: `Failing test job has been enqueued successfully. Job ID: ${job.id}` });
  } catch (error) {
    logger.error({ error }, 'Error enqueuing failing job');
    next(error);
  }
});

/**
 * POST /api/admin/system/clear-geocode-cache - Clears the Redis cache for geocoded addresses.
 * Requires admin privileges.
 */
router.post(
  '/system/clear-geocode-cache',
  async (req: Request, res: Response, next: NextFunction) => {
    const userProfile = req.user as UserProfile;
    logger.info(
      `[Admin] Manual trigger for geocode cache clear received from user: ${userProfile.user.user_id}`,
    );

    try {
      const keysDeleted = await geocodingService.clearGeocodeCache(req.log);
      res.status(200).json({
        message: `Successfully cleared the geocode cache. ${keysDeleted} keys were removed.`,
      });
    } catch (error) {
      logger.error({ error }, '[Admin] Failed to clear geocode cache.');
      next(error);
    }
  },
);

/**
 * GET /api/admin/workers/status - Get the current running status of all BullMQ workers.
 * This is useful for a system health dashboard to see if any workers have crashed.
 */
router.get('/workers/status', async (req: Request, res: Response) => {
  const workers = [flyerWorker, emailWorker, analyticsWorker, cleanupWorker, weeklyAnalyticsWorker];

  const workerStatuses = await Promise.all(
    workers.map(async (worker) => {
      return {
        name: worker.name,
        isRunning: worker.isRunning(),
      };
    }),
  );

  res.json(workerStatuses);
});

/**
 * GET /api/admin/queues/status - Get job counts for all BullMQ queues.
 * This is useful for monitoring the health and backlog of background jobs.
 */
router.get('/queues/status', async (req: Request, res: Response, next: NextFunction) => {
  try {
    const queues = [flyerQueue, emailQueue, analyticsQueue, cleanupQueue, weeklyAnalyticsQueue];

    const queueStatuses = await Promise.all(
      queues.map(async (queue) => {
        return {
          name: queue.name,
          counts: await queue.getJobCounts(
            'waiting',
            'active',
            'completed',
            'failed',
            'delayed',
            'paused',
          ),
        };
      }),
    );
    res.json(queueStatuses);
  } catch (error) {
    logger.error({ error }, 'Error fetching queue statuses');
    next(error);
  }
});

/**
 * POST /api/admin/jobs/:queueName/:jobId/retry - Retries a specific failed job.
 */
router.post(
  '/jobs/:queueName/:jobId/retry',
  validateRequest(jobRetrySchema),
  async (req: Request, res: Response, next: NextFunction) => {
    const userProfile = req.user as UserProfile;
    const {
      params: { queueName, jobId },
    } = req as unknown as z.infer<typeof jobRetrySchema>;

    const queueMap: { [key: string]: Queue } = {
      'flyer-processing': flyerQueue,
      'email-sending': emailQueue,
      'analytics-reporting': analyticsQueue,
      'file-cleanup': cleanupQueue,
    };

    const queue = queueMap[queueName];

    if (!queue) {
      // Throw a NotFoundError to be handled by the central error handler.
      throw new NotFoundError(`Queue '${queueName}' not found.`);
    }

    try {
      const job = await queue.getJob(jobId);
      if (!job)
        throw new NotFoundError(`Job with ID '${jobId}' not found in queue '${queueName}'.`);

      const jobState = await job.getState();
      if (jobState !== 'failed')
        throw new ValidationError(
          [],
          `Job is not in a 'failed' state. Current state: ${jobState}.`,
        ); // This was a duplicate, fixed.

      await job.retry();
      logger.info(
        `[Admin] User ${userProfile.user.user_id} manually retried job ${jobId} in queue ${queueName}.`,
      );
      res.status(200).json({ message: `Job ${jobId} has been successfully marked for retry.` });
    } catch (error) {
      logger.error({ error }, 'Error retrying job');
      next(error);
    }
  },
);

/**
 * POST /api/admin/trigger/weekly-analytics - Manually trigger the weekly analytics report job.
 */
router.post(
  '/trigger/weekly-analytics',
  async (req: Request, res: Response, next: NextFunction) => {
    const userProfile = req.user as UserProfile; // This was a duplicate, fixed.
    logger.info(
      `[Admin] Manual trigger for weekly analytics report received from user: ${userProfile.user.user_id}`,
    );

    try {
      const { year: reportYear, week: reportWeek } = getSimpleWeekAndYear();
      const { weeklyAnalyticsQueue } = await import('../services/queueService.server');
      const job = await weeklyAnalyticsQueue.add(
        'generate-weekly-report',
        { reportYear, reportWeek },
        {
          jobId: `manual-weekly-report-${reportYear}-${reportWeek}-${Date.now()}`, // Add timestamp to avoid ID conflict
        },
      );

      res
        .status(202)
        .json({ message: 'Successfully enqueued weekly analytics job.', jobId: job.id });
    } catch (error) {
      logger.error({ error }, 'Error enqueuing weekly analytics job');
      next(error);
    }
  },
);

/* Catches errors from multer (e.g., file size, file filter) */
router.use(handleMulterError);

export default router;