/**
 * AuditLogController - Controller de Logs de Auditoría
 *
 * Endpoints REST para consulta de logs de auditoría.
 *
 * @module Admin
 */

import { Router, Request, Response, NextFunction } from 'express';
import { DataSource } from 'typeorm';
import { AuditLogService, AuditLogFilters } from '../services/audit-log.service';
import { AuthMiddleware } from '../../auth/middleware/auth.middleware';
import { AuthService } from '../../auth/services/auth.service';
import { AuditLog } from '../entities/audit-log.entity';
import { User } from '../../core/entities/user.entity';
import { Tenant } from '../../core/entities/tenant.entity';
import { RefreshToken } from '../../auth/entities/refresh-token.entity';

interface ServiceContext {
  tenantId: string;
  userId?: string;
}

export function createAuditLogController(dataSource: DataSource): Router {
  const router = Router();

  // Repositorios
  const auditLogRepository = dataSource.getRepository(AuditLog);
  const userRepository = dataSource.getRepository(User);
  const tenantRepository = dataSource.getRepository(Tenant);
  const refreshTokenRepository = dataSource.getRepository(RefreshToken);

  // Servicios
  const auditLogService = new AuditLogService(auditLogRepository);
  const authService = new AuthService(userRepository, tenantRepository, refreshTokenRepository as any);
  const authMiddleware = new AuthMiddleware(authService, dataSource);

  // Helper para crear contexto
  const getContext = (req: Request): ServiceContext => {
    if (!req.tenantId) {
      throw new Error('Tenant ID is required');
    }
    return {
      tenantId: req.tenantId,
      userId: req.user?.sub,
    };
  };

  /**
   * GET /audit-logs
   */
  router.get('/', authMiddleware.authenticate, authMiddleware.authorize('admin', 'director', 'auditor'), async (req: Request, res: Response, next: NextFunction): Promise<void> => {
    try {
      if (!req.tenantId) {
        res.status(400).json({ error: 'Bad Request', message: 'Tenant ID required' });
        return;
      }

      const page = parseInt(req.query.page as string) || 1;
      const limit = Math.min(parseInt(req.query.limit as string) || 50, 200);

      const filters: AuditLogFilters = {};
      if (req.query.userId) filters.userId = req.query.userId as string;
      if (req.query.category) filters.category = req.query.category as any;
      if (req.query.action) filters.action = req.query.action as any;
      if (req.query.severity) filters.severity = req.query.severity as any;
      if (req.query.entityType) filters.entityType = req.query.entityType as string;
      if (req.query.entityId) filters.entityId = req.query.entityId as string;
      if (req.query.module) filters.module = req.query.module as string;
      if (req.query.isSuccess !== undefined) filters.isSuccess = req.query.isSuccess === 'true';
      if (req.query.dateFrom) filters.dateFrom = new Date(req.query.dateFrom as string);
      if (req.query.dateTo) filters.dateTo = new Date(req.query.dateTo as string);
      if (req.query.ipAddress) filters.ipAddress = req.query.ipAddress as string;
      if (req.query.search) filters.search = req.query.search as string;

      const result = await auditLogService.findWithFilters(getContext(req), filters, page, limit);

      res.status(200).json({
        success: true,
        data: result.data,
        pagination: { total: result.total, page: result.page, limit: result.limit, totalPages: result.totalPages },
      });
    } catch (error) {
      next(error);
    }
  });

  /**
   * GET /audit-logs/stats
   */
  router.get('/stats', authMiddleware.authenticate, authMiddleware.authorize('admin', 'director', 'auditor'), async (req: Request, res: Response, next: NextFunction): Promise<void> => {
    try {
      if (!req.tenantId) {
        res.status(400).json({ error: 'Bad Request', message: 'Tenant ID required' });
        return;
      }

      const days = parseInt(req.query.days as string) || 30;
      const stats = await auditLogService.getStats(getContext(req), days);

      res.status(200).json({ success: true, data: stats });
    } catch (error) {
      next(error);
    }
  });

  /**
   * GET /audit-logs/critical
   */
  router.get('/critical', authMiddleware.authenticate, authMiddleware.authorize('admin', 'director'), async (req: Request, res: Response, next: NextFunction): Promise<void> => {
    try {
      if (!req.tenantId) {
        res.status(400).json({ error: 'Bad Request', message: 'Tenant ID required' });
        return;
      }

      const days = parseInt(req.query.days as string) || 7;
      const limit = Math.min(parseInt(req.query.limit as string) || 100, 500);

      const logs = await auditLogService.getCriticalLogs(getContext(req), days, limit);
      res.status(200).json({ success: true, data: logs });
    } catch (error) {
      next(error);
    }
  });

  /**
   * GET /audit-logs/failed
   */
  router.get('/failed', authMiddleware.authenticate, authMiddleware.authorize('admin', 'director'), async (req: Request, res: Response, next: NextFunction): Promise<void> => {
    try {
      if (!req.tenantId) {
        res.status(400).json({ error: 'Bad Request', message: 'Tenant ID required' });
        return;
      }

      const hours = parseInt(req.query.hours as string) || 24;
      const limit = Math.min(parseInt(req.query.limit as string) || 100, 500);

      const logs = await auditLogService.getFailedLogs(getContext(req), hours, limit);
      res.status(200).json({ success: true, data: logs });
    } catch (error) {
      next(error);
    }
  });

  /**
   * GET /audit-logs/entity/:type/:id
   */
  router.get('/entity/:type/:id', authMiddleware.authenticate, authMiddleware.authorize('admin', 'director', 'auditor'), async (req: Request, res: Response, next: NextFunction): Promise<void> => {
    try {
      if (!req.tenantId) {
        res.status(400).json({ error: 'Bad Request', message: 'Tenant ID required' });
        return;
      }

      const page = parseInt(req.query.page as string) || 1;
      const limit = Math.min(parseInt(req.query.limit as string) || 20, 100);

      const result = await auditLogService.findByEntity(
        getContext(req),
        req.params.type,
        req.params.id,
        page,
        limit
      );

      res.status(200).json({
        success: true,
        data: result.data,
        pagination: { total: result.total, page: result.page, limit: result.limit, totalPages: result.totalPages },
      });
    } catch (error) {
      next(error);
    }
  });

  /**
   * GET /audit-logs/user/:userId
   */
  router.get('/user/:userId', authMiddleware.authenticate, authMiddleware.authorize('admin', 'director', 'auditor'), async (req: Request, res: Response, next: NextFunction): Promise<void> => {
    try {
      if (!req.tenantId) {
        res.status(400).json({ error: 'Bad Request', message: 'Tenant ID required' });
        return;
      }

      const page = parseInt(req.query.page as string) || 1;
      const limit = Math.min(parseInt(req.query.limit as string) || 50, 200);

      const result = await auditLogService.findByUser(
        getContext(req),
        req.params.userId,
        page,
        limit
      );

      res.status(200).json({
        success: true,
        data: result.data,
        pagination: { total: result.total, page: result.page, limit: result.limit, totalPages: result.totalPages },
      });
    } catch (error) {
      next(error);
    }
  });

  /**
   * POST /audit-logs/cleanup
   * Cleanup expired logs
   */
  router.post('/cleanup', authMiddleware.authenticate, authMiddleware.authorize('admin'), async (req: Request, res: Response, next: NextFunction): Promise<void> => {
    try {
      if (!req.tenantId) {
        res.status(400).json({ error: 'Bad Request', message: 'Tenant ID required' });
        return;
      }

      const deleted = await auditLogService.cleanupExpiredLogs(getContext(req));
      res.status(200).json({
        success: true,
        message: `Cleaned up ${deleted} expired audit logs`,
        data: { deleted },
      });
    } catch (error) {
      next(error);
    }
  });

  return router;
}

export default createAuditLogController;