/**
 * Antivirus Admin Routes
 * Admin endpoints for ClamAV management and audit logs.
 */

import { Router, Request, Response } from 'express';
import { authenticateToken } from '../middlewares/auth.middleware';
import { requireAdmin } from '../middlewares/authorization.middleware';
import { asyncHandler } from '../middlewares/errorHandler.middleware';
import {
    getToggleStatus,
    setToggleStatus,
    getToggleHistory,
} from '../services/clamav/clamavToggleManager';
import { pingDaemon } from '../services/clamav/clamavScanWrapper';
import {
    readAuditLogs,
    getAuditStats,
    exportAuditLogsCSV,
    logSecurityEvent,
    SecurityEventType,
} from '../services/logging/securityEventLogger';

const router = Router();

// All routes require admin authentication
router.use(authenticateToken, requireAdmin);

/**
 * GET /api/v1/antivirus/clamav-status
 * Get ClamAV toggle status, daemon health, and recent toggle history
 */
router.get(
    '/clamav-status',
    asyncHandler(async (_req: Request, res: Response) => {
        const toggleStatus = getToggleStatus();
        const daemonStatus = await pingDaemon();
        const recentHistory = getToggleHistory(10);

        res.json({
            success: true,
            toggle: toggleStatus,
            daemon: daemonStatus,
            recentHistory,
        });
    })
);

/**
 * POST /api/v1/antivirus/clamav-toggle
 * Enable or disable ClamAV scanning
 * Body: { enabled: boolean, reason: string }
 */
router.post(
    '/clamav-toggle',
    asyncHandler(async (req: Request, res: Response) => {
        const { enabled, reason } = req.body;

        if (typeof enabled !== 'boolean') {
            res.status(400).json({
                success: false,
                message: '"enabled" must be a boolean',
            });
            return;
        }

        if (!reason || typeof reason !== 'string') {
            res.status(400).json({
                success: false,
                message: '"reason" is required',
            });
            return;
        }

        const userId = (req as any).user?.id || (req as any).user?.email || 'unknown';
        const result = setToggleStatus(enabled, userId, reason);

        // Log the admin action
        logSecurityEvent(SecurityEventType.CLAMAV_TOGGLE_CHANGED, {
            enabled,
            reason,
            changedBy: userId,
        }, userId);

        res.json({
            success: true,
            message: `ClamAV scanning ${enabled ? 'enabled' : 'disabled'}`,
            state: result.state,
        });
    })
);

/**
 * GET /api/v1/antivirus/audit-logs
 * Search and paginate security audit logs
 * Query params: eventType, severity, category, startDate, endDate, limit, offset
 */
router.get(
    '/audit-logs',
    asyncHandler(async (req: Request, res: Response) => {
        const {
            eventType,
            severity,
            category,
            startDate,
            endDate,
            limit = '50',
            offset = '0',
        } = req.query;

        const result = readAuditLogs({
            eventType: eventType as string,
            severity: severity as string,
            category: category as string,
            startDate: startDate as string,
            endDate: endDate as string,
            limit: parseInt(limit as string, 10),
            offset: parseInt(offset as string, 10),
        });

        res.json({
            success: true,
            ...result,
        });
    })
);

/**
 * GET /api/v1/antivirus/audit-logs/export
 * Export filtered audit logs as CSV
 */
router.get(
    '/audit-logs/export',
    asyncHandler(async (req: Request, res: Response) => {
        const { eventType, severity, startDate, endDate } = req.query;

        const csv = exportAuditLogsCSV({
            eventType: eventType as string,
            severity: severity as string,
            startDate: startDate as string,
            endDate: endDate as string,
        });

        res.setHeader('Content-Type', 'text/csv');
        res.setHeader('Content-Disposition', `attachment; filename=audit-logs-${new Date().toISOString().split('T')[0]}.csv`);
        res.send(csv);
    })
);

/**
 * GET /api/v1/antivirus/audit-stats
 * Get audit log statistics
 */
router.get(
    '/audit-stats',
    asyncHandler(async (_req: Request, res: Response) => {
        const stats = getAuditStats();

        res.json({
            success: true,
            stats,
        });
    })
);

export default router;