/**
 * Secure SMTP Server Utility Functions
 * Provides helper functions for creating and managing secure TLS server
 */
import * as plugins from '../../../plugins.js';
import { loadCertificatesFromString, generateSelfSignedCertificates, createTlsOptions } from './certificate-utils.js';
import { SmtpLogger } from './utils/logging.js';
/**
 * Create a secure TLS server for direct TLS connections
 * @param options - TLS certificate options
 * @returns A configured TLS server or undefined if TLS is not available
 */
export function createSecureTlsServer(options) {
    try {
        // Log the creation attempt
        SmtpLogger.info('Creating secure TLS server for direct connections');
        // Load certificates from strings
        let certificates;
        try {
            certificates = loadCertificatesFromString({
                key: options.key,
                cert: options.cert,
                ca: options.ca
            });
            SmtpLogger.info('Successfully loaded TLS certificates for secure server');
        }
        catch (certificateError) {
            SmtpLogger.warn(`Failed to load certificates, using self-signed: ${certificateError instanceof Error ? certificateError.message : String(certificateError)}`);
            certificates = generateSelfSignedCertificates();
        }
        // Create server-side TLS options
        const tlsOptions = createTlsOptions(certificates, true);
        // Log details for debugging
        SmtpLogger.debug('Creating secure server with options', {
            certificates: {
                keyLength: certificates.key.length,
                certLength: certificates.cert.length,
                caLength: certificates.ca ? certificates.ca.length : 0
            },
            tlsOptions: {
                minVersion: tlsOptions.minVersion,
                maxVersion: tlsOptions.maxVersion,
                ciphers: tlsOptions.ciphers?.substring(0, 50) + '...' // Truncate long cipher list
            }
        });
        // Create the TLS server
        const server = new plugins.tls.Server(tlsOptions);
        // Set up error handlers
        server.on('error', (err) => {
            SmtpLogger.error(`Secure server error: ${err.message}`, {
                component: 'secure-server',
                error: err,
                stack: err.stack
            });
        });
        // Log secure connections
        server.on('secureConnection', (socket) => {
            const protocol = socket.getProtocol();
            const cipher = socket.getCipher();
            SmtpLogger.info('New direct TLS connection established', {
                component: 'secure-server',
                remoteAddress: socket.remoteAddress,
                remotePort: socket.remotePort,
                protocol: protocol || 'unknown',
                cipher: cipher?.name || 'unknown'
            });
        });
        return server;
    }
    catch (error) {
        SmtpLogger.error(`Failed to create secure TLS server: ${error instanceof Error ? error.message : String(error)}`, {
            component: 'secure-server',
            error: error instanceof Error ? error : new Error(String(error)),
            stack: error instanceof Error ? error.stack : 'No stack trace available'
        });
        return undefined;
    }
}
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