// QUIC Transport Layer for Agentic Flow
// WebAssembly-based QUIC client/server with connection pooling and stream multiplexing
import { logger } from '../utils/logger.js';
/**
 * QUIC Client - Manages outbound QUIC connections and stream multiplexing
 */
export class QuicClient {
    config;
    connections;
    wasmModule; // WASM module reference
    initialized;
    constructor(config = {}) {
        this.config = {
            host: config.host || '0.0.0.0',
            port: config.port || 4433,
            certPath: config.certPath || './certs/cert.pem',
            keyPath: config.keyPath || './certs/key.pem',
            serverHost: config.serverHost || 'localhost',
            serverPort: config.serverPort || 4433,
            verifyPeer: config.verifyPeer ?? true,
            maxConnections: config.maxConnections || 100,
            connectionTimeout: config.connectionTimeout || 30000,
            idleTimeout: config.idleTimeout || 60000,
            maxConcurrentStreams: config.maxConcurrentStreams || 100,
            streamTimeout: config.streamTimeout || 30000,
            initialCongestionWindow: config.initialCongestionWindow || 10,
            maxDatagramSize: config.maxDatagramSize || 1200,
            enableEarlyData: config.enableEarlyData ?? true
        };
        this.connections = new Map();
        this.initialized = false;
    }
    /**
     * Initialize QUIC client with WASM module
     */
    async initialize() {
        if (this.initialized) {
            logger.warn('QUIC client already initialized');
            return;
        }
        try {
            logger.info('Initializing QUIC client...', {
                serverHost: this.config.serverHost,
                serverPort: this.config.serverPort,
                verifyPeer: this.config.verifyPeer
            });
            // Load WASM module (implementation depends on WASM binding)
            // For now, this is a placeholder for the actual WASM loading
            this.wasmModule = await this.loadWasmModule();
            this.initialized = true;
            logger.info('QUIC client initialized successfully');
        }
        catch (error) {
            logger.error('Failed to initialize QUIC client', { error });
            throw error;
        }
    }
    /**
     * Connect to QUIC server
     */
    async connect(host, port) {
        if (!this.initialized) {
            throw new Error('QUIC client not initialized. Call initialize() first.');
        }
        const targetHost = host || this.config.serverHost;
        const targetPort = port || this.config.serverPort;
        const connectionId = `${targetHost}:${targetPort}`;
        // Check if connection already exists
        if (this.connections.has(connectionId)) {
            const conn = this.connections.get(connectionId);
            conn.lastActivity = new Date();
            logger.debug('Reusing existing QUIC connection', { connectionId });
            return conn;
        }
        // Check connection pool limit
        if (this.connections.size >= this.config.maxConnections) {
            throw new Error(`Maximum connections (${this.config.maxConnections}) reached`);
        }
        try {
            logger.info('Establishing QUIC connection', { host: targetHost, port: targetPort });
            // Establish QUIC connection via WASM
            // This is a placeholder - actual implementation will use WASM bindings
            const connection = {
                id: connectionId,
                remoteAddr: `${targetHost}:${targetPort}`,
                streamCount: 0,
                createdAt: new Date(),
                lastActivity: new Date()
            };
            this.connections.set(connectionId, connection);
            logger.info('QUIC connection established', { connectionId });
            return connection;
        }
        catch (error) {
            logger.error('Failed to establish QUIC connection', { error, host: targetHost, port: targetPort });
            throw error;
        }
    }
    /**
     * Create bidirectional stream on connection
     */
    async createStream(connectionId) {
        const connection = this.connections.get(connectionId);
        if (!connection) {
            throw new Error(`Connection ${connectionId} not found`);
        }
        if (connection.streamCount >= this.config.maxConcurrentStreams) {
            throw new Error(`Maximum concurrent streams (${this.config.maxConcurrentStreams}) reached`);
        }
        const streamId = connection.streamCount++;
        connection.lastActivity = new Date();
        logger.debug('Creating QUIC stream', { connectionId, streamId });
        // Create stream via WASM
        const stream = {
            id: streamId,
            connectionId,
            send: async (data) => {
                logger.debug('Sending data on stream', { connectionId, streamId, bytes: data.length });
                // WASM call to send data
                connection.lastActivity = new Date();
            },
            receive: async () => {
                logger.debug('Receiving data on stream', { connectionId, streamId });
                // WASM call to receive data
                connection.lastActivity = new Date();
                return new Uint8Array(); // Placeholder
            },
            close: async () => {
                logger.debug('Closing stream', { connectionId, streamId });
                connection.streamCount--;
                connection.lastActivity = new Date();
            }
        };
        return stream;
    }
    /**
     * Send HTTP/3 request over QUIC
     */
    async sendRequest(connectionId, method, path, headers, body) {
        const stream = await this.createStream(connectionId);
        try {
            // Encode HTTP/3 request
            const request = this.encodeHttp3Request(method, path, headers, body);
            await stream.send(request);
            // Receive HTTP/3 response
            const responseData = await stream.receive();
            const response = this.decodeHttp3Response(responseData);
            return response;
        }
        finally {
            await stream.close();
        }
    }
    /**
     * Close connection
     */
    async closeConnection(connectionId) {
        const connection = this.connections.get(connectionId);
        if (!connection) {
            logger.warn('Connection not found', { connectionId });
            return;
        }
        logger.info('Closing QUIC connection', { connectionId });
        // WASM call to close connection
        this.connections.delete(connectionId);
    }
    /**
     * Close all connections and cleanup
     */
    async shutdown() {
        logger.info('Shutting down QUIC client', { activeConnections: this.connections.size });
        for (const connectionId of this.connections.keys()) {
            await this.closeConnection(connectionId);
        }
        this.initialized = false;
    }
    /**
     * Get connection statistics
     */
    getStats() {
        return {
            totalConnections: this.connections.size,
            activeConnections: this.connections.size,
            totalStreams: Array.from(this.connections.values()).reduce((sum, c) => sum + c.streamCount, 0),
            activeStreams: Array.from(this.connections.values()).reduce((sum, c) => sum + c.streamCount, 0),
            bytesReceived: 0, // From WASM
            bytesSent: 0, // From WASM
            packetsLost: 0, // From WASM
            rttMs: 0 // From WASM
        };
    }
    /**
     * Load WASM module (placeholder)
     */
    async loadWasmModule() {
        // This will be implemented to load the actual WASM module
        // For now, return a mock object
        logger.debug('Loading QUIC WASM module...');
        return {};
    }
    /**
     * Encode HTTP/3 request (placeholder)
     */
    encodeHttp3Request(method, path, headers, body) {
        // HTTP/3 QPACK encoding will be implemented
        logger.debug('Encoding HTTP/3 request', { method, path, headers });
        return new Uint8Array();
    }
    /**
     * Decode HTTP/3 response (placeholder)
     */
    decodeHttp3Response(data) {
        // HTTP/3 QPACK decoding will be implemented
        logger.debug('Decoding HTTP/3 response', { bytes: data.length });
        return {
            status: 200,
            headers: {},
            body: new Uint8Array()
        };
    }
}
/**
 * QUIC Server - Listens for inbound QUIC connections
 */
export class QuicServer {
    config;
    connections;
    wasmModule;
    initialized;
    listening;
    constructor(config = {}) {
        this.config = {
            host: config.host || '0.0.0.0',
            port: config.port || 4433,
            certPath: config.certPath || './certs/cert.pem',
            keyPath: config.keyPath || './certs/key.pem',
            serverHost: config.serverHost || 'localhost',
            serverPort: config.serverPort || 4433,
            verifyPeer: config.verifyPeer ?? false,
            maxConnections: config.maxConnections || 1000,
            connectionTimeout: config.connectionTimeout || 30000,
            idleTimeout: config.idleTimeout || 120000,
            maxConcurrentStreams: config.maxConcurrentStreams || 100,
            streamTimeout: config.streamTimeout || 30000,
            initialCongestionWindow: config.initialCongestionWindow || 10,
            maxDatagramSize: config.maxDatagramSize || 1200,
            enableEarlyData: config.enableEarlyData ?? false
        };
        this.connections = new Map();
        this.initialized = false;
        this.listening = false;
    }
    /**
     * Initialize QUIC server
     */
    async initialize() {
        if (this.initialized) {
            logger.warn('QUIC server already initialized');
            return;
        }
        try {
            logger.info('Initializing QUIC server...', {
                host: this.config.host,
                port: this.config.port,
                certPath: this.config.certPath
            });
            // Load WASM module
            this.wasmModule = await this.loadWasmModule();
            this.initialized = true;
            logger.info('QUIC server initialized successfully');
        }
        catch (error) {
            logger.error('Failed to initialize QUIC server', { error });
            throw error;
        }
    }
    /**
     * Start listening for connections
     */
    async listen() {
        if (!this.initialized) {
            throw new Error('QUIC server not initialized. Call initialize() first.');
        }
        if (this.listening) {
            logger.warn('QUIC server already listening');
            return;
        }
        try {
            logger.info('Starting QUIC server', { host: this.config.host, port: this.config.port });
            // Start QUIC server via WASM
            // This will be implemented with actual WASM bindings
            this.listening = true;
            logger.info(`QUIC server listening on ${this.config.host}:${this.config.port}`);
        }
        catch (error) {
            logger.error('Failed to start QUIC server', { error });
            throw error;
        }
    }
    /**
     * Stop server and close all connections
     */
    async stop() {
        if (!this.listening) {
            logger.warn('QUIC server not listening');
            return;
        }
        logger.info('Stopping QUIC server', { activeConnections: this.connections.size });
        // Close all connections
        for (const connectionId of this.connections.keys()) {
            await this.closeConnection(connectionId);
        }
        // Stop listening via WASM
        this.listening = false;
        logger.info('QUIC server stopped');
    }
    /**
     * Close connection
     */
    async closeConnection(connectionId) {
        const connection = this.connections.get(connectionId);
        if (!connection) {
            logger.warn('Connection not found', { connectionId });
            return;
        }
        logger.info('Closing connection', { connectionId });
        this.connections.delete(connectionId);
    }
    /**
     * Get server statistics
     */
    getStats() {
        return {
            totalConnections: this.connections.size,
            activeConnections: this.connections.size,
            totalStreams: Array.from(this.connections.values()).reduce((sum, c) => sum + c.streamCount, 0),
            activeStreams: Array.from(this.connections.values()).reduce((sum, c) => sum + c.streamCount, 0),
            bytesReceived: 0,
            bytesSent: 0,
            packetsLost: 0,
            rttMs: 0
        };
    }
    /**
     * Load WASM module (placeholder)
     */
    async loadWasmModule() {
        logger.debug('Loading QUIC server WASM module...');
        return {};
    }
}
/**
 * Connection pool manager for QUIC connections
 */
export class QuicConnectionPool {
    client;
    connections;
    maxPoolSize;
    constructor(client, maxPoolSize = 10) {
        this.client = client;
        this.connections = new Map();
        this.maxPoolSize = maxPoolSize;
    }
    /**
     * Get or create connection from pool
     */
    async getConnection(host, port) {
        const key = `${host}:${port}`;
        if (this.connections.has(key)) {
            const conn = this.connections.get(key);
            conn.lastActivity = new Date();
            return conn;
        }
        if (this.connections.size >= this.maxPoolSize) {
            // Remove oldest idle connection
            this.removeOldestConnection();
        }
        const connection = await this.client.connect(host, port);
        this.connections.set(key, connection);
        return connection;
    }
    /**
     * Remove oldest idle connection
     */
    removeOldestConnection() {
        let oldestKey = null;
        let oldestTime = Date.now();
        for (const [key, conn] of this.connections.entries()) {
            const lastActivity = conn.lastActivity.getTime();
            if (lastActivity < oldestTime) {
                oldestTime = lastActivity;
                oldestKey = key;
            }
        }
        if (oldestKey) {
            this.client.closeConnection(oldestKey);
            this.connections.delete(oldestKey);
            logger.debug('Removed idle connection from pool', { connectionId: oldestKey });
        }
    }
    /**
     * Clear all connections in pool
     */
    async clear() {
        for (const connectionId of this.connections.keys()) {
            await this.client.closeConnection(connectionId);
        }
        this.connections.clear();
    }
}
export class QuicTransport {
    client;
    config;
    constructor(config = {}) {
        this.config = config;
        this.client = new QuicClient({
            serverHost: config.host || 'localhost',
            serverPort: config.port || 4433,
            maxConcurrentStreams: config.maxConcurrentStreams || 100,
            certPath: config.certPath,
            keyPath: config.keyPath
        });
    }
    /**
     * Connect to QUIC server
     */
    async connect() {
        await this.client.initialize();
        await this.client.connect();
    }
    /**
     * Send data over QUIC
     */
    async send(data) {
        // Convert data to bytes and send
        const jsonStr = JSON.stringify(data);
        const bytes = new TextEncoder().encode(jsonStr);
        // Implementation will use QUIC client to send
        logger.debug('Sending data via QUIC', { bytes: bytes.length });
    }
    /**
     * Close connection
     */
    async close() {
        await this.client.shutdown();
    }
    /**
     * Get connection statistics
     */
    getStats() {
        return this.client.getStats();
    }
}
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