// QUIC-enabled Proxy for Anthropic API
// Optional QUIC transport with automatic HTTP/2 fallback
import { QuicClient, QuicConnectionPool } from '../transport/quic.js';
import { logger } from '../utils/logger.js';
import { AnthropicToOpenRouterProxy } from './anthropic-to-openrouter.js';
export class QuicEnabledProxy extends AnthropicToOpenRouterProxy {
    quicClient;
    quicPool;
    transport;
    quicEnabled;
    fallbackToHttp2;
    constructor(config) {
        super({
            openrouterApiKey: config.openrouterApiKey,
            openrouterBaseUrl: config.openrouterBaseUrl,
            defaultModel: config.defaultModel
        });
        this.transport = config.transport || 'auto';
        this.quicEnabled = config.enableQuic ?? this.checkQuicFeatureFlag();
        this.fallbackToHttp2 = config.fallbackToHttp2 ?? true;
        if (this.quicEnabled) {
            this.initializeQuic(config.quic || {});
        }
    }
    /**
     * Check if QUIC is enabled via environment variable
     */
    checkQuicFeatureFlag() {
        const flag = process.env.AGENTIC_FLOW_ENABLE_QUIC;
        return flag === 'true' || flag === '1';
    }
    /**
     * Initialize QUIC client and connection pool
     */
    async initializeQuic(quicConfig) {
        try {
            logger.info('Initializing QUIC transport...', { config: quicConfig });
            this.quicClient = new QuicClient(quicConfig);
            await this.quicClient.initialize();
            this.quicPool = new QuicConnectionPool(this.quicClient, 20);
            logger.info('QUIC transport initialized successfully');
        }
        catch (error) {
            logger.error('Failed to initialize QUIC transport', { error });
            if (this.fallbackToHttp2) {
                logger.warn('Falling back to HTTP/2 transport');
                this.quicEnabled = false;
            }
            else {
                throw error;
            }
        }
    }
    /**
     * Select transport protocol based on configuration and availability
     */
    selectTransport() {
        if (this.transport === 'quic' && this.quicEnabled) {
            return 'quic';
        }
        if (this.transport === 'http2') {
            return 'http2';
        }
        // Auto mode: prefer QUIC if available, fallback to HTTP/2
        if (this.transport === 'auto') {
            return this.quicEnabled ? 'quic' : 'http2';
        }
        return 'http2';
    }
    /**
     * Send request using selected transport
     */
    async sendRequest(url, options) {
        const selectedTransport = this.selectTransport();
        logger.debug('Sending request', {
            transport: selectedTransport,
            url,
            method: options.method
        });
        if (selectedTransport === 'quic') {
            return this.sendQuicRequest(url, options);
        }
        else {
            return this.sendHttp2Request(url, options);
        }
    }
    /**
     * Send request over QUIC
     */
    async sendQuicRequest(url, options) {
        if (!this.quicClient || !this.quicPool) {
            throw new Error('QUIC client not initialized');
        }
        try {
            const urlObj = new URL(url);
            const connection = await this.quicPool.getConnection(urlObj.hostname, parseInt(urlObj.port) || 443);
            logger.debug('Using QUIC connection', {
                connectionId: connection.id,
                url
            });
            // Prepare headers
            const headers = {};
            if (options.headers) {
                const headerEntries = options.headers instanceof Headers
                    ? Array.from(options.headers.entries())
                    : Object.entries(options.headers);
                for (const [key, value] of headerEntries) {
                    headers[key] = value;
                }
            }
            // Convert body to Uint8Array
            let body;
            if (options.body) {
                if (typeof options.body === 'string') {
                    body = new TextEncoder().encode(options.body);
                }
                else if (options.body instanceof Uint8Array) {
                    body = options.body;
                }
                else {
                    body = new TextEncoder().encode(JSON.stringify(options.body));
                }
            }
            // Send HTTP/3 request over QUIC
            const response = await this.quicClient.sendRequest(connection.id, options.method || 'GET', urlObj.pathname + urlObj.search, headers, body);
            logger.info('QUIC request completed', {
                status: response.status,
                bytes: response.body.length
            });
            // Convert to fetch Response
            const responseText = new TextDecoder().decode(response.body);
            return new Response(responseText, {
                status: response.status,
                headers: new Headers(response.headers)
            });
        }
        catch (error) {
            logger.error('QUIC request failed', { error, url });
            if (this.fallbackToHttp2) {
                logger.warn('Falling back to HTTP/2 for this request');
                return this.sendHttp2Request(url, options);
            }
            throw error;
        }
    }
    /**
     * Send request over HTTP/2 (standard fetch)
     */
    async sendHttp2Request(url, options) {
        logger.debug('Using HTTP/2 transport', { url });
        return fetch(url, options);
    }
    /**
     * Get transport statistics
     */
    getTransportStats() {
        if (this.quicClient) {
            return {
                transport: this.selectTransport(),
                quicEnabled: this.quicEnabled,
                quicStats: this.quicClient.getStats()
            };
        }
        return {
            transport: 'http2',
            quicEnabled: false
        };
    }
    /**
     * Shutdown and cleanup
     */
    async shutdown() {
        if (this.quicPool) {
            await this.quicPool.clear();
        }
        if (this.quicClient) {
            await this.quicClient.shutdown();
        }
        logger.info('QUIC proxy shutdown complete');
    }
}
/**
 * Create QUIC-enabled proxy with configuration
 */
export function createQuicProxy(config) {
    const proxy = new QuicEnabledProxy(config);
    logger.info('QUIC proxy created', {
        transport: config.transport || 'auto',
        quicEnabled: config.enableQuic ?? (process.env.AGENTIC_FLOW_ENABLE_QUIC === 'true'),
        fallbackEnabled: config.fallbackToHttp2 ?? true
    });
    return proxy;
}
// CLI entry point for QUIC proxy
if (import.meta.url === `file://${process.argv[1]}`) {
    const port = parseInt(process.env.PORT || '3000');
    const openrouterApiKey = process.env.OPENROUTER_API_KEY;
    if (!openrouterApiKey) {
        console.error('❌ Error: OPENROUTER_API_KEY environment variable required');
        process.exit(1);
    }
    const proxy = createQuicProxy({
        openrouterApiKey,
        openrouterBaseUrl: process.env.ANTHROPIC_PROXY_BASE_URL,
        defaultModel: process.env.COMPLETION_MODEL || process.env.REASONING_MODEL,
        transport: process.env.TRANSPORT || 'auto',
        enableQuic: process.env.AGENTIC_FLOW_ENABLE_QUIC === 'true',
        quic: {
            port: parseInt(process.env.QUIC_PORT || '4433'),
            serverHost: process.env.QUIC_HOST || 'localhost',
            certPath: process.env.QUIC_CERT_PATH,
            keyPath: process.env.QUIC_KEY_PATH
        }
    });
    proxy.start(port);
    // Graceful shutdown
    process.on('SIGTERM', async () => {
        logger.info('Received SIGTERM, shutting down gracefully...');
        await proxy.shutdown();
        process.exit(0);
    });
    process.on('SIGINT', async () => {
        logger.info('Received SIGINT, shutting down gracefully...');
        await proxy.shutdown();
        process.exit(0);
    });
}
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