// QUIC Configuration Schema
// Validates and manages QUIC transport configuration
import { logger } from '../utils/logger.js';
/**
 * Default QUIC configuration
 */
export const DEFAULT_QUIC_CONFIG = {
    enabled: false,
    autoDetect: true,
    fallbackToHttp2: true,
    // Connection settings
    host: '0.0.0.0',
    port: 4433,
    serverHost: 'localhost',
    serverPort: 4433,
    verifyPeer: true,
    // TLS certificates
    certPath: './certs/cert.pem',
    keyPath: './certs/key.pem',
    // Connection pool
    maxConnections: 100,
    connectionTimeout: 30000,
    idleTimeout: 60000,
    // Stream multiplexing
    maxConcurrentStreams: 100,
    streamTimeout: 30000,
    // Performance tuning
    initialCongestionWindow: 10,
    maxDatagramSize: 1200,
    enableEarlyData: true,
    // Health check
    healthCheck: {
        enabled: true,
        interval: 30000, // 30 seconds
        timeout: 5000 // 5 seconds
    },
    // Monitoring
    monitoring: {
        enabled: true,
        logInterval: 60000 // 1 minute
    }
};
/**
 * Load QUIC configuration from environment and config file
 */
export function loadQuicConfig(overrides = {}) {
    const config = {
        ...DEFAULT_QUIC_CONFIG,
        ...overrides
    };
    // Environment variable overrides
    if (process.env.AGENTIC_FLOW_ENABLE_QUIC !== undefined) {
        config.enabled = process.env.AGENTIC_FLOW_ENABLE_QUIC === 'true';
    }
    if (process.env.QUIC_PORT) {
        config.port = parseInt(process.env.QUIC_PORT);
    }
    if (process.env.QUIC_HOST) {
        config.host = process.env.QUIC_HOST;
    }
    if (process.env.QUIC_SERVER_HOST) {
        config.serverHost = process.env.QUIC_SERVER_HOST;
    }
    if (process.env.QUIC_SERVER_PORT) {
        config.serverPort = parseInt(process.env.QUIC_SERVER_PORT);
    }
    if (process.env.QUIC_CERT_PATH) {
        config.certPath = process.env.QUIC_CERT_PATH;
    }
    if (process.env.QUIC_KEY_PATH) {
        config.keyPath = process.env.QUIC_KEY_PATH;
    }
    if (process.env.QUIC_MAX_CONNECTIONS) {
        config.maxConnections = parseInt(process.env.QUIC_MAX_CONNECTIONS);
    }
    if (process.env.QUIC_MAX_STREAMS) {
        config.maxConcurrentStreams = parseInt(process.env.QUIC_MAX_STREAMS);
    }
    if (process.env.QUIC_VERIFY_PEER !== undefined) {
        config.verifyPeer = process.env.QUIC_VERIFY_PEER === 'true';
    }
    // Validate configuration
    validateQuicConfig(config);
    logger.info('QUIC configuration loaded', {
        enabled: config.enabled,
        host: config.host,
        port: config.port,
        maxConnections: config.maxConnections,
        healthCheckEnabled: config.healthCheck.enabled
    });
    return config;
}
/**
 * Validate QUIC configuration
 */
export function validateQuicConfig(config) {
    const errors = [];
    // Port validation
    if (config.port < 1 || config.port > 65535) {
        errors.push(`Invalid port: ${config.port}. Must be between 1 and 65535.`);
    }
    if (config.serverPort < 1 || config.serverPort > 65535) {
        errors.push(`Invalid server port: ${config.serverPort}. Must be between 1 and 65535.`);
    }
    // Connection limits
    if (config.maxConnections < 1) {
        errors.push(`Invalid maxConnections: ${config.maxConnections}. Must be at least 1.`);
    }
    if (config.maxConcurrentStreams < 1) {
        errors.push(`Invalid maxConcurrentStreams: ${config.maxConcurrentStreams}. Must be at least 1.`);
    }
    // Timeouts
    if (config.connectionTimeout < 1000) {
        errors.push(`Invalid connectionTimeout: ${config.connectionTimeout}. Must be at least 1000ms.`);
    }
    if (config.idleTimeout < 1000) {
        errors.push(`Invalid idleTimeout: ${config.idleTimeout}. Must be at least 1000ms.`);
    }
    if (config.streamTimeout < 1000) {
        errors.push(`Invalid streamTimeout: ${config.streamTimeout}. Must be at least 1000ms.`);
    }
    // Performance tuning
    if (config.initialCongestionWindow < 1) {
        errors.push(`Invalid initialCongestionWindow: ${config.initialCongestionWindow}. Must be at least 1.`);
    }
    if (config.maxDatagramSize < 1200 || config.maxDatagramSize > 65527) {
        errors.push(`Invalid maxDatagramSize: ${config.maxDatagramSize}. Must be between 1200 and 65527.`);
    }
    // TLS certificates (warn only)
    if (config.enabled && config.verifyPeer) {
        const fs = require('fs');
        if (!fs.existsSync(config.certPath)) {
            logger.warn(`Certificate not found: ${config.certPath}`);
        }
        if (!fs.existsSync(config.keyPath)) {
            logger.warn(`Private key not found: ${config.keyPath}`);
        }
    }
    if (errors.length > 0) {
        const errorMessage = `QUIC configuration validation failed:\n${errors.join('\n')}`;
        logger.error(errorMessage);
        throw new Error(errorMessage);
    }
}
/**
 * Get QUIC configuration for router integration
 */
export function getQuicRouterConfig(config) {
    return {
        transport: {
            quic: {
                enabled: config.enabled,
                port: config.port,
                host: config.host,
                maxConnections: config.maxConnections,
                certPath: config.certPath,
                keyPath: config.keyPath
            },
            fallback: {
                enabled: config.fallbackToHttp2,
                protocol: 'http2'
            }
        }
    };
}
/**
 * Check if QUIC is available and properly configured
 */
export async function checkQuicAvailability() {
    try {
        // Check if WASM module is available
        // This will be implemented when WASM module is integrated
        const wasmAvailable = true; // Placeholder
        if (!wasmAvailable) {
            return {
                available: false,
                reason: 'QUIC WASM module not available'
            };
        }
        // Check if certificates exist (for server mode)
        const config = loadQuicConfig();
        if (config.enabled && config.verifyPeer) {
            const fs = require('fs');
            if (!fs.existsSync(config.certPath) || !fs.existsSync(config.keyPath)) {
                return {
                    available: false,
                    reason: 'TLS certificates not found'
                };
            }
        }
        return { available: true };
    }
    catch (error) {
        logger.error('Error checking QUIC availability', { error });
        return {
            available: false,
            reason: error.message
        };
    }
}
/**
 * Simplified config getter (alias for loadQuicConfig)
 */
export function getQuicConfig(overrides = {}) {
    return loadQuicConfig(overrides);
}
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