import express from 'express';
import cors from 'cors';
import { createServer } from 'http';
import { Server } from '@modelcontextprotocol/sdk/server/index.js';
import { getVersion } from '../lib/getVersion.js';
import { WebSocketServerTransport } from '../server/websocket.js';
import { onSignals } from '../lib/onSignals.js';
import { serializeCorsOrigin } from '../lib/serializeCorsOrigin.js';
import { loadConfig } from '../lib/config.js';
import { McpServerManager } from '../lib/mcpServerManager.js';
const setResponseHeaders = ({ res, headers, }) => Object.entries(headers).forEach(([key, value]) => {
    res.setHeader(key, value);
});
export async function configToWs(args) {
    const { configPath, port, host, messagePath, logger, corsOrigin, healthEndpoints, headers, } = args;
    logger.info(`  - config: ${configPath}`);
    logger.info(`  - Headers: ${Object.keys(headers).length ? JSON.stringify(headers) : '(none)'}`);
    logger.info(`  - host: ${host}`);
    logger.info(`  - port: ${port}`);
    logger.info(`  - messagePath: ${messagePath}`);
    logger.info(`  - CORS: ${corsOrigin ? `enabled (${serializeCorsOrigin({ corsOrigin })})` : 'disabled'}`);
    logger.info(`  - Health endpoints: ${healthEndpoints.length ? healthEndpoints.join(', ') : '(none)'}`);
    const serverManager = new McpServerManager(logger);
    let wsTransport = null;
    let isReady = false;
    const cleanup = async () => {
        await serverManager.cleanup();
        if (wsTransport) {
            wsTransport.close().catch((err) => {
                logger.error(`Error stopping WebSocket server: ${err.message}`);
            });
        }
    };
    onSignals({ logger, cleanup });
    let config;
    try {
        config = loadConfig(configPath);
        logger.info(`Loaded config with ${Object.keys(config.mcpServers).length} servers`);
    }
    catch (err) {
        logger.error(`Failed to load config: ${err}`);
        process.exit(1);
    }
    for (const [serverName, serverConfig] of Object.entries(config.mcpServers)) {
        try {
            await serverManager.addServer(serverName, serverConfig);
            logger.info(`Successfully initialized server: ${serverName}`);
        }
        catch (err) {
            logger.error(`Failed to initialize server ${serverName}: ${err}`);
            process.exit(1);
        }
    }
    try {
        const server = new Server({ name: 'mcp-superassistant-proxy', version: getVersion() }, { capabilities: {} });
        const app = express();
        if (corsOrigin) {
            app.use(cors({ origin: corsOrigin }));
        }
        for (const ep of healthEndpoints) {
            app.get(ep, (_req, res) => {
                setResponseHeaders({
                    res,
                    headers,
                });
                if (!isReady) {
                    res.status(500).send('Server is not ready');
                }
                else {
                    res.send('ok');
                }
            });
        }
        const httpServer = createServer(app);
        wsTransport = new WebSocketServerTransport({
            path: messagePath,
            server: httpServer,
        });
        await server.connect(wsTransport);
        wsTransport.onmessage = async (message) => {
            // Extract client ID from the modified message ID
            const messageId = message.id;
            let clientId;
            let originalId;
            if (typeof messageId === 'string' && messageId.includes(':')) {
                const parts = messageId.split(':');
                clientId = parts[0];
                originalId = parts.slice(1).join(':');
                message.id = isNaN(Number(originalId))
                    ? originalId
                    : Number(originalId);
            }
            const isRequest = 'method' in message && 'id' in message;
            if (isRequest) {
                logger.info(`WebSocket → Servers (client ${clientId}):`, message);
                try {
                    const response = await serverManager.handleRequest(message);
                    logger.info(`Servers → WebSocket (client ${clientId}):`);
                    logger.debug(`Servers → WebSocket (client ${clientId}):`, response);
                    await wsTransport.send(response, clientId);
                }
                catch (err) {
                    logger.error(`Error handling request from client ${clientId}:`, err);
                    const errorResponse = {
                        jsonrpc: '2.0',
                        id: message.id,
                        error: {
                            code: -32000,
                            message: 'Internal error',
                        },
                    };
                    try {
                        await wsTransport.send(errorResponse, clientId);
                    }
                    catch (sendErr) {
                        logger.error(`Failed to send error response to client ${clientId}:`, sendErr);
                    }
                }
            }
            else {
                logger.info(`Notification from client ${clientId}:`, message);
            }
        };
        wsTransport.onconnection = (clientId) => {
            logger.info(`New WebSocket connection: ${clientId}`);
        };
        wsTransport.ondisconnection = (clientId) => {
            logger.info(`WebSocket connection closed: ${clientId}`);
        };
        wsTransport.onerror = (err) => {
            logger.error(`WebSocket error: ${err.message}`);
        };
        isReady = true;
        httpServer.listen(port, host, () => {
            logger.info(`Listening on ${host}:${port}`);
            logger.info(`WebSocket endpoint: ws://${host}:${port}${messagePath}`);
        });
        logger.info('Config-to-WebSocket gateway ready');
    }
    catch (err) {
        logger.error(`Failed to start: ${err.message}`);
        cleanup();
        process.exit(1);
    }
}
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