#!/usr/bin/env node

/**
 * HTTP MCP Client Bridge
 * Acts as a bridge between:
 * - HTTP Server (StreamableHTTPServerTransport at /mcp endpoint)
 * - Claude Code (via stdio)
 * 
 * Usage: node http-mcp-client.js <url> [--header name:value] ...
 * Example: node http-mcp-client.js http://localhost:3000/mcp --header X-Acai-Token:abc123
 */

import { StreamableHTTPClientTransport } from "@modelcontextprotocol/sdk/client/http.js";
import { StdioClientTransport } from "@modelcontextprotocol/sdk/client/stdio.js";
import { Client } from "@modelcontextprotocol/sdk/client/index.js";

async function main() {
    const args = process.argv.slice(2);
    
    if (args.length === 0) {
        console.error("Usage: node http-mcp-client.js <url> [--header name:value] ...");
        console.error("Example: node http-mcp-client.js http://localhost:3000/mcp --header X-Acai-Token:abc123");
        process.exit(1);
    }

    const url = args[0];
    const headers = {};

    // Parse headers from command line
    for (let i = 1; i < args.length; i += 2) {
        if (args[i] === "--header" && i + 1 < args.length) {
            const [name, value] = args[i + 1].split(":");
            if (name && value) {
                headers[name.trim()] = value.trim();
            }
        }
    }

    console.error(`[HTTP Bridge] Connecting to ${url}`);
    console.error(`[HTTP Bridge] Headers: ${Object.keys(headers).join(", ")}`);

    try {
        // Create StreamableHTTP client transport to connect to our HTTP server
        // This transport supports the modern HTTP/EventStream protocol (2025-03-26)
        const httpTransport = new StreamableHTTPClientTransport(new URL(url), {
            headers
        });

        // Create stdio transport for Claude Code communication
        const stdioTransport = new StdioClientTransport();

        // Create MCP client connected to HTTP server
        const client = new Client({
            name: "acai-http-bridge",
            version: "1.0.0"
        });

        console.error("[HTTP Bridge] Connecting to HTTP server...");
        await client.connect(httpTransport);
        console.error("[HTTP Bridge] Connected to HTTP server successfully");

        // Now bridge the client's tools to Claude Code via stdio
        console.error("[HTTP Bridge] Forwarding tools to Claude Code via stdio...");
        await stdioTransport.start(client);
        console.error("[HTTP Bridge] Bridge active and ready");

    } catch (error) {
        console.error("[HTTP Bridge] ERROR:", error.message);
        if (error.stack) {
            console.error(error.stack);
        }
        process.exit(1);
    }
}

main();