export function activate() {

    const isWindows = os.platform() === 'win32';
    const socketPath = isWindows ? '\\\\.\\pipe\\hello-world' : path.join(os.tmpdir(), 'hello-world.sock');

    const socketUri = vscode.Uri.from({
        scheme: isWindows ? 'pipe' : 'unix',
        path: socketPath,
        fragment: '/mcp' // The express app below is configured to serve MCP over the `/mcp` route
    });

    vscode.lm.registerMcpServerDefinitionProvider('hello-world', {
        provideMcpServerDefinitions(token: vscode.CancellationToken): vscode.McpServerDefinition[] {
            return [
                new vscode.McpHttpServerDefinition(
                    'hello-world',
                    socketUri,
                ),
            ];
        },
        resolveMcpServerDefinition(server: vscode.McpServerDefinition, token: vscode.CancellationToken): vscode.McpServerDefinition {
            startMcpServer(socketPath); // Additionally, the server should also be closed on extension deactivation
            return server;
        }
    });

}

function startMcpServer(socketPath: string) {
    // Uses express, same as the MCP TypeScript SDK examples
    const app = express();

    // MCP StreamableHTTP server setup, refer to examples at https://www.npmjs.com/package/@modelcontextprotocol/sdk#streamable-http
    // ...

    // Listen on the socket/named pipe
    app.listen(socketPath);
}