// Minimal MCP stdio server for verifying the dsh-mcp-client bridge.
// Exposes one tool `echo` (returns its `message` argument) using the
// @modelcontextprotocol/sdk vendored with the local dsh installation.
// Imports use absolute file URLs so the script resolves the SDK from
// the dsh profiles junction farm; the SDK's own `zod` import resolves
// from the same farm.
//
// Run directly (`node server.mjs`) it serves MCP over stdio for the
// dsh-mcp-client bridge. Imported as a module it exports createServer()
// so tests can drive the real handlers over InMemoryTransport.
import { McpServer } from "file:///C:/Users/12914/.dsh/profiles/node_modules/@modelcontextprotocol/sdk/dist/esm/server/mcp.js";
import { StdioServerTransport } from "file:///C:/Users/12914/.dsh/profiles/node_modules/@modelcontextprotocol/sdk/dist/esm/server/stdio.js";
import { z } from "file:///C:/Users/12914/.dsh/profiles/node_modules/zod/index.js";
import { pathToFileURL } from "node:url";

export function createServer() {
	const server = new McpServer({
		name: "dsh-demo",
		version: "0.1.0"
	});

	server.registerTool("echo", {
		title: "Echo",
		description: "Returns the message it was given, prefixed with 'echo:'.",
		inputSchema: {
			message: z.string().describe("Text to echo back.")
		}
	}, async ({ message }) => ({
		content: [{ type: "text", text: `echo: ${message}` }]
	}));

	return server;
}

const isMain = process.argv[1] !== undefined
	&& import.meta.url === pathToFileURL(process.argv[1]).href;

if (isMain) {
	const server = createServer();
	await server.connect(new StdioServerTransport());
}