// Node-only ways in, with a context of their own (createNodeContext in a temp state dir) and no call:
// the code may call nothing.
//   transport: for atlibs' Node CLI (ATLIBS_TRANSPORTS=<this repo>/js/cli.mjs): a module that lists
//     com.fedfork.exec.mcp.message in its calls reaches code mode as a host call.
//   node js/cli.mjs: a composition handler for the Rust atlibs CLI (--handler 'mcp=exec:<node> <this file>'
//     --allow-exec): the handler envelope { handler, caller, nsid, reason, input } on stdin, the response on stdout.
import { mkdtempSync, rmSync } from "node:fs";
import { tmpdir } from "node:os";
import { join } from "node:path";
import { pathToFileURL } from "node:url";

import { createNodeContext } from "@publicdomainrelay/atlibs/server/index.js";
import { MESSAGE, codeMode } from "./index.js";

const server = (stateDir) => codeMode({ ctx: createNodeContext({ id: "code-mode", stateDir }) });

export const transport = { [MESSAGE]: ({ stateDir }) => server(join(stateDir, "code-mode")).calls[MESSAGE] };

if (import.meta.url === pathToFileURL(process.argv[1]).href) {
	let body = "";
	for await (const chunk of process.stdin) body += chunk;
	const { input } = JSON.parse(body);
	const stateDir = mkdtempSync(join(tmpdir(), "code-mode-"));
	try {
		process.stdout.write(`${JSON.stringify(await server(stateDir).message(input))}\n`);
	} finally {
		rmSync(stateDir, { recursive: true, force: true });
	}
	process.exit(0);
}