// lvmh worker bridge: headless pi session via SDK; the lvmh plugin (installed
// at /root/.pi/agent/extensions/lvmh-agent.ts) dials the daemon and delivers
// web prompts through pi.sendUserMessage. This process just hosts the session.
// Global npm layout: resolve pi via absolute path (NODE_PATH does not apply to ESM).
import { spawn } from "node:child_process";
import { existsSync } from "node:fs";
import { createAgentSession } from "/usr/local/lib/node_modules/@earendil-works/pi-coding-agent/dist/index.js";

const SETUP_PATH = "/workspace/.lvmh/setup.sh";
const SETUP_TIMEOUT_MS = 10 * 60 * 1000;

// Repo-level setup hook: if the repo ships .lvmh/setup.sh, run it before the
// session starts (apt-get/go install/pip — anything the agent needs).
// /workspace is a persistent per-repo volume, so the hook survives container
// restarts and re-runs on every spawn. Failure is non-fatal: log and continue.
async function runRepoSetup() {
	if (!existsSync(SETUP_PATH)) return;
	console.error(`[lvmh-bridge] running repo setup: ${SETUP_PATH}`);
	const code = await new Promise((resolve) => {
		const child = spawn("bash", [SETUP_PATH], {
			cwd: "/workspace",
			stdio: ["ignore", "inherit", "inherit"],
		});
		const timer = setTimeout(() => {
			console.error(`[lvmh-bridge] setup timed out after ${SETUP_TIMEOUT_MS}ms, killing`);
			child.kill("SIGKILL");
			resolve(124);
		}, SETUP_TIMEOUT_MS);
		timer.unref?.();
		child.on("error", (err) => {
			clearTimeout(timer);
			console.error("[lvmh-bridge] setup spawn error:", err);
			resolve(1);
		});
		child.on("exit", (c) => {
			clearTimeout(timer);
			resolve(c ?? 1);
		});
	});
	if (code === 0) console.error("[lvmh-bridge] setup completed");
	else console.error(`[lvmh-bridge] setup exited ${code} — continuing anyway`);
}

process.on("unhandledRejection", (err) => {
	console.error("[lvmh-bridge] unhandledRejection:", err);
});

try {
	await runRepoSetup();
	const { session } = await createAgentSession();
	// SDK does not bind extensions implicitly (unlike TUI/RPC modes); without
	// bindExtensions the session_start event never fires, so the lvmh plugin
	// would never dial the daemon.
	await session.bindExtensions({ mode: "rpc" });
	console.error(`[lvmh-bridge] session up, cwd=${process.cwd()}`);

	session.subscribe((event) => {
		// Keep the loop warm; the extension does the mirroring.
		if (event.type === "agent_settled") {
			console.error("[lvmh-bridge] agent settled");
		}
	});

	for (const sig of ["SIGTERM", "SIGINT"]) {
		process.on(sig, () => {
			console.error(`[lvmh-bridge] ${sig}, exiting`);
			process.exit(0);
		});
	}
	// Stay alive forever.
	setInterval(() => {}, 1 << 30);
} catch (err) {
	console.error("[lvmh-bridge] failed to create agent session", err);
	process.exit(1);
}