import { spawnSync } from "child_process";
import path from "path";

const CONTAINER_PATH = "/workspace";

// Maps container path prefixes to host paths.
// Derived from docker-compose.yml volumes:
//   ./workspace   -> /workspace
//   ./claude-home -> /home/claude
// Override host paths via env vars when running outside the default layout.
const VOLUME_MAP = {
	"/workspace":    process.env.CONDUIT_HOST_WORKSPACE  || CONTAINER_PATH,
	"/home/claude":  process.env.CONDUIT_HOST_HOME       || "/home/claude",
};

// Translate a container-side path to its host-side equivalent using VOLUME_MAP.
// Relative paths are resolved against CONTAINER_PATH first.
// Throws if the path escapes all known volumes.
export function resolve_path(user_path) {
	const abs = path.isAbsolute(user_path)
		? user_path
		: path.join(CONTAINER_PATH, user_path);

	for (const [container_prefix, host_prefix] of Object.entries(VOLUME_MAP)) {
		if (abs === container_prefix || abs.startsWith(container_prefix + "/")) {
			const relative = abs.slice(container_prefix.length);
			return host_prefix + relative;
		}
	}

	throw new Error(`Path is outside all known volumes: ${user_path}`);
}

// Execute a binary with an argument list — no shell interpolation.
export function exec(bin, args = []) {
	return new Promise((resolve, reject) => {
		const result = spawnSync(bin, args, { stdio: "inherit" });
		if (result.error) {
			reject(result.error);
		} else {
			resolve(result.status);
		}
	});
}