"use strict";

const path = require("path");

function existsSync(p) {
	try {
		// eslint-disable-next-line n/no-sync
		return require("fs").existsSync(p);
	} catch (_) {
		return false;
	}
}

function isDirectorySync(p) {
	try {
		// eslint-disable-next-line n/no-sync
		return require("fs").statSync(p).isDirectory();
	} catch (_) {
		return false;
	}
}

function findRoot(startPath) {
	if (!startPath || typeof startPath !== "string") return null;

	// Handle URIs (atom://...) and file:// style strings conservatively.
	if (startPath.startsWith("atom://")) return null;
	let current = startPath;
	if (current.startsWith("file://")) current = current.replace(/^file:\/\//, "");

	// If it's a file, walk from its directory.
	try {
		if (existsSync(current) && !current.endsWith(path.sep)) {
			const stat = require("fs").statSync(current);
			if (stat && stat.isFile()) current = path.dirname(current);
		}
	} catch (_) {
		current = path.dirname(current);
	}

	// Prefer `find-root` if available (it is in the SDK dependency tree).
	try {
		const findRootPkg = require("find-root");
		return findRootPkg(current);
	} catch (_) {
		// Fall back to a simple package.json search.
	}

	let dir = current;
	while (dir && dir !== path.dirname(dir)) {
		if (existsSync(path.join(dir, "package.json"))) return dir;
		// Jibo SDK projects also commonly have a top-level `src/`.
		if (isDirectorySync(path.join(dir, "src"))) return dir;
		dir = path.dirname(dir);
	}
	return null;
}

module.exports = { findRoot };