import { relative, resolve } from "node:path";

/** True when `candidate` resolves to a path under `rootDir` (not the root dir itself). */
export function isPathInsideRoot(rootDir: string, candidate: string): boolean {
	const root = resolve(rootDir);
	const target = resolve(candidate);
	const rel = relative(root, target);
	if (rel === "" || rel === ".") return false;
	if (rel.startsWith("..")) return false;
	// Cross-drive relative paths on Windows are absolute (e.g. D:\other\...)
	if (/^[A-Za-z]:[\\/]/.test(rel)) return false;
	return true;
}

export function isSameResolvedPath(a: string, b: string): boolean {
	const left = resolve(a);
	const right = resolve(b);
	if (process.platform === "win32") {
		return left.toLowerCase() === right.toLowerCase();
	}
	return left === right;
}