import { statSync } from 'node:fs';

export interface ExecutableSnapshot {
  dev: number;
  ino: number;
  mtimeMs: number;
  size: number;
}

export function snapshotExecutable(execPath: string): ExecutableSnapshot | null {
  try {
    const stat = statSync(execPath);
    return {
      dev: stat.dev,
      ino: stat.ino,
      mtimeMs: stat.mtimeMs,
      size: stat.size,
    };
  } catch {
    return null;
  }
}

export function executableSnapshotChanged(
  initial: ExecutableSnapshot | null,
  current: ExecutableSnapshot | null,
): boolean {
  if (!initial || !current) {
    return false;
  }

  return (
    initial.dev !== current.dev
    || initial.ino !== current.ino
    || initial.mtimeMs !== current.mtimeMs
    || initial.size !== current.size
  );
}