/**
 * v2.3 phase 2: tier-1 fast availability check — is a binary on PATH?
 *
 * Uses execFile (NO shell) because the binary name can come from the provider
 * config file (custom ACP entries) — mirrors the Phase 1 agent-probe hardening.
 * Note: agent-probe's `whichBinary` returns the resolved path (it needs it for
 * `install_path`); this returns a boolean. Kept separate rather than over-
 * refactored into one helper — different return contracts, two short call sites.
 */
import { execFile as execFileCb } from 'node:child_process';
import { promisify } from 'node:util';

const execFile = promisify(execFileCb);

export async function isCommandAvailable(binary: string): Promise<boolean> {
  try {
    const { stdout } = await execFile('which', [binary], { timeout: 10_000 });
    return stdout.trim().length > 0;
  } catch {
    return false;
  }
}