import { exec as execCb } from 'node:child_process';
import * as fs from 'node:fs/promises';
import * as os from 'node:os';
import * as path from 'node:path';
import { env } from 'node:process';
import { promisify } from 'node:util';

const exec = promisify(execCb);

/**
 * @param {string} progName
 * @returns {Promise<boolean>}
 */
async function where(progName) {
	// Reject paths
	if (/[\\]/.test(progName)) return false;
	try {
		await exec(`where "${progName}"`);
	} catch {
		return false;
	}

	return true;
}

/**
 * @param {string} progName
 * @returns {Promise<boolean>}
 */
export async function which(progName) {
	return os.type() === 'Windows_NT'
		? where(progName)
		: Promise.any(
				Array.from(new Set(env.PATH?.split(':'))).map((dir) =>
					fs.access(path.join(dir, progName), fs.constants.X_OK)
				)
		  ).then(
				() => true,
				() => false
		  );
}