module.exports = isexe;
isexe.sync = sync;

var fs = require('fs');

function isexe(path, options, cb) {
  fs.stat(path, function (er, stat) {
    cb(er, er ? false : checkStat(stat, options));
  });
}

function sync(path, options) {
  return checkStat(fs.statSync(path), options);
}

function checkStat(stat, options) {
  return stat.isFile() && checkMode(stat, options);
}

function checkMode(stat, options) {
  var mod = stat.mode;
  var uid = stat.uid;
  var gid = stat.gid;

  var myUid =
    options.uid !== undefined ?
      options.uid
    : process.getuid && process.getuid();
  var myGid =
    options.gid !== undefined ?
      options.gid
    : process.getgid && process.getgid();

  var u = parseInt('100', 8);
  var g = parseInt('010', 8);
  var o = parseInt('001', 8);
  var ug = u | g;

  var ret =
    mod & o ||
    (mod & g && gid === myGid) ||
    (mod & u && uid === myUid) ||
    (mod & ug && myUid === 0);

  return ret;
}