const fs = require('fs');

const newLineRegex = /\r?\n/;

function sort(installations, priorities) {
  const defaultPriority = 10;
  // assign priorities
  return installations
    .map((inst) => {
      for (const pair of priorities) {
        if (pair.regex.test(inst)) {
          return { path: inst, weight: pair.weight };
        }
      }
      return { path: inst, weight: defaultPriority };
    })
    // sort based on priorities
    .sort((a, b) => (b.weight - a.weight))
    // remove priority flag
    .map(pair => pair.path);
}

function canAccess(file) {
  if (!file) {
    return false;
  }

  try {
    fs.accessSync(file);
    return true;
  } catch (e) {
    return false;
  }
}

function isExecutable(file) {
  if (!file) {
    return false;
  }

  try {
    var stat = fs.statSync(file);
    return stat && typeof stat.isFile === "function" && stat.isFile();
  } catch (e) {
    return false;
  }
}

module.exports = {
  sort,
  canAccess,
  isExecutable,
  newLineRegex,
}