/**
 * This script will ensure that users are using a supported version of node
 * for the project.
 *
 * NOTE: Ensure this script uses ES5 only as the user may be running an old
 * version of Node, which this script wants to test against.
 */

/* eslint-disable */

var exec = require('child_process').exec
var existsSync = require('fs').existsSync
var pathResolve = require('path').resolve

if (existsSync(pathResolve(__dirname, '../../node_modules'))) {
  // An install has already occurred.
  console.log('Already Installed')
}

// Inspired by "create-react-app". Thanks @gaearon :)
function checkNodeVersion() {
  var semver = require('semver')

  if (!semver.satisfies(process.version, packageJson.engines.node)) {
    console.error(
      'You are currently running Node %s but %s requires %s. Please use a supported version of Node.\n',
      process.version,
      packageJson.name,
      packageJson.engines.node
    )
    process.exit(1)
  }
}

var packageJson = require('../../../package.json')

if (
  !packageJson.engines ||
  !packageJson.engines.node ||
  !packageJson.devDependencies ||
  !packageJson.devDependencies.semver
) {
  // The package has already been customised. Ignore this script.

  console.log('Package already customized')
}

exec(
  'npm install semver@' + packageJson.devDependencies.semver,
  function installSemverCb(err, stdout, stderr) {
    if (err) throw err
    checkNodeVersion()
  }
)