'use strict';

var _templateObject = _taggedTemplateLiteral(['\n        DISPLAY environment variable is set to ', ' on Linux\n        Assuming this DISPLAY points at working X11 server,\n        Cypress will not spawn own Xvfb\n\n        NOTE: if the X11 server is NOT working, Cypress will exit without explanation,\n          see ', '\n        Solution: Unset the DISPLAY variable and try again:\n          DISPLAY= npx cypress run ...\n      '], ['\n        DISPLAY environment variable is set to ', ' on Linux\n        Assuming this DISPLAY points at working X11 server,\n        Cypress will not spawn own Xvfb\n\n        NOTE: if the X11 server is NOT working, Cypress will exit without explanation,\n          see ', '\n        Solution: Unset the DISPLAY variable and try again:\n          DISPLAY= npx cypress run ...\n      ']);

function _taggedTemplateLiteral(strings, raw) { return Object.freeze(Object.defineProperties(strings, { raw: { value: Object.freeze(raw) } })); }

var os = require('os');
var Promise = require('bluebird');
var Xvfb = require('@cypress/xvfb');

var _require = require('common-tags'),
    stripIndent = _require.stripIndent;

var debug = require('debug')('cypress:cli');
var debugXvfb = require('debug')('cypress:xvfb');

var _require2 = require('../errors'),
    throwFormErrorText = _require2.throwFormErrorText,
    errors = _require2.errors;

var util = require('../util');

var xvfb = Promise.promisifyAll(new Xvfb({
  timeout: 30000, // milliseconds
  onStderrData: function onStderrData(data) {
    if (debugXvfb.enabled) {
      debugXvfb(data.toString());
    }
  }
}));

module.exports = {
  _debugXvfb: debugXvfb, // expose for testing

  _xvfb: xvfb, // expose for testing

  start: function start() {
    debug('Starting Xvfb');

    return xvfb.startAsync().return(null).catch({ nonZeroExitCode: true }, throwFormErrorText(errors.nonZeroExitCodeXvfb)).catch(function (err) {
      if (err.known) {
        throw err;
      }

      return throwFormErrorText(errors.missingXvfb)(err);
    });
  },
  stop: function stop() {
    debug('Stopping Xvfb');

    return xvfb.stopAsync().return(null).catch(function () {
      // noop
    });
  },
  isNeeded: function isNeeded() {
    if (os.platform() !== 'linux') {
      return false;
    }

    if (process.env.DISPLAY) {
      var issueUrl = util.getGitHubIssueUrl(4034);

      var message = stripIndent(_templateObject, process.env.DISPLAY, issueUrl);

      debug(message);

      return false;
    }

    debug('undefined DISPLAY environment variable');
    debug('Cypress will spawn its own Xvfb');

    return true;
  },


  // async method, resolved with Boolean
  verify: function verify() {
    return xvfb.startAsync().return(true).catch(function (err) {
      debug('Could not verify xvfb: %s', err.message);

      return false;
    }).finally(xvfb.stopAsync);
  }
};