var Grnhse = Grnhse || {};

Grnhse.Settings = {
  targetDomain:   'https://job-boards.greenhouse.io',
  scrollOnLoad:   true,
  autoLoad:       true,
  boardURI:       'https://job-boards.greenhouse.io/embed/job_board?for=alphalion',
  applicationURI: 'https://job-boards.greenhouse.io/embed/job_app?for=alphalion',
  baseURI:        '',
  iFrameWidth:    '100%',
  useEmbeddedInternalBoard: false
};

Grnhse.Const = {
  JOB_ID:       'gh_jid',
  SOURCE_TOKEN: 'gh_src',
  PROGRAMMATIC_SOURCING_TRACKING: 'ccuid'
};

Grnhse.Config = {
  IframeDefault: {
    id:          'grnhse_iframe',
    width:       Grnhse.Settings.iFrameWidth,
    frameborder: '0',
    scrolling:   'no',
    allow:       'geolocation',
    onload:      undefined,
    title:       'Greenhouse Job Board'
  }
};

Grnhse.UriHelper = {
  base: function() {
    var uriHelper = Grnhse.UriHelper,
        location = uriHelper.currentLocation(),
        settings = Grnhse.Settings;

    return window && location ? uriHelper.pathFromLocation(location) : settings.boardURI;
  },

  currentLocation: function() {
    return window.top.location;
  },
  getParam: function(name) {
    var location = Grnhse.UriHelper.currentLocation(),
        uri = location.href,
        start = uri.indexOf(name),
        end;

    if (start === -1) {
      return null;
    }

    start += name.length + 1;
    end   = uri.substr(start).search(/(&|#|$|;)/);

    return uri.substr(start, end);
  },
  appendParams: function(url, params) {
    params.push('b=' + Grnhse.UriHelper.base());
    url += (url.indexOf('?') === -1) ? '?' : '&';
    return url + params.join('&');
  },
  pathFromLocation: function(location) {
    return encodeURIComponent(location.protocol + '//' + location.host + location.pathname);
  }
};

  var Grnhse = Grnhse || {};

Grnhse.Iframe = function(jobId, source, ccuid) {
  this.jobId = jobId || Grnhse.UriHelper.getParam(Grnhse.Const.JOB_ID) || "";
  this.source = source || Grnhse.UriHelper.getParam(Grnhse.Const.SOURCE_TOKEN) || "";
  this.ccuid =
    ccuid ||
    Grnhse.UriHelper.getParam(Grnhse.Const.PROGRAMMATIC_SOURCING_TRACKING) ||
    "";
  this.queryParams = {
    token: this.jobId,
    t: this.source,
    ccuid: this.ccuid,
  };
  this.iframeElement = null;

  this.registerEventHandlers();

  // iframe src
  this.pathToLoad = !!this.jobId ? this.applicationUrl() : this.boardUrl();
  this.iframeElement = this.render();
};

Grnhse.Iframe.prototype.boardUrl = function() {
  const boardUri = Grnhse.Settings.boardURI;
  const url = new URL(boardUri);

  if (this.source) {
    url.searchParams.set("t", this.source);
  }

  if (Grnhse.Settings.useEmbeddedInternalBoard) {
    url.searchParams.set("internal", "true");
  }

  return url.href;
};

Grnhse.Iframe.prototype.applicationUrl = function() {
  const applicationUri = Grnhse.Settings.applicationURI;
  const url = new URL(applicationUri);

  for (const [key, value] of Object.entries(this.queryParams)) {
    if (value) {
      url.searchParams.set(key, value);
    }
  }

  if (Grnhse.Settings.useEmbeddedInternalBoard) {
    url.searchParams.set("internal", "true");
  }

  return url.href;
};

Grnhse.Iframe.prototype.build = function() {
  const iframe = document.createElement("iframe");
  const attributes = Grnhse.Config.IframeDefault;

  for (const [attribute, value] of Object.entries(attributes)) {
    if (attributes.hasOwnProperty(attribute)) {
      iframe.setAttribute(attribute, value);
    }
  }

  iframe.setAttribute("src", this.pathToLoad);

  return iframe;
};

Grnhse.Iframe.prototype.render = function() {
  const container = document.getElementById("grnhse_app");
  const iframeElement = this.build();

  container.innerHTML = "";
  container.appendChild(iframeElement);

  return iframeElement;
};

Grnhse.Iframe.prototype.registerEventHandlers = function() {
  let resizeEvent = null;
  let instance = this;

  window.addEventListener('message', resize, false);
  window.addEventListener('resize', windowResize, false);

  function windowResize(e) {
    // Pass resize event from parent window to iframe
    clearTimeout(resizeEvent);
    resizeEvent = setTimeout(triggerResize, 200);
  }

  function triggerResize() {
    if (window.postMessage && instance.iframeElement) {
      instance.iframeElement.contentWindow.postMessage('resize', '*');
    }
  }

  function resize(e) {
    if (instance.iframeElement && e.origin === Grnhse.Settings.targetDomain && e.data > 0) {
      instance.iframeElement.setAttribute('height', e.data);
    }
  }
};

Grnhse.Iframe.load = function(jobId, source, ccuid) {
  return new Grnhse.Iframe(jobId, source, ccuid);
};

Grnhse.Iframe.autoLoad = function() {
  Grnhse.Iframe.load();
};

(function() {
  if (Grnhse.Settings.autoLoad) {
    addEventListener("load", Grnhse.Iframe.autoLoad);
  }
})();