// Store the host value for the current page
const currentPageHost = window.location.href.match(/^(?:[^\/]*\/){2}[^\/]+/g)[0];

// Define v3-wayfinding elements
var wayfindingModal = document.getElementById('v3-wayfinding-modal');
var wayfindingClose = document.getElementById('v3-wayfinding-close');
var wayfindingStay = document.getElementById('v3-wayfinding-stay');
var wayfindingSwitch = document.getElementById('v3-wayfinding-switch');
var wayfindingOptOut = document.getElementById('v3-wayfinding-opt-out');
var wayfindingOptOutInput = document.getElementById(
  'v3-wayfinding-opt-out-input'
);
var wayfindingFindOutToggle = document.getElementById('find-out-toggle');
var wayfindingFindOutInstructions = document.getElementById(
  'find-out-instructions'
);

/**
 * Builds a referrer whitelist array that includes the current page host and all
 * values from the cloudUrls array defined in layouts/partials/footer/javascript.html
 */
var referrerWhitelist = cloudUrls.concat(currentPageHost);

// v3-wayfinding preference cookie name
var wayfindingPrefCookie = 'v3_wayfinding_show';

// Toggle the v3-wayfinding modal
function toggleWayfinding () {
  wayfindingModal.classList.toggle('open');
}

// Toggle wayfinding modal preference cookie
function toggleWayfindingPreference () {
  if (getPreference(wayfindingPrefCookie) === true) {
    setPreference(wayfindingPrefCookie, false);
  } else {
    setPreference(wayfindingPrefCookie, true);
  }
}

// Define the slideDown and slideUp animations
function slideDown (elem) {
  elem.style.height = `${elem.scrollHeight}px`;
  elem.style.opacity = 1;
}

function slideUp (elem) {
  elem.style.height = 0;
  elem.style.opacity = 0;
}

/**
 * Check to see if the v3-wayfinding modal should be opened:
 *  - Is the user coming from a non-whitelisted external referrer?
 *  - Has the user opted out of the wayfinding modal?
 */
function shouldOpenWayfinding () {
  // Extract the protocol and hostname of referrer
  const referrerMatch = document.referrer.match(/^(?:[^\/]*\/){2}[^\/]+/g);
  const referrerHost = referrerMatch ? referrerMatch[0] : '';
  var isExternalReferrer = !referrerWhitelist.includes(referrerHost);
  var wayfindingOptedOut = getPreference(wayfindingPrefCookie);

  // Only return true if all conditions are true
  return isExternalReferrer && wayfindingOptedOut;
}

/**
 * Function that checks the wayfindingPrefCookie and sets the state of the
 * wayfinding checkbox input.
 */
function setWayfindingInputState () {
  var currentPreference = getPreference(wayfindingPrefCookie);

  if (currentPreference === false) {
    wayfindingOptOutInput.checked = true;
  }
}

function submitWayfindingData (engine, action) {
  const pageData = {
    host: location.hostname,
    path: location.pathname,
    referrer: document.referrer === '' ? 'direct' : document.referrer,
  };

  // Build lp using page data and engine data
  const lp = `ioxwayfinding,host=${pageData.host},path=${pageData.path},referrer=${pageData.referrer},engine=${engine} action="${action}"`;

  // Send the wayfinding data
  xhr = new XMLHttpRequest();
  xhr.open(
    'POST',
    'https://j32dswat7l.execute-api.us-east-1.amazonaws.com/prod/wayfinding'
  );
  xhr.setRequestHeader('X-Requested-With', 'XMLHttpRequest');
  xhr.setRequestHeader(
    'Access-Control-Allow-Origin',
    `${location.protocol}//${location.host}`
  );
  xhr.setRequestHeader('Content-Type', 'text/plain; charset=utf-8');
  xhr.setRequestHeader('Accept', 'application/json');
  xhr.send(lp);

  return false;
}

// When the user clicks on the stay button, close modal, submit data, and stay on the page.
wayfindingStay.onclick = function (event) {
  var engine = wayfindingStay.dataset.engine;
  var action = 'stay';

  event.preventDefault();
  submitWayfindingData(engine, action);
  toggleWayfinding();
};

// When the user clicks on the switch button, submit data and follow link.
wayfindingSwitch.onclick = function (event) {
  var engine = wayfindingSwitch.dataset.engine;
  var action = 'switch';

  submitWayfindingData(engine, action);
};

// When the user clicks on the "X" wayfinding close element, close the modal
wayfindingClose.onclick = function (event) {
  toggleWayfinding();
};

wayfindingOptOut.onclick = function (event) {
  toggleWayfindingPreference();
};

// Toggle instructions for finding out which storage engine you're using
wayfindingFindOutToggle.onclick = function (event) {
  event.preventDefault();
  if (wayfindingFindOutInstructions.classList.contains('open')) {
    slideUp(wayfindingFindOutInstructions);
    wayfindingFindOutInstructions.classList.remove('open');
  } else {
    slideDown(wayfindingFindOutInstructions);
    wayfindingFindOutInstructions.classList.add('open');
  }
};

/**
 * Check to see if the referrer is in the referrer whitelist, otherwise trigger
 * the v3-wayfinding modal.
 * This reuses the referrerHost variable defined in assets/js/influxdb-url.js
 */
if (shouldOpenWayfinding()) {
  toggleWayfinding();
}

// Set the state of the show wayfinding input checkbox
setWayfindingInputState();