var OPTIONS = {
  startTime: "2018-02-20T13:29:45",
  ticketIndex: 0,
  ticketQuantity: 1
};

function checkLocation() {
  if (location.href.indexOf("eventbrite") == -1)
    throw new Error("Not being run on the Eventbrite event page");
}

function post(path, params) {
  var form = document.createElement("form");
  form.setAttribute("method", "post");
  form.setAttribute("action", path);

  for (var key in params)
    if (params.hasOwnProperty(key)) {
      var hiddenField = document.createElement("input");
      hiddenField.setAttribute("type", "hidden");
      hiddenField.setAttribute("name", key);
      hiddenField.setAttribute("value", params[key]);
      form.appendChild(hiddenField);
    }

  document.body.appendChild(form);
  form.submit();
}

function findAll(needle, haystack) {
  const rx = new RegExp(needle, "g");
  const matches = [];

  while ((match = rx.exec(haystack)) !== null) {
    matches.push(match);
  }

  return matches;
}

function getTicket(data) {
  const ticketMatches = findAll("ticket_form_element_name\":\"([^\"]+)\"", data);
  return ticketMatches[OPTIONS.ticketIndex][1];
}

function isTicketAvailable(source) {
  const mediator = require('mediatorjs');
  const ticketData = mediator && mediator.get('ticketOrderOptions');
  if (ticketData && ticketData.collection) {
    const ticket = ticketData.collection[OPTIONS.ticketIndex];
    if (ticket && (ticket.status_is_sold_out || ticket.status_is_ended)) {
      throw new Error("SOLD OUT: " + ticket.status_is_sold_out + " or ENDED: " + ticket.status_is_ended);
    }
  }

  const notOnSale = findAll("\"not_on_sale\":(true|false)+", source);
  if (notOnSale[OPTIONS.ticketIndex] && notOnSale[OPTIONS.ticketIndex][1] == "true")
    return false;

  return true;
}

var scheduler = initScheduler();
var running = true;

function run() {
  checkLocation();
  $.get(location.href, (data) => {
    const ticket = getTicket(data);

    if (!ticket || !isTicketAvailable(data)) {
      console.log("Unsuccessful: " + (new Date()).toLocaleTimeString());
      if (running) setTimeout(run, 500);
      return;
    }

    const payload = {
      'eid': $("form input[name=eid]").attr('value'),
      'has_javascript': 1,
      [ticket]: OPTIONS.ticketQuantity
    };

    console.log(payload);
    post("https://www.eventbrite.co.uk/orderstart", payload);
  });
}

function stop() {
  if (!running) return "Already stopped";
  running = false;
  return "Stopped";
}

function initScheduler() {
  if (typeof scheduler !== 'undefined') clearTimeout(scheduler);
  return null;
}

$(document).ready(function() {
  checkLocation();

  const diff = Date.parse(OPTIONS.startTime) - Date.now();
  const timeToStart = Math.max(0, diff || 0);

  console.log(`Scheduled start in:` +
    `${Math.floor(timeToStart / (1000 * 60))}m ` +
    `${Math.floor(timeToStart / 1000)%60}s`);

  scheduler = setTimeout(run, timeToStart);
});