import type {JsonObject, Wnd} from './types';
import {doNotTrack, buildWarn, isBot} from './utils';
import {version} from '../package.json';

export {Wnd};
const run = () => {
  if (!window) return;
  const isDnt = doNotTrack();

  const {
    // @ts-ignore
    screen: {width, height},
    // @ts-ignore
    navigator: {language, userAgent},
    location: {hostname, pathname, search, origin},
    document,
    history,
  } = window;

  const script = document.querySelector('script[data-site]');
  if (!script) return console.error('script.js not found');

  // @ts-ignore
  const url = new URL(document.currentScript.src).origin;

  const attr = (key: string) =>
    script && (script.getAttribute(key) || script.getAttribute(`data-${key}`));

  const shortcode = attr('site'); // shortcode
  const dnt0ff = attr('dnt-off'); // shoud we send dnt=0?
  const spa = attr('spa'); // is it spa
  const warn = buildWarn();
  const parsedHosthName = attr('hostname') || hostname;
  // @ts-ignore
  const canonical = attr('canonical'); // should we monitor canonical urls

  if (!shortcode) return warn('site not found');
  if (isBot(userAgent)) return warn('bot detected');
  if (dnt0ff && isDnt) return warn('dnt-off and dnt=1');

  if (
    'visibilityState' in document &&
    // @ts-ignore
    'prerender' === document.visibilityState
  ) {
    return warn('Prerendering');
  }

  const historyAttached = () => {
    const pushState = history.pushState;
    if (void 0 !== history) {
      history.pushState = function () {
        var output = pushState.apply(history, arguments as any);
        return (
          window.dispatchEvent(new Event('pushstate')),
          window.dispatchEvent(new Event('prxm')),
          output
        );
      };
      window.addEventListener('popstate', function () {
        window.dispatchEvent(new Event('prxm'));
      });
      window.addEventListener('prxm', monitor);
    }
  };

  const hashAttached = () => {
    window.addEventListener('hashchange', monitor);
  };

  const init = () => {
    warn('init');

    if (spa) {
      switch (spa) {
        case 'history':
          historyAttached();
          break;
        case 'hash':
          hashAttached();
          break;
        default:
          void 0 !== history ? historyAttached() : hashAttached();
      }
    } else {
      window.addEventListener('load', monitor);
    }
  };

  const pxl = (p: string, e: JsonObject) => {
    const element = document.createElement('img') as HTMLImageElement;
    element.setAttribute('aria-hidden', 'true');
    element.setAttribute('alt', '');
    element.src = url + e.toString();
    element.style.position = 'absolute';
    // @ts-ignore
    element.src = url + p + '/pixel?' + new URLSearchParams(e).toString();
    element.addEventListener('load', function () {
      element.parentNode && element.parentNode.removeChild(element);
    });
    element.addEventListener('error', function () {
      element.parentNode && element.parentNode.removeChild(element);
    });
    document.body.appendChild(element);
  };
  // @ts-ignore
  const event = (e: JsonObject) => {};

  const send = (p: string, data: JsonObject) => {
    const xhr = new XMLHttpRequest();
    xhr.open('POST', url + p, true);
    xhr.setRequestHeader('Content-Type', 'text/plain');
    xhr.addEventListener('error', function () {
      pxl(p, data);
    });
    xhr.send(JSON.stringify(data));
  };

  const monitor = () => {
    const data = {
      p: origin + pathname + search,
      v: version,
      s: shortcode,
      h: parsedHosthName,
      r: document.referrer,
      cid: Date.now().toString(32),
      // @ts-ignore
      l: navigator.userLanguage || navigator.language || '',
      // performance metrics
    };
    send('/hit/torch', data);
  };

  // @ts-ignore
  const monitorEvent = () => {};

  if (!(window as Wnd).proxima) {
    const proxima = {
      monitor: monitor,
      event: monitor,
    };
    (window as Wnd).proxima = proxima;
    init();
  }
};
run();