//copied from https://github.com/faisalman/ua-parser-js/blob/master/src/ua-parser.js

const EMPTY = '',
  UNKNOWN = '?',
  FUNC_TYPE = 'function',
  UNDEF_TYPE = 'undefined',
  OBJ_TYPE = 'object',
  STR_TYPE = 'string',
  NAME = 'name',
  VERSION = 'version';

const BROWSER = 'Browser',
  CHROME = 'Chrome',
  FIREFOX = 'Firefox',
  OPERA = 'Opera';

const oldSafariMap = {
  '1.0': '/8',
  '1.2': '/1',
  '1.3': '/3',
  '2.0': '/412',
  '2.0.2': '/416',
  '2.0.3': '/417',
  '2.0.4': '/419',
  '?': '/',
};

function strMapper(str, map) {
  for (const i in map) {
    // check if current value is array
    if (typeof map[i] === OBJ_TYPE && map[i].length > 0) {
      for (const j in map[i]) {
        if (j.includes(str)) {
          return i === UNKNOWN ? undefined : i;
        }
      }
    } else if (map[i].includes(str)) {
      return i === UNKNOWN ? undefined : i;
    }
  }
  return str;
}
function majorize(version) {
  return typeof version === STR_TYPE
    ? version.replace(/[^\d.]/g, EMPTY).split('.')[0]
    : undefined;
}

function rgxMapper(browser, ua, arrays) {
  let i = 0,
    j,
    k,
    p,
    q,
    matches,
    match;

  // loop through all regexes maps
  while (i < arrays.length && !matches) {
    const regex = arrays[i], // even sequence (0,2,4,..)
      props = arrays[i + 1]; // odd sequence (1,3,5,..)
    j = k = 0;

    // try matching uastring with regexes
    while (j < regex.length && !matches) {
      matches = regex[j++].exec(ua);

      if (matches) {
        for (p = 0; p < props.length; p++) {
          match = matches[++k];
          q = props[p];
          // check if given property is actually array
          if (typeof q === OBJ_TYPE && q.length > 0) {
            if (q.length == 2) {
              if (typeof q[1] == FUNC_TYPE) {
                // assign modified match
                browser[q[0]] = q[1].call(browser, match);
              } else {
                // assign given value, ignore regex match
                browser[q[0]] = q[1];
              }
            } else if (q.length == 3) {
              // check whether function or regex
              if (typeof q[1] === FUNC_TYPE && !(q[1].exec && q[1].test)) {
                // call function (usually string mapper)
                browser[q[0]] = match
                  ? q[1].call(browser, match, q[2])
                  : undefined;
              } else {
                // sanitize match using given regex
                browser[q[0]] = match ? match.replace(q[1], q[2]) : undefined;
              }
            } else if (q.length == 4) {
              browser[q[0]] = match
                ? q[3].call(browser, match.replace(q[1], q[2]))
                : undefined;
            }
          } else {
            browser[q] = match ? match : undefined;
          }
        }
      }
    }
    i += 2;
  }
}

const browserRegexes = [
  [
    /\b(?:crmo|crios)\/([\w.]+)/i, // Chrome for Android/iOS
  ],
  [VERSION, [NAME, 'Chrome']],
  [
    /edg(?:e|ios|a)?\/([\w.]+)/i, // Microsoft Edge
  ],
  [VERSION, [NAME, 'Edge']],
  [
    // Presto based
    /(opera mini)\/([-\w.]+)/i, // Opera Mini
    /(opera [mobiletab]{3,6})\b.+version\/([-\w.]+)/i, // Opera Mobi/Tablet
    /(opera)(?:.+version\/|[/ ]+)([\w.]+)/i, // Opera
  ],
  [NAME, VERSION],
  [
    /opios[/ ]+([\w.]+)/i, // Opera mini on iphone >= 8.0
  ],
  [VERSION, [NAME, OPERA + ' Mini']],
  [
    /\bopr\/([\w.]+)/i, // Opera Webkit
  ],
  [VERSION, [NAME, OPERA]],
  [
    // Mixed
    /(kindle)\/([\w.]+)/i, // Kindle
    /(lunascape|maxthon|netfront|jasmine|blazer)[/ ]?([\w.]*)/i, // Lunascape/Maxthon/Netfront/Jasmine/Blazer
    // Trident based
    /(avant |iemobile|slim)(?:browser)?[/ ]?([\w.]*)/i, // Avant/IEMobile/SlimBrowser
    /(ba?idubrowser)[/ ]?([\w.]+)/i, // Baidu Browser
    /(?:ms|\()(ie) ([\w.]+)/i, // Internet Explorer

    // Webkit/KHTML based                                               // Flock/RockMelt/Midori/Epiphany/Silk/Skyfire/Bolt/Iron/Iridium/PhantomJS/Bowser/QupZilla/Falkon
    /(flock|rockmelt|midori|epiphany|silk|skyfire|ovibrowser|bolt|iron|vivaldi|iridium|phantomjs|bowser|quark|qupzilla|falkon|rekonq|puffin|brave|whale|qqbrowserlite|qq)\/([-\w.]+)/i,
    // Rekonq/Puffin/Brave/Whale/QQBrowserLite/QQ, aka ShouQ
    /(weibo)__([\d.]+)/i, // Weibo
  ],
  [NAME, VERSION],
  [
    /(?:\buc? ?browser|(?:juc.+)ucweb)[/ ]?([\w.]+)/i, // UCBrowser
  ],
  [VERSION, [NAME, 'UC' + BROWSER]],
  [
    /\bqbcore\/([\w.]+)/i, // WeChat Desktop for Windows Built-in Browser
  ],
  [VERSION, [NAME, 'WeChat(Win) Desktop']],
  [
    /micromessenger\/([\w.]+)/i, // WeChat
  ],
  [VERSION, [NAME, 'WeChat']],
  [
    /konqueror\/([\w.]+)/i, // Konqueror
  ],
  [VERSION, [NAME, 'Konqueror']],
  [
    /trident.+rv[: ]([\w.]{1,9})\b.+like gecko/i, // IE11
  ],
  [VERSION, [NAME, 'IE']],
  [
    /yabrowser\/([\w.]+)/i, // Yandex
  ],
  [VERSION, [NAME, 'Yandex']],
  [
    /(avast|avg)\/([\w.]+)/i, // Avast/AVG Secure Browser
  ],
  [[NAME, /(.+)/, '$1 Secure ' + BROWSER], VERSION],
  [
    /\bfocus\/([\w.]+)/i, // Firefox Focus
  ],
  [VERSION, [NAME, FIREFOX + ' Focus']],
  [
    /\bopt\/([\w.]+)/i, // Opera Touch
  ],
  [VERSION, [NAME, OPERA + ' Touch']],
  [
    /coc_coc\w+\/([\w.]+)/i, // Coc Coc Browser
  ],
  [VERSION, [NAME, 'Coc Coc']],
  [
    /dolfin\/([\w.]+)/i, // Dolphin
  ],
  [VERSION, [NAME, 'Dolphin']],
  [
    /coast\/([\w.]+)/i, // Opera Coast
  ],
  [VERSION, [NAME, OPERA + ' Coast']],
  [
    /miuibrowser\/([\w.]+)/i, // MIUI Browser
  ],
  [VERSION, [NAME, 'MIUI ' + BROWSER]],
  [
    /fxios\/([-\w.]+)/i, // Firefox for iOS
  ],
  [VERSION, [NAME, FIREFOX]],
  [
    /\bqihu|(qi?ho?o?|360)browser/i, // 360
  ],
  [[NAME, '360 ' + BROWSER]],
  [/(oculus|samsung|sailfish)browser\/([\w.]+)/i],
  [[NAME, /(.+)/, '$1 ' + BROWSER], VERSION],
  [
    // Oculus/Samsung/Sailfish Browser
    /(comodo_dragon)\/([\w.]+)/i, // Comodo Dragon
  ],
  [[NAME, /_/g, ' '], VERSION],
  [
    /(electron)\/([\w.]+) safari/i, // Electron-based App
    /(tesla)(?: qtcarbrowser|\/(20\d\d\.[-\w.]+))/i, // Tesla
    /m?(qqbrowser|baiduboxapp|2345Explorer)[/ ]?([\w.]+)/i, // QQBrowser/Baidu App/2345 Browser
  ],
  [NAME, VERSION],
  [
    /(metasr)[/ ]?([\w.]+)/i, // SouGouBrowser
    /(lbbrowser)/i, // LieBao Browser
  ],
  [NAME],
  [
    // WebView
    /((?:fban\/fbios|fb_iab\/fb4a)(?!.+fbav)|;fbav\/([\w.]+);)/i, // Facebook App for iOS & Android
  ],
  [[NAME, 'Facebook'], VERSION],
  [
    /safari (line)\/([\w.]+)/i, // Line App for iOS
    /\b(line)\/([\w.]+)\/iab/i, // Line App for Android
    /(chromium|instagram)[/ ]([-\w.]+)/i, // Chromium/Instagram
  ],
  [NAME, VERSION],
  [
    /\bgsa\/([\w.]+) .*safari\//i, // Google Search Appliance on iOS
  ],
  [VERSION, [NAME, 'GSA']],
  [
    /headlesschrome(?:\/([\w.]+)| )/i, // Chrome Headless
  ],
  [VERSION, [NAME, CHROME + ' Headless']],
  [
    / wv\).+(chrome)\/([\w.]+)/i, // Chrome WebView
  ],
  [[NAME, CHROME + ' WebView'], VERSION],
  [
    /droid.+ version\/([\w.]+)\b.+(?:mobile safari|safari)/i, // Android Browser
  ],
  [VERSION, [NAME, 'Android ' + BROWSER]],
  [
    /(chrome|omniweb|arora|[tizenoka]{5} ?browser)\/v?([\w.]+)/i, // Chrome/OmniWeb/Arora/Tizen/Nokia
  ],
  [NAME, VERSION],
  [
    /version\/([\w.]+) .*mobile\/\w+ (safari)/i, // Mobile Safari
  ],
  [VERSION, [NAME, 'Mobile Safari']],
  [
    /version\/([\w.]+) .*(mobile ?safari|safari)/i, // Safari & Safari Mobile
  ],
  [VERSION, NAME],
  [
    /webkit.+?(mobile ?safari|safari)(\/[\w.]+)/i, // Safari < 3.0
  ],
  [NAME, [VERSION, strMapper, oldSafariMap]],
  [/(webkit|khtml)\/([\w.]+)/i],
  [NAME, VERSION],
  [
    // Gecko based
    /(navigator|netscape\d?)\/([-\w.]+)/i, // Netscape
  ],
  [[NAME, 'Netscape'], VERSION],
  [
    /mobile vr; rv:([\w.]+)\).+firefox/i, // Firefox Reality
  ],
  [VERSION, [NAME, FIREFOX + ' Reality']],
  [
    /ekiohf.+(flow)\/([\w.]+)/i, // Flow
    /(swiftfox)/i, // Swiftfox
    /(icedragon|iceweasel|camino|chimera|fennec|maemo browser|minimo|conkeror|klar)[/ ]?([\w.+]+)/i,
    // IceDragon/Iceweasel/Camino/Chimera/Fennec/Maemo/Minimo/Conkeror/Klar
    /(seamonkey|k-meleon|icecat|iceape|firebird|phoenix|palemoon|basilisk|waterfox)\/([-\w.]+)$/i,
    // Firefox/SeaMonkey/K-Meleon/IceCat/IceApe/Firebird/Phoenix
    /(firefox)\/([\w.]+)/i, // Other Firefox-based
    /(mozilla)\/([\w.]+) .+rv:.+gecko\/\d+/i, // Mozilla

    // Other
    /(polaris|lynx|dillo|icab|doris|amaya|w3m|netsurf|sleipnir|obigo|mosaic|(?:go|ice|up)[. ]?browser)[-/ ]?v?([\w.]+)/i,
    // Polaris/Lynx/Dillo/iCab/Doris/Amaya/w3m/NetSurf/Sleipnir/Obigo/Mosaic/Go/ICE/UP.Browser
    /(links) \(([\w.]+)/i, // Links
  ],
  [NAME, VERSION],
];

const _ua =
  typeof window !== UNDEF_TYPE && window.navigator && window.navigator.userAgent
    ? window.navigator.userAgent
    : EMPTY;

interface Browser {
  name?: string;
  version?: string;
}

export function evaluateBrowserVersion(): Browser {
  const browser: Browser = { name: '', version: '' };
  rgxMapper(browser, _ua, browserRegexes);
  browser.version = majorize(browser.version);
  return browser;
}

type Mobile = RegExpMatchArray | null;

export const isMobile = {
  Android: function (): Mobile {
    return navigator.userAgent.match(/Android/i);
  },
  BlackBerry: function (): Mobile {
    return navigator.userAgent.match(/BlackBerry/i);
  },
  iOS: function (): Mobile {
    return navigator.userAgent.match(/iPhone|iPad|iPod/i);
  },
  Opera: function (): Mobile {
    return navigator.userAgent.match(/Opera Mini/i);
  },
  Windows: function (): Mobile {
    return (
      navigator.userAgent.match(/IEMobile/i) ||
      navigator.userAgent.match(/WPDesktop/i)
    );
  },
  any: function (): Mobile {
    return (
      isMobile.Android() ||
      isMobile.BlackBerry() ||
      isMobile.iOS() ||
      isMobile.Opera() ||
      isMobile.Windows()
    );
  },
};

export default evaluateBrowserVersion;