import { ServiceWorkerActivate } from './types';

export const excludeOs = operatingSystem => {
  if (operatingSystem.os === 'iOS' && operatingSystem.osVersion.startsWith('12')) {
    return true;
  }
  if (operatingSystem.os === 'Mac OS X' && operatingSystem.osVersion.startsWith('10_15_6')) {
    return true;
  }
  return false;
};
export const getOperatingSystem = navigator => {
  const nVer = navigator.appVersion;
  const nAgt = navigator.userAgent;
  const unknown = '-';
  // system
  let os = unknown;
  const clientStrings = [
    { s: 'Windows 10', r: /(Windows 10.0|Windows NT 10.0)/ },
    { s: 'Windows 8.1', r: /(Windows 8.1|Windows NT 6.3)/ },
    { s: 'Windows 8', r: /(Windows 8|Windows NT 6.2)/ },
    { s: 'Windows 7', r: /(Windows 7|Windows NT 6.1)/ },
    { s: 'Windows Vista', r: /Windows NT 6.0/ },
    { s: 'Windows Server 2003', r: /Windows NT 5.2/ },
    { s: 'Windows XP', r: /(Windows NT 5.1|Windows XP)/ },
    { s: 'Windows 2000', r: /(Windows NT 5.0|Windows 2000)/ },
    { s: 'Windows ME', r: /(Win 9x 4.90|Windows ME)/ },
    { s: 'Windows 98', r: /(Windows 98|Win98)/ },
    { s: 'Windows 95', r: /(Windows 95|Win95|Windows_95)/ },
    { s: 'Windows NT 4.0', r: /(Windows NT 4.0|WinNT4.0|WinNT|Windows NT)/ },
    { s: 'Windows CE', r: /Windows CE/ },
    { s: 'Windows 3.11', r: /Win16/ },
    { s: 'Android', r: /Android/ },
    { s: 'Open BSD', r: /OpenBSD/ },
    { s: 'Sun OS', r: /SunOS/ },
    { s: 'Chrome OS', r: /CrOS/ },
    { s: 'Linux', r: /(Linux|X11(?!.*CrOS))/ },
    { s: 'iOS', r: /(iPhone|iPad|iPod)/ },
    { s: 'Mac OS X', r: /Mac OS X/ },
    { s: 'Mac OS', r: /(Mac OS|MacPPC|MacIntel|Mac_PowerPC|Macintosh)/ },
    { s: 'QNX', r: /QNX/ },
    { s: 'UNIX', r: /UNIX/ },
    { s: 'BeOS', r: /BeOS/ },
    { s: 'OS/2', r: /OS\/2/ },
    {
      s: 'Search Bot',
      r: /(nuhk|Googlebot|Yammybot|Openbot|Slurp|MSNBot|Ask Jeeves\/Teoma|ia_archiver)/,
    },
  ];
  for (const id in clientStrings) {
    const cs = clientStrings[id];
    if (cs.r.test(nAgt)) {
      os = cs.s;
      break;
    }
  }

  let osVersion = unknown;

  if (/Windows/.test(os)) {
    osVersion = /Windows (.*)/.exec(os)[1];
    os = 'Windows';
  }

  switch (os) {
    case 'Mac OS':
    case 'Mac OS X':
    case 'Android':
      osVersion =
        /(?:Android|Mac OS|Mac OS X|MacPPC|MacIntel|Mac_PowerPC|Macintosh) ([._\d]+)/.exec(nAgt)[1];
      break;

    case 'iOS': {
      const osVersionArray = /OS (\d+)_(\d+)_?(\d+)?/.exec(nVer);
      if (osVersionArray != null && osVersionArray.length > 2) {
        osVersion =
          osVersionArray[1] + '.' + osVersionArray[2] + '.' + (parseInt(osVersionArray[3]) | 0);
      }
      break;
    }
  }
  return {
    os,
    osVersion,
  };
};

function getBrowser() {
  const ua = navigator.userAgent;
  let tem;
  let M = ua.match(/(opera|chrome|safari|firefox|msie|trident(?=\/))\/?\s*(\d+)/i) || [];
  if (/trident/i.test(M[1])) {
    tem = /\brv[ :]+(\d+)/g.exec(ua) || [];
    return { name: 'ie', version: tem[1] || '' };
  }
  if (M[1] === 'Chrome') {
    tem = ua.match(/\bOPR|Edge\/(\d+)/);

    if (tem != null) {
      let version = tem[1];
      if (!version) {
        const splits = ua.split(tem[0] + '/');
        if (splits.length > 1) {
          version = splits[1];
        }
      }

      return { name: 'opera', version };
    }
  }
  M = M[2] ? [M[1], M[2]] : [navigator.appName, navigator.appVersion, '-?'];
  if ((tem = ua.match(/version\/(\d+)/i)) != null) {
    M.splice(1, 1, tem[1]);
  }
  return {
    name: M[0].toLowerCase(),
    version: M[1],
  };
}

export const activateServiceWorker: ServiceWorkerActivate = (): boolean => {
  const { name, version } = getBrowser();
  if (name === 'chrome' && parseInt(version) <= 70) {
    return false;
  }
  if (name === 'opera') {
    if (!version) {
      return false;
    }
    if (parseInt(version.split('.')[0]) < 80) {
      return false;
    }
  }
  if (name === 'ie') {
    return false;
  }

  const operatingSystem = getOperatingSystem(navigator);
  return !excludeOs(operatingSystem);
};