/***
 * 
 * a trimmed down version (~812 bytes minified, not gzipped) of: https://github.com/matthewhudson/current-device/blob/master/src/index.js
 * to determine current device is mobile, tablet or desktop
 * USAGE: 
 * 1. prebuilt property: `window.device.type` returns "mobile", "tablet" or "desktop"
 * 2. could call `window.device.mobile()` or `window.device.tablet()` or `window.device.desktop()` to check for each
 * 3. other methods such as `window.device.windows()`, `window.device.windowsPhone()`, `window.device.android()`, `window.device.blackberry()`
 */

(function() {
  var uAgent = window.navigator.userAgent.toLowerCase();
  function find(needle) { return uAgent.indexOf(needle) !== -1; }

  window.device = {
    windows: function() { return find('windows'); },
    windowsPhone: function() { return this.windows() && find('phone'); },
    android: function() { return !this.windows() && find('android'); },
    blackberry: function() { return find('blackberry') || find('bb10') || find('rim'); },
    fxos: function() { return (find('(mobile') || find('(tablet')) && find(' rv:');},
    mobile: function() {
      return (
        (this.android() && find('mobile')) ||
        (!this.windows() && find('iphone')) ||
        find('ipod') ||
        (this.windows() && find('phone')) ||
        (this.blackberry() && !find('tablet')) ||
        (this.fxos() && find('mobile')) ||
        find('meego')
      );
    },
    tablet: function() {
      return (
        find('ipad') ||
        (this.android() && !find('mobile')) ||
        (this.blackberry() && find('tablet')) ||
        (this.windows() && (find('touch') && !this.windowsPhone())) ||
        (this.fxos() && find('tablet'))
      );
    },
    desktop: function() {
      return !this.tablet() && !this.mobile();
    },
    findMatch: function (arr) {
      for (let i = 0; i < arr.length; i++) {
        if (this[arr[i]]()) {
          return arr[i];
        }
      }
      return 'unknown';
    }
  };
  var type = device.findMatch(['mobile', 'tablet', 'desktop']);
  window.device.type = type;
})();