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polyfill for `KeyboardEvent.prototype.key`
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/* global define, KeyboardEvent, module */

(function () {

  var keyboardeventKeyPolyfill = {
    polyfill: polyfill,
    keys: {
      3: 'Cancel',
      6: 'Help',
      8: 'Backspace',
      9: 'Tab',
      12: 'Clear',
      13: 'Enter',
      16: 'Shift',
      17: 'Control',
      18: 'Alt',
      19: 'Pause',
      20: 'CapsLock',
      27: 'Escape',
      28: 'Convert',
      29: 'NonConvert',
      30: 'Accept',
      31: 'ModeChange',
      32: ' ',
      33: 'PageUp',
      34: 'PageDown',
      35: 'End',
      36: 'Home',
      37: 'ArrowLeft',
      38: 'ArrowUp',
      39: 'ArrowRight',
      40: 'ArrowDown',
      41: 'Select',
      42: 'Print',
      43: 'Execute',
      44: 'PrintScreen',
      45: 'Insert',
      46: 'Delete',
      48: ['0', ')'],
      49: ['1', '!'],
      50: ['2', '@'],
      51: ['3', '#'],
      52: ['4', '$'],
      53: ['5', '%'],
      54: ['6', '^'],
      55: ['7', '&'],
      56: ['8', '*'],
      57: ['9', '('],
      91: 'OS',
      93: 'ContextMenu',
      144: 'NumLock',
      145: 'ScrollLock',
      181: 'VolumeMute',
      182: 'VolumeDown',
      183: 'VolumeUp',
      186: [';', ':'],
      187: ['=', '+'],
      188: [',', '<'],
      189: ['-', '_'],
      190: ['.', '>'],
      191: ['/', '?'],
      192: ['`', '~'],
      219: ['[', '{'],
      220: ['\\', '|'],
      221: [']', '}'],
      222: ["'", '"'],
      224: 'Meta',
      225: 'AltGraph',
      246: 'Attn',
      247: 'CrSel',
      248: 'ExSel',
      249: 'EraseEof',
      250: 'Play',
      251: 'ZoomOut'
    }
  };

  // Function keys (F1-24).
  var i;
  for (i = 1; i < 25; i++) {
    keyboardeventKeyPolyfill.keys[111 + i] = 'F' + i;
  }

  // Printable ASCII characters.
  var letter = '';
  for (i = 65; i < 91; i++) {
    letter = String.fromCharCode(i);
    keyboardeventKeyPolyfill.keys[i] = [letter.toLowerCase(), letter.toUpperCase()];
  }

  function polyfill () {
    if (!('KeyboardEvent' in window) ||
        'key' in KeyboardEvent.prototype) {
      return false;
    }

    // Polyfill `key` on `KeyboardEvent`.
    var proto = {
      get: function (x) {
        var key = keyboardeventKeyPolyfill.keys[this.which || this.keyCode];

        if (Array.isArray(key)) {
          key = key[+this.shiftKey];
        }

        return key;
      }
    };
    Object.defineProperty(KeyboardEvent.prototype, 'key', proto);
    return proto;
  }

  if (typeof define === 'function' && define.amd) {
    define('keyboardevent-key-polyfill', keyboardeventKeyPolyfill);
  } else if (typeof exports !== 'undefined' && typeof module !== 'undefined') {
    module.exports = keyboardeventKeyPolyfill;
  } else if (window) {
    window.keyboardeventKeyPolyfill = keyboardeventKeyPolyfill;
  }

})();