Refactored static resolvers to Util (#1517)

* ready event will now throw errors properly

* ws login rejection fix

* moved static resolves to util

src/util/Util.js

@@ -207,6 +207,85 @@ class Util {
     }
     return array.indexOf(element);
   }
+
+  /**
+   * Data that can be resolved to give a string. This can be:
+   * * A string
+   * * An array (joined with a new line delimiter to give a string)
+   * * Any value
+   * @typedef {string|Array|*} StringResolvable
+   */
+
+  /**
+   * Resolves a StringResolvable to a string.
+   * @param {StringResolvable} data The string resolvable to resolve
+   * @returns {string}
+   */
+
+  static resolveString(data) {
+    if (typeof data === 'string') return data;
+    if (data instanceof Array) return data.join('\n');
+    return String(data);
+  }
+
+  /**
+   * Can be a Hex Literal, Hex String, Number, RGB Array, or one of the following
+   * ```
+   * [
+   *   'DEFAULT',
+   *   'AQUA',
+   *   'GREEN',
+   *   'BLUE',
+   *   'PURPLE',
+   *   'GOLD',
+   *   'ORANGE',
+   *   'RED',
+   *   'GREY',
+   *   'DARKER_GREY',
+   *   'NAVY',
+   *   'DARK_AQUA',
+   *   'DARK_GREEN',
+   *   'DARK_BLUE',
+   *   'DARK_PURPLE',
+   *   'DARK_GOLD',
+   *   'DARK_ORANGE',
+   *   'DARK_RED',
+   *   'DARK_GREY',
+   *   'LIGHT_GREY',
+   *   'DARK_NAVY',
+   *   'RANDOM',
+   * ]
+   * ```
+   * or something like
+   * ```
+   * [255, 0, 255]
+   * ```
+   * for purple
+   * @typedef {string|number|Array} ColorResolvable
+   */
+
+  /**
+   * Resolves a ColorResolvable into a color number.
+   * @param {ColorResolvable} color Color to resolve
+   * @returns {number} A color
+   */
+
+  static resolveColor(color) {
+    if (typeof color === 'string') {
+      if (color === 'RANDOM') return Math.floor(Math.random() * (0xFFFFFF + 1));
+      color = Constants.Colors[color] || parseInt(color.replace('#', ''), 16);
+    } else if (color instanceof Array) {
+      color = (color[0] << 16) + (color[1] << 8) + color[2];
+    }
+
+    if (color < 0 || color > 0xFFFFFF) {
+      throw new RangeError('Color must be within the range 0 - 16777215 (0xFFFFFF).');
+    } else if (color && isNaN(color)) {
+      throw new TypeError('Unable to convert color to a number.');
+    }
+
+    return color;
+  }
 }
 
 module.exports = Util;