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export class Utils {
  /**
   * @static
   * @param {*} value
   * @param {*} [strict=false]
   * @returns {boolean}
   * @memberof Utils
   *
   * Under the rule of strict the values of object and arrays will be checked as well
   * Also Number 0 under strict will return false
   * Example:
   *    Utils.IsEmpty(['', '', {}, [{}]]) === true;
   */
  static IsEmpty(value: any, strict: any = false): boolean {
    if (typeof strict !== 'boolean') {
      strict = false;
    }
    const type = (typeof value).toLocaleLowerCase();
    if (type !== 'number' && !Boolean(value)) {
      return true;
    }
    switch (type) {
      case 'object':
        if (Array.isArray(value)) {
          if (strict) {
            return value.every(arrayValue => Utils.IsEmpty(arrayValue));
          }
          return Boolean(value.length === 0);
        }
        if (strict) {
          return Object.keys(value)
              .filter(objectKey => Boolean(value[objectKey]))
              .every(objectKey => Utils.IsEmpty(value[objectKey]));
        }
        return Boolean(Object.keys(value).length === 0);
      case 'string':
        return Boolean(value.length === 0);
      case 'number':
        return strict ? false : Boolean(value);

      default:
        return false;
    }
  }

  static NotEmpty(value: any): boolean {
    return !Utils.IsEmpty(value);
  }

  static IsEmptyDeep(value: any): boolean {
    return Utils.IsEmpty(value, true);
  }

  static NotEmptyDeep(value: any): boolean {
    return !Utils.IsEmptyDeep(value);
  }
}