class Validator {
  // private constructor to avoid create class object
  Validator._();

  // check if string not empty and has value
  static bool hasValue(String? string) {
    if (string == null || string.isEmpty) return false;
    return true;
  }

  // Return true if email is valid. Otherwise, return false
  static bool isEmail(String email) {
    RegExp exp = RegExp(r"^[a-zA-Z0-9.a-zA-Z0-9.!#$%&'*+-/=?^_`{|}~]+@[a-zA-Z0-9]+\.[a-zA-Z]+");
    if (exp.hasMatch(email)) return true;
    return false;
  }

  // Return true if phone number is valid. Otherwise, return false
  static bool isPhoneNumber(String phoneNumber) {
    if (phoneNumber.isEmpty) {
      return false;
    }

    const pattern = r'^[+]*[(]{0,1}[0-9]{1,4}[)]{0,1}[-\s\./0-9]*$';
    final regExp = RegExp(pattern);

    if (regExp.hasMatch(phoneNumber)) return true;
    return false;
  }

  // Return true if password is valid. Otherwise, return false
  static bool isValidPassword(String password) {
    if (password.length < 6) return false;
    return true;
  }

  // Return true if String is valid Numeric. Otherwise, return false
  static bool isNumeric(String s) {
    return double.tryParse(s) != null;
  }

  // Return true if String is valid Numeric. Otherwise, return false
  static bool isInt(String value) {
    return int.tryParse(value) != null;
  }
}