import { Validators, ValidatorFn, AbstractControl, ValidationErrors } from '@angular/forms';

function isEmptyInputValue(value: any): boolean {
  return value == null || value.length === 0;
}

/**
 * 验证器
 *
 * @export
 * @class NaValidators
 * @extends {Validators}
 */
export class NaValidators extends Validators {

  static password(c: string | AbstractControl): ValidatorFn {
    const vf = function(control: AbstractControl): ValidationErrors | null {
      const password: string = control.value;
      if (isEmptyInputValue(password)) {
        return null;
      }
      if (password.match('^(?!([a-zA-Z]+|\\d+|[#@!~%^&*]+)$)[a-zA-Z\\d#@!~%^&*]{8,20}$')) {
        return null;
      }
      return { 'password': { 'errorMsg': '密码为8-20位数字及字母组合' } };
    };
    return vf;
  }

}