import { FormValidatorFn } from './validator.types';

export function MinLength(length: number, message?: string): FormValidatorFn {
  return (_: string, value: unknown) => {
    let isValid = true;
    if (value != null && typeof value === 'string' && value.length < length)
      isValid = false;
    return {
      isValid,
      message: message || `Must be at least ${length} characters long`,
    };
  };
}

export function MaxLength(length: number, message?: string): FormValidatorFn {
  return (_: string, value: unknown) => {
    let isValid = true;
    if (value != null && typeof value === 'string' && value.length > length)
      isValid = false;
    return {
      isValid,
      message: message || `Must be less than ${length} characters long`,
    };
  };
}

export function IsRequired(message?: string): FormValidatorFn {
  return (_: string, value: unknown) => {
    return {
      isValid: !!value,
      message: message || `Field is required`,
    };
  };
}

export function IsEmail(message?: string): FormValidatorFn {
  return (_: string, value: unknown) => {
    let isValid = value != null && /\S+@\S+\.\S+/.test(value as string);
    return {
      isValid,
      message: message || `Must be a valid email address`,
    };
  };
}