<?php
class FormValidator
{
  /*
  * Private members
  */

  private array $fields;

  /*
  * Constructor
  */

  public function __construct(FieldValidator ...$fields)
  {
    $this->fields = $fields;
  }

  /*
  * Fluent Style
  */

  public static function create(FieldValidator ...$fields)
  {
    return new FormValidator(...$fields);
  }

  /*
  * Methods
  */

  public function isValid()
  {
    foreach ($this->fields as $field) {
      if (!$field->isValid) return false;
    }

    return true;
  }

  public function getErrors()
  {
    $errors = [];

    foreach ($this->fields as $field) {
      if (!$field->isValid()) array_push($errors, $field->getError());
    }

    return $errors;
  }

  public function getField(string $name)
  {
    $field = current(array_filter($this->fields, fn ($field) => strcmp($field->getName(), $name) === 0));
    if ($field !== false) {
      return $field;
    }

    return "No field named $name";
  }
}