<?php

namespace Drupal\convoca_user\Form;
use Drupal\Core\Form\FormBase;
use Drupal\Core\Form\FormStateInterface;

class UserForm extends FormBase {
    /**
     * {@inheritdoc}
     */
    public function getFormId() {
        return 'form_custom_user';
    }

    public function buildForm(array $form, FormStateInterface $form_state) {
        $form['name'] = array(
            '#type' => 'textfield',
            '#title' => t('Name:'),
            '#required' => TRUE,
        );
        $form['mail'] = array(
            '#type' => 'email',
            '#title' => t('Email:'),
            '#required' => TRUE,
        );
        $form['password'] = array(
            '#type' => 'password',
            '#title' => t('Password:'),
            '#required' => TRUE,
        );
        $form['actions']['submit'] = array(
            '#type' => 'submit',
            '#value' => $this->t('Save'),
            '#button_type' => 'primary',
        );
        return $form;
    }

    public function validateForm(array &$form, FormStateInterface $form_state) {
        if (strlen($form_state->getValue('password')) < 10) {
            $form_state->setErrorByName('password', $this->t('This password is very short'));
        }
    }

    public function submitForm(array &$form, FormStateInterface $form_state) {
        $lang = \Drupal::languageManager()->getCurrentLanguage()->getId();
        $user = \Drupal\user\Entity\User::create();

        /*
         The Basics options for creation custom user.
         @TODO is the best way for get value and save user?
        */
        $user->setUsername($form_state->getValue('name'));
        $user->setEmail($form_state->getValue('mail'));
        $user->setPassword($form_state->getValue('password'));
        $user->enforceIsNew();  // Set this to FALSE if you want to edit (resave) an existing user object
        $user->activate(); // Is for active my user, there is more options, but these are the basics
        $user->save();
        foreach ($form_state->getValues() as $key => $value) {
            drupal_set_message($key . ': ' . $value); // Print values
        }
    }
}