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<?php

namespace Drupal\custom_csv_user_checker\Form;

use Drupal\Core\Form\FormBase;
use Drupal\Core\Form\FormStateInterface;
use Drupal\user\Entity\User;

class CustomCsvUserCheckerForm extends FormBase {

  public function getFormId() {
    return 'custom_csv_user_checker_form';
  }

  public function buildForm(array $form, FormStateInterface $form_state) {
    $form['csv_upload'] = [
      '#type' => 'file',
      '#title' => $this->t('Upload CSV File'),
      '#description' => $this->t('Upload a CSV file containing email addresses.'),
      '#upload_validators' => [
        'file_validate_extensions' => ['csv'],
      ],
    ];

    $form['submit'] = [
      '#type' => 'submit',
      '#value' => $this->t('Process CSV'),
    ];

    return $form;
  }

  public function submitForm(array &$form, FormStateInterface $form_state) {
    $csv_file = $form_state->getValue('csv_upload')[0];
    $file_path = \Drupal::service('file_system')->realpath($csv_file->getFileUri());
    $csv_data = array_map('str_getcsv', file($file_path));

    $header = [$this->t('Email'), $this->t('Username'), $this->t('Account Status')];
    $rows = [];

    foreach ($csv_data as $csv_row) {
      $email = $csv_row[0];
      $account = User::loadByProperties(['mail' => $email]);

      if (!empty($account)) {
        $account = reset($account);
        $username = $account->getAccountName();
        $status = $this->t('Account Present');
      } else {
        $username = '';
        $status = $this->t('Account Not Present');
      }

      $rows[] = [$email, $username, $status];
    }

    $form_state->set('results', [
      '#theme' => 'table',
      '#header' => $header,
      '#rows' => $rows,
    ]);
  }
}