<?php declare(strict_types = 1);

namespace Drupal\opencase;
use Drupal\user\Entity\User;

class EmailAlerter {
    public function send_email_to_users_with_role(array $params, string $key, string $role): void {
        $mailManager = \Drupal::service('plugin.manager.mail');
        $module = 'goodnightout_opencase';
        $to = implode(',', $this->get_email_addresses_of_users_with_role($role));
        $send = true;
        $result = $mailManager->mail($module, $key, $to, NULL, $params, NULL, $send);
        if ($result['result'] != true) {
            $message = t('There was a problem sending your email notification to @email.', array('@email' => $to));
            \Drupal::messenger()->addMessage($message, 'error');
            \Drupal::logger('mail-log')->error($message);
            return;
        }
        $message = t('An email notification has been sent to @email ', array('@email' => $to));
        \Drupal::messenger()->addMessage($message);
        \Drupal::logger('mail-log')->notice($message);
    }
    
    private function get_email_addresses_of_users_with_role(string $role): array {
        $email_addresses = [];
        $ids = \Drupal::entityQuery('user')
            ->condition('status', 1)
            ->condition('roles', $role)
            ->execute();
            $users = User::loadMultiple($ids);
            foreach($users as $user){
                $email_addresses[] = $user->getEmail();
            } 
        return $email_addresses;
    }
}