<?php
namespace SendMails;

defined('ABSPATH') || exit;

/**
 * Lästige Mails von WordPress selbst abschalten, je einzeln (Standard: alles wie WordPress). Nur ueber die
 * Filter und Aktionen, die WordPress dafuer vorsieht; Mails von Plugins bleiben unberuehrt.
 */
final class Systemmails
{
    /** Schluessel => [Bezeichnung, Erklaerung] fuer die Einstellungen. */
    public static function arten(): array
    {
        return [
            'neuer_benutzer_admin'     => [__('Admin: new user registered', 'purehost-send-mails'), __('WordPress tells the administrator about every new user account.', 'purehost-send-mails')],
            'passwort_admin'           => [__('Admin: user reset their password', 'purehost-send-mails'), __('WordPress tells the administrator when a user has reset their password.', 'purehost-send-mails')],
            'update_erfolg'            => [__('Admin: successful automatic updates', 'purehost-send-mails'), __('Reports about successful automatic updates of WordPress, plugins and themes. Failed updates are still reported.', 'purehost-send-mails')],
            'passwort_geaendert_nutzer' => [__('User: password was changed', 'purehost-send-mails'), __('Confirmation to the user after a password change. Security notice: it warns users if someone else changed their password.', 'purehost-send-mails')],
            'email_geaendert_nutzer'   => [__('User: email address was changed', 'purehost-send-mails'), __('Notice to the old address after an email change. Security notice: it warns users if someone else took over their account.', 'purehost-send-mails')],
        ];
    }

    public static function registrieren(): void
    {
        $aus = array_flip((array) Einstellungen::wert('systemmails_aus'));
        if (isset($aus['neuer_benutzer_admin'])) {
            add_filter('wp_send_new_user_notification_to_admin', '__return_false');
        }
        if (isset($aus['passwort_admin'])) {
            add_action('init', static function (): void {
                remove_action('after_password_reset', 'wp_password_change_notification');
            });
        }
        if (isset($aus['update_erfolg'])) {
            add_filter('auto_core_update_send_email', static fn($senden, $art) => $art === 'success' ? false : $senden, 10, 2);
            add_filter('auto_plugin_update_send_email', [self::class, 'nurFehler'], 10, 2);
            add_filter('auto_theme_update_send_email', [self::class, 'nurFehler'], 10, 2);
        }
        if (isset($aus['passwort_geaendert_nutzer'])) {
            add_filter('send_password_change_email', '__return_false');
        }
        if (isset($aus['email_geaendert_nutzer'])) {
            add_filter('send_email_change_email', '__return_false');
        }
    }

    /** Update-Mail fuer Plugins/Themes nur, wenn ein Update fehlgeschlagen ist. */
    public static function nurFehler($senden, $ergebnisse)
    {
        foreach ((array) $ergebnisse as $e) {
            $r = is_object($e) ? ($e->result ?? null) : null;
            if ($r === false || $r === null || is_wp_error($r)) {
                return $senden;
            }
        }
        return false;
    }
}