<?php
namespace SendMails;

defined('ABSPATH') || exit;

/**
 * Pruefungen im WordPress-Bildschirm "Website-Zustand" (Werkzeuge) und ein Abschnitt in dessen Bericht:
 * Versand eingeschaltet und verbunden, kein anderes Mail-Plugin, Absenderdomain verifiziert, Warteschlange
 * und angehaltene Mails. Nur zwischengespeicherte API-Antworten, keine Zugangsdaten im Bericht.
 */
final class Zustand
{
    public static function registrieren(): void
    {
        add_filter('site_status_tests', [self::class, 'tests']);
        add_filter('debug_information', [self::class, 'bericht']);
    }

    public static function tests(array $tests): array
    {
        $tests['direct']['sendmails_versand'] = ['label' => __('Sending via send-mails.de', 'purehost-send-mails'), 'test' => [self::class, 'versand']];
        $tests['direct']['sendmails_domain'] = ['label' => __('send-mails.de sender domain', 'purehost-send-mails'), 'test' => [self::class, 'domain']];
        $tests['direct']['sendmails_warteschlange'] = ['label' => __('send-mails.de queue', 'purehost-send-mails'), 'test' => [self::class, 'warteschlange']];
        return $tests;
    }

    private static function ergebnis(string $test, string $status, string $label, string $text): array
    {
        return [
            'label'       => $label,
            'status'      => $status,
            'badge'       => ['label' => __('Email', 'purehost-send-mails'), 'color' => $status === 'good' ? 'blue' : ($status === 'critical' ? 'red' : 'orange')],
            'description' => '<p>' . esc_html($text) . '</p>',
            'actions'     => '<p><a href="' . esc_url(Admin\Seite::url()) . '">' . esc_html__('Open send-mails.de', 'purehost-send-mails') . '</a></p>',
            'test'        => $test,
        ];
    }

    public static function versand(): array
    {
        $fremd = Versand::fremdesMailPlugin();
        if ($fremd !== null) {
            /* translators: %s: plugin name */
            return self::ergebnis('sendmails_versand', 'critical', sprintf(__('%s handles email sending instead of send-mails.de', 'purehost-send-mails'), $fremd),
                __('Two plugins replace the WordPress mail function. Deactivate the other mail plugin so that emails go through send-mails.de.', 'purehost-send-mails'));
        }
        if (!Einstellungen::versandAktiv()) {
            return self::ergebnis('sendmails_versand', 'recommended', __('Sending via send-mails.de is off', 'purehost-send-mails'),
                __('WordPress sends emails without send-mails.de. Finish the setup and turn on sending.', 'purehost-send-mails'));
        }
        if (Einstellungen::verloreneFelder()) {
            return self::ergebnis('sendmails_versand', 'critical', __('send-mails.de credentials can no longer be read', 'purehost-send-mails'),
                __('The security keys in wp-config.php have changed. Enter the API key again.', 'purehost-send-mails'));
        }
        $k = Einstellungen::apiSchluessel() !== '' ? Api::kontingentGespeichert() : null;
        if ($k && $k['ok'] && (($k['daten']['status'] ?? 'aktiv') !== 'aktiv' || !empty($k['daten']['missbrauch_gesperrt']))) {
            return self::ergebnis('sendmails_versand', 'critical', __('send-mails.de account suspended', 'purehost-send-mails'),
                __('send-mails.de does not accept emails from this website at the moment. Details are in the customer portal.', 'purehost-send-mails'));
        }
        return self::ergebnis('sendmails_versand', 'good', __('Emails are sent via send-mails.de', 'purehost-send-mails'),
            __('All emails of this website go through send-mails.de, with delivery status, bounce handling and protection against mass sending.', 'purehost-send-mails'));
    }

    public static function domain(): array
    {
        $absender = strtolower((string) Einstellungen::wert('absender_email'));
        $domain = substr((string) strrchr($absender, '@'), 1);
        $verifiziert = Api::bekannteDomains();
        if ($domain === '' || $verifiziert === null) {
            return self::ergebnis('sendmails_domain', 'recommended', __('send-mails.de sender not set up yet', 'purehost-send-mails'),
                __('Choose a sender address of a domain verified at send-mails.de.', 'purehost-send-mails'));
        }
        if (!in_array($domain, $verifiziert, true)) {
            /* translators: %s: domain */
            return self::ergebnis('sendmails_domain', 'critical', sprintf(__('Sender domain %s is not verified', 'purehost-send-mails'), $domain),
                __('Emails with this sender are not accepted. Check the DNS entries on the send-mails.de page.', 'purehost-send-mails'));
        }
        /* translators: %s: domain */
        return self::ergebnis('sendmails_domain', 'good', sprintf(__('Sender domain %s is verified', 'purehost-send-mails'), $domain),
            __('Emails are signed for this domain (DKIM) and bounces go to its return path.', 'purehost-send-mails'));
    }

    public static function warteschlange(): array
    {
        $angehalten = Bremse::angehalten();
        if ($angehalten) {
            return self::ergebnis('sendmails_warteschlange', 'critical', __('Emails held because of unusually many emails', 'purehost-send-mails'),
                __('A plugin or theme suddenly sent far more emails than usual. Decide on the send-mails.de page whether to send or discard them.', 'purehost-send-mails'));
        }
        $aufgegeben = Warteschlange::anzahl('aufgegeben');
        if ($aufgegeben > 0) {
            /* translators: %d: count */
            return self::ergebnis('sendmails_warteschlange', 'recommended', sprintf(_n('%d email could not be delivered', '%d emails could not be delivered', $aufgegeben, 'purehost-send-mails'), $aufgegeben),
                __('send-mails.de could not accept these emails even after 24 hours. Details are on the send-mails.de page.', 'purehost-send-mails'));
        }
        $wartet = Warteschlange::anzahl('wartet');
        if ($wartet > 0) {
            /* translators: %d: count */
            return self::ergebnis('sendmails_warteschlange', 'recommended', sprintf(_n('%d email is waiting in the queue', '%d emails are waiting in the queue', $wartet, 'purehost-send-mails'), $wartet),
                __('The plugin retries automatically for up to 24 hours.', 'purehost-send-mails'));
        }
        return self::ergebnis('sendmails_warteschlange', 'good', __('No emails waiting at send-mails.de', 'purehost-send-mails'),
            __('The local queue is empty.', 'purehost-send-mails'));
    }

    /** Abschnitt im Bericht von "Website-Zustand" (zum Kopieren fuer den Support), ohne Zugangsdaten. */
    public static function bericht(array $info): array
    {
        $o = Einstellungen::alle();
        $stand = Abgleich::stand();
        $janein = static fn(bool $w): string => $w ? __('yes', 'purehost-send-mails') : __('no', 'purehost-send-mails');
        $info['sendmails'] = [
            'label'  => 'send-mails.de',
            'fields' => [
                'version'       => ['label' => __('Version', 'purehost-send-mails'), 'value' => SENDMAILS_VERSION],
                'aktiv'         => ['label' => __('Sending on', 'purehost-send-mails'), 'value' => $janein(Einstellungen::versandAktiv())],
                'api'           => ['label' => __('API key set', 'purehost-send-mails'), 'value' => $janein(Einstellungen::apiSchluessel() !== '')],
                'absender'      => ['label' => __('Sender', 'purehost-send-mails'), 'value' => (string) $o['absender_email']],
                'hosts'         => ['label' => __('Mail servers', 'purehost-send-mails'), 'value' => (string) count(Einstellungen::smtpHosts())],
                'fremd'         => ['label' => __('Other mail plugin', 'purehost-send-mails'), 'value' => Versand::fremdesMailPlugin() ?? '–'],
                'warteschlange' => ['label' => __('Queue', 'purehost-send-mails'), 'value' => sprintf('%d / %d / %d', Warteschlange::anzahl('wartet'), Warteschlange::anzahl('angehalten'), Warteschlange::anzahl('aufgegeben')),
                    'debug' => 'wartet/angehalten/aufgegeben'],
                'abgleich'      => ['label' => __('Last sync', 'purehost-send-mails'), 'value' => (string) $stand['letzter_lauf'] . ($stand['fehler'] !== '' ? ' (' . $stand['fehler'] . ')' : '')],
                'bremse'        => ['label' => __('Protection against mass sending', 'purehost-send-mails'), 'value' => $o['bremse'] ? (string) (int) $o['bremse_min'] . ' / h' : __('off', 'purehost-send-mails')],
                'warnungen'     => ['label' => __('Warnings by email', 'purehost-send-mails'), 'value' => $janein((bool) $o['warnungen'])],
            ],
        ];
        return $info;
    }
}