<?php

namespace App\Support\WoltGuard;

class MonitClient
{
    private string $url;
    private int    $timeout;

    public function __construct(string $host = '127.0.0.1', int $port = 2812, int $timeout = 3)
    {
        $this->url     = "http://{$host}:{$port}/_status?format=xml";
        $this->timeout = $timeout;
    }

    /**
     * Returns array of service rows: ['name'=>, 'label'=>, 'hint'=>, 'ok'=>bool]
     * Only process-type services (type=3) are included.
     * Returns empty array if Monit is unreachable.
     */
    public function services(): array
    {
        $xml = $this->fetch();
        if ($xml === null) return [];

        $labelMap = [
            'postfix'  => ['label' => 'Postfix',  'hint' => 'MTA / Versand'],
            'dovecot'  => ['label' => 'Dovecot',  'hint' => 'IMAP / POP3'],
            'mariadb'  => ['label' => 'MariaDB',  'hint' => 'Datenbank'],
            'redis'    => ['label' => 'Redis',    'hint' => 'Cache / Queue'],
            'rspamd'   => ['label' => 'Rspamd',   'hint' => 'Spamfilter'],
            'opendkim' => ['label' => 'OpenDKIM', 'hint' => 'DKIM-Signatur'],
            'nginx'    => ['label' => 'Nginx',    'hint' => 'Webserver'],
        ];

        $rows = [];
        foreach ($xml->service as $svc) {
            if ((int) $svc['type'] !== 3) continue; // nur Prozesse

            $name  = (string) $svc->name;
            $ok    = (int) $svc->status === 0;
            $meta  = $labelMap[$name] ?? ['label' => ucfirst($name), 'hint' => ''];

            $rows[] = [
                'name'  => $name,
                'label' => $meta['label'],
                'hint'  => $meta['hint'],
                'ok'    => $ok,
            ];
        }

        return $rows;
    }

    public function reachable(): bool
    {
        return $this->fetch() !== null;
    }

    private function fetch(): ?\SimpleXMLElement
    {
        $ctx = stream_context_create(['http' => [
            'timeout'        => $this->timeout,
            'ignore_errors'  => true,
        ]]);

        $raw = @file_get_contents($this->url, false, $ctx);
        if ($raw === false || $raw === '') return null;

        try {
            $prev = libxml_use_internal_errors(true);
            $xml  = simplexml_load_string($raw);
            libxml_use_internal_errors($prev);
            return $xml instanceof \SimpleXMLElement ? $xml : null;
        } catch (\Throwable) {
            return null;
        }
    }
}