<?php

namespace App\Services\Dns;

use RuntimeException;

class FakeHostDnsDirectory implements HostDnsDirectory
{
    /** @var array<string, string> name => ip */
    public array $ips = [];

    /** @var array<string, string> name => fqdn */
    public array $fqdns = [];

    public bool $failWrite = false;

    public bool $failRemove = false;

    /** @var array<string, array<int, string>> key => fqdns */
    public array $groups = [];

    public function write(string $name, string $fqdn, string $ip): void
    {
        if ($this->failWrite) {
            throw new RuntimeException('dns-hosts volume unavailable');
        }

        $this->ips[$name] = $ip;
        $this->fqdns[$name] = $fqdn;
    }

    public function remove(string $name): void
    {
        if ($this->failRemove) {
            throw new RuntimeException('dns-hosts volume unavailable');
        }

        unset($this->ips[$name], $this->fqdns[$name]);
    }

    public function writeMany(string $key, array $fqdns, string $ip): void
    {
        if ($this->failWrite) {
            throw new RuntimeException('dns-hosts volume unavailable');
        }

        if ($fqdns === []) {
            // FileHostDnsDirectory::writeMany() ruft bei einer leeren Liste
            // remove() auf, und remove() loescht die Datei komplett — nicht
            // nur die Zeilen darin, die als IP-Zuordnung durchgingen. Ohne
            // $fqdns hier mit zu leeren, wich der Fake vom echten Verhalten
            // ab: ein Test haette `$fake->fqdns[$key]` noch stehen sehen,
            // waehrend die echte Datei laengst weg war.
            unset($this->groups[$key], $this->ips[$key], $this->fqdns[$key]);

            return;
        }

        $this->groups[$key] = array_values($fqdns);
        $this->ips[$key] = $ip;
    }
}