<?php
use App\Database;
use App\Repository\KeaHostMetadataRepository;
use App\Repository\KeaHostRepository;

$module = modules()->get('kea');
$settings = modules()->settings('kea');
$fallback = $module['db_defaults'] ?? [];
$metadataFallback = is_array($module['metadata_db_defaults'] ?? null) ? $module['metadata_db_defaults'] : [];
$metadataConfig = is_array($settings['metadata_db'] ?? null)
    ? array_replace($metadataFallback, $settings['metadata_db'])
    : $metadataFallback;

$source = (string)($_GET['source'] ?? $_POST['source'] ?? 'reservation');
$source = $source === 'lease' ? 'lease' : 'reservation';
$id = (int)($_GET['id'] ?? $_POST['id'] ?? 0);
$error = null;
$notice = null;
$host = null;
$metadataRepo = null;
$groups = [];
$availableIpsByGroup = [];
$checks = [];
$hostKey = '';

try {
    $pdo = modules()->modulePdo('kea', $fallback);
    if (empty($metadataConfig['driver']) || empty($metadataConfig['dbname'])) {
        throw new RuntimeException('Nexus DHCP Zusatzdatenbank ist nicht konfiguriert.');
    }

    $metadataRepo = new KeaHostMetadataRepository(Database::createFromArray($metadataConfig));
    $metadataRepo->ensureSchema();
    $groups = $metadataRepo->listGroups();
    $repo = new KeaHostRepository($pdo, $metadataRepo);
    $host = $repo->findDisplayByKey($source, $id);
    if (!$host) {
        throw new RuntimeException('KEA Eintrag wurde nicht gefunden.');
    }
    $hostKey = $source . ':' . (string)($host['host_id'] ?? $id);

    if ($_SERVER['REQUEST_METHOD'] === 'POST') {
        $action = (string)($_POST['action'] ?? 'save_metadata');
        if ($action === 'dns_lookup') {
            $ip = (string)($host['ipv4_address'] ?? '');
            $hostname = trim((string)($host['metadata']['device_name'] ?? $host['hostname'] ?? ''));
            $reverse = $ip !== '' ? gethostbyaddr($ip) : '';
            $forward = $hostname !== '' ? gethostbyname($hostname) : '';
            $success = ($reverse !== '' && $reverse !== $ip) || ($forward !== '' && $forward !== $hostname);

            $metadataRepo->saveCheck($hostKey, 'dns', $success ? 'success' : 'warning', [
                'ip' => $ip,
                'hostname' => $hostname,
                'reverse' => $reverse,
                'forward' => $forward,
            ]);
            $notice = $success ? 'DNS-Pruefung gespeichert.' : 'DNS-Pruefung gespeichert, aber kein eindeutiger Name gefunden.';
        } else {
            $metadata = [
                'real_name' => $_POST['real_name'] ?? '',
                'device_name' => $_POST['device_name'] ?? '',
                'owner' => $_POST['owner'] ?? '',
                'location' => $_POST['location'] ?? '',
                'device_type' => $_POST['device_type'] ?? '',
                'group_name' => $_POST['group_name'] ?? '',
                'desired_ip' => $_POST['desired_ip'] ?? '',
                'notes' => $_POST['notes'] ?? '',
                'tags' => [],
            ];
            $desiredIp = trim((string)$metadata['desired_ip']);
            if ($desiredIp !== '') {
                $newHostId = $repo->reserveDisplayEntry($host, $desiredIp, $metadata);
                $source = 'reservation';
                $id = $newHostId;
                $notice = 'Zusatzdaten gespeichert und KEA-Reservierung gesetzt.';
            } else {
                $metadataRepo->saveForHost(
                    $id,
                    (string)($host['dhcp_identifier'] ?? ''),
                    (string)($host['ipv4_address'] ?? ''),
                    $metadata
                );
                $notice = 'Zusatzdaten gespeichert.';
            }
        }
        $host = $repo->findDisplayByKey($source, $id) ?: $host;
        $hostKey = $source . ':' . (string)($host['host_id'] ?? $id);
    }

    $usedIps = array_diff(
        array_merge($repo->usedIpAddresses(), $metadataRepo->desiredIps()),
        [(string)($host['ipv4_address'] ?? ''), (string)($host['metadata']['desired_ip'] ?? '')]
    );
    $availableIpsByGroup = $metadataRepo->availableIpsByGroup($usedIps);
    $checks = $metadataRepo->latestChecks([$hostKey])[$hostKey] ?? [];
} catch (Throwable $e) {
    $error = $e->getMessage();
}

$metadata = is_array($host['metadata'] ?? null) ? $host['metadata'] : [];
$selectedGroup = (string)($metadata['group_name'] ?? '');
$selectedIp = (string)($metadata['desired_ip'] ?? '');
?>
<?= module_shell_header('kea', [
    'title' => 'KEA Eintrag bearbeiten',
]) ?>
<div class="module-flow kea-page">
  <section class="module-box">
    <div class="module-box-head">
      <div>
        <h2 class="module-box-title">KEA Eintrag bearbeiten</h2>
        <p>Zusatzdaten werden separat von der KEA-Datenbank gespeichert.</p>
      </div>
      <div class="setup-actions">
        <a class="module-button module-button--secondary" href="/module/kea/groups">Gruppen verwalten</a>
        <a class="module-button module-button--secondary" href="/module/kea">Zurueck</a>
      </div>
    </div>
  </section>

  <?php if ($error): ?>
    <div class="kea-message kea-message--error" role="alert">
      <strong>Fehler</strong>
      <p><?= e($error) ?></p>
    </div>
  <?php elseif ($host): ?>
    <?php if ($notice): ?>
      <div class="kea-message kea-message--success">
        <?= e($notice) ?>
      </div>
    <?php endif; ?>

    <section class="module-box kea-panel">
      <div class="module-box-head kea-panel__head">
        <div>
          <span class="pill"><?= ($source === 'lease') ? 'Lease' : 'Reservierung' ?></span>
          <h2 class="module-box-title"><?= e((string)($host['hostname'] ?: 'Unbekannt')) ?></h2>
          <p class="muted">
            IP <?= e((string)($host['ipv4_address'] ?? '')) ?> · MAC <?= e((string)($host['dhcp_identifier'] ?? '')) ?>
          </p>
        </div>
      </div>

      <form method="post" class="kea-edit-form">
        <input type="hidden" name="action" value="save_metadata">
        <input type="hidden" name="source" value="<?= e($source) ?>">
        <input type="hidden" name="id" value="<?= e((string)$id) ?>">

        <label class="setup-field">
          <span>Echter Name</span>
          <input type="text" name="real_name" value="<?= e((string)($metadata['real_name'] ?? '')) ?>">
        </label>
        <label class="setup-field">
          <span>Gerätename</span>
          <input type="text" name="device_name" value="<?= e((string)($metadata['device_name'] ?? '')) ?>">
        </label>
        <label class="setup-field">
          <span>Besitzer</span>
          <input type="text" name="owner" value="<?= e((string)($metadata['owner'] ?? '')) ?>">
        </label>
        <label class="setup-field">
          <span>Standort</span>
          <input type="text" name="location" value="<?= e((string)($metadata['location'] ?? '')) ?>">
        </label>
        <label class="setup-field">
          <span>Gerätetyp</span>
          <input type="text" name="device_type" value="<?= e((string)($metadata['device_type'] ?? '')) ?>">
        </label>
        <label class="setup-field">
          <span>Gruppe</span>
          <select name="group_name" data-kea-group-select>
            <option value="">Bitte waehlen</option>
            <?php foreach ($groups as $group): ?>
              <option value="<?= e($group) ?>" <?= $selectedGroup === $group ? 'selected' : '' ?>><?= e($group) ?></option>
            <?php endforeach; ?>
          </select>
          <?php if ($groups === []): ?>
            <small class="muted">Noch keine Gruppen definiert. Oeffne zuerst Gruppen verwalten.</small>
          <?php endif; ?>
        </label>
        <label class="setup-field">
          <span>Feste IP</span>
          <select name="desired_ip" data-kea-ip-select data-selected-ip="<?= e($selectedIp) ?>">
            <option value="">Erst Gruppe waehlen</option>
          </select>
          <small class="muted">Es werden nur freie IPs aus dem IP-Bereich der gewaehlten Gruppe angeboten.</small>
        </label>
        <label class="setup-field kea-edit-form__wide">
          <span>Notizen</span>
          <textarea name="notes" rows="4"><?= e((string)($metadata['notes'] ?? '')) ?></textarea>
        </label>

        <div class="setup-actions kea-edit-form__wide">
          <button class="cta-button" type="submit">Speichern</button>
          <a class="nav-link" href="/module/kea">Abbrechen</a>
        </div>
      </form>
    </section>

    <section class="module-box kea-panel">
      <div class="module-box-head kea-panel__head">
        <div>
          <span class="pill">Pruefungen</span>
          <h2 class="module-box-title">Gerätechecks</h2>
          <p class="muted">Pruefergebnisse werden in der Nexus-DHCP-Datenbank gespeichert und koennen spaeter fuer Reports genutzt werden.</p>
        </div>
      </div>
      <div class="kea-check-grid">
        <div class="kea-check-card">
          <h4>DNS / Hostname</h4>
          <?php $dnsCheck = $checks['dns'] ?? null; ?>
          <?php if ($dnsCheck): ?>
            <?php $dnsResult = json_decode((string)($dnsCheck['result_json'] ?? '{}'), true) ?: []; ?>
            <p class="muted">Status: <?= e((string)($dnsCheck['status'] ?? '')) ?> · <?= e((string)($dnsCheck['checked_at'] ?? '')) ?></p>
            <p class="mono">Reverse: <?= e((string)($dnsResult['reverse'] ?? '-')) ?></p>
            <p class="mono">Forward: <?= e((string)($dnsResult['forward'] ?? '-')) ?></p>
          <?php else: ?>
            <p class="muted">Noch keine DNS-Pruefung gespeichert.</p>
          <?php endif; ?>
          <form method="post" class="setup-actions">
            <input type="hidden" name="action" value="dns_lookup">
            <input type="hidden" name="source" value="<?= e($source) ?>">
            <input type="hidden" name="id" value="<?= e((string)$id) ?>">
            <button class="nav-link" type="submit">DNS jetzt pruefen</button>
          </form>
        </div>
        <div class="kea-check-card">
          <h4>Login-Erkennung</h4>
          <p class="muted">Vorbereitet fuer spaetere HTTP/Port-Erkennung. Noch nicht automatisch aktiv, damit keine ungewollten Scans laufen.</p>
        </div>
      </div>
    </section>
    <script>
      (() => {
        const ipsByGroup = <?= json_encode($availableIpsByGroup, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE) ?>;
        const groupSelect = document.querySelector('[data-kea-group-select]');
        const ipSelect = document.querySelector('[data-kea-ip-select]');
        if (!groupSelect || !ipSelect) {
          return;
        }
        const selectedIp = ipSelect.dataset.selectedIp || '';
        const renderIps = () => {
          const ips = ipsByGroup[groupSelect.value] || [];
          ipSelect.innerHTML = '';
          const empty = document.createElement('option');
          empty.value = '';
          empty.textContent = groupSelect.value ? 'Keine feste IP' : 'Erst Gruppe waehlen';
          ipSelect.appendChild(empty);
          if (selectedIp && !ips.includes(selectedIp)) {
            ips.unshift(selectedIp);
          }
          for (const ip of ips) {
            const option = document.createElement('option');
            option.value = ip;
            option.textContent = ip;
            option.selected = ip === selectedIp;
            ipSelect.appendChild(option);
          }
        };
        groupSelect.addEventListener('change', renderIps);
        renderIps();
      })();
    </script>
  <?php endif; ?>
</div>
<?= module_shell_footer() ?>