<?php
$moduleName = 'pihole';
$assets = app()->assets();
$assets->addStyle('/module/pihole/asset?file=pihole.css');
$assets->addScript('/module/pihole/asset?file=pihole_instances.js', 'footer', true);

require_admin();

$settings = modules()->settings($moduleName);
$notice = null;
$error = null;

$loadInstances = function (array $settings): array {
    $instances = [];
    $rawJson = trim((string)($settings['instances_json'] ?? ''));
    if ($rawJson !== '') {
        $decoded = json_decode($rawJson, true);
        if (is_array($decoded)) {
            foreach ($decoded as $row) {
                if (!is_array($row)) {
                    continue;
                }
                $id = trim((string)($row['id'] ?? ''));
                $url = trim((string)($row['url'] ?? ''));
                if ($id === '' || $url === '') {
                    continue;
                }
                $instances[$id] = [
                    'id' => $id,
                    'name' => trim((string)($row['name'] ?? '')) ?: $id,
                    'url' => $url,
                    'token' => trim((string)($row['token'] ?? '')),
                    'is_primary' => !empty($row['is_primary']),
                ];
            }
        }
    }

    if (!$instances) {
        foreach (['primary', 'secondary'] as $key) {
            $url = trim((string)($settings[$key . '_url'] ?? ''));
            if ($url === '') {
                continue;
            }
            $instances[$key] = [
                'id' => $key,
                'name' => trim((string)($settings[$key . '_name'] ?? '')) ?: ($key === 'primary' ? 'Primaer' : 'Sekundaer'),
                'url' => $url,
                'token' => trim((string)($settings[$key . '_token'] ?? '')),
                'is_primary' => $key === 'primary',
            ];
        }
    }

    return $instances;
};

$instances = $loadInstances($settings);

$sanitizeId = function (string $id): string {
    $id = preg_replace('/[^a-zA-Z0-9_-]/', '', $id);
    return trim((string)$id);
};

$saveInstances = function (array $settings, array $instances): void {
    $payload = $settings;
    $payload['instances_json'] = json_encode(array_values($instances), JSON_UNESCAPED_UNICODE);
    modules()->saveSettings('pihole', $payload);
};

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $deleteId = trim((string)($_POST['delete_id'] ?? ''));
    $currentId = trim((string)($_POST['current_id'] ?? ''));
    $instanceId = trim((string)($_POST['instance_id'] ?? ''));
    $name = trim((string)($_POST['name'] ?? ''));
    $url = trim((string)($_POST['url'] ?? ''));
    $token = trim((string)($_POST['token'] ?? ''));
    $isPrimary = isset($_POST['is_primary']);

    if ($deleteId !== '') {
        if (isset($instances[$deleteId])) {
            unset($instances[$deleteId]);
            $notice = 'Instanz geloescht.';
        }
    } else {
        $instanceId = $sanitizeId($instanceId);
        if ($instanceId === '' || $url === '') {
            $error = 'Bitte ID und URL angeben.';
        } else {
            $existingToken = '';
            if ($currentId !== '' && isset($instances[$currentId])) {
                $existingToken = (string)($instances[$currentId]['token'] ?? '');
            }
            $tokenToStore = $token !== '' ? $token : $existingToken;
            if ($currentId !== '' && $currentId !== $instanceId) {
                unset($instances[$currentId]);
            }
            $instances[$instanceId] = [
                'id' => $instanceId,
                'name' => $name !== '' ? $name : $instanceId,
                'url' => $url,
                'token' => $tokenToStore,
                'is_primary' => $isPrimary,
            ];

            if ($isPrimary) {
                foreach ($instances as $id => &$row) {
                    $row['is_primary'] = ($id === $instanceId);
                }
                unset($row);
                $settings['primary_id'] = $instanceId;
            }

            $notice = $currentId !== '' ? 'Instanz aktualisiert.' : 'Instanz gespeichert.';
        }
    }

    if (!$error) {
        $saveInstances($settings, $instances);
        $settings = modules()->settings($moduleName);
        $instances = $loadInstances($settings);
    }
}

$primaryId = trim((string)($settings['primary_id'] ?? ''));
if ($primaryId === '') {
    foreach ($instances as $id => $row) {
        if (!empty($row['is_primary'])) {
            $primaryId = $id;
            break;
        }
    }
}
?>
<div class="card">
  <div class="pill">Pi-hole</div>
  <div style="display:flex; align-items:center; justify-content:space-between; gap:12px; flex-wrap:wrap; margin-top:.75rem;">
    <h1 style="margin:0;">Instanzen</h1>
    <div style="display:flex; gap:10px; flex-wrap:wrap;">
      <button class="cta-button" type="button" data-instance-new>+ Neue Instanz</button>
    </div>
  </div>
  <p class="muted">Pi-hole Instanzen hinzufuegen, bearbeiten und loeschen.</p>

  <?php if ($error): ?>
    <div class="card notice-card" style="margin-top:1rem; border-color:#ffb4a8; background:#fff5f3; color:#7a2114;">
      <?= e($error) ?>
    </div>
  <?php elseif ($notice): ?>
    <div class="card notice-card" style="margin-top:1rem; border-color:var(--accent-2);">
      <?= e($notice) ?>
    </div>
  <?php endif; ?>

  <div class="pihole-instance-grid" style="margin-top:1rem;">
    <?php if (!$instances): ?>
      <div class="card" style="padding:16px;">Keine Instanzen vorhanden.</div>
    <?php else: ?>
      <?php foreach ($instances as $instance): ?>
        <div class="card pihole-instance-card"
             data-instance-id="<?= e((string)$instance['id']) ?>"
             data-name="<?= e((string)($instance['name'] ?? '')) ?>"
             data-url="<?= e((string)($instance['url'] ?? '')) ?>"
             data-primary="<?= !empty($instance['is_primary']) ? '1' : '0' ?>">
          <div class="pihole-instance-header">
            <div>
              <strong><?= e((string)($instance['name'] ?? '')) ?></strong>
              <div class="muted">ID: <?= e((string)($instance['id'] ?? '')) ?></div>
              <div class="muted">URL: <?= e((string)($instance['url'] ?? '')) ?></div>
            </div>
            <?php if (!empty($instance['is_primary']) || $instance['id'] === $primaryId): ?>
              <span class="pihole-status">Primaer</span>
            <?php endif; ?>
          </div>
          <div class="pihole-card-actions">
            <button class="nav-link" type="button" data-instance-edit>Bearbeiten</button>
            <button class="nav-link" type="button" data-instance-test>Test Verbindung</button>
            <form method="post" onsubmit="return confirm('Instanz wirklich loeschen?')">
              <input type="hidden" name="delete_id" value="<?= e((string)($instance['id'] ?? '')) ?>">
              <button class="nav-link" type="submit">Loeschen</button>
            </form>
          </div>
          <div class="pihole-test-result" data-instance-result></div>
        </div>
      <?php endforeach; ?>
    <?php endif; ?>
  </div>
</div>

<div class="modal" data-instance-modal aria-hidden="true">
  <div class="modal-card">
    <div class="modal-header">
      <strong data-instance-modal-title>Neue Instanz</strong>
      <button class="icon-button" type="button" data-instance-close>×</button>
    </div>
    <form method="post" class="form-grid" style="margin-top:.75rem;" data-instance-form>
      <input type="hidden" name="current_id" value="">
      <label class="form-field">
        <span class="muted">ID</span>
        <input type="text" name="instance_id" placeholder="z.B. pihole-main" required>
      </label>
      <label class="form-field">
        <span class="muted">Name</span>
        <input type="text" name="name" placeholder="z.B. Pi-hole Main" required>
      </label>
      <label class="form-field">
        <span class="muted">URL</span>
        <input type="text" name="url" placeholder="http://pi-hole.local" required>
      </label>
      <label class="form-field">
        <span class="muted">API Token / Web-Passwort (v6) (leer lassen = unveraendert)</span>
        <input type="password" name="token" placeholder="Token" autocomplete="new-password">
      </label>
      <label class="form-field" style="align-items:center;">
        <span class="muted">Als Primaer verwenden</span>
        <input type="checkbox" name="is_primary" value="1">
      </label>
      <div style="display:flex; gap:10px; flex-wrap:wrap;">
        <button class="cta-button" type="submit" data-instance-submit>Speichern</button>
        <button class="nav-link" type="button" data-instance-cancel>Zuruecksetzen</button>
      </div>
    </form>
  </div>
</div>