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

header('Content-Type: application/json; charset=utf-8');
header('Cache-Control: no-store');

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

try {
    $metadataRepo = null;
    $pdo = modules()->modulePdo('kea', $fallback);
    if (!empty($metadataConfig['driver']) && !empty($metadataConfig['dbname'])) {
        try {
            $metadataRepo = new KeaHostMetadataRepository(Database::createFromArray($metadataConfig));
            $metadataRepo->ensureSchema();
        } catch (\Throwable) {
            $metadataRepo = null;
        }
    }

    $repo = new KeaHostRepository($pdo, $metadataRepo);
    $hosts = $repo->findAll(200);
    $stats = [
        'total' => $repo->countReservations() + $repo->countLeases(),
        'reservations' => $repo->countReservations(),
        'leases' => $repo->countLeases(),
        'groups' => [],
        'free_ips' => [],
    ];

    foreach ($hosts as $host) {
        $group = trim((string)($host['metadata']['group_name'] ?? ''));
        if ($group !== '') {
            $stats['groups'][$group] = ($stats['groups'][$group] ?? 0) + 1;
        }
    }

    if ($metadataRepo !== null) {
        $stats['free_ips'] = array_map(
            static fn(array $ips): int => count($ips),
            $metadataRepo->availableIpsByGroup(
                array_merge($repo->usedIpAddresses(), $metadataRepo->desiredIps()),
                4096
            )
        );
    }

    $rows = array_map(static function (array $host): array {
        return [
            'source' => (string)($host['source'] ?? 'reservation'),
            'host_id' => (string)($host['host_id'] ?? '0'),
            'display_name' => (string)($host['metadata']['device_name'] ?? $host['metadata']['real_name'] ?? $host['display_name'] ?? $host['hostname'] ?? 'Unbekannt'),
            'ipv4_address' => (string)($host['ipv4_address'] ?? ''),
            'dhcp_identifier' => (string)($host['dhcp_identifier'] ?? ''),
            'last_seen_at' => (string)($host['last_seen_at'] ?? '-'),
            'lease_expires_at' => (string)($host['lease_expires_at'] ?? '-'),
            'real_name' => (string)($host['metadata']['real_name'] ?? '-'),
            'location' => (string)($host['metadata']['location'] ?? '-'),
            'group_name' => (string)($host['metadata']['group_name'] ?? '-'),
        ];
    }, $hosts);

    echo json_encode([
        'ok' => true,
        'stats' => [
            'total' => (int)$stats['total'],
            'reservations' => (int)$stats['reservations'],
            'leases' => (int)$stats['leases'],
            'groups' => count($stats['groups']),
            'free_ips' => array_sum($stats['free_ips']),
        ],
        'rows' => $rows,
        'updated_at' => date('H:i:s'),
    ], JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
} catch (\Throwable $e) {
    http_response_code(500);
    echo json_encode([
        'ok' => false,
        'error' => $e->getMessage(),
    ], JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
}

exit;