<?php
declare(strict_types=1);
require_once __DIR__ . '/common.php';

api_require_method('GET', 'POST');
$staff = api_require_staff();
api_require_admin_or_permission($staff, 'manage_help_topics');
$pdo = get_db();

if ($_SERVER['REQUEST_METHOD'] === 'GET') {
    $topics = $pdo->query(
        'SELECT h.*, d.name AS department_name, p.name AS priority_name, p.color AS priority_color
         FROM help_topics h
         JOIN departments d ON d.id = h.department_id
         JOIN priorities p ON p.id = h.priority_id
         ORDER BY h.sort_order, h.name'
    )->fetchAll();
    $departments = departments_for_select($pdo, array_map('intval', $pdo->query('SELECT department_id FROM help_topics')->fetchAll(PDO::FETCH_COLUMN)));
    $priorities = $pdo->query('SELECT id, name FROM priorities ORDER BY sort_order')->fetchAll();
    $names = array_column($topics, 'name', 'id');
    $parents = array_column($topics, 'parent_id', 'id');
    $pathOf = function (int $id) use ($names, $parents): string {
        $parts = []; $seen = [];
        while ($id && isset($names[$id]) && !isset($seen[$id])) { $seen[$id] = true; array_unshift($parts, $names[$id]); $id = (int) ($parents[$id] ?? 0); }
        return implode(' / ', $parts);
    };

    api_json([
        'departments' => array_map(fn(array $d) => ['id' => (int) $d['id'], 'name' => $d['name']], $departments),
        'priorities' => array_map(fn(array $p) => ['id' => (int) $p['id'], 'name' => $p['name']], $priorities),
        'slaPlans' => array_map(fn(array $p) => ['id' => (int) $p['id'], 'name' => $p['name']], $pdo->query('SELECT id, name FROM sla_plans WHERE is_active = 1 ORDER BY name')->fetchAll()),
        'items' => array_map(fn(array $t) => [
            'id' => (int) $t['id'],
            'name' => $t['name'],
            'departmentId' => (int) $t['department_id'],
            'departmentName' => $t['department_name'],
            'priorityId' => (int) $t['priority_id'],
            'priorityName' => $t['priority_name'],
            'priorityColor' => $t['priority_color'],
            'isActive' => (bool) $t['is_active'],
            'isPublic' => (bool) ($t['is_public'] ?? 1),
            'slaPlanId' => !empty($t['sla_plan_id']) ? (int) $t['sla_plan_id'] : null,
            'parentId' => !empty($t['parent_id']) ? (int) $t['parent_id'] : null,
            'path' => $pathOf((int) $t['id']),
            'notes' => $t['notes'] ?? null,
            'sortOrder' => (int) $t['sort_order'],
            'createdAt' => $t['created_at'] ?? null,
            'updatedAt' => $t['updated_at'] ?? null,
        ], $topics),
    ]);
}

$body = api_request_body();
$action = $body['action'] ?? '';
$id = (int) ($body['id'] ?? 0);

try {
    if ($action === 'save') {
        $in = [
            'name' => $body['name'] ?? '', 'department_id' => $body['departmentId'] ?? 0, 'priority_id' => $body['priorityId'] ?? 0,
            'sort_order' => $body['sortOrder'] ?? 0,
        ];
        // Fehlende Schlüssel (ältere App-Version) lassen den bisherigen Wert unverändert
        foreach (['isActive' => 'is_active', 'isPublic' => 'is_public', 'parentId' => 'parent_id', 'slaPlanId' => 'sla_plan_id', 'notes' => 'notes'] as $camel => $snake) {
            if (array_key_exists($camel, $body)) $in[$snake] = $body[$camel];
        }
        $newId = help_topic_save($pdo, $id, $in);
        audit_log($staff['id'], ($id === 0 ? 'Hilfethema erstellt: ' : 'Hilfethema aktualisiert: ') . trim((string) ($body['name'] ?? '')) . ' (Mobile App)');
        api_json(['id' => $newId]);
    }
    if ($action === 'delete') {
        $deleted = help_topic_delete($pdo, $id);
        audit_log($staff['id'], "Hilfethema gelöscht: {$deleted} (Mobile App)");
        api_json(['ok' => true]);
    }
} catch (AdminModelException $e) {
    api_error($e->httpStatus(), $e->errorCode(), $e->getMessage());
}

api_error(422, 'INVALID_ACTION', 'Unbekannte Aktion.');