tatlock-ui/lib/features/security/presentation/pages/security_page.dart

import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:go_router/go_router.dart';
import 'package:tatlock_ui/features/security/router.dart';
import 'package:tatlock_ui/features/security/users/users_list_page.dart';
import 'package:tatlock_ui/features/security/groups/groups_list_page.dart';
import 'package:tatlock_ui/shared/layouts/widgets/nav_panel.dart';

/// Main Security room page with nav panel and section content.
class SecurityPage extends ConsumerWidget {
  const SecurityPage({
    super.key,
    this.nav = SecurityNav.users,
  });

  /// The current nav item to display.
  final SecurityNav nav;

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final colorScheme = Theme.of(context).colorScheme;

    return Scaffold(
      body: Row(
        children: [
          // Nav Panel - section navigation with grouping
          NavPanel(
            title: 'Sections',
            icon: Icons.security_outlined,
            items: SecurityNav.values.map((n) => n.toNavItem()).toList(),
            selectedId: nav.id,
            onItemSelected: (id) {
              final newNav = SecurityNav.values.firstWhere(
                (n) => n.id == id,
              );
              // Navigate to section URL
              context.go(pathForSecurityNav(newNav));
            },
          ),
          // Divider
          VerticalDivider(
            width: 1,
            thickness: 1,
            color: colorScheme.outlineVariant,
          ),
          // Section content
          Expanded(
            child: _SectionContent(nav: nav),
          ),
        ],
      ),
    );
  }
}

/// Renders content for the selected nav item.
class _SectionContent extends StatelessWidget {
  const _SectionContent({required this.nav});

  final SecurityNav nav;

  @override
  Widget build(BuildContext context) {
    switch (nav) {
      case SecurityNav.users:
        return const UsersListPage();
      case SecurityNav.groups:
        return const GroupsListPage();
      default:
        return _PlaceholderSection(nav: nav);
    }
  }
}

/// Placeholder for nav items not yet implemented.
class _PlaceholderSection extends StatelessWidget {
  const _PlaceholderSection({required this.nav});

  final SecurityNav nav;

  @override
  Widget build(BuildContext context) {
    final colorScheme = Theme.of(context).colorScheme;
    final textTheme = Theme.of(context).textTheme;

    return Center(
      child: Column(
        mainAxisSize: MainAxisSize.min,
        children: [
          Icon(
            nav.icon,
            size: 64,
            color: colorScheme.outline,
          ),
          const SizedBox(height: 16),
          Text(
            nav.label,
            style: textTheme.headlineSmall?.copyWith(
              color: colorScheme.onSurfaceVariant,
            ),
          ),
          const SizedBox(height: 8),
          Text(
            '${nav.section} • Coming soon',
            style: textTheme.bodyMedium?.copyWith(
              color: colorScheme.outline,
            ),
          ),
        ],
      ),
    );
  }
}