claude_session_viewer/lib/widgets/navigation/app_shell.dart

import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import '../../providers/session_provider.dart';
import '../../screens/agents/agents_screen.dart';
import '../../screens/home/home_screen.dart';
import '../../screens/timeline/timeline_screen.dart';
import '../../screens/tokens/tokens_screen.dart';
import '../../screens/toolbelt/toolbelt_screen.dart';
import 'sidebar.dart';

class AppShell extends StatefulWidget {
  const AppShell({super.key});

  @override
  State<AppShell> createState() => _AppShellState();
}

class _AppShellState extends State<AppShell> {
  SidebarScreen _screen = SidebarScreen.home;

  void _onScreenSelected(SidebarScreen screen) {
    setState(() => _screen = screen);
  }

  void _onSessionLoaded() {
    setState(() => _screen = SidebarScreen.timeline);
  }

  @override
  Widget build(BuildContext context) {
    final provider = context.watch<SessionProvider>();
    final hasSession = provider.session != null;

    return Row(
      children: [
        Sidebar(
          selected: _screen,
          onSelect: _onScreenSelected,
          hasSession: hasSession,
        ),
        Expanded(
          child: _buildScreen(),
        ),
      ],
    );
  }

  Widget _buildScreen() {
    switch (_screen) {
      case SidebarScreen.home:
        return HomeScreen(onSessionLoaded: _onSessionLoaded);
      case SidebarScreen.timeline:
        return const TimelineScreen();
      case SidebarScreen.agents:
        return const AgentsScreen();
      case SidebarScreen.toolbelt:
        return const ToolbeltScreen();
      case SidebarScreen.tokens:
        return const TokensScreen();
    }
  }
}