external-cam/lib/home_screen.dart

import 'package:flutter/material.dart';

import 'package:external_cam/camera_screen.dart';
import 'package:external_cam/viewer_screen.dart';

class HomeScreen extends StatelessWidget {
  const HomeScreen({super.key});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('External Cam')),
      body: Center(
        child: Padding(
          padding: const EdgeInsets.all(32),
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              _ModeCard(
                icon: Icons.camera_alt,
                title: 'Camera',
                subtitle: 'Stream this device\'s camera over USB',
                onTap: () => Navigator.push(
                  context,
                  MaterialPageRoute(builder: (_) => const CameraScreen()),
                ),
              ),
              const SizedBox(height: 24),
              _ModeCard(
                icon: Icons.tv,
                title: 'Viewer',
                subtitle: 'View the camera stream from a connected device',
                onTap: () => Navigator.push(
                  context,
                  MaterialPageRoute(builder: (_) => const ViewerScreen()),
                ),
              ),
              const SizedBox(height: 32),
              Text(
                'Connect both devices with USB-C, then enable\n'
                'USB tethering on the camera device.',
                textAlign: TextAlign.center,
                style: Theme.of(context).textTheme.bodySmall,
              ),
            ],
          ),
        ),
      ),
    );
  }
}

class _ModeCard extends StatelessWidget {
  const _ModeCard({
    required this.icon,
    required this.title,
    required this.subtitle,
    required this.onTap,
  });

  final IconData icon;
  final String title;
  final String subtitle;
  final VoidCallback onTap;

  @override
  Widget build(BuildContext context) {
    return Card(
      child: InkWell(
        onTap: onTap,
        borderRadius: BorderRadius.circular(12),
        child: Padding(
          padding: const EdgeInsets.all(32),
          child: Row(
            children: [
              Icon(icon, size: 48),
              const SizedBox(width: 24),
              Expanded(
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    Text(
                      title,
                      style: Theme.of(context).textTheme.headlineSmall,
                    ),
                    Text(subtitle),
                  ],
                ),
              ),
              const Icon(Icons.chevron_right),
            ],
          ),
        ),
      ),
    );
  }
}