import 'package:flutter/material.dart';
import 'package:flutter/cupertino.dart';
import 'package:device_info_plus/device_info_plus.dart';
import 'dart:io';

void main() => runApp(const MaterialApp(home: DeviceInfoScreen()));

class DeviceInfoScreen extends StatefulWidget {
  const DeviceInfoScreen({super.key});
  @override
  State createState() => _DeviceInfoScreenState();
}

class _DeviceInfoScreenState extends State {
  Map _info = {};

  @override
  void initState() {
    super.initState();
    _loadInfo();
  }

  Future _loadInfo() async {
    final plugin = DeviceInfoPlugin();
    Map info = {};

    if (Platform.isIOS) {
      final d = await plugin.iosInfo;
      info = {
        'Model': d.model,
        'OS': 'iOS ${d.systemVersion}',
        'Device': d.isPhysicalDevice ? 'Physical' : 'Simulator',
        'Name': d.name,
      };
    } else if (Platform.isAndroid) {
      final d = await plugin.androidInfo;
      info = {
        'Model': '${d.manufacturer} ${d.model}',
        'OS': 'Android ${d.version.release} (SDK ${d.version.sdkInt})',
        'Device': d.isPhysicalDevice ? 'Physical' : 'Emulator',
        'Brand': d.brand,
      };
    }
    setState(() => _info = info);
  }

  @override
  Widget build(BuildContext context) {
    final size = MediaQuery.sizeOf(context);
    final isIOS = Platform.isIOS;

    Widget card = Padding(
      padding: const EdgeInsets.all(24),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        mainAxisSize: MainAxisSize.min,
        children: [
          Text(isIOS ? '🍎 iOS Device' : '🤖 Android Device',
            style: const TextStyle(fontSize: 22, fontWeight: FontWeight.bold)),
          const SizedBox(height: 16),
          ..._info.entries.map((e) => Padding(
            padding: const EdgeInsets.symmetric(vertical: 4),
            child: Row(children: [
              SizedBox(width: 80, child: Text(e.key, style: const TextStyle(color: Colors.grey))),
              Text(e.value, style: const TextStyle(fontWeight: FontWeight.w500)),
            ]),
          )),
          const Divider(height: 24),
          Text('Screen: ${size.width.toInt()} × ${size.height.toInt()}px', style: const TextStyle(color: Colors.grey)),
        ],
      ),
    );

    return Scaffold(
      appBar: isIOS
        ? null
        : AppBar(title: const Text('Device Info')),
      body: isIOS
        ? CupertinoPageScaffold(
            navigationBar: const CupertinoNavigationBar(middle: Text('Device Info')),
            child: SafeArea(child: Center(child: CupertinoFormSection.insetGrouped(children: [
              CupertinoFormRow(prefix: const Text('Model'), child: Text(_info['Model'] ?? '...')),
              CupertinoFormRow(prefix: const Text('OS'), child: Text(_info['OS'] ?? '...')),
              CupertinoFormRow(prefix: const Text('Type'), child: Text(_info['Device'] ?? '...')),
            ]))),
          )
        : Center(child: Card(margin: const EdgeInsets.all(24), child: card)),
    );
  }
}

import 'dart:io';
import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';

void main() => runApp(const MaterialApp(home: ImagePickerScreen()));

class ImagePickerScreen extends StatefulWidget {
  const ImagePickerScreen({super.key});
  @override
  State createState() => _ImagePickerScreenState();
}

class _ImagePickerScreenState extends State {
  final _picker = ImagePicker();
  XFile? _image;
  int? _fileSizeKb;

  Future _pick(ImageSource source) async {
    try {
      final picked = await _picker.pickImage(source: source, imageQuality: 85, maxWidth: 1080);
      if (picked == null) return; // User cancelled
      final bytes = await picked.readAsBytes();
      setState(() {
        _image = picked;
        _fileSizeKb = bytes.lengthInBytes ~/ 1024;
      });
    } catch (e) {
      if (!mounted) return;
      showDialog(
        context: context,
        builder: (_) => AlertDialog(
          title: const Text('Permission Required'),
          content: Text('Camera/gallery access is needed. Please enable it in Settings. Error: $e'),
          actions: [
            TextButton(onPressed: () => Navigator.pop(context), child: const Text('Cancel')),
            TextButton(onPressed: () { Navigator.pop(context); /* openAppSettings(); */ }, child: const Text('Settings')),
          ],
        ),
      );
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Image Picker'), actions: [
        if (_image != null) IconButton(icon: const Icon(Icons.close), onPressed: () => setState(() { _image = null; _fileSizeKb = null; })),
      ]),
      body: Padding(
        padding: const EdgeInsets.all(24),
        child: Column(children: [
          Row(mainAxisAlignment: MainAxisAlignment.center, children: [
            if (!Platform.isLinux && !Platform.isWindows)
              ElevatedButton.icon(onPressed: () => _pick(ImageSource.camera), icon: const Icon(Icons.camera_alt), label: const Text('Camera')),
            const SizedBox(width: 16),
            OutlinedButton.icon(onPressed: () => _pick(ImageSource.gallery), icon: const Icon(Icons.photo_library), label: const Text('Gallery')),
          ]),
          const SizedBox(height: 24),
          Expanded(
            child: _image == null
              ? const Center(child: Column(mainAxisSize: MainAxisSize.min, children: [
                  Icon(Icons.add_photo_alternate, size: 80, color: Colors.grey),
                  SizedBox(height: 16),
                  Text('No image selected', style: TextStyle(color: Colors.grey)),
                ]))
              : Column(children: [
                  Expanded(child: ClipRRect(borderRadius: BorderRadius.circular(16),
                    child: Image.file(File(_image!.path), fit: BoxFit.contain))),
                  const SizedBox(height: 12),
                  Text('${_image!.name} • ${_fileSizeKb ?? '?'} KB',
                    style: const TextStyle(color: Colors.grey, fontSize: 13)),
                ]),
          ),
        ]),
      ),
    );
  }
}