import 'package:flutter/material.dart';
import 'dart:async';

import 'package:flutter/services.dart';
import 'package:ch34/ch34.dart';

void main() {
  runApp(const MyApp());
}

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

  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  String _platformVersion = 'Unknown';
  List<UsbDeviceInfo> _devices = [];
  String _status = '未连接';
  String _receivedData = '';

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

  Future<void> initPlatformState() async {
    String platformVersion;
    try {
      platformVersion =
          await Ch34Manager.getPlatformVersion() ?? 'Unknown platform version';
    } on PlatformException {
      platformVersion = 'Failed to get platform version.';
    }

    if (!mounted) return;

    setState(() {
      _platformVersion = platformVersion;
    });
  }

  Future<void> _scanDevices() async {
    try {
      final devices = await Ch34Manager.enumDevice();
      setState(() {
        _devices = devices;
        _status = '发现 ${devices.length} 个设备';
      });
    } catch (e) {
      setState(() {
        _status = '扫描失败: $e';
      });
    }
  }

  Future<void> _openDevice(String deviceName) async {
    try {
      final success = await Ch34Manager.openDevice(deviceName);
      if (success) {
        await Ch34Manager.setSerialParameter(
          deviceName,
          0,
          const SerialParameter(baud: 115200),
        );

        await Ch34Manager.registerDataCallback(
          deviceName,
          0,
          (Uint8List data) {
            final hex = data.map((b) => b.toRadixString(16).padLeft(2, '0')).join(' ');
            setState(() {
              _receivedData = '收到: $hex';
            });
          },
        );

        setState(() {
          _status = '已连接: $deviceName';
        });
      } else {
        setState(() {
          _status = '打开失败';
        });
      }
    } catch (e) {
      setState(() {
        _status = '连接失败: $e';
      });
    }
  }

  Future<void> _sendData(String deviceName) async {
    try {
      final data = Uint8List.fromList([0x01, 0x02, 0x03]);
      final sent = await Ch34Manager.writeData(deviceName, 0, data);
      setState(() {
        _status = '已发送 $sent 字节';
      });
    } catch (e) {
      setState(() {
        _status = '发送失败: $e';
      });
    }
  }

  Future<void> _disconnect(String deviceName) async {
    try {
      Ch34Manager.removeDataCallback(deviceName);
      await Ch34Manager.disconnect(deviceName);
      setState(() {
        _status = '已断开';
      });
    } catch (e) {
      setState(() {
        _status = '断开失败: $e';
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('CH34X 示例'),
        ),
        body: SingleChildScrollView(
          padding: const EdgeInsets.all(16),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Text('平台版本: $_platformVersion\n'),
              Text('状态: $_status\n'),
              if (_receivedData.isNotEmpty)
                Text('接收数据: $_receivedData\n'),
              const SizedBox(height: 16),
              ElevatedButton(
                onPressed: _scanDevices,
                child: const Text('扫描设备'),
              ),
              const SizedBox(height: 8),
              if (_devices.isNotEmpty)
                ListView.builder(
                  shrinkWrap: true,
                  physics: const NeverScrollableScrollPhysics(),
                  itemCount: _devices.length,
                  itemBuilder: (context, index) {
                    final device = _devices[index];
                    return ListTile(
                      title: Text('${device.deviceName}'),
                      subtitle: Text(
                          'VID: 0x${device.vendorId.toRadixString(16).toUpperCase()} '
                          'PID: 0x${device.productId.toRadixString(16).toUpperCase()} '
                          '端口: ${device.serialCount}'),
                      trailing: Row(
                        mainAxisSize: MainAxisSize.min,
                        children: [
                          IconButton(
                            icon: const Icon(Icons.power),
                            onPressed: () => _openDevice(device.deviceName),
                          ),
                          IconButton(
                            icon: const Icon(Icons.send),
                            onPressed: _status.contains('已连接')
                                ? () => _sendData(device.deviceName)
                                : null,
                          ),
                          IconButton(
                            icon: const Icon(Icons.power_off),
                            onPressed: _status.contains('已连接')
                                ? () => _disconnect(device.deviceName)
                                : null,
                          ),
                        ],
                      ),
                    );
                  },
                ),
            ],
          ),
        ),
      ),
    );
  }
}