import 'package:flutter/material.dart';
import 'package:chicken_farm/services/pda_service.dart';

class PdaDemoPage extends StatefulWidget {
  const PdaDemoPage({Key? key}) : super(key: key);

  @override
  State<PdaDemoPage> createState() => _PdaDemoPageState();
}

class _PdaDemoPageState extends State<PdaDemoPage> {
  final PdaService _pdaService = PdaService();
  String? _scanResult;
  String? _rfidResult;
  bool _isScanning = false;

  @override
  void initState() {
    super.initState();
    // 开始监听扫描结果
    _pdaService.startListeningScanResults();
    // 监听扫描结果流
    _pdaService.scanResults.listen((result) {
      setState(() {
        _scanResult = result;
        _isScanning = false;
      });
    });
  }

  @override
  void dispose() {
    // 停止监听扫描结果
    _pdaService.stopListeningScanResults();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('PDA功能演示'),
      ),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: [
            // 扫描功能区域
            Card(
              child: Padding(
                padding: const EdgeInsets.all(16.0),
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.stretch,
                  children: [
                    const Text(
                      '条码扫描',
                      style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
                    ),
                    const SizedBox(height: 16),
                    ElevatedButton(
                      onPressed: _isScanning
                          ? null
                          : () {
                              setState(() {
                                _isScanning = true;
                                _scanResult = null;
                              });
                              _pdaService.scanBarcode();
                            },
                      child: _isScanning
                          ? const Row(
                              mainAxisAlignment: MainAxisAlignment.center,
                              children: [
                                SizedBox(
                                  width: 20,
                                  height: 20,
                                  child: CircularProgressIndicator(
                                    strokeWidth: 2,
                                    valueColor:
                                        AlwaysStoppedAnimation<Color>(Colors.white),
                                  ),
                                ),
                                SizedBox(width: 10),
                                Text('扫描中...')
                              ],
                            )
                          : const Text('触发扫描'),
                    ),
                    const SizedBox(height: 16),
                    const Text('扫描结果:'),
                    const SizedBox(height: 8),
                    Container(
                      padding: const EdgeInsets.all(12),
                      decoration: BoxDecoration(
                        border: Border.all(color: Colors.grey),
                        borderRadius: BorderRadius.circular(4),
                      ),
                      child: Text(
                        _scanResult ?? '暂无扫描结果',
                        style: TextStyle(
                          color: _scanResult == null ? Colors.grey : Colors.black,
                        ),
                      ),
                    ),
                  ],
                ),
              ),
            ),
            const SizedBox(height: 20),
            // RFID功能区域
            Card(
              child: Padding(
                padding: const EdgeInsets.all(16.0),
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.stretch,
                  children: [
                    const Text(
                      'RFID读写',
                      style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
                    ),
                    const SizedBox(height: 16),
                    ElevatedButton(
                      onPressed: () async {
                        setState(() {
                          _rfidResult = null;
                        });
                        final rfid = await _pdaService.readRfid();
                        setState(() {
                          _rfidResult = rfid;
                        });
                      },
                      child: const Text('读取RFID'),
                    ),
                    const SizedBox(height: 16),
                    ElevatedButton(
                      onPressed: () async {
                        setState(() {
                          _rfidResult = null;
                        });
                        final result = await _pdaService.writeRfid('TestData123');
                        setState(() {
                          _rfidResult = result;
                        });
                      },
                      child: const Text('写入RFID'),
                    ),
                    const SizedBox(height: 16),
                    const Text('RFID结果:'),
                    const SizedBox(height: 8),
                    Container(
                      padding: const EdgeInsets.all(12),
                      decoration: BoxDecoration(
                        border: Border.all(color: Colors.grey),
                        borderRadius: BorderRadius.circular(4),
                      ),
                      child: Text(
                        _rfidResult ?? '暂无RFID结果',
                        style: TextStyle(
                          color: _rfidResult == null ? Colors.grey : Colors.black,
                        ),
                      ),
                    ),
                  ],
                ),
              ),
            ),
          ],
        ),
      ),
    );
  }
}