import 'dart:async';
import 'dart:developer' as developer;
import 'dart:io';

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:get/get.dart';
import 'package:permission_handler/permission_handler.dart';
import 'package:device_info_plus/device_info_plus.dart';
import 'package:path_provider/path_provider.dart';
import 'package:flutter_dotenv/flutter_dotenv.dart';

import '../../data/services/voice_recognition_service.dart';

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

  @override
  State<SpeechDemoPage> createState() => _SpeechDemoPageState();
}

class _SpeechDemoPageState extends State<SpeechDemoPage> {
  late final VoiceRecognitionService _voiceService;
  bool _isInitialized = false;
  bool _isRecognizing = false;
  String _recognizedText = '';
  String _statusMessage = '准备就绪';
  
  @override
  void initState() {
    super.initState();
    _initializeService();
  }
  
  Future<void> _initializeService() async {
    setState(() {
      _statusMessage = '正在初始化语音服务...';
    });
    
    try {
      // 创建服务实例（这一步会自动从环境变量加载配置）
      _voiceService = VoiceRecognitionService();
      
      // 初始化语音识别服务
      final result = await _voiceService.initialize();
      
      setState(() {
        _isInitialized = result;
        _statusMessage = '语音服务初始化成功，可以开始识别';
      });
    } catch (e) {
      setState(() {
        _isInitialized = false;
        _statusMessage = '初始化失败: $e';
      });
    }
  }
  
  Future<void> _startVoiceRecognition() async {
    if (!_isInitialized) {
      setState(() {
        _statusMessage = '语音服务未初始化，请先初始化';
      });
      return;
    }
    
    setState(() {
      _isRecognizing = true;
      _statusMessage = '正在聆听...';
    });
    
    try {
      final result = await _voiceService.recognizeSpeech();
      setState(() {
        _recognizedText = result;
        _isRecognizing = false;
        _statusMessage = '识别完成';
      });
    } catch (e) {
      setState(() {
        _isRecognizing = false;
        _statusMessage = '识别失败: $e';
      });
    }
  }
  
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('语音识别演示'),
      ),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: [
            // 状态信息
            Container(
              padding: const EdgeInsets.all(12),
              decoration: BoxDecoration(
                color: Colors.grey[200],
                borderRadius: BorderRadius.circular(8),
              ),
              child: Text(
                _statusMessage,
                style: TextStyle(
                  color: _isInitialized ? Colors.green[700] : Colors.red[700],
                  fontWeight: FontWeight.bold,
                ),
              ),
            ),
            
            const SizedBox(height: 24),
            
            // 识别结果显示区域
            Expanded(
              child: Container(
                padding: const EdgeInsets.all(16),
                decoration: BoxDecoration(
                  border: Border.all(color: Colors.grey[300]!),
                  borderRadius: BorderRadius.circular(8),
                ),
                child: _recognizedText.isEmpty
                    ? const Center(
                        child: Text(
                          '识别结果将显示在这里',
                          style: TextStyle(color: Colors.grey),
                        ),
                      )
                    : SingleChildScrollView(
                        child: Text(
                          _recognizedText,
                          style: const TextStyle(
                            fontSize: 18,
                            height: 1.5,
                          ),
                        ),
                      ),
              ),
            ),
            
            const SizedBox(height: 24),
            
            // 操作按钮
            Row(
              mainAxisAlignment: MainAxisAlignment.spaceEvenly,
              children: [
                ElevatedButton(
                  onPressed: _isRecognizing ? null : _initializeService,
                  style: ElevatedButton.styleFrom(
                    padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 12),
                  ),
                  child: const Text('重新初始化'),
                ),
                ElevatedButton(
                  onPressed: _isRecognizing || !_isInitialized ? null : _startVoiceRecognition,
                  style: ElevatedButton.styleFrom(
                    padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 12),
                    backgroundColor: Colors.blue[700],
                  ),
                  child: Text(_isRecognizing ? '正在识别...' : '开始语音识别'),
                ),
              ],
            ),
            
            const SizedBox(height: 16),
            
            // 提示信息
            const Text(
              '提示：请在安静的环境中使用，并确保已授予应用录音权限。',
              style: TextStyle(
                fontSize: 12,
                fontStyle: FontStyle.italic,
                color: Colors.grey,
              ),
              textAlign: TextAlign.center,
            ),
          ],
        ),
      ),
    );
  }
}