import 'package:flutter/material.dart';
import 'package:get/get.dart';
import '../data/services/microsoft_tts_service.dart';

/// 微软 TTS 示例页面
class MicrosoftTtsExample extends StatefulWidget {
  const MicrosoftTtsExample({Key? key}) : super(key: key);

  @override
  State<MicrosoftTtsExample> createState() => _MicrosoftTtsExampleState();
}

class _MicrosoftTtsExampleState extends State<MicrosoftTtsExample> {
  final TextEditingController _textController = TextEditingController();
  final MicrosoftTtsService _ttsService = Get.find<MicrosoftTtsService>();
  
  // 语音列表
  final List<Map<String, String>> _voices = [
    {'name': '晓晓（女声）', 'value': 'zh-CN-XiaoxiaoNeural'},
    {'name': '云扬（男声）', 'value': 'zh-CN-YunyangNeural'},
    {'name': '晓双（女声）', 'value': 'zh-CN-XiaoshuangNeural'},
    {'name': '云皓（男声）', 'value': 'zh-CN-YunhaoNeural'},
    {'name': '晓墨（女声）', 'value': 'zh-CN-XiaomoNeural'},
    {'name': '云泽（男声）', 'value': 'zh-CN-YunzeNeural'},
  ];
  
  String _selectedVoice = 'zh-CN-XiaoxiaoNeural';
  double _rate = 0;
  double _pitch = 0;
  bool _isLoading = false;
  String _statusMessage = '';
  
  @override
  void initState() {
    super.initState();
    _textController.text = '欢迎使用微软语音合成服务，这是一个示例文本。';
  }
  
  @override
  void dispose() {
    _textController.dispose();
    super.dispose();
  }
  
  /// 播放文本
  Future<void> _speakText() async {
    if (_textController.text.isEmpty) {
      _showSnackBar('请输入要合成的文本');
      return;
    }
    
    setState(() {
      _isLoading = true;
      _statusMessage = '正在合成语音...';
    });
    
    try {
      // 设置语音
      await _ttsService.setVoice(_selectedVoice);
      
      // 生成 SSML
      final ssml = _ttsService.generateSsml(
        text: _textController.text,
        rate: _rate.round(),
        pitch: _pitch.round(),
      );
      
      // 播放 SSML
      final result = await _ttsService.speakSsml(ssml);
      
      setState(() {
        _statusMessage = result;
      });
    } catch (e) {
      _showSnackBar('语音合成失败: $e');
    } finally {
      setState(() {
        _isLoading = false;
      });
    }
  }
  
  /// 显示提示信息
  void _showSnackBar(String message) {
    ScaffoldMessenger.of(context).showSnackBar(
      SnackBar(content: Text(message)),
    );
  }
  
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('微软语音合成示例'),
      ),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: [
            // 文本输入框
            TextField(
              controller: _textController,
              maxLines: 5,
              decoration: const InputDecoration(
                labelText: '输入要合成的文本',
                border: OutlineInputBorder(),
              ),
            ),
            const SizedBox(height: 16),
            
            // 语音选择
            DropdownButtonFormField<String>(
              value: _selectedVoice,
              decoration: const InputDecoration(
                labelText: '选择语音',
                border: OutlineInputBorder(),
              ),
              items: _voices.map((voice) {
                return DropdownMenuItem<String>(
                  value: voice['value'],
                  child: Text(voice['name']!),
                );
              }).toList(),
              onChanged: (value) {
                if (value != null) {
                  setState(() {
                    _selectedVoice = value;
                  });
                }
              },
            ),
            const SizedBox(height: 16),
            
            // 语速调节
            Row(
              children: [
                const Text('语速:'),
                Expanded(
                  child: Slider(
                    min: -100,
                    max: 100,
                    divisions: 20,
                    value: _rate,
                    label: _rate.round().toString(),
                    onChanged: (value) {
                      setState(() {
                        _rate = value;
                      });
                    },
                  ),
                ),
                Text('${_rate.round()}%'),
              ],
            ),
            
            // 音调调节
            Row(
              children: [
                const Text('音调:'),
                Expanded(
                  child: Slider(
                    min: -100,
                    max: 100,
                    divisions: 20,
                    value: _pitch,
                    label: _pitch.round().toString(),
                    onChanged: (value) {
                      setState(() {
                        _pitch = value;
                      });
                    },
                  ),
                ),
                Text('${_pitch.round()}%'),
              ],
            ),
            
            const SizedBox(height: 16),
            
            // 播放按钮
            ElevatedButton(
              onPressed: _isLoading ? null : _speakText,
              child: _isLoading
                  ? const CircularProgressIndicator()
                  : const Text('播放'),
            ),
            
            const SizedBox(height: 16),
            
            // 状态信息
            Text(
              _statusMessage,
              style: const TextStyle(fontStyle: FontStyle.italic),
              textAlign: TextAlign.center,
            ),
          ],
        ),
      ),
    );
  }
}