import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'dart:math';
import 'package:audio_waveforms/audio_waveforms.dart';
import '../controllers/chat_controller.dart';
import '../models/message_model.dart';
import '../../../core/theme/app_colors.dart';
import '../../../core/widgets/message_bubble.dart';

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

  @override
  State<ChatView> createState() => _ChatViewState();
}

class _ChatViewState extends State<ChatView> with TickerProviderStateMixin {
  // 获取控制器
  ChatController get controller => Get.find<ChatController>();

  // 添加ScrollController用于控制滚动
  final ScrollController _scrollController = ScrollController();
  
  // 添加一个动画控制器，用于波形动画
  late final AnimationController _waveAnimationController;
  
  // 添加录音控制器，用于获取麦克风数据
  late final RecorderController _recorderController;
  
  @override
  void initState() {
    super.initState();
    
    // 初始化动画控制器
    _waveAnimationController = AnimationController(
      vsync: this,
      duration: const Duration(milliseconds: 1000),
    )..repeat();
    
    // 初始化录音控制器
    _recorderController = RecorderController()
      ..androidEncoder = AndroidEncoder.aac
      ..androidOutputFormat = AndroidOutputFormat.mpeg4
      ..iosEncoder = IosEncoder.kAudioFormatMPEG4AAC
      ..sampleRate = 44100
      ..bitRate = 128000
      ..updateFrequency = const Duration(milliseconds: 50); // 更新频率
    
    // 初始化录音控制器
    _initializeRecorder();
    
    // 监听消息列表变化，自动滚动到底部
    ever(controller.messages, (_) {
      // 使用Future.delayed确保在UI更新后滚动
      Future.delayed(Duration(milliseconds: 50), () {
        if (_scrollController.hasClients && 
            _scrollController.position.maxScrollExtent > 0 &&
            (_scrollController.position.maxScrollExtent - _scrollController.offset) < 200) {
          _scrollController.animateTo(
            _scrollController.position.maxScrollExtent,
            duration: Duration(milliseconds: 100),
            curve: Curves.easeOut,
          );
        }
      });
    });
    
    // 监听语音识别状态变化
    ever(controller.isVoiceRecognitionActive, (isActive) {
      if (isActive) {
        // 开始录音以获取波形数据
        _recorderController.record();
      } else {
        // 停止录音
        _recorderController.stop();
      }
    });
  }
  
  // 初始化录音控制器
  Future<void> _initializeRecorder() async {
    try {
      // 请求录音权限
      await _recorderController.checkPermission();
      
      // 如果当前正在进行语音识别，开始录音
      if (controller.isVoiceRecognitionActive.value) {
        await _recorderController.record();
      }
    } catch (e) {
      print('初始化录音控制器失败: $e');
    }
  }
  
  @override
  void dispose() {
    _scrollController.dispose();
    _waveAnimationController.dispose();
    _recorderController.dispose();
    super.dispose();
  }
  
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.white, // 设置Scaffold背景为白色
      appBar: AppBar(
        leading: IconButton(
          icon: Icon(Icons.arrow_back_ios, color: Colors.black),
          onPressed: () => Get.back(),
        ),
        title: Row(
          children: [
            CircleAvatar(
              backgroundImage: AssetImage(controller.agent.avatarUrl),
              radius: 18.r,
            ),
            SizedBox(width: 10.w),
            Expanded(
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                mainAxisSize: MainAxisSize.min,
                children: [
                  Text(
                    controller.agent.name,
                    style: TextStyle(
                      fontSize: 16.sp,
                      fontWeight: FontWeight.bold,
                      color: Colors.black,
                    ),
                  ),
                  Text(
                    controller.agent.description.length > 20
                        ? '${controller.agent.description.substring(0, 20)}...'
                        : controller.agent.description,
                    style: TextStyle(
                      fontSize: 12.sp,
                      color: Colors.grey,
                    ),
                    maxLines: 1,
                    overflow: TextOverflow.ellipsis,
                  ),
                ],
              ),
            ),
          ],
        ),
        actions: [
          // TTS开关
          Obx(() => IconButton(
                icon: Icon(
                  controller.isTtsEnabled.value
                      ? Icons.volume_up
                      : Icons.volume_off,
                  color: controller.isTtsEnabled.value
                      ? AppColors.primary
                      : Colors.grey,
                ),
                onPressed: controller.toggleTts,
              )),
          // 更多选项
          PopupMenuButton(
            icon: Icon(Icons.more_vert, color: Colors.black),
            itemBuilder: (context) => [
              PopupMenuItem(
                value: 'clear',
                child: Row(
                  children: [
                    Icon(Icons.delete_outline, color: Colors.red),
                    SizedBox(width: 8.w),
                    Text('清空对话'),
                  ],
                ),
              ),
            ],
            onSelected: (value) {
              if (value == 'clear') {
                controller.clearChat();
              }
            },
          ),
        ],
        elevation: 0,
        backgroundColor: Colors.white,
      ),
      body: Container(
        color: Colors.white, // 确保body背景也是白色
        child: Column(
          children: [
            // 消息列表
            Expanded(
              child: Obx(() => ListView.builder(
                    controller: controller.scrollController,
                    padding: EdgeInsets.symmetric(horizontal: 16.w, vertical: 10.h),
                    itemCount: controller.messages.length,
                    reverse: false,
                    physics: const AlwaysScrollableScrollPhysics(),
                    cacheExtent: 1000, // 增加缓存范围，减少重建
                    itemBuilder: (context, index) {
                      final message = controller.messages[index];
                      return MessageBubble(
                        key: ObjectKey(message), // 使用ObjectKey而不是ValueKey
                        message: message,
                        isUser: message.role == 'user',
                      );
                    },
                  )),
            ),
            
            // 输入区域 - 根据当前模式显示不同的输入面板
            Obx(() => controller.isVoiceRecognitionActive.value
                ? _buildVoiceInputPanel()
                : _buildTextInputPanel()),
          ],
        ),
      ),
    );
  }

  // 构建文本输入面板
  Widget _buildTextInputPanel() {
    // 创建一个TextEditingController来控制输入框
    final TextEditingController textController = TextEditingController(text: controller.inputText.value);
    
    // 监听输入变化
    textController.addListener(() {
      controller.inputText.value = textController.text;
    });
    
    return Container(
      padding: EdgeInsets.symmetric(horizontal: 16.w, vertical: 8.h),
      decoration: BoxDecoration(
        color: Colors.white,
        boxShadow: [
          BoxShadow(
            color: Colors.black.withOpacity(0.05),
            blurRadius: 5,
            offset: Offset(0, -1),
          ),
        ],
      ),
      child: Row(
        children: [
          // 语音输入按钮
          IconButton(
            icon: Icon(
              Icons.mic_none,
              color: Colors.grey,
            ),
            onPressed: controller.startVoiceRecognition,
          ),
          // 文本输入框
          Expanded(
            child: TextField(
              controller: textController,
              decoration: InputDecoration(
                hintText: '发消息...',
                border: OutlineInputBorder(
                  borderRadius: BorderRadius.circular(20.r),
                  borderSide: BorderSide.none,
                ),
                filled: true,
                fillColor: Colors.grey[200],
                contentPadding: EdgeInsets.symmetric(
                  horizontal: 16.w,
                  vertical: 8.h,
                ),
              ),
              maxLines: null,
              textInputAction: TextInputAction.send,
              onSubmitted: (value) {
                if (value.trim().isNotEmpty) {
                  controller.sendMessage(value);
                  textController.clear();
                }
              },
            ),
          ),
          // 发送按钮
          Obx(() => IconButton(
                icon: Icon(
                  Icons.send,
                  color: controller.inputText.value.trim().isEmpty
                      ? Colors.grey
                      : AppColors.primary,
                ),
                onPressed: controller.inputText.value.trim().isEmpty
                    ? null
                    : () {
                        controller.sendMessage(controller.inputText.value);
                        textController.clear();
                      },
              )),
        ],
      ),
    );
  }

  // 构建语音输入面板
  Widget _buildVoiceInputPanel() {
    final screenWidth = Get.width;
    
    return Container(
      width: screenWidth,
      decoration: const BoxDecoration(
        gradient: LinearGradient(
          begin: Alignment.topCenter,
          end: Alignment.bottomCenter,
          colors: [
            Color(0xFFFFFFFF),  // 纯白色开始
            Color(0xFFE8D5F5),  // 更深的紫色结束
          ],
          stops: [0.3, 1.0],    // 调整颜色分布，让白色占据更多空间
        ),
      ),
      child: SafeArea(
        child: SizedBox(
          height: 100.h,
          child: Center(
            child: Padding(
              padding: EdgeInsets.symmetric(horizontal: 20.w),
              child: Row(
                mainAxisAlignment: MainAxisAlignment.spaceBetween,
                crossAxisAlignment: CrossAxisAlignment.center,
                children: [
                  // 左侧麦克风按钮
                  _buildMicrophoneButton(),
                  
                  // 中间音频波形和状态文本
                  Expanded(
                    child: Column(
                      mainAxisSize: MainAxisSize.min,
                      mainAxisAlignment: MainAxisAlignment.center,
                      children: [
                        // 音频波形
                        _buildAudioWaveform(),
                        SizedBox(height: 10.h),
                        // 状态文本
                        Obx(() => Text(
                          controller.isSpeechDetected.value ? '正在聆听...' : '你可以开始说话',
                          style: TextStyle(
                            fontSize: 16.sp,
                            color: Colors.grey.shade700,
                            fontWeight: FontWeight.w500,
                          ),
                        )),
                      ],
                    ),
                  ),
                  
                  // 右侧关闭按钮
                  _buildCloseButton(),
                ],
              ),
            ),
          ),
        ),
      ),
    );
  }
  
  // 麦克风按钮
  Widget _buildMicrophoneButton() {
    return Container(
      width: 60.w,
      height: 60.w,
      decoration: BoxDecoration(
        color: Colors.white,
        shape: BoxShape.circle,
        boxShadow: [
          BoxShadow(
            color: Colors.black.withOpacity(0.05),
            blurRadius: 10,
            spreadRadius: 1,
          ),
        ],
      ),
      child: Center(
        child: Obx(() => IconButton(
          icon: Icon(
            controller.isListening.value ? Icons.mic : Icons.mic_none,
            color: controller.isListening.value ? AppColors.primary : Colors.grey.shade400,
            size: 28.sp,
          ),
          onPressed: controller.stopVoiceRecognition,
          padding: EdgeInsets.zero,
        )),
      ),
    );
  }
  
  // 关闭按钮
  Widget _buildCloseButton() {
    return Container(
      width: 60.w,
      height: 60.w,
      decoration: BoxDecoration(
        color: Colors.white,
        shape: BoxShape.circle,
        boxShadow: [
          BoxShadow(
            color: Colors.black.withOpacity(0.05),
            blurRadius: 10,
            spreadRadius: 1,
          ),
        ],
      ),
      child: Center(
        child: IconButton(
          icon: Icon(
            Icons.close,
            color: Colors.grey.shade600,
            size: 28.sp,
          ),
          onPressed: controller.stopVoiceRecognition,
          padding: EdgeInsets.zero,
        ),
      ),
    );
  }
  
  // 音频波形
  Widget _buildAudioWaveform() {
    return SizedBox(
      width: 220.w,
      height: 50.h,
      child: Obx(() {
        final isSpeaking = controller.isSpeechDetected.value;
        final isRec = controller.isListening.value;
        
        if (!isRec) {
          // 如果没有在录音，显示静态波形
          return _buildStaticWaveform();
        }
        
        // 使用AudioWaveforms组件显示实时波形
        return AudioWaveforms(
          enableGesture: false,
          size: Size(220.w, 50.h),
          recorderController: _recorderController,
          waveStyle: WaveStyle(
            waveColor: isSpeaking 
                ? AppColors.primary 
                : AppColors.primary.withOpacity(0.3),
            extendWaveform: true,
            showMiddleLine: false,
            spacing: 4.0,
            waveThickness: 3.0,
            showDurationLabel: false,
            scaleFactor: 80, // 调整波形高度
          ),
          decoration: BoxDecoration(
            borderRadius: BorderRadius.circular(12.r),
            color: Colors.transparent,
          ),
          padding: EdgeInsets.symmetric(horizontal: 8.w),
          margin: EdgeInsets.only(bottom: 5.h),
        );
      }),
    );
  }
  
  // 静态波形（当没有录音时显示）
  Widget _buildStaticWaveform() {
    final barCount = 23; // 条形数量
    
    return Row(
      mainAxisSize: MainAxisSize.min,
      mainAxisAlignment: MainAxisAlignment.center,
      children: List.generate(
        barCount,
        (index) {
          // 静态高度
          final height = 2.h;
          
          return SizedBox(
            width: 5.5.w,
            child: Center(
              child: Container(
                width: 2.5.w,
                height: height,
                margin: EdgeInsets.symmetric(horizontal: 1.2.w),
                decoration: BoxDecoration(
                  color: Colors.grey.shade400,
                  borderRadius: BorderRadius.circular(2.r),
                ),
              ),
            ),
          );
        },
      ),
    );
  }
}