import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'dart:math';
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 GetView<ChatController> {
  ChatView({Key? key}) : super(key: key);

  // 添加ScrollController用于控制滚动
  final ScrollController _scrollController = ScrollController();

  @override
  Widget build(BuildContext context) {
    // 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,
          );
        }
      });
    });

    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.recognizedText.isEmpty ? '你可以开始说话' : '正在聆听...',
                          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() {
    final barCount = 23; // 条形数量
    
    return SizedBox(
      width: 220.w,
      height: 50.h,
      child: Obx(() {
        final isSpeaking = controller.recognizedText.isNotEmpty;
        final isRec = controller.isListening.value;
        
        return Row(
          mainAxisSize: MainAxisSize.min,
          mainAxisAlignment: MainAxisAlignment.center,
          children: List.generate(
            barCount,
            (index) {
              // 创建动态高度效果
              double height = isRec
                  ? _getWaveHeight(index, isSpeaking, barCount).clamp(1.h, 22.5.h) 
                  : 2.h;
                  
              // 动画持续时间
              final duration = Duration(
                milliseconds: isSpeaking ? 60 + (index % 4) * 20 : 150 + (index % 3) * 50
              );
              
              // 颜色计算
              Color barColor;
              if (isRec) {
                if (isSpeaking) {
                  final middleIndex = barCount ~/ 2;
                  final distance = (index - middleIndex).abs();
                  final maxDistance = middleIndex;
                  final colorIntensity = 1.0 - (distance / maxDistance) * 0.2; 
                  
                  barColor = index % 3 == 0 
                      ? AppColors.primary 
                      : AppColors.primary.withOpacity(colorIntensity);
                } else {
                  barColor = AppColors.primary.withOpacity(0.3);
                }
              } else {
                barColor = Colors.grey.shade400;
              }
              
              return SizedBox(
                width: 5.5.w,
                child: Center(
                  child: AnimatedContainer(
                    duration: duration,
                    curve: isSpeaking ? Curves.elasticOut : Curves.easeInOut,
                    width: isSpeaking ? 2.8.w : 2.5.w,
                    height: height,
                    margin: EdgeInsets.symmetric(horizontal: 1.2.w),
                    decoration: BoxDecoration(
                      color: barColor,
                      borderRadius: BorderRadius.circular(2.r),
                      boxShadow: isSpeaking ? [
                        BoxShadow(
                          color: AppColors.primary.withOpacity(0.4),
                          blurRadius: 5,
                          spreadRadius: 1.2,
                        )
                      ] : null,
                    ),
                  ),
                ),
              );
            },
          ),
        );
      }),
    );
  }
  
  // 生成动态波形高度
  double _getWaveHeight(int index, bool isSpeaking, int barCount) {
    try {
      // 基础高度
      double baseHeight = isSpeaking ? 5.h : 3.h;
      
      // 获取当前时间毫秒数
      final DateTime now = DateTime.now();
      final int milliseconds = now.millisecondsSinceEpoch;
      
      // 计算中心位置
      final middleIndex = barCount ~/ 2;
      final distanceFromMiddle = (index - middleIndex).abs();
      
      // 使用多个正弦波叠加
      double freqMultiplier = isSpeaking ? 2.2 : 1.0;
      double ampMultiplier = isSpeaking ? 1.8 : 1.0;
      
      double wave1 = sin((milliseconds / 150) * freqMultiplier + (index * 0.8)) * 2.h * ampMultiplier;
      double wave2 = sin((milliseconds / 280) * freqMultiplier + (index * 0.5)) * 1.5.h * ampMultiplier;
      double wave3 = sin((milliseconds / 340) * freqMultiplier + (index * 0.3)) * 1.25.h * ampMultiplier;
      double wave4 = cos((milliseconds / 220) * freqMultiplier + (index * 0.7)) * 1.h * ampMultiplier;
      
      // 基于距离中心的位置计算高度衰减
      double positionFactor = isSpeaking 
          ? 1.0 - (distanceFromMiddle / middleIndex) * 0.2
          : 1.0 - (distanceFromMiddle / middleIndex) * 0.5;
      
      if (isSpeaking) {
        // 用户说话时的波形
        double timeFactor = 0.9 + sin(milliseconds / 600) * 0.5;
        
        // 增强中心突出效果
        double centerBoost = pow(positionFactor, 1.2) * 10.h;
        
        // 增加随机性
        double randomFactor = (Random().nextDouble() * 4 - 2) * 1.75.h;
        
        // 增强脉冲效果
        double pulseEffect = sin(milliseconds / 300) * 2.5.h * positionFactor;
        
        // 添加额外的随机波动
        double voiceVariation = sin(milliseconds / 80 + index * 1.2) * 1.5.h * Random().nextDouble();
        
        // 添加爆发效果
        double burstEffect = 0;
        if (Random().nextDouble() > 0.97) {
          burstEffect = 5.h * positionFactor;
        }
        
        return baseHeight + (wave1 + wave2 + wave3 + wave4) * timeFactor + 
               centerBoost + randomFactor + pulseEffect + voiceVariation + burstEffect;
      } else {
        // 用户不说话时的波形
        double idleWave = (wave1 + wave2) * 0.35 * positionFactor;
        double gentlePulse = sin(milliseconds / 800) * 1.h * positionFactor;
        return baseHeight + idleWave + gentlePulse;
      }
    } catch (e) {
      // 发生错误时返回默认高度
      return 2.h;
    }
  }
}