import 'package:flutter/material.dart';
import 'package:intl/intl.dart';

/// 消息气泡组件
class MessageBubble extends StatelessWidget {
  final bool isUser;
  final String message;
  final DateTime timestamp;
  final bool isRecognizing;

  const MessageBubble({
    Key? key,
    required this.isUser,
    required this.message,
    required this.timestamp,
    this.isRecognizing = false,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    final timeFormat = DateFormat('HH:mm');
    
    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 8),
      child: Row(
        mainAxisAlignment: isUser ? MainAxisAlignment.end : MainAxisAlignment.start,
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          if (!isUser) _buildAvatar(isUser, context),
          const SizedBox(width: 8),
          Flexible(
            child: Column(
              crossAxisAlignment: isUser ? CrossAxisAlignment.end : CrossAxisAlignment.start,
              children: [
                Container(
                  padding: const EdgeInsets.all(12),
                  decoration: BoxDecoration(
                    color: _getBubbleColor(context),
                    borderRadius: BorderRadius.circular(18).copyWith(
                      bottomLeft: isUser ? const Radius.circular(18) : const Radius.circular(4),
                      bottomRight: !isUser ? const Radius.circular(18) : const Radius.circular(4),
                    ),
                    boxShadow: [
                      BoxShadow(
                        color: Colors.black.withOpacity(0.05),
                        blurRadius: 2,
                        offset: const Offset(0, 1),
                      ),
                    ],
                  ),
                  child: _buildMessageContent(context),
                ),
                const SizedBox(height: 4),
                // 识别中的消息不显示时间
                if (!isRecognizing)
                  Text(
                    timeFormat.format(timestamp),
                    style: TextStyle(
                      fontSize: 10,
                      color: Colors.grey[500],
                      fontWeight: FontWeight.w400,
                    ),
                  ),
              ],
            ),
          ),
          const SizedBox(width: 8),
          if (isUser) _buildAvatar(isUser, context),
        ],
      ),
    );
  }

  /// 获取气泡颜色
  Color _getBubbleColor(BuildContext context) {
    if (isUser) {
      return isRecognizing 
          ? Color(0xFF3B82F6).withOpacity(0.8) // 识别中的用户消息使用半透明的蓝色
          : Color(0xFF3B82F6); // 使用更明亮的蓝色
    } else {
      return Color(0xFFF1F5F9); // 更淡的灰色背景
    }
  }

  /// 构建头像
  Widget _buildAvatar(bool isUser, BuildContext context) {
    return Container(
      width: 36,
      height: 36,
      decoration: BoxDecoration(
        color: isUser ? Colors.grey[300] : Theme.of(context).primaryColor,
        borderRadius: BorderRadius.circular(18),
        boxShadow: [
          BoxShadow(
            color: Colors.black.withOpacity(0.05),
            blurRadius: 2,
            offset: const Offset(0, 1),
          ),
        ],
      ),
      child: Icon(
        isUser ? Icons.person : Icons.smart_toy_outlined,
        color: isUser ? Colors.grey[700] : Colors.white,
        size: 20,
      ),
    );
  }

  /// 构建消息内容
  Widget _buildMessageContent(BuildContext context) {
    // 如果是识别中的消息，添加特殊样式
    if (isRecognizing) {
      return Row(
        mainAxisSize: MainAxisSize.min,
        children: [
          Flexible(
            child: Text(
              message,
              style: const TextStyle(
                color: Colors.white,
                fontStyle: FontStyle.italic,
                fontSize: 14,
                height: 1.4,
              ),
              overflow: TextOverflow.ellipsis,
            ),
          ),
          const SizedBox(width: 8),
          _buildTypingIndicator(),
        ],
      );
    }
    
    // 判断消息内容，显示特殊卡片
    if (!isUser) {
      if (message.contains('播放列表') || message.contains('音乐')) {
        return _buildMusicContent(context);
      } else if (message.contains('景点') || message.contains('旅游')) {
        return _buildTravelContent(context);
      } else if (message.contains('天气') || message.contains('气温') || message.contains('预报')) {
        return _buildWeatherContent(context);
      }
    }
    
    return Text(
      message,
      style: TextStyle(
        color: isUser ? Colors.white : Colors.black87,
        fontSize: 14,
        height: 1.4,
        fontWeight: FontWeight.w400,
      ),
    );
  }

  /// 构建输入中的指示器
  Widget _buildTypingIndicator() {
    return SizedBox(
      width: 40,
      height: 20,
      child: Row(
        mainAxisAlignment: MainAxisAlignment.spaceEvenly,
        children: [
          _buildDot(100),
          _buildDot(300),
          _buildDot(500),
        ],
      ),
    );
  }

  /// 构建动画点
  Widget _buildDot(int milliseconds) {
    return _AnimatedDot(delayMilliseconds: milliseconds);
  }

  /// 构建音乐内容卡片
  Widget _buildMusicContent(BuildContext context) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Text(
          '以下是一些推荐的音乐:',
          style: TextStyle(
            color: Colors.black87,
            fontSize: 14,
            height: 1.4,
            fontWeight: FontWeight.w400,
          ),
        ),
        const SizedBox(height: 12),
        Container(
          padding: const EdgeInsets.all(12),
          decoration: BoxDecoration(
            color: Colors.white,
            borderRadius: BorderRadius.circular(12),
            boxShadow: [
              BoxShadow(
                color: Colors.black.withOpacity(0.03),
                blurRadius: 3,
                spreadRadius: 1,
                offset: const Offset(0, 1),
              ),
            ],
          ),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Row(
                children: [
                  Icon(
                    Icons.music_note,
                    size: 16,
                    color: Theme.of(context).primaryColor.withOpacity(0.7),
                  ),
                  const SizedBox(width: 6),
                  Text(
                    '雨天时光 · 播放列表',
                    style: TextStyle(
                      fontSize: 13,
                      fontWeight: FontWeight.w600,
                      color: Colors.grey[700],
                    ),
                  ),
                ],
              ),
              const SizedBox(height: 10),
              
              // 歌曲示例
              _buildMusicItem('雨声与钢琴曲', '纯音乐', context),
              Divider(height: 1, thickness: 1, color: Colors.grey[100]),
              _buildMusicItem('Rainy Day', 'Coldplay', context),
              Divider(height: 1, thickness: 1, color: Colors.grey[100]),
              _buildMusicItem('雨天的爵士咖啡馆', '爵士合集', context),
              
              const SizedBox(height: 8),
              Center(
                child: TextButton(
                  onPressed: () {},
                  style: TextButton.styleFrom(
                    minimumSize: Size.zero,
                    padding: EdgeInsets.symmetric(horizontal: 12, vertical: 8),
                    tapTargetSize: MaterialTapTargetSize.shrinkWrap,
                  ),
                  child: Text(
                    '查看更多推荐',
                    style: TextStyle(
                      fontSize: 12,
                      color: Theme.of(context).primaryColor,
                      fontWeight: FontWeight.w500,
                    ),
                  ),
                ),
              ),
            ],
          ),
        ),
        const SizedBox(height: 10),
        Row(
          mainAxisSize: MainAxisSize.min,
          children: [
            Expanded(
              child: OutlinedButton.icon(
                onPressed: () {},
                icon: Icon(Icons.play_arrow, size: 16),
                label: Text('播放全部'),
                style: OutlinedButton.styleFrom(
                  foregroundColor: Theme.of(context).primaryColor,
                  side: BorderSide(color: Theme.of(context).primaryColor.withOpacity(0.5)),
                  padding: EdgeInsets.symmetric(horizontal: 12, vertical: 4),
                  shape: RoundedRectangleBorder(
                    borderRadius: BorderRadius.circular(16),
                  ),
                  textStyle: TextStyle(fontSize: 12),
                ),
              ),
            ),
            SizedBox(width: 8),
            Expanded(
              child: OutlinedButton.icon(
                onPressed: () {},
                icon: Icon(Icons.shuffle, size: 16),
                label: Text('随机播放'),
                style: OutlinedButton.styleFrom(
                  foregroundColor: Colors.grey[700],
                  side: BorderSide(color: Colors.grey[400]!),
                  padding: EdgeInsets.symmetric(horizontal: 12, vertical: 4),
                  shape: RoundedRectangleBorder(
                    borderRadius: BorderRadius.circular(16),
                  ),
                  textStyle: TextStyle(fontSize: 12),
                ),
              ),
            ),
          ],
        ),
      ],
    );
  }
  
  /// 构建旅游内容卡片
  Widget _buildTravelContent(BuildContext context) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Text(
          '以下是一些推荐的景点:',
          style: TextStyle(
            color: Colors.black87,
            fontSize: 14,
            height: 1.4,
            fontWeight: FontWeight.w400,
          ),
        ),
        const SizedBox(height: 12),
        Container(
          padding: const EdgeInsets.all(12),
          decoration: BoxDecoration(
            color: Colors.white,
            borderRadius: BorderRadius.circular(12),
            boxShadow: [
              BoxShadow(
                color: Colors.black.withOpacity(0.03),
                blurRadius: 3,
                spreadRadius: 1,
                offset: const Offset(0, 1),
              ),
            ],
          ),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Row(
                children: [
                  Icon(
                    Icons.place,
                    size: 16,
                    color: Color(0xFFE11D48),
                  ),
                  const SizedBox(width: 6),
                  Text(
                    '热门景点 · 东京',
                    style: TextStyle(
                      fontSize: 13,
                      fontWeight: FontWeight.w600,
                      color: Colors.grey[700],
                    ),
                  ),
                ],
              ),
              const SizedBox(height: 10),
              
              // 景点列表
              _buildLocationItem('东京塔', '标志性建筑，可俯瞰东京全景', context),
              Divider(height: 1, thickness: 1, color: Colors.grey[100]),
              _buildLocationItem('涩谷十字路口', '世界上最繁忙的十字路口之一', context),
              Divider(height: 1, thickness: 1, color: Colors.grey[100]),
              _buildLocationItem('浅草寺', '东京最古老的寺庙', context),
              
              const SizedBox(height: 8),
              Center(
                child: TextButton(
                  onPressed: () {},
                  style: TextButton.styleFrom(
                    minimumSize: Size.zero,
                    padding: EdgeInsets.symmetric(horizontal: 12, vertical: 8),
                    tapTargetSize: MaterialTapTargetSize.shrinkWrap,
                  ),
                  child: Text(
                    '查看更多景点',
                    style: TextStyle(
                      fontSize: 12,
                      color: Theme.of(context).primaryColor,
                      fontWeight: FontWeight.w500,
                    ),
                  ),
                ),
              ),
            ],
          ),
        ),
        const SizedBox(height: 10),
        Row(
          mainAxisSize: MainAxisSize.min,
          children: [
            Expanded(
              child: OutlinedButton.icon(
                onPressed: () {},
                icon: Icon(Icons.map, size: 16),
                label: Text('查看地图'),
                style: OutlinedButton.styleFrom(
                  foregroundColor: Theme.of(context).primaryColor,
                  side: BorderSide(color: Theme.of(context).primaryColor.withOpacity(0.5)),
                  padding: EdgeInsets.symmetric(horizontal: 12, vertical: 4),
                  shape: RoundedRectangleBorder(
                    borderRadius: BorderRadius.circular(16),
                  ),
                  textStyle: TextStyle(fontSize: 12),
                ),
              ),
            ),
            SizedBox(width: 8),
            Expanded(
              child: OutlinedButton.icon(
                onPressed: () {},
                icon: Icon(Icons.bookmark_border, size: 16),
                label: Text('保存到收藏'),
                style: OutlinedButton.styleFrom(
                  foregroundColor: Colors.grey[700],
                  side: BorderSide(color: Colors.grey[400]!),
                  padding: EdgeInsets.symmetric(horizontal: 12, vertical: 4),
                  shape: RoundedRectangleBorder(
                    borderRadius: BorderRadius.circular(16),
                  ),
                  textStyle: TextStyle(fontSize: 12),
                ),
              ),
            ),
          ],
        ),
      ],
    );
  }

  /// 构建音乐项目
  Widget _buildMusicItem(String title, String artist, BuildContext context) {
    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 8),
      child: Row(
        children: [
          Container(
            width: 38,
            height: 38,
            decoration: BoxDecoration(
              color: Colors.grey[100],
              borderRadius: BorderRadius.circular(8),
            ),
            child: Icon(
              Icons.music_note,
              size: 18,
              color: Theme.of(context).primaryColor,
            ),
          ),
          const SizedBox(width: 12),
          Expanded(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Text(
                  title,
                  style: TextStyle(
                    fontSize: 13,
                    fontWeight: FontWeight.w500,
                    color: Colors.grey[800],
                  ),
                  overflow: TextOverflow.ellipsis,
                ),
                SizedBox(height: 2),
                Text(
                  artist,
                  style: TextStyle(
                    fontSize: 12,
                    color: Colors.grey[600],
                  ),
                  overflow: TextOverflow.ellipsis,
                ),
              ],
            ),
          ),
          IconButton(
            onPressed: () {},
            icon: Icon(Icons.play_circle, color: Theme.of(context).primaryColor),
            padding: EdgeInsets.zero,
            constraints: BoxConstraints(),
            iconSize: 24,
          ),
        ],
      ),
    );
  }
  
  /// 构建地点项目
  Widget _buildLocationItem(String name, String description, BuildContext context) {
    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 8),
      child: Row(
        children: [
          Container(
            width: 38,
            height: 38,
            decoration: BoxDecoration(
              color: Colors.blue[50],
              borderRadius: BorderRadius.circular(8),
            ),
            child: Icon(
              Icons.place,
              size: 18,
              color: Color(0xFFE11D48),
            ),
          ),
          const SizedBox(width: 12),
          Expanded(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Text(
                  name,
                  style: TextStyle(
                    fontSize: 13,
                    fontWeight: FontWeight.w500,
                    color: Colors.grey[800],
                  ),
                  overflow: TextOverflow.ellipsis,
                ),
                SizedBox(height: 2),
                Text(
                  description,
                  style: TextStyle(
                    fontSize: 12,
                    color: Colors.grey[600],
                  ),
                  overflow: TextOverflow.ellipsis,
                ),
              ],
            ),
          ),
          IconButton(
            onPressed: () {},
            icon: Icon(Icons.arrow_forward, color: Colors.grey[400]),
            padding: EdgeInsets.zero,
            constraints: BoxConstraints(),
            iconSize: 20,
          ),
        ],
      ),
    );
  }

  /// 构建天气内容卡片
  Widget _buildWeatherContent(BuildContext context) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Text(
          '当前天气情况:',
          style: TextStyle(
            color: Colors.black87,
            fontSize: 14,
            height: 1.4,
            fontWeight: FontWeight.w400,
          ),
        ),
        const SizedBox(height: 12),
        Container(
          padding: const EdgeInsets.all(16),
          decoration: BoxDecoration(
            gradient: LinearGradient(
              begin: Alignment.topLeft,
              end: Alignment.bottomRight,
              colors: [Color(0xFF60A5FA), Color(0xFF3B82F6)],
            ),
            borderRadius: BorderRadius.circular(12),
            boxShadow: [
              BoxShadow(
                color: Colors.black.withOpacity(0.1),
                blurRadius: 8,
                offset: const Offset(0, 2),
              ),
            ],
          ),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Row(
                mainAxisAlignment: MainAxisAlignment.spaceBetween,
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      Text(
                        '北京',
                        style: TextStyle(
                          fontSize: 16,
                          fontWeight: FontWeight.w600,
                          color: Colors.white,
                        ),
                      ),
                      SizedBox(height: 4),
                      Text(
                        '晴朗',
                        style: TextStyle(
                          fontSize: 14,
                          color: Colors.white.withOpacity(0.9),
                        ),
                      ),
                      SizedBox(height: 12),
                      Row(
                        children: [
                          Text(
                            '25°',
                            style: TextStyle(
                              fontSize: 36,
                              fontWeight: FontWeight.bold,
                              color: Colors.white,
                            ),
                          ),
                          SizedBox(width: 8),
                          Column(
                            crossAxisAlignment: CrossAxisAlignment.start,
                            children: [
                              Text(
                                '最高: 29°',
                                style: TextStyle(
                                  fontSize: 12,
                                  color: Colors.white.withOpacity(0.9),
                                ),
                              ),
                              Text(
                                '最低: 18°',
                                style: TextStyle(
                                  fontSize: 12,
                                  color: Colors.white.withOpacity(0.9),
                                ),
                              ),
                            ],
                          ),
                        ],
                      ),
                    ],
                  ),
                  Icon(
                    Icons.wb_sunny,
                    size: 48,
                    color: Colors.white,
                  ),
                ],
              ),
              SizedBox(height: 16),
              Container(
                height: 1,
                color: Colors.white.withOpacity(0.2),
              ),
              SizedBox(height: 16),
              Text(
                '未来预报',
                style: TextStyle(
                  fontSize: 14,
                  fontWeight: FontWeight.w600,
                  color: Colors.white,
                ),
              ),
              SizedBox(height: 8),
              Row(
                mainAxisAlignment: MainAxisAlignment.spaceBetween,
                children: [
                  _buildForecastDay('周一', Icons.wb_sunny, '28°'),
                  _buildForecastDay('周二', Icons.cloud, '25°'),
                  _buildForecastDay('周三', Icons.wb_cloudy, '26°'),
                  _buildForecastDay('周四', Icons.grain, '24°'),
                  _buildForecastDay('周五', Icons.wb_sunny, '27°'),
                ],
              ),
              SizedBox(height: 16),
              Container(
                padding: EdgeInsets.symmetric(vertical: 8, horizontal: 12),
                decoration: BoxDecoration(
                  color: Colors.white.withOpacity(0.2),
                  borderRadius: BorderRadius.circular(8),
                ),
                child: Row(
                  children: [
                    Icon(
                      Icons.info_outline,
                      size: 16,
                      color: Colors.white,
                    ),
                    SizedBox(width: 6),
                    Flexible(
                      child: Text(
                        '今日紫外线指数较高，外出请做好防晒',
                        style: TextStyle(
                          fontSize: 12,
                          color: Colors.white,
                        ),
                      ),
                    ),
                  ],
                ),
              ),
            ],
          ),
        ),
        const SizedBox(height: 10),
        Row(
          mainAxisSize: MainAxisSize.min,
          children: [
            Expanded(
              child: OutlinedButton.icon(
                onPressed: () {},
                icon: Icon(Icons.location_on, size: 16),
                label: Text('更多地区'),
                style: OutlinedButton.styleFrom(
                  foregroundColor: Theme.of(context).primaryColor,
                  side: BorderSide(color: Theme.of(context).primaryColor.withOpacity(0.5)),
                  padding: EdgeInsets.symmetric(horizontal: 12, vertical: 4),
                  shape: RoundedRectangleBorder(
                    borderRadius: BorderRadius.circular(16),
                  ),
                  textStyle: TextStyle(fontSize: 12),
                ),
              ),
            ),
            SizedBox(width: 8),
            Expanded(
              child: OutlinedButton.icon(
                onPressed: () {},
                icon: Icon(Icons.calendar_today, size: 16),
                label: Text('15天预报'),
                style: OutlinedButton.styleFrom(
                  foregroundColor: Colors.grey[700],
                  side: BorderSide(color: Colors.grey[400]!),
                  padding: EdgeInsets.symmetric(horizontal: 12, vertical: 4),
                  shape: RoundedRectangleBorder(
                    borderRadius: BorderRadius.circular(16),
                  ),
                  textStyle: TextStyle(fontSize: 12),
                ),
              ),
            ),
          ],
        ),
      ],
    );
  }
  
  /// 构建单日天气预报
  Widget _buildForecastDay(String day, IconData icon, String temp) {
    return Column(
      children: [
        Text(
          day,
          style: TextStyle(
            fontSize: 12,
            color: Colors.white.withOpacity(0.9),
          ),
        ),
        SizedBox(height: 4),
        Icon(
          icon,
          size: 20,
          color: Colors.white,
        ),
        SizedBox(height: 4),
        Text(
          temp,
          style: TextStyle(
            fontSize: 12,
            fontWeight: FontWeight.w500,
            color: Colors.white,
          ),
        ),
      ],
    );
  }
}

/// 动画点组件
class _AnimatedDot extends StatefulWidget {
  final int delayMilliseconds;
  
  const _AnimatedDot({required this.delayMilliseconds});
  
  @override
  _AnimatedDotState createState() => _AnimatedDotState();
}

class _AnimatedDotState extends State<_AnimatedDot> with SingleTickerProviderStateMixin {
  late AnimationController _controller;
  late Animation<double> _animation;
  
  @override
  void initState() {
    super.initState();
    
    _controller = AnimationController(
      vsync: this,
      duration: const Duration(milliseconds: 1500),
    );
    
    _animation = Tween<double>(begin: 0, end: 6).animate(
      CurvedAnimation(
        parent: _controller,
        curve: Interval(0.0, 0.5, curve: Curves.easeOut),
        reverseCurve: Interval(0.5, 1.0, curve: Curves.easeIn),
      ),
    )..addListener(() {
      setState(() {});
    });
    
    Future.delayed(Duration(milliseconds: widget.delayMilliseconds), () {
      if (mounted) {
        _controller.repeat();
      }
    });
  }
  
  @override
  void dispose() {
    _controller.dispose();
    super.dispose();
  }
  
  @override
  Widget build(BuildContext context) {
    return Container(
      width: 6,
      height: 6,
      decoration: BoxDecoration(
        color: Colors.white,
        borderRadius: BorderRadius.circular(3),
        boxShadow: [
          BoxShadow(
            color: Colors.white.withOpacity(0.5),
            blurRadius: _animation.value,
            spreadRadius: _animation.value / 2,
          ),
        ],
      ),
    );
  }
}