import 'dart:io';
import 'package:flutter/material.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'package:im_flutter_sdk/im_flutter_sdk.dart';
import 'package:get/get.dart';
import 'package:flutter_smart_dialog/flutter_smart_dialog.dart';
import 'package:cached_network_image/cached_network_image.dart';
import 'package:video_player/video_player.dart';
import 'package:dating_touchme_app/pages/message/video_player_page.dart';
import 'package:dating_touchme_app/generated/assets.dart';

class VideoItem extends StatefulWidget {
  final EMVideoMessageBody videoBody;
  final bool isSentByMe;
  final bool showTime;
  final String formattedTime;
  final EMMessage message; // 添加消息对象以获取状态
  final VoidCallback? onResend; // 添加重发回调

  const VideoItem({
    required this.videoBody,
    required this.isSentByMe,
    required this.showTime,
    required this.formattedTime,
    required this.message,
    this.onResend,
    super.key,
  });

  @override
  State<VideoItem> createState() => _VideoItemState();
}

// 消息发送状态枚举
enum MessageSendStatus {
  sending,
  success,
  failed,
}

class _VideoItemState extends State<VideoItem> {
  String? _thumbnailPath;
  bool _isLoadingVideo = false;

  @override
  void initState() {
    super.initState();
    // 🚀 极致性能优化：只准备缩略图路径，完全不初始化视频控制器
    _prepareThumbnail();
  }

  /// 准备缩略图路径（轻量级操作）
  void _prepareThumbnail() {
    final thumbLocal = widget.videoBody.thumbnailLocalPath;
    final thumbRemote = widget.videoBody.thumbnailRemotePath;
    
    print('🖼️ [VideoItem] 缩略图调试信息:');
    print('本地缩略图路径: $thumbLocal');
    print('远程缩略图路径: $thumbRemote');
    
    // 优先使用本地缩略图
    if (thumbLocal != null && thumbLocal.isNotEmpty) {
      final file = File(thumbLocal);
      if (file.existsSync()) {
        _thumbnailPath = thumbLocal;
        print('✅ 使用本地缩略图: $thumbLocal');
        return;
      } else {
        print('⚠️ 本地缩略图文件不存在: $thumbLocal');
      }
    }
    
    // 使用远程缩略图
    if (thumbRemote != null && thumbRemote.isNotEmpty) {
      _thumbnailPath = thumbRemote;
      print('✅ 使用远程缩略图: $thumbRemote');
      return;
    }
    
    // 🎯 备选方案：如果没有缩略图，尝试使用视频第一帧
    final videoLocal = widget.videoBody.localPath;
    final videoRemote = widget.videoBody.remotePath;
    
    print('⚠️ 没有缩略图，尝试使用视频路径作为预览');
    print('本地视频路径: $videoLocal');
    print('远程视频路径: $videoRemote');
    
    // 如果有本地视频，使用视频文件生成预览
    if (videoLocal.isNotEmpty && File(videoLocal).existsSync()) {
      print('💡 [VideoItem] 将使用视频第一帧作为预览');
      _generateThumbnailFromVideo(videoLocal);
    } else {
      print('❌ 没有可用的缩略图和视频，将显示占位符图标');
    }
  }
  
  /// 🎯 从视频生成缩略图（备选方案）
  void _generateThumbnailFromVideo(String videoPath) async {
    try {
      print('🎬 [VideoItem] 开始从视频生成缩略图...');
      
      // 使用 video_player 获取第一帧
      final controller = VideoPlayerController.file(File(videoPath));
      await controller.initialize();
      
      // 设置缩略图路径为视频路径（让 UI 知道要使用视频预览）
      if (mounted) {
        setState(() {
          _thumbnailPath = 'video:$videoPath'; // 特殊标记
        });
        print('✅ [VideoItem] 使用视频第一帧作为预览');
      }
      
      // 释放控制器
      controller.dispose();
    } catch (e) {
      print('❌ [VideoItem] 生成视频预览失败: $e');
    }
  }

  @override
  void dispose() {
    // 无需释放资源，因为没有初始化任何控制器
    super.dispose();
  }

  // 构建时间标签
  Widget _buildTimeLabel() {
    return Container(
      alignment: Alignment.center,
      padding: EdgeInsets.symmetric(horizontal: 16.w, vertical: 8.h),
      child: Container(
        padding: EdgeInsets.symmetric(horizontal: 12.w, vertical: 4.h),
        child: Text(
          widget.formattedTime,
          style: TextStyle(fontSize: 12.sp, color: Colors.grey),
        ),
      ),
    );
  }

  // 格式化时长
  String _formatDuration(int seconds) {
    final minutes = seconds ~/ 60;
    final secs = seconds % 60;
    return '${minutes.toString().padLeft(2, '0')}:${secs.toString().padLeft(2, '0')}';
  }

  // 播放视频
  void _playVideo() async {
    // 如果正在加载，不处理点击
    if (_isLoadingVideo) {
      return;
    }
    
    // 获取视频路径
    final localPath = widget.videoBody.localPath;
    final remotePath = widget.videoBody.remotePath;
    
    String? videoPath;
    bool isNetwork = false;
    
    // 优先使用本地路径
    if (localPath.isNotEmpty && File(localPath).existsSync()) {
      videoPath = localPath;
      isNetwork = false;
    } else if (remotePath != null && remotePath.isNotEmpty) {
      videoPath = remotePath;
      isNetwork = true;
    }
    
    if (videoPath != null) {
      // 显示加载状态（如果是网络视频）
      if (isNetwork) {
        setState(() {
          _isLoadingVideo = true;
        });
        
        // 模拟加载延迟（可选）
        await Future.delayed(Duration(milliseconds: 300));
      }
      
      // 使用 Chewie 播放器页面
      await Get.to(
        () => VideoPlayerPage(
          videoPath: videoPath!,
          isNetwork: isNetwork,
        ),
        transition: Transition.fade,
        duration: const Duration(milliseconds: 200),
      );
      
      // 隐藏加载状态
      if (mounted && isNetwork) {
        setState(() {
          _isLoadingVideo = false;
        });
      }
    } else {
      SmartDialog.showToast('⚠️ 视频路径不可用，请稍后重试');
    }
  }

  @override
  Widget build(BuildContext context) {
    return Column(
      children: [
        if (widget.showTime) _buildTimeLabel(),
        Container(
          padding: EdgeInsets.symmetric(horizontal: 16.w, vertical: 8.h),
          child: Builder(
            builder: (context) {
              // 计算视频尺寸
              double maxWidth = 180.w;
              double width = maxWidth;
              double height = width * (304 / 289); // 按289:304比例计算高度
              final videoHeight = height + 10.h; // 加上 margin top (10.h)
              
              return Row(
                mainAxisAlignment: widget.isSentByMe
                    ? MainAxisAlignment.end
                    : MainAxisAlignment.start,
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  if (!widget.isSentByMe) _buildAvatar(),
                  if (!widget.isSentByMe) SizedBox(width: 8.w),
                  // 发送消息时，状态在左侧，与视频垂直居中对齐
                  if (widget.isSentByMe)
                    SizedBox(
                      height: videoHeight,
                      child: Center(
                        child: _buildMessageStatus(),
                      ),
                    ),
                  if (widget.isSentByMe) SizedBox(width: 10.w),
                  // 🚀 极致性能优化：无需初始化，直接显示缩略图
                  Stack(
                    children: [
                      GestureDetector(
                        onTap: _playVideo,
                        child: Container(
                          margin: EdgeInsets.only(top: 10.h),
                          width: 180.w,
                          height: 180.w * (304 / 289), // 按289:304比例计算高度
                      decoration: BoxDecoration(
                        color: Colors.grey[300],
                        borderRadius: BorderRadius.circular(18.w),
                        boxShadow: [
                          BoxShadow(
                            color: Colors.black.withOpacity(0.1),
                            blurRadius: 8,
                            offset: Offset(0, 2),
                          ),
                        ],
                      ),
                      child: ClipRRect(
                        borderRadius: BorderRadius.circular(18.w),
                        child: Stack(
                          fit: StackFit.expand,
                          children: [
                            // 🚀 背景层：默认占位符
                            Container(
                              decoration: BoxDecoration(
                                gradient: LinearGradient(
                                  begin: Alignment.topLeft,
                                  end: Alignment.bottomRight,
                                  colors: [
                                    Colors.grey[300]!,
                                    Colors.grey[400]!,
                                  ],
                                ),
                              ),
                              child: Icon(
                                Icons.videocam,
                                size: 48.w,
                                color: Colors.grey[600],
                              ),
                            ),
                            // 🚀 缩略图层：始终显示缩略图（如果有）
                            if (_thumbnailPath != null && _thumbnailPath!.isNotEmpty)
                              _buildThumbnail(),
                            // 播放按钮和时长覆盖层
                            Container(
                              decoration: BoxDecoration(
                                gradient: LinearGradient(
                                  begin: Alignment.topCenter,
                                  end: Alignment.bottomCenter,
                                  colors: [
                                    Colors.black.withOpacity(0.1),
                                    Colors.black.withOpacity(0.5),
                                  ],
                                ),
                              ),
                              child: Column(
                                mainAxisAlignment: MainAxisAlignment.center,
                                children: [
                                  // 播放按钮（增强动画效果）
                                  Container(
                                    padding: EdgeInsets.all(8.w),
                                    decoration: BoxDecoration(
                                      color: Colors.white.withOpacity(0.2),
                                      shape: BoxShape.circle,
                                    ),
                                    child: Icon(
                                      Icons.play_arrow_rounded,
                                      size: 48.w,
                                      color: Colors.white,
                                    ),
                                  ),
                                ],
                              ),
                            ),
                            // 右下角显示时长标签
                            Positioned(
                              right: 8.w,
                              bottom: 8.h,
                              child: Container(
                                padding: EdgeInsets.symmetric(
                                  horizontal: 8.w,
                                  vertical: 4.h,
                                ),
                                decoration: BoxDecoration(
                                  color: Colors.black.withOpacity(0.7),
                                  borderRadius: BorderRadius.circular(4.w),
                                ),
                                child: Row(
                                  mainAxisSize: MainAxisSize.min,
                                  children: [
                                    Icon(
                                      Icons.videocam_rounded,
                                      size: 12.w,
                                      color: Colors.white,
                                    ),
                                    SizedBox(width: 4.w),
                                    Text(
                                      _formatDuration(widget.videoBody.duration ?? 0),
                                      style: TextStyle(
                                        fontSize: 11.sp,
                                        color: Colors.white,
                                        fontWeight: FontWeight.w600,
                                      ),
                                    ),
                                  ],
                                ),
                              ),
                            ),
                          ],
                        ),
                      ),
                    ),
                  ),
                  // 🚀 加载指示器（播放时显示）
                  if (_isLoadingVideo)
                    Positioned.fill(
                      child: Container(
                        decoration: BoxDecoration(
                          color: Colors.black.withOpacity(0.5),
                          borderRadius: BorderRadius.circular(18.w),
                        ),
                        child: Center(
                          child: CircularProgressIndicator(
                            strokeWidth: 3,
                            valueColor: AlwaysStoppedAnimation<Color>(
                              Colors.white,
                            ),
                          ),
                        ),
                      ),
                    ),
                ],
              ),
                  if (widget.isSentByMe) SizedBox(width: 8.w),
                  if (widget.isSentByMe) _buildAvatar(),
                ],
              );
            },
          ),
        ),
      ],
    );
  }

  // 构建头像
  Widget _buildAvatar() {
    return Container(
      width: 40.w,
      height: 40.w,
      decoration: BoxDecoration(
        borderRadius: BorderRadius.circular(20.w),
        image: DecorationImage(
          image: AssetImage(Assets.imagesAvatarsExample),
          fit: BoxFit.cover,
        ),
      ),
    );
  }

  // 构建消息状态（发送中、已发送、失败重发）
  Widget _buildMessageStatus() {
    // 只对发送的消息显示状态
    if (!widget.isSentByMe) {
      return SizedBox.shrink();
    }

    // 检查消息状态
    final status = widget.message.status;
    
    if (status == MessageStatus.FAIL) {
      // 发送失败，显示重发按钮
      return GestureDetector(
        onTap: widget.onResend,
        child: Container(
          width: 20.w,
          height: 20.w,
          decoration: BoxDecoration(
            color: Colors.red.withOpacity(0.1),
            shape: BoxShape.circle,
          ),
          child: Icon(
            Icons.refresh,
            size: 14.w,
            color: Colors.red,
          ),
        ),
      );
    } else if (status == MessageStatus.PROGRESS) {
      // 发送中，显示加载动画
      return Container(
        width: 16.w,
        height: 16.w,
        child: CircularProgressIndicator(
          strokeWidth: 2,
          valueColor: AlwaysStoppedAnimation<Color>(
            Colors.grey,
          ),
        ),
      );
    } else {
      // 发送成功，不显示任何状态
      return SizedBox.shrink();
    }
  }

  // 🚀 性能优化：构建缓存的缩略图
  Widget _buildThumbnail() {
    if (_thumbnailPath == null || _thumbnailPath!.isEmpty) {
      print('⚠️ [VideoItem] 缩略图路径为空，不渲染');
      return const SizedBox.shrink();
    }

    print('🎨 [VideoItem] 开始渲染缩略图: $_thumbnailPath');

    // 🎯 检查是否是视频预览模式
    if (_thumbnailPath!.startsWith('video:')) {
      print('🎬 [VideoItem] 使用视频第一帧预览模式');
      final videoPath = _thumbnailPath!.substring(6); // 移除 "video:" 前缀
      return _buildVideoPreview(videoPath);
    }

    // 判断是本地路径还是远程路径
    if (_thumbnailPath!.startsWith('http')) {
      print('🌐 [VideoItem] 渲染网络缩略图');
      // 🚀 使用 CachedNetworkImage 缓存网络图片
      return CachedNetworkImage(
        imageUrl: _thumbnailPath!,
        fit: BoxFit.contain,
        width: double.infinity,
        height: double.infinity,
        placeholder: (context, url) {
          print('⏳ [VideoItem] 网络缩略图加载中...');
          return Container(
            color: Colors.grey[300],
            child: Center(
              child: SizedBox(
                width: 24.w,
                height: 24.w,
                child: CircularProgressIndicator(
                  strokeWidth: 2,
                  color: Colors.grey[600],
                ),
              ),
            ),
          );
        },
        errorWidget: (context, url, error) {
          print('❌ [VideoItem] 网络缩略图加载失败: $error');
          return const SizedBox.shrink();
        },
        // 🚀 内存缓存配置
        memCacheWidth: 400, // 限制缓存图片宽度
        memCacheHeight: 300, // 限制缓存图片高度
      );
    } else {
      print('📁 [VideoItem] 渲染本地缩略图');
      // 本地文件
      final file = File(_thumbnailPath!);
      if (file.existsSync()) {
        print('✅ [VideoItem] 本地缩略图文件存在，开始渲染');
        return Image.file(
          file,
          fit: BoxFit.contain,
          width: double.infinity,
          height: double.infinity,
          // 🚀 设置缓存宽高，减少内存占用
          cacheWidth: 400,
          cacheHeight: 300,
          errorBuilder: (context, error, stackTrace) {
            print('❌ [VideoItem] 本地缩略图渲染失败: $error');
            return const SizedBox.shrink();
          },
        );
      } else {
        print('❌ [VideoItem] 本地缩略图文件不存在: $_thumbnailPath');
        return const SizedBox.shrink();
      }
    }
  }

  // 🎯 构建视频第一帧预览（备选方案）
  Widget _buildVideoPreview(String videoPath) {
    return FutureBuilder<VideoPlayerController>(
      future: _initVideoPreview(videoPath),
      builder: (context, snapshot) {
        if (snapshot.connectionState == ConnectionState.done && 
            snapshot.hasData && 
            snapshot.data!.value.isInitialized) {
          print('✅ [VideoItem] 视频预览加载成功');
          // 🎯 使用 FittedBox 保持视频比例，避免变形
          return FittedBox(
            fit: BoxFit.contain,
            child: SizedBox(
              width: snapshot.data!.value.size.width,
              height: snapshot.data!.value.size.height,
              child: VideoPlayer(snapshot.data!),
            ),
          );
        } else {
          print('⏳ [VideoItem] 视频预览加载中...');
          return Container(
            color: Colors.grey[300],
            child: Center(
              child: SizedBox(
                width: 24.w,
                height: 24.w,
                child: CircularProgressIndicator(
                  strokeWidth: 2,
                  color: Colors.grey[600],
                ),
              ),
            ),
          );
        }
      },
    );
  }

  // 初始化视频预览
  Future<VideoPlayerController> _initVideoPreview(String videoPath) async {
    final controller = VideoPlayerController.file(File(videoPath));
    await controller.initialize();
    await controller.seekTo(Duration.zero); // 定位到第一帧
    return controller;
  }
}