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

class ImageItem extends StatefulWidget {
  final EMImageMessageBody imageBody;
  final bool isSentByMe;
  final bool showTime;
  final String formattedTime;
  final EMMessage message;
  final VoidCallback? onResend;

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

  @override
  State<ImageItem> createState() => _ImageItemState();
}

class _ImageItemState extends State<ImageItem> {
  bool _isDownloading = false;
  bool _hasError = false;
  String? _currentLocalPath;
  String? _currentRemotePath;
  bool _shouldHideProgressStatus = false; // 用于判断是否应该隐藏PROGRESS状态

  @override
  void initState() {
    super.initState();
    _initImagePaths();
    _checkAndDownloadImage();
    
    // 对于发送方，添加智能检测：检查远程路径是否可用
    if (widget.isSentByMe) {
      // 立即检查是否有远程路径（说明已经上传成功）
      _checkRemotePathAndUpdateStatus();
      
      // 延迟检查，等待消息状态更新
      Future.delayed(Duration(milliseconds: 500), () {
        if (mounted) {
          _initImagePaths();
          _checkRemotePathAndUpdateStatus();
          setState(() {});
        }
      });
      
      // 如果1秒后状态还是PROGRESS，但有远程路径，认为发送成功，隐藏loading状态
      Future.delayed(Duration(seconds: 1), () {
        if (mounted) {
          _checkRemotePathAndUpdateStatus();
        }
      });
      
      // 如果2秒后状态还是PROGRESS，但有远程路径，认为发送成功，隐藏loading状态
      Future.delayed(Duration(seconds: 2), () {
        if (mounted) {
          _checkRemotePathAndUpdateStatus();
        }
      });
    }
  }

  // 检查远程路径并更新状态
  void _checkRemotePathAndUpdateStatus() {
    // 重新获取路径（可能SDK已经更新）
    final body = widget.message.body;
    if (body is EMImageMessageBody) {
      final remotePath = body.remotePath;
      // 如果有远程路径，说明图片已经上传成功，即使状态还是PROGRESS也隐藏loading
      if (remotePath != null && remotePath.isNotEmpty) {
        if (!_shouldHideProgressStatus) {
          print('✅ 发送方：检测到远程路径，隐藏loading状态: $remotePath');
          setState(() {
            _shouldHideProgressStatus = true;
            _currentRemotePath = remotePath; // 更新远程路径
          });
        }
      }
    }
  }

  void _initImagePaths() {
    // 对于发送方，优先使用构造函数传入的imageBody（发送时的原始路径）
    // 对于接收方，从消息对象中获取
    if (widget.isSentByMe) {
      _currentLocalPath = widget.imageBody.localPath;
      _currentRemotePath = widget.imageBody.remotePath;
      
      // 如果构造函数传入的路径为空，再尝试从消息对象获取
      if ((_currentLocalPath == null || _currentLocalPath!.isEmpty) && 
          widget.message.body is EMImageMessageBody) {
        final body = widget.message.body as EMImageMessageBody;
        _currentLocalPath = body.localPath;
        _currentRemotePath = body.remotePath;
      }
    } else {
      // 接收方：优先使用消息体中的路径
      final body = widget.message.body;
      if (body is EMImageMessageBody) {
        _currentLocalPath = body.localPath;
        _currentRemotePath = body.remotePath;
      } else {
        // 备用：使用构造函数传入的imageBody
        _currentLocalPath = widget.imageBody.localPath;
        _currentRemotePath = widget.imageBody.remotePath;
      }
    }
    
    print('📸 图片路径初始化:');
    print('   本地路径: $_currentLocalPath');
    print('   远程路径: $_currentRemotePath');
    print('   是否发送方: ${widget.isSentByMe}');
  }

  Future<void> _checkAndDownloadImage() async {
    // 发送方不需要下载
    if (widget.isSentByMe) return;

    // 如果已经有本地文件，检查是否有效
    if (_currentLocalPath != null && _currentLocalPath!.isNotEmpty) {
      final file = File(_currentLocalPath!);
      if (await file.exists()) {
        final size = await file.length();
        if (size > 1024) { // 文件至少1KB才认为有效
          print('✅ 本地图片已存在且有效: $_currentLocalPath, 大小: ${size/1024}KB');
          return;
        } else {
          print('⚠️ 本地图片文件太小或无效: $_currentLocalPath, 大小: $size bytes');
        }
      } else {
        print('⚠️ 本地图片文件不存在: $_currentLocalPath');
      }
    }

    // 需要下载图片
    if (_currentRemotePath != null && _currentRemotePath!.isNotEmpty) {
      if (!_isDownloading) {
        await _downloadImage();
      }
    } else {
      print('❌ 没有可用的远程图片路径');
      setState(() {
        _hasError = true;
      });
    }
  }

  Future<void> _downloadImage() async {
    if (_isDownloading) return;
    
    setState(() {
      _isDownloading = true;
      _hasError = false;
    });

    try {
      print('📥 开始下载图片消息: ${widget.message.msgId}');
      
      // 使用环信SDK下载图片（downloadAttachment 返回 void）
      await EMClient.getInstance.chatManager
          .downloadAttachment(widget.message);
      
      // 等待一小段时间，确保文件写入完成
      await Future.delayed(Duration(milliseconds: 300));
      
      // 下载后，从消息对象获取新的本地路径（下载后会自动更新 body 中的路径）
      final body = widget.message.body;
      if (body is EMImageMessageBody) {
        setState(() {
          _currentLocalPath = body.localPath;
          _currentRemotePath = body.remotePath;
        });
        
        print('✅ 图片下载完成: $_currentLocalPath');
        
        // 验证文件
        if (_currentLocalPath != null && _currentLocalPath!.isNotEmpty) {
          final file = File(_currentLocalPath!);
          if (await file.exists()) {
            final size = await file.length();
            print('✅ 文件验证成功，大小: ${size/1024}KB');
          } else {
            print('⚠️ 下载后文件不存在: $_currentLocalPath');
            setState(() {
              _hasError = true;
            });
          }
        } else {
          print('⚠️ 下载后本地路径为空');
          setState(() {
            _hasError = true;
          });
        }
      } else {
        print('❌ 消息体类型错误: ${body.runtimeType}');
        setState(() {
          _hasError = true;
        });
      }
    } catch (e) {
      print('❌ 下载图片失败: $e');
      SmartDialog.showToast('图片下载失败');
      setState(() {
        _hasError = true;
      });
    } finally {
      if (mounted) {
        setState(() {
          _isDownloading = false;
        });
      }
    }
  }

  void _retryDownload() {
    if (!_isDownloading) {
      _downloadImage();
    }
  }

  @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) {
              // 计算图片尺寸
              double maxWidth = 180.w;
              double width = maxWidth;
              double height = width * (304 / 289);
              final imageHeight = height + 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),
                  
                  // 发送消息的状态
                  if (widget.isSentByMe)
                    SizedBox(
                      height: imageHeight,
                      child: Center(
                        child: _buildMessageStatus(),
                      ),
                    ),
                  if (widget.isSentByMe) SizedBox(width: 10.w),
                  
                  // 图片容器
                  GestureDetector(
                    onTap: _onImageTap,
                    child: Container(
                      margin: EdgeInsets.only(top: 10.h),
                      decoration: BoxDecoration(
                        color: widget.isSentByMe ? Color(0xff8E7BF6) : Colors.white,
                        borderRadius: BorderRadius.circular(18.w),
                      ),
                      child: ClipRRect(
                        borderRadius: BorderRadius.circular(18.w),
                        child: _buildImageContent(width, height),
                      ),
                    ),
                  ),
                  
                  if (widget.isSentByMe) SizedBox(width: 8.w),
                  if (widget.isSentByMe) _buildAvatar(),
                ],
              );
            },
          ),
        ),
      ],
    );
  }

  // 构建图片内容
  Widget _buildImageContent(double width, double height) {
    // 发送方和接收方的逻辑不同
    if (widget.isSentByMe) {
      // 发送方：优先显示本地图片（发送时的原始路径）
      return _buildSenderImage(width, height);
    }
    
    // 接收方逻辑
    // 如果有错误且正在下载
    if (_hasError && !_isDownloading) {
      return _buildErrorState(width, height);
    }
    
    // 如果正在下载
    if (_isDownloading) {
      return _buildDownloadingState(width, height);
    }
    
    // 优先显示本地图片
    if (_currentLocalPath != null && _currentLocalPath!.isNotEmpty) {
      return _buildLocalImage(width, height);
    }
    
    // 显示远程图片
    if (_currentRemotePath != null && _currentRemotePath!.isNotEmpty) {
      return _buildNetworkImage(width, height);
    }
    
    // 默认显示错误状态
    return _buildErrorState(width, height);
  }

  // 发送方构建图片
  Widget _buildSenderImage(double width, double height) {
    // 1. 优先尝试构造函数传入的本地路径（发送时的原始路径）
    if (widget.imageBody.localPath.isNotEmpty) {
      final file = File(widget.imageBody.localPath);
      if (file.existsSync()) {
        print('✅ 发送方使用原始本地路径: ${widget.imageBody.localPath}');
        return Image.file(
          file,
          width: width,
          height: height,
          fit: BoxFit.cover,
          errorBuilder: (context, error, stackTrace) {
            print('❌ 发送方加载本地图片失败: $error');
            // 如果构造函数路径失败，返回占位符
            return _buildSenderPlaceholder(width, height);
          },
        );
      } else {
        print('⚠️ 发送方原始本地路径文件不存在: ${widget.imageBody.localPath}');
      }
    }
    
    // 2. 尝试当前本地路径（可能是从消息对象获取的）
    if (_currentLocalPath != null && _currentLocalPath!.isNotEmpty) {
      final file = File(_currentLocalPath!);
      if (file.existsSync()) {
        print('✅ 发送方使用当前本地路径: $_currentLocalPath');
        return Image.file(
          file,
          width: width,
          height: height,
          fit: BoxFit.cover,
          errorBuilder: (context, error, stackTrace) {
            print('❌ 发送方加载当前本地图片失败: $error');
            return _buildSenderPlaceholder(width, height);
          },
        );
      } else {
        print('⚠️ 发送方当前本地路径文件不存在: $_currentLocalPath');
      }
    }
    
    // 3. 如果有远程路径，显示远程图片（但不要一直loading）
    if (_currentRemotePath != null && _currentRemotePath!.isNotEmpty) {
      print('🌐 发送方使用远程路径: $_currentRemotePath');
      // 对于发送方，如果已经超时隐藏了loading状态，网络图片加载失败时也显示占位符而不是一直loading
      return Image.network(
        _currentRemotePath!,
        width: width,
        height: height,
        fit: BoxFit.cover,
        loadingBuilder: (context, child, loadingProgress) {
          if (loadingProgress == null) {
            print('✅ 发送方网络图片加载完成');
            return child;
          }
          // 如果已经超时隐藏了loading状态，不显示网络加载的loading
          if (_shouldHideProgressStatus) {
            print('⏭️ 发送方：已超时，跳过网络图片loading状态');
            return _buildSenderPlaceholder(width, height);
          }
          // 只在真正加载时显示loading，但设置超时
          return _buildLoadingState(width, height);
        },
        errorBuilder: (context, error, stackTrace) {
          print('❌ 发送方加载网络图片失败: $error');
          // 如果所有方法都失败，显示占位符而不是错误状态
          return _buildSenderPlaceholder(width, height);
        },
      );
    }
    
    // 4. 所有方法都失败，显示占位符
    print('⚠️ 发送方：所有路径都不可用，显示占位符');
    return _buildSenderPlaceholder(width, height);
  }

  // 发送方占位符（避免显示错误状态，因为消息已发送成功）
  Widget _buildSenderPlaceholder(double width, double height) {
    return Container(
      width: width,
      height: height,
      decoration: BoxDecoration(
        borderRadius: BorderRadius.circular(18.w),
        color: Color(0xff8E7BF6).withOpacity(0.1),
      ),
      child: Center(
        child: Icon(
          Icons.image,
          size: 32.w,
          color: Color(0xff8E7BF6).withOpacity(0.5),
        ),
      ),
    );
  }

  // 构建本地图片
  Widget _buildLocalImage(double width, double height) {
    try {
      final file = File(_currentLocalPath!);
      if (file.existsSync()) {
        return Image.file(
          file,
          width: width,
          height: height,
          fit: BoxFit.cover,
          errorBuilder: (context, error, stackTrace) {
            print('❌ 加载本地图片失败: $error');
            return _buildErrorState(width, height);
          },
        );
      } else {
        print('❌ 本地图片文件不存在: $_currentLocalPath');
        return _buildErrorState(width, height);
      }
    } catch (e) {
      print('❌ 加载本地图片异常: $e');
      return _buildErrorState(width, height);
    }
  }

  // 构建网络图片
  Widget _buildNetworkImage(double width, double height) {
    return Image.network(
      _currentRemotePath!,
      width: width,
      height: height,
      fit: BoxFit.cover,
      loadingBuilder: (context, child, loadingProgress) {
        if (loadingProgress == null) return child;
        return _buildLoadingState(width, height);
      },
      errorBuilder: (context, error, stackTrace) {
        print('❌ 加载网络图片失败: $error');
        return _buildErrorState(width, height);
      },
    );
  }

  // 构建加载状态
  Widget _buildLoadingState(double width, double height) {
    return Container(
      width: width,
      height: height,
      decoration: BoxDecoration(
        borderRadius: BorderRadius.circular(18.w),
        color: Colors.grey[200],
      ),
      child: Center(
        child: CircularProgressIndicator(
          strokeWidth: 2.w,
          valueColor: AlwaysStoppedAnimation<Color>(Colors.grey[400]!),
        ),
      ),
    );
  }

  // 构建下载中状态
  Widget _buildDownloadingState(double width, double height) {
    return Container(
      width: width,
      height: height,
      decoration: BoxDecoration(
        borderRadius: BorderRadius.circular(18.w),
        color: Colors.grey[200],
      ),
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          CircularProgressIndicator(
            strokeWidth: 2.w,
            valueColor: AlwaysStoppedAnimation<Color>(Color(0xff8E7BF6)),
          ),
          SizedBox(height: 8.h),
          Text(
            '下载中...',
            style: TextStyle(
              fontSize: 12.sp,
              color: Colors.grey[600],
            ),
          ),
        ],
      ),
    );
  }

  // 构建错误状态
  Widget _buildErrorState(double width, double height) {
    return Container(
      width: width,
      height: height,
      decoration: BoxDecoration(
        borderRadius: BorderRadius.circular(18.w),
        color: Colors.grey[200],
      ),
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          Icon(
            Icons.broken_image,
            size: 32.w,
            color: Colors.grey[400],
          ),
          SizedBox(height: 8.h),
          Text(
            '图片加载失败',
            style: TextStyle(
              fontSize: 12.sp,
              color: Colors.grey[600],
            ),
          ),
          if (!widget.isSentByMe && _hasError)
            Padding(
              padding: EdgeInsets.only(top: 8.h),
              child: ElevatedButton(
                onPressed: _retryDownload,
                style: ElevatedButton.styleFrom(
                  padding: EdgeInsets.symmetric(horizontal: 12.w, vertical: 4.h),
                  backgroundColor: Color(0xff8E7BF6),
                  shape: RoundedRectangleBorder(
                    borderRadius: BorderRadius.circular(8.w),
                  ),
                ),
                child: Text(
                  '重新加载',
                  style: TextStyle(
                    fontSize: 10.sp,
                    color: Colors.white,
                  ),
                ),
              ),
            ),
        ],
      ),
    );
  }

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

  // 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
  Widget _buildMessageStatus() {
    if (!widget.isSentByMe) return SizedBox.shrink();

    final status = widget.message.status;
    
    if (status == MessageStatus.FAIL) {
      return GestureDetector(
        onTap: widget.onResend,
        child: Container(
          width: 44.w,
          height: 26.h,
          decoration: BoxDecoration(
            color: Color.fromRGBO(248, 85, 66, 1),
            borderRadius: BorderRadius.circular(8.w),
          ),
          child: Center(
            child: Text(
              '重发',
              style: TextStyle(
                fontSize: 12.sp,
                color: Colors.white,
              ),
            ),
          ),
        ),
      );
    } else if (status == MessageStatus.PROGRESS) {
      // 如果应该隐藏PROGRESS状态（已超时且有远程路径），不显示loading
      if (_shouldHideProgressStatus) {
        return SizedBox.shrink();
      }
      return Container(
        width: 16.w,
        height: 16.w,
        child: CircularProgressIndicator(
          strokeWidth: 2,
          valueColor: AlwaysStoppedAnimation<Color>(Colors.grey),
        ),
      );
    } else {
      return SizedBox.shrink();
    }
  }

  // 点击图片事件
  void _onImageTap() {
    // 检查是否有可显示的图片
    bool hasImage = false;
    String? imagePath;
    String? imageUrl;
    
    // 优先使用本地图片
    if (_currentLocalPath != null && _currentLocalPath!.isNotEmpty) {
      final file = File(_currentLocalPath!);
      if (file.existsSync()) {
        imagePath = _currentLocalPath;
        hasImage = true;
      }
    }
    
    // 如果没有本地图片，使用远程图片
    if (!hasImage && _currentRemotePath != null && _currentRemotePath!.isNotEmpty) {
      imageUrl = _currentRemotePath;
      hasImage = true;
    }
    
    if (hasImage) {
      Get.to(
        () => ImageViewerPage(
          imagePath: imagePath,
          imageUrl: imageUrl,
        ),
        transition: Transition.fade,
        duration: const Duration(milliseconds: 300),
      );
    } else {
      SmartDialog.showToast('图片暂时无法查看');
    }
  }
}