import 'dart:io';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:image_picker/image_picker.dart';
import 'package:qhd_prevention/tools/VideoConverter.dart';
import 'package:video_compress/video_compress.dart';
import 'package:wechat_assets_picker/wechat_assets_picker.dart';
import 'package:photo_manager/photo_manager.dart';
import 'package:path/path.dart' as p;
import 'ItemWidgetFactory.dart';

/// 媒体选择类型
enum MediaType { image, video }

/// 纵向滚动四列的媒体添加组件，支持拍摄、全屏相册多选，以及初始地址列表展示
/// 新增 isEdit 属性控制编辑状态
class MediaPickerRow extends StatefulWidget {
  final int maxCount;
  final MediaType mediaType;
  final List<String>? initialMediaPaths;
  final ValueChanged<List<File>> onChanged;
  final ValueChanged<String>? onMediaAdded;
  final ValueChanged<String>? onMediaRemoved;
  final ValueChanged<String>? onMediaTapped; // 新增：媒体点击回调
  final bool isEdit; // 新增：控制编辑状态
  final bool isCamera; // 新增：只能拍照

  const MediaPickerRow({
    Key? key,
    this.maxCount = 4,
    this.mediaType = MediaType.image,
    this.initialMediaPaths,
    required this.onChanged,
    this.onMediaAdded,
    this.onMediaRemoved,
    this.onMediaTapped, // 新增
    this.isEdit = true, // 默认可编辑
    this.isCamera = false,
  }) : super(key: key);

  @override
  _MediaPickerGridState createState() => _MediaPickerGridState();
}

class _MediaPickerGridState extends State<MediaPickerRow> {
  final ImagePicker _picker = ImagePicker();
  late List<String> _mediaPaths;
  bool _isProcessing = false; // 转码或处理时显示 loading

  @override
  void initState() {
    super.initState();
    _mediaPaths = widget.initialMediaPaths != null
        ? widget.initialMediaPaths!.take(widget.maxCount).toList()
        : [];
    WidgetsBinding.instance.addPostFrameCallback((_) {
      widget.onChanged(
        _mediaPaths.map((p) => p.startsWith('http') ? File('') : File(p)).toList(),
      );
    });
  }

  // 公共：当得到本地媒体路径时（可能是 mov/avi 等），需要在这里统一处理（转码、入队、回调）
  Future<void> _handlePickedPath(String path) async {
    if (!mounted) return;
    if (path.isEmpty) return;

    try {
      String finalPath = path;

      // 如果是视频并且不是 mp4，则调用 video_compress 转码
      if (widget.mediaType == MediaType.video) {
        final ext = p.extension(path).toLowerCase();
        if (ext != '.mp4') {
          setState(() => _isProcessing = true);
          try {
            final info = await VideoCompress.compressVideo(
              path,
              quality: VideoQuality.MediumQuality,
              deleteOrigin: false,
            );
            if (info != null && info.file != null) {
              finalPath = info.file!.path;
              debugPrint('✅ 转换完成: $path -> $finalPath');
            } else {
              throw Exception("转码失败: 返回空文件");
            }
          } catch (e) {
            debugPrint('❌ 视频转码失败: $e');
            if (mounted) {
              ScaffoldMessenger.of(context).showSnackBar(
                SnackBar(content: Text('视频转码失败: ${e.toString()}')),
              );
            }
            return;
          } finally {
            if (mounted) setState(() => _isProcessing = false);
          }
        }
      }

      // 添加到列表
      if (_mediaPaths.length < widget.maxCount) {
        setState(() => _mediaPaths.add(finalPath));
        widget.onChanged(_mediaPaths.map((p) => File(p)).toList());
        widget.onMediaAdded?.call(finalPath);
      }
    } catch (e) {
      debugPrint('处理选中媒体失败: $e');
    }
  }

  Future<void> _cameraAction() async {
    if (!widget.isEdit || _mediaPaths.length >= widget.maxCount) return;

    try {
      if (widget.mediaType == MediaType.image) {
        XFile? picked = await _picker.pickImage(source: ImageSource.camera);
        if (picked != null) {
          final path = picked.path;
          setState(() => _mediaPaths.add(path));
          widget.onChanged(_mediaPaths.map((p) => File(p)).toList());
          widget.onMediaAdded?.call(path);
        }
      } else {
        // video from camera
        XFile? picked = await _picker.pickVideo(source: ImageSource.camera);
        if (picked != null) {
          await _handlePickedPath(picked.path);
        }
      }
    } catch (e) {
      debugPrint('拍摄失败: $e');
    }
  }

  Future<void> _showPickerOptions() async {
    if (!widget.isEdit) return; // 不可编辑时直接返回

    showModalBottomSheet(
      context: context,
      backgroundColor: Colors.white,
      builder: (_) => SafeArea(
        child: Wrap(
          children: [
            ListTile(
              titleAlignment: ListTileTitleAlignment.center,
              leading: Icon(
                widget.mediaType == MediaType.image ? Icons.camera_alt : Icons.videocam,
              ),
              title: Text(widget.mediaType == MediaType.image ? '拍照' : '拍摄视频'),
              onTap: () {
                Navigator.of(context).pop();
                _pickCamera();
              },
            ),
            ListTile(
              titleAlignment: ListTileTitleAlignment.center,
              leading: Icon(
                widget.mediaType == MediaType.image ? Icons.photo_library : Icons.video_library,
              ),
              title: Text(widget.mediaType == MediaType.image ? '从相册选择' : '从相册选择视频'),
              onTap: () {
                Navigator.of(context).pop();
                _pickGallery();
              },
            ),
            ListTile(
              titleAlignment: ListTileTitleAlignment.center,
              leading: const Icon(Icons.close),
              title: const Text('取消'),
              onTap: () => Navigator.of(context).pop(),
            ),
          ],
        ),
      ),
    );
  }

  Future<void> _pickCamera() async {
    if (!widget.isEdit || _mediaPaths.length >= widget.maxCount) return;

    try {
      XFile? picked;
      if (widget.mediaType == MediaType.image) {
        picked = await _picker.pickImage(source: ImageSource.camera);
        if (picked != null) {
          final path = picked.path;
          setState(() => _mediaPaths.add(path));
          widget.onChanged(_mediaPaths.map((p) => File(p)).toList());
          widget.onMediaAdded?.call(path);
        }
      } else {
        picked = await _picker.pickVideo(source: ImageSource.camera);
        if (picked != null) {
          await _handlePickedPath(picked.path);
        }
      }
    } catch (e) {
      debugPrint('拍摄失败: $e');
    }
  }

  Future<void> _pickGallery() async {
    if (!widget.isEdit || _mediaPaths.length >= widget.maxCount) return;

    final permission = await PhotoManager.requestPermissionExtend();
    if (permission != PermissionState.authorized &&
        permission != PermissionState.limited) {
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(content: Text('请到设置中开启相册访问权限')),
      );
      return;
    }
    try {
      final remaining = widget.maxCount - _mediaPaths.length;
      final List<AssetEntity>? assets = await AssetPicker.pickAssets(
        context,
        pickerConfig: AssetPickerConfig(
          requestType: widget.mediaType == MediaType.image ? RequestType.image : RequestType.video,
          maxAssets: remaining,
          gridCount: 4,
        ),
      );
      if (assets != null) {
        for (final asset in assets) {
          if (_mediaPaths.length >= widget.maxCount) break;
          final file = await asset.file;
          if (file != null) {
            final path = file.path;
            // 交给统一处理（会转码视频）
            await _handlePickedPath(path);
          }
        }
        setState(() {});
        widget.onChanged(_mediaPaths.map((p) => File(p)).toList());
      }
    } catch (e) {
      debugPrint('相册选择失败: $e');
    }
  }

  void _removeMedia(int index) {
    if (!widget.isEdit) return; // 不可编辑时不允许删除

    final removed = _mediaPaths[index];
    setState(() => _mediaPaths.removeAt(index));
    widget.onChanged(_mediaPaths.map((p) => File(p)).toList());
    widget.onMediaRemoved?.call(removed);
  }

  @override
  Widget build(BuildContext context) {
    final showAddButton = widget.isEdit && _mediaPaths.length < widget.maxCount;
    final itemCount = _mediaPaths.length + (showAddButton ? 1 : 0);

    return Stack(
      children: [
        GridView.builder(
          shrinkWrap: true,
          physics: const NeverScrollableScrollPhysics(),
          gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(
            crossAxisCount: 4,
            crossAxisSpacing: 8,
            mainAxisSpacing: 8,
            childAspectRatio: 1,
          ),
          itemCount: itemCount,
          itemBuilder: (context, index) {
            // 显示媒体项
            if (index < _mediaPaths.length) {
              final path = _mediaPaths[index];
              final isNetwork = path.startsWith('http');

              return GestureDetector(
                onTap: () => widget.onMediaTapped?.call(path),
                child: Stack(
                  children: [
                    ClipRRect(
                      borderRadius: BorderRadius.circular(5),
                      child: widget.mediaType == MediaType.image
                          ? (isNetwork
                          ? Image.network(path, fit: BoxFit.cover, width: 80, height: 80)
                          : Image.file(File(path), width: 80, height: 80, fit: BoxFit.cover))
                          : Container(
                        color: Colors.black12,
                        child: const Center(
                          child: Icon(
                            Icons.videocam,
                            color: Colors.white70,
                          ),
                        ),
                      ),
                    ),
                    // 只在可编辑状态下显示删除按钮
                    if (widget.isEdit)
                      Positioned(
                        top: -15,
                        right: -15,
                        child: IconButton(
                          icon: const Icon(Icons.cancel, size: 20, color: Colors.red),
                          onPressed: () => _removeMedia(index),
                        ),
                      ),
                  ],
                ),
              );
            }
            // 显示添加按钮
            else if (showAddButton) {
              return GestureDetector(
                onTap: widget.isCamera ? _cameraAction : _showPickerOptions,
                child: Container(
                  decoration: BoxDecoration(
                    border: Border.all(color: Colors.black12),
                    borderRadius: BorderRadius.circular(5),
                  ),
                  child: const Center(
                    child: Icon(Icons.camera_alt, color: Colors.black26),
                  ),
                ),
              );
            } else {
              return const SizedBox.shrink();
            }
          },
        ),

        // 转码/处理 loading 遮罩
        if (_isProcessing)
          Positioned.fill(
            child: Container(
              color: Colors.transparent,
              child: const Center(
                child: CircularProgressIndicator(),
              ),
            ),
          ),
      ],
    );
  }
}

/// 照片上传区域组件，使用纵向四列Grid展示
/// 新增 isEdit 属性控制编辑状态
class RepairedPhotoSection extends StatefulWidget {
  final int maxCount;
  final MediaType mediaType;
  final String title;
  final List<String>? initialMediaPaths;
  final ValueChanged<List<File>> onChanged;
  final ValueChanged<String>? onMediaAdded;
  final ValueChanged<String>? onMediaRemoved;
  final ValueChanged<String>? onMediaTapped; // 新增：媒体点击回调
  final VoidCallback onAiIdentify;
  final bool isShowAI;
  final double horizontalPadding;
  final bool isRequired;
  final bool isShowNum;
  final bool isEdit; // 新增：控制编辑状态
  final bool isCamera; // 新增：只能拍照

  const RepairedPhotoSection({
    Key? key,
    this.maxCount = 4,
    this.mediaType = MediaType.image,
    required this.title,
    this.initialMediaPaths,
    this.isShowAI = false,
    required this.onChanged,
    required this.onAiIdentify,
    this.horizontalPadding = 5,
    this.onMediaAdded,
    this.onMediaRemoved,
    this.onMediaTapped, // 新增
    this.isRequired = false,
    this.isShowNum = true,
    this.isEdit = true, // 默认可编辑
    this.isCamera = false,
  }) : super(key: key);

  @override
  _RepairedPhotoSectionState createState() => _RepairedPhotoSectionState();
}

class _RepairedPhotoSectionState extends State<RepairedPhotoSection> {
  late List<String> _mediaPaths;

  @override
  void initState() {
    super.initState();
    _mediaPaths = widget.initialMediaPaths?.take(widget.maxCount).toList() ?? [];
    WidgetsBinding.instance.addPostFrameCallback((_) {
      widget.onChanged(_mediaPaths.map((p) => File(p)).toList());
    });
  }

  @override
  Widget build(BuildContext context) {
    return Container(
      color: Colors.white,
      padding: const EdgeInsets.only(left: 0, right: 10),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Padding(
            padding: EdgeInsets.symmetric(horizontal: widget.horizontalPadding),
            child: ListItemFactory.createRowSpaceBetweenItem(
              leftText: widget.title,
              rightText: widget.isShowNum ? '${_mediaPaths.length}/${widget.maxCount}' : '',
              isRequired: widget.isRequired,
            ),
          ),
          const SizedBox(height: 8),
          Padding(
            padding: EdgeInsets.symmetric(horizontal: widget.horizontalPadding),
            child: MediaPickerRow(
              maxCount: widget.maxCount,
              mediaType: widget.mediaType,
              initialMediaPaths: _mediaPaths,
              isCamera: widget.isCamera,
              onChanged: (files) {
                final newPaths = files.map((f) => f.path).toList();
                setState(() {
                  _mediaPaths = newPaths;
                });
                widget.onChanged(files);
              },
              onMediaAdded: widget.onMediaAdded,
              onMediaRemoved: widget.onMediaRemoved,
              onMediaTapped: widget.onMediaTapped, // 传递点击回调
              isEdit: widget.isEdit, // 传递编辑状态
            ),
          ),
          const SizedBox(height: 20),
          if (widget.isShowAI && widget.isEdit) // 只在可编辑状态下显示AI按钮
            Padding(
              padding: EdgeInsets.symmetric(horizontal: widget.horizontalPadding),
              child: GestureDetector(
                onTap: widget.onAiIdentify,
                child: Container(
                  padding: const EdgeInsets.symmetric(horizontal: 15),
                  height: 36,
                  decoration: BoxDecoration(
                    color: const Color(0xFFDFEAFF),
                    borderRadius: BorderRadius.circular(18),
                  ),
                  child: Row(
                    mainAxisSize: MainAxisSize.min,
                    children: [
                      Image.asset('assets/images/ai_img.png', width: 20),
                      const SizedBox(width: 5),
                      const Text('AI隐患识别与处理'),
                    ],
                  ),
                ),
              ),
            ),
        ],
      ),
    );
  }
}