import 'dart:io';
import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';
import 'package:wechat_assets_picker/wechat_assets_picker.dart';
import 'package:photo_manager/photo_manager.dart';

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
/// 使用示例：
/// MediaPickerGrid(
///   maxCount: 4,
///   mediaType: MediaType.video,
///   initialMediaPaths: ['https://...', '/local/path.png'],
///   onChanged: (List<File> medias) {},
///   onMediaAdded: (String path) {},
///   onMediaRemoved: (String path) {},
/// ),
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;

  const MediaPickerRow({
    Key? key,
    this.maxCount = 4,
    this.mediaType = MediaType.image,
    this.initialMediaPaths,
    required this.onChanged,
    this.onMediaAdded,
    this.onMediaRemoved,
  }) : super(key: key);

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

class _MediaPickerGridState extends State<MediaPickerRow> {
  final ImagePicker _picker = ImagePicker();
  late List<String> _mediaPaths;

  @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(),
      );
    });
  }

  Future<void> _showPickerOptions() async {
    showModalBottomSheet(
      context: context,
      builder: (_) => SafeArea(
        child: Wrap(
          children: [
            ListTile(
              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(
              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(
              leading: const Icon(Icons.close),
              title: const Text('取消'),
              onTap: () => Navigator.of(context).pop(),
            ),
          ],
        ),
      ),
    );
  }

  Future<void> _pickCamera() async {
    if (_mediaPaths.length >= widget.maxCount) return;
    try {
      XFile? picked;
      if (widget.mediaType == MediaType.image) {
        picked = await _picker.pickImage(source: ImageSource.camera);
      } else {
        picked = await _picker.pickVideo(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);
      }
    } catch (e) {
      debugPrint('拍摄失败: $e');
    }
  }

  Future<void> _pickGallery() async {
    if (_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;
            _mediaPaths.add(path);
            widget.onMediaAdded?.call(path);
          }
        }
        setState(() {});
        widget.onChanged(_mediaPaths.map((p) => File(p)).toList());
      }
    } catch (e) {
      debugPrint('相册选择失败: $e');
    }
  }

  void _removeMedia(int index) {
    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) {
    return GridView.builder(
      shrinkWrap: true,
      physics: const NeverScrollableScrollPhysics(),
      gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(
        crossAxisCount: 4,
        crossAxisSpacing: 8,
        mainAxisSpacing: 8,
        childAspectRatio: 1,
        mainAxisExtent: 80,

      ),
      itemCount: _mediaPaths.length < widget.maxCount
          ? _mediaPaths.length + 1
          : widget.maxCount,
      itemBuilder: (context, index) {
        if (index < _mediaPaths.length) {
          final path = _mediaPaths[index];
          final isNetwork = path.startsWith('http');
          return 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,
                    ),
                  ),
                ),
              ),
              Positioned(
                top: -15,
                right: -10,
                child: IconButton(
                  icon: const Icon(Icons.cancel, size: 20, color: Colors.red),
                  onPressed: () => _removeMedia(index),
                ),
              ),
            ],
          );
        } else {
          return GestureDetector(
            onTap: _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),
              ),
            ),
          );
        }
      },
    );
  }
}

/// 照片上传区域组件，使用纵向四列Grid展示
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 VoidCallback onAiIdentify;
  final bool isShowAI;
  final double horizontalPadding;
  final bool isRequired;
  final bool isShowNum;

  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 = 10,
    this.onMediaAdded,
    this.onMediaRemoved,
    this.isRequired = false,
    this.isShowNum = true,
  }) : 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,
              onChanged: (files) {
                final newPaths = files.map((f) => f.path).toList();
                setState(() {
                  _mediaPaths = newPaths;
                });
                widget.onChanged(files);
              },
              onMediaAdded: widget.onMediaAdded,
              onMediaRemoved: widget.onMediaRemoved,
            ),
          ),
          const SizedBox(height: 20),
          if (widget.isShowAI)
            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'),
                    ],
                  ),
                ),
              ),
            ),
        ],
      ),
    );
  }
}