import 'dart:io';
import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';
import 'package:qhd_prevention/tools/h_colors.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 }

/// 横向一行最多四个媒体的添加组件，支持拍摄和全屏相册多选
/// 使用示例：
/// MediaPickerRow(
///   maxCount: 4,
///   mediaType: MediaType.video,
///   onChanged: (List<File> medias) {
///     // medias 列表更新
///   },
/// ),
class MediaPickerRow extends StatefulWidget {
  final int maxCount;
  final MediaType mediaType;
  final ValueChanged<List<File>> onChanged;

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

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

class _MediaPickerRowState extends State<MediaPickerRow> {
  final ImagePicker _picker = ImagePicker();
  final List<File> _files = [];

  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 (_files.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) {
        setState(() {
          _files.add(File(picked!.path));
        });
        widget.onChanged(_files);
      }
    } catch (e) {
      debugPrint('拍摄失败: \$e');
    }
  }

  Future<void> _pickGallery() async {
    if (_files.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 - _files.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 (_files.length >= widget.maxCount) break;
          final file = await asset.file;
          if (file != null) {
            _files.add(file);
          }
        }
        setState(() {});
        widget.onChanged(_files);
      }
    } catch (e) {
      debugPrint('相册选择失败: \$e');
    }
  }

  void _removeFile(int index) {
    setState(() {
      _files.removeAt(index);
    });
    widget.onChanged(_files);
  }

  @override
  Widget build(BuildContext context) {
    return SizedBox(
      height: 80,
      child: ListView.separated(
        scrollDirection: Axis.horizontal,
        itemCount:
            _files.length < widget.maxCount
                ? _files.length + 1
                : widget.maxCount,
        separatorBuilder: (_, __) => const SizedBox(width: 8),
        itemBuilder: (context, index) {
          if (index < _files.length) {
            return Stack(
              children: [
                ClipRRect(
                  borderRadius: BorderRadius.circular(5),
                  child:
                      widget.mediaType == MediaType.image
                          ? Image.file(
                            _files[index],
                            width: 80,
                            height: 80,
                            fit: BoxFit.cover,
                          )
                          : Container(
                            width: 80,
                            height: 80,
                            color: Colors.black12,
                            child: const Center(
                              child: Icon(
                                Icons.videocam,
                                color: Colors.white70,
                              ),
                            ),
                          ),
                ),
                Positioned(
                  top: -6,
                  right: -6,
                  child: IconButton(
                    icon: const Icon(Icons.cancel, size: 20, color: Colors.red),
                    onPressed: () => _removeFile(index),
                  ),
                ),
              ],
            );
          } else {
            return GestureDetector(
              onTap: _showPickerOptions,
              child: Container(
                width: 80,
                height: 80,
                decoration: BoxDecoration(
                  border: Border.all(color: Colors.black12),
                  borderRadius: BorderRadius.circular(5),
                ),
                child: Center(
                  child: Icon(
                    widget.mediaType == MediaType.image
                        ? Icons.camera_alt
                        : Icons.videocam,
                    color: Colors.black26,
                  ),
                ),
              ),
            );
          }
        },
      ),
    );
  }
}

/// 整改后照片上传区域组件
class RepairedPhotoSection extends StatelessWidget {
  final int maxCount;
  final MediaType mediaType;
  final String title;
  final ValueChanged<List<File>> onChanged;
  final VoidCallback onAiIdentify;
  final bool isShowAI;
  final double horizontalPadding;

  const RepairedPhotoSection({
    Key? key,
    this.maxCount = 4,
    this.mediaType = MediaType.image,
    required this.title,
    this.isShowAI = false,
    required this.onChanged,
    required this.onAiIdentify,
    this.horizontalPadding = 10,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Container(
      color: Colors.white,
      padding: const EdgeInsets.only(left: 5, right: 10),
      child: Column(
        children: [
          Padding(
            padding: EdgeInsets.symmetric(horizontal: horizontalPadding),
            child: ListItemFactory.createRowSpaceBetweenItem(
              leftText: title,
              rightText: '0/$maxCount',
            ),
          ),
          Padding(
            padding: EdgeInsets.symmetric(horizontal: horizontalPadding),
            child: MediaPickerRow(
              maxCount: maxCount,
              mediaType: mediaType,
              onChanged: onChanged,
            ),
          ),
          const SizedBox(height: 20),
          if (isShowAI)
            Row(
              children: [
                GestureDetector(
                  onTap: onAiIdentify,
                  child: Container(
                    padding: const EdgeInsets.symmetric(horizontal: 15),
                    height: 36,
                    decoration: BoxDecoration(
                      color: const Color(0xFFDFEAFF),
                      borderRadius: BorderRadius.circular(18),
                    ),
                    child: Row(
                      children: [
                        Image.asset('assets/images/ai_img.png', width: 20),
                        const SizedBox(width: 5),
                        const Text('AI隐患识别与处理'),
                      ],
                    ),
                  ),
                ),
              ],
            ),
        ],
      ),
    );
  }
}