import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:qhd_prevention/customWidget/search_bar_widget.dart';
import 'package:qhd_prevention/http/ApiService.dart';


// 数据模型
class CategoryTypeThree {
  final String id;
  final String name;
  final String pdId;
  final List<CategoryTypeThree> children;

  CategoryTypeThree({
    required this.id,
    required this.name,
    required this.pdId,
    this.children = const [],
  });

  factory CategoryTypeThree.fromJson(Map<String, dynamic> json) {
    return CategoryTypeThree(
      id: json['dataId'] != null ? json['dataId'].toString() : "",
      name: json['dataName'] != null ? json['dataName'].toString() : "",
      pdId: json['parentId'] != null ? json['parentId'].toString() : "",
      children: _parseChildren(json['children']),
    );
  }

  static List<CategoryTypeThree> _parseChildren(dynamic childrenData) {
    if (childrenData == null) return [];
    if (childrenData is! List) return [];

    return childrenData
        .whereType<Map<String, dynamic>>()
        .map((e) => CategoryTypeThree.fromJson(e))
        .toList();
  }

}



/// 弹窗回调签名：返回选中项的 id 和 name
typedef DeptSelectCallback = void Function(String id, String name,String pdId);

class DepartmentPickerThree extends StatefulWidget {
  /// 回调，返回选中部门 id 与 name
  final DeptSelectCallback onSelected;
  final listdata;

  const DepartmentPickerThree({Key? key, required this.onSelected, required this.listdata}) : super(key: key);

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

class _DepartmentPickerThreeState extends State<DepartmentPickerThree> {
  String selectedId = '';
  String selectedPDId = '';
  String selectedName = '';
  Set<String> expandedSet = {};

  List<CategoryTypeThree> original = [];
  List<CategoryTypeThree> filtered = [];
  bool loading = true;

  final TextEditingController _searchController = TextEditingController();

  @override
  void initState() {
    super.initState();
    // 初始均为空
    selectedId = '';
    selectedName = '';
    selectedPDId = '';
    expandedSet = {};
    _searchController.addListener(_onSearchChanged);

    original = (widget.listdata as List<dynamic>)
        .whereType<Map<String, dynamic>>()
        .map<CategoryTypeThree>((json) => CategoryTypeThree.fromJson(json)) // 显式指定map的泛型类型
        .toList();
    filtered = original;
    loading = false;

  }

  @override
  void dispose() {
    _searchController.removeListener(_onSearchChanged);
    _searchController.dispose();
    super.dispose();
  }



  void _onSearchChanged() {
    final query = _searchController.text.toLowerCase().trim();
    setState(() {
      filtered = query.isEmpty ? original : _filterCategories(original, query);
    });
  }

  List<CategoryTypeThree> _filterCategories(List<CategoryTypeThree> list, String query) {
    List<CategoryTypeThree> result = [];
    for (var cat in list) {
      final children = _filterCategories(cat.children, query);
      if (cat.name.toLowerCase().contains(query) || children.isNotEmpty) {
        result.add(CategoryTypeThree(id: cat.id, name: cat.name,pdId:cat.pdId, children: children));
      }
    }
    return result;
  }

  Widget _buildRow(CategoryTypeThree cat, int indent) {
    final hasChildren = cat.children.isNotEmpty;
    final isExpanded = expandedSet.contains(cat.id);
    final isSelected = cat.id == selectedId;
    return Column(
      children: [
        InkWell(
          onTap: () {
            setState(() {
              if (hasChildren) {
                isExpanded ? expandedSet.remove(cat.id) : expandedSet.add(cat.id);
                selectedPDId=cat.pdId;
              }else{
                selectedPDId=cat.id;
              }
              selectedId = cat.id;
              selectedName = cat.name;

            });
          },
          child: Container(
            color: Colors.white,
            child: Row(
              children: [
                SizedBox(width: 16.0 * indent),
                SizedBox(
                  width: 24,
                  child: hasChildren
                      ? Icon(isExpanded ? Icons.arrow_drop_down_rounded : Icons.arrow_right_rounded,
                      size: 35, color: Colors.grey[600])
                      : const SizedBox.shrink(),
                ),
                const SizedBox(width: 5),
                Expanded(
                  child: Padding(
                    padding: const EdgeInsets.symmetric(vertical: 12),
                    child: Text(cat.name),
                  ),
                ),
                Padding(
                  padding: const EdgeInsets.symmetric(horizontal: 16),
                  child: Icon(
                    isSelected ? Icons.radio_button_checked : Icons.radio_button_unchecked,
                    color: Colors.blue,
                  ),
                ),
              ],
            ),
          ),
        ),
        if (hasChildren && isExpanded)
          ...cat.children.map((c) => _buildRow(c, indent + 1)),
      ],
    );
  }

  @override
  Widget build(BuildContext context) {
    return Container(
      width: MediaQuery.of(context).size.width,
      height: MediaQuery.of(context).size.height * 0.7,
      color: Colors.white,
      child: Column(
        children: [
          Container(
            color: Colors.white,
            padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
            child: Row(
              children: [
                GestureDetector(
                  onTap: () => Navigator.of(context).pop(),
                  child: const Text('取消', style: TextStyle(fontSize: 16)),
                ),
                Expanded(
                  child: Padding(
                    padding: const EdgeInsets.symmetric(horizontal: 12),
                    child: SearchBarWidget(
                      controller: _searchController,
                      isShowSearchButton: false,
                      onSearch: (keyboard) {

                      },
                    ),
                  ),
                ),
                GestureDetector(
                  onTap: () {
                    Navigator.of(context).pop();
                    widget.onSelected(selectedId, selectedName,selectedPDId);
                  },
                  child: const Text('确定', style: TextStyle(fontSize: 16, color: Colors.blue)),
                ),
              ],
            ),
          ),
          Divider(),
          Expanded(
            child: loading
                ? const Center(child: CircularProgressIndicator())
                : Container(
              color: Colors.white,
              child: ListView.builder(
                itemCount: filtered.length,
                itemBuilder: (ctx, idx) => _buildRow(filtered[idx], 0),
              ),
            ),
          ),
        ],
      ),
    );
  }
}