elektronika/lib/app/data/apis/category.dart

import 'package:flutter/cupertino.dart';
import '../../app.dart';

class CategoryApi {
  static List<CategoryModel> _categories = [];

  static List<CategoryModel> get categories => [..._categories];

  static void clearCategories() {
    _categories.clear();
  }

  static Future<List<CategoryModel>> getDescendantCategories(Map<String, dynamic> params) async {
    if (_categories.length == 0) {
      try {
        const String path = Constants.BASE_URL + 'descendant-categories';

        final response = await HttpUtil().get(path: path, queryParameters: params);

        for (final json in response['data']) {
          final CategoryModel category = CategoryModel.fromJson(json);
          _categories.add(category);
        }

        return _categories;
      } catch (error) {
        debugPrint('CategoryApi get error: $error ');
        return [];
      }
    }
    return _categories;
  }

  static List<CategoryModel> buildCategoryTree(String newValue) {
    if (categories.isEmpty) return [];

    final List<CategoryModel> list = [];

    buildTree(newValue, _categories, list);

    return list;
  }

  // build category tree recursively
  static void buildTree(String searchKey, List<CategoryModel> sourceList, List<CategoryModel> destinationList) {
    for (final category in sourceList) {
      if (category.name.toLowerCase().contains(searchKey.toLowerCase())) {
        destinationList.add(category);
      } else {
        buildTree(searchKey, category.children, destinationList);
      }
    }
  }
}