class Company {
  final int id;
  final String name;
  final String code;
  const Company({required this.id, required this.name, required this.code});
  factory Company.fromJson(Map<String, dynamic> j) => Company(
    id: j['id'], name: j['name'] ?? '', code: j['code'] ?? '',
  );
}

class Vendor {
  final int id;
  final String name;
  final String code;
  const Vendor({required this.id, required this.name, required this.code});
  factory Vendor.fromJson(Map<String, dynamic> j) => Vendor(
    id: j['id'], name: j['name'] ?? '', code: j['code'] ?? '',
  );
}

class Category {
  final int id;
  final String name;
  final String code;
  const Category({required this.id, required this.name, required this.code});
  factory Category.fromJson(Map<String, dynamic> j) => Category(
    id: j['id'], name: j['name'] ?? '', code: j['code'] ?? '',
  );
}

class AppUser {
  final int id;
  final String username;
  final String role;
  const AppUser({required this.id, required this.username, required this.role});
  factory AppUser.fromJson(Map<String, dynamic> j) => AppUser(
    id: j['id'], username: j['username'] ?? '', role: j['role'] ?? '',
  );
}