interface BaseModel {
  _id: string;
  createdAt: string;
  updatedAt: string;
}

export interface Contractor extends BaseModel {
  name: string;
  vatId: string;
  debt: number;
}

export interface Product extends BaseModel {
  name: string;
  description: string;
  price: number;
  quantity: number;
}

export interface Transfer extends BaseModel {
  date: string;
  operation: 'in' | 'out';
  contractorId: string;
  amount: number;
  contractor?: Contractor;
}

export interface Waybill extends BaseModel {
  date: string;
  operation: 'in' | 'out';
  status: 'waiting' | 'executed' | 'cancelled';
  contractorId: string;
  contractor?: Contractor;
  records: {
    productId: string;
    price: number;
    quantity: number;
  }[];
  total: number;
}